Tektronix Portable Generator CFG280 User Manual

User Manual  
CFG280  
11 MHz Function Generator  
070-8559-03  
 
WARRANTY  
Tektronix warrants that this product will be free from defects in materials and  
workmanship for a period of one (1) year from the date of shipment. If any such product  
proves defective during this warranty period, Tektronix, at its option, either will repair the  
defective product without charge for parts and labor, or will provide a replacement in  
exchange for the defective product.  
In order to obtain service under this warranty, Customer must notify Tektronix of the defect  
before the expiration of the warranty period and make suitable arrangements for the  
performance of service. Customer shall be responsible for packaging and shipping the  
defective product to the service center designated by Tektronix, with shipping charges  
prepaid. Tektronix shall pay for the return of the product to Customer if the shipment is to  
a location within the country in which the Tektronix service center is located. Customer  
shall be responsible for paying all shipping charges, duties, taxes, and any other charges for  
products returned to any other locations.  
This warranty shall not apply to any defect, failure or damage caused by improper use or  
improper or inadequate maintenance and care. Tektronix shall not be obligated to furnish  
service under this warranty a) to repair damage resulting from attempts by personnel other  
than Tektronix representatives to install, repair or service the product; b) to repair damage  
resulting from improper use or connection to incompatible equipment; or c) to service a  
product that has been modified or integrated with other products when the effect of such  
modification or integration increases the time or difficulty of servicing the product.  
THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THIS  
PRODUCT IN LIEU OF ANY OTHER WARRANTIES, EXPRESSED OR  
IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED  
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR  
PURPOSE. TEKTRONIX’ RESPONSIBILITY TO REPAIR OR REPLACE  
DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY  
PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY.  
TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY  
INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES  
IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS  
ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.  
 
 
Table of Contents  
General Safety Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
iii  
Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Preparing the Function Generator for Use . . . . . . . . . . . . . . . . .  
Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
1
2
4
8
Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
TTL Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Internal Sweep . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
External Sweep . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Amplitude Modulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Tone-Burst Generation and  
9
9
10  
11  
12  
Stepped Frequency Multiplication . . . . . . . . . . . . . . . . . . . .  
13  
Appendix A: Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . .  
17  
Appendix B: Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Preparing for Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
23  
23  
23  
24  
Appendix C: Replaceable Parts . . . . . . . . . . . . . . . . . . . . . . .  
Standard Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Optional Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
29  
29  
29  
CFG280 User Manual  
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Table of Contents  
CFG280 User Manual  
ii  
 
General Safety Summary  
Review the following safety precautions to avoid injury and prevent  
damage to this product or any products connected to it.  
Injury Precautions  
Use Proper Power Cord  
To avoid fire hazard, use only the power cord specified for this  
product.  
Avoid Electric Overload  
To avoid electric shock or fire hazard, do not apply a voltage to a  
terminal that is outside the range specified for that terminal.  
Ground the Product  
This product is grounded through the grounding conductor of the  
power cord. To avoid electric shock, the grounding conductor must  
be connected to earth ground. Before making connections to the  
input or output terminals of the product, ensure that the product is  
properly grounded.  
Do Not Operate Without Covers  
To avoid electric shock or fire hazard, do not operate this product  
with covers or panels removed.  
Use Proper Fuse  
To avoid fire hazard, use only the fuse type and rating specified for  
this product.  
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General Safety Summary  
Do Not Operate in Wet/Damp Conditions  
To avoid electric shock, do not operate this product in wet or damp  
conditions.  
Do Not Operate in Explosive Atmosphere  
To avoid injury or fire hazard, do not operate this product in an  
explosive atmosphere.  
Product Damage Precautions  
Use Proper Voltage Setting  
Before applying power, ensure that the line selector is in the proper  
position for the power source being used.  
Provide Proper Ventilation  
To prevent product overheating, provide proper ventilation.  
Do Not Operate With Suspected Failures  
If you suspect there is damage to this product, have it inspected by  
qualified service personnel.  
Safety Terms and Symbols  
Terms in This Manual  
These terms may appear in this manual:  
WARNING. Warning statements identify conditions or practices that  
could result in injury or loss of life.  
CFG280 User Manual  
iv  
 
General Safety Summary  
CAUTION. Caution statements identify conditions or practices that  
could result in damage to this product or other property.  
Terms on the Product  
These terms may appear on the product:  
DANGER indicates an injury hazard immediately accessible as you  
read the marking.  
WARNING indicates an injury hazard not immediately accessible as  
you read the marking.  
CAUTION indicates a hazard to property including the product.  
Symbols on the Product  
The following symbols may appear on the product:  
Double  
Insulated  
DANGER  
High Voltage  
Protective Ground  
(Earth) Terminal  
ATTENTION  
Refer to  
Manual  
Certifications and Compliances  
CSA Certified Power Cords  
CSA Certification includes the products and power cords appropriate  
for use in the North America power network. All other power cords  
supplied are approved for the country of use.  
CFG280 User Manual  
v
 
General Safety Summary  
CFG280 User Manual  
vi  
 
Getting Started  
The Tektronix CFG280 Function Generator produces low distortion  
sine waves, square waves, triangle waves, TTL sync signals, positive  
and negative pulses, and ramp waveforms in a frequency range of  
0.1 Hz to 11 MHz. You can also directly control amplitude and  
DC offset.  
The sweep function makes the output signal traverse a range of  
frequencies. The START and STOP FREQ control settings determine  
the sweep rate and sweep width internally or the sweep function can  
be input from an external DC signal.  
A voltage-controlled frequency (VCF) input controls the output  
frequency from an external voltage source. The output frequency can  
be swept above or below the selected frequency to a maximum of  
100:1, depending on the polarity and amplitude of the VCF input and  
the selected output frequency. Provisions are also made for amplitude  
modulation of the sine wave output from an external source.  
An external gate input allows the generator to operate for the  
duration of an externally applied gating signal. This mode provides  
either a single cycle output or a train of preselected waveforms,  
depending on the gating signal width and the function generator  
frequency setting.  
The CFG280 Function Generator has a frequency counter to count  
the signal frequency of sine, square and triangle waves from 1 Hz to  
100 MHz. The frequency counter features one five-digit display with  
automatic decimal point placement and LED indicators that show the  
display measurement unit and mode. It can measure periods in  
seconds or frequencies in kHz or MHz. The front panel controls also  
provide selectable gate times (resolution) and selectable X10  
attenuation.  
The CFG280 has a locking, multiposition handle that folds under the  
instrument. The instrument comes with a power cord, an installed  
fuse for 115V operation, and this manual.  
CFG280 User Manual  
1
 
Getting Started  
Preparing the Function Generator for Use  
Check the following items prior to operating the CFG280 Function  
Generator for the first time (see Figure 1 for locations of items 1  
through 3):  
2
1
3
Figure 1: Line Voltage Selectors, Power Input, and Fuse Locations  
CAUTION. To prevent damage to the instrument, set the line voltage  
selectors to the proper voltage setting and install the correct line  
voltage fuse before operating the equipment.  
1. Set the line voltage selectors to the input line voltage. These  
selectors connect internal wiring for various line voltages. This  
product is intended to operate from a power source that does not  
supply more than 250 V  
between the supply conductors or  
RMS  
between either supply conductor and ground. For line voltage  
ranges, refer to Appendix A: Specifications on page 17.  
CFG280 User Manual  
2
 
Getting Started  
WARNING. To prevent electrical shock, unplug the power cord and  
disconnect the signal cable from any signal source before checking  
or replacing the fuse.  
2. Check that the correct line fuse is installed. The line fuse  
provides protection if the equipment malfunctions or an overload  
occurs. Refer to Appendix C: Replaceable Parts on page 29 for  
fuse part numbers.  
WARNING. To prevent electrical shock, connect the power cord to a  
properly grounded power source. The outside (ground) of this  
connector is connected through the equipment to the power source  
ground. Do not remove the ground lug from the power cord for any  
reason.  
3. Connect the input power cord. Use only the power cords specified  
for this equipment. Refer to Appendix C: Replaceable Parts on  
page 29 for power cord part numbers.  
CFG280 User Manual  
3
 
Getting Started  
Front Panel  
Figure 2 shows the front-panel controls, connectors, and indicators of  
the CFG280 Function Generator.  
1 2  
3
4
5
6
7
8
9
10 11  
12 13 14  
15  
16  
17  
19  
25  
24  
23  
22  
21  
20  
18  
Figure 2: Front Panel Controls, Connectors, and Indicators  
1. OVERRANGE LED. Lights if you apply a frequency above  
specified limits to the EXT COUNTER INPUT connector. It also  
lights if the gate time is too slow for the incoming signal.  
2. GATE LED. Lights when the frequency counter is making a  
measurement. The LED will blink when the counter updates the  
display.  
3. Counter Readout. This is a five-digit display that shows  
frequency counter measurements. The decimal point is  
automatically placed in the appropriate position, depending on  
the measurement and resolution.  
4. MULTIPLIER LEDs. Indicate the frequency multiplication factor  
of the function generator outputs. The 10-1M LED indicates a  
6
factor from 10 through 10 . You should use the 10-1M LED with  
the counter readout and FREQUENCY Range LEDs.  
CFG280 User Manual  
4
 
Getting Started  
The 1 and 0.1 LEDs provide accurate indication for the two  
lowest frequency ranges. For example, if the FREQUENCY dial  
is set on 2.6 and the 1 LED is lighted, the function generator  
output frequency is 2.6 Hz.  
5. FREQUENCY Range LEDs. Indicate the range (either MHz or  
kHz) of the reading shown on the counter readout. These LEDs  
also indicate the frequency range of the function generator  
output. For example, if the FREQUENCY dial is set on 9, the  
10-1M LED is lighted, the kHz LED is lighted, and the counter  
readout shows .090, then the function generator output frequency  
is 0.090 kHz = 90 Hz.  
NOTE. You must have the SOURCE button set on INT (pushed out) to  
2
3
4
5
6
differentiate between the 10, 10 , 10 (kHz),10 ,10 , and 10 (MHz)  
generator output ranges.  
6. SEC LED. Lights when the frequency counter is in PERIOD  
mode. The counter readout does not show frequency in hertz, but  
period in seconds. For example, if the FREQUENCY dial is set at  
4, the 1 multiplier LED is lighted, and the SEC LED is lighted,  
the counter readout displays a value close to 0.250. This indicates  
the generator output period is .25 s (the frequency is 4 Hz).  
7. MULTIPLIER Buttons. Set the frequency range. The left button  
raises the range by a power of ten and the right button lowers the  
range by a power of ten. For example, if the FREQUENCY dial  
is set to 4.7 and the output is set to kHz, when you press the left  
multiplier button the output frequency will jump from  
3
4
4.7 10 Hz (4.7 kHz) to 4.7 10 Hz (47 kHz).  
8. FUNCTION Buttons. Select the type of waveform generated:  
sine, triangle, or square.  
9. Symmetry Buttons. Select either positive pulse/ramp or negative  
pulse/ramp (see Table 1 on page 6). When you push either  
button in, the output frequency is 1/10 of the value shown on the  
FREQUENCY dial. When you push both buttons in, the output  
frequency is 1/19 of the value shown on the FREQUENCY dial.  
CFG280 User Manual  
5
 
Getting Started  
Table 1: Effect of Symmetry Buttons on Output  
Waveform Left Symmetry Button Right Symmetry Button  
10. SWEEP Button. Activates the internal sweep generator, which  
produces a signal that traverses a range of frequencies. This  
button enables the SWEEP RATE and SWEEP WIDTH knobs.  
You can also feed an external sweep signal into the CFG280  
Function Generator through a connector on the rear panel. See  
External Sweep on page 11 for further details.  
11. SWEEP RATE Knob. Adjusts how often the frequency sweep  
reiterates—the rate at which the signal traverses the frequencies.  
If you pull this button out, the sweep will stop and you can adjust  
the sweep stop frequency with the SWEEP WIDTH knob.  
12. GATE SEL Button. Selects the gate time. If the gate time is too  
slow for the incoming signal, the OVERRANGE LED lights.  
13. ATTN Button. Selects between two levels of input signals for the  
EXT COUNTER INPUT. When you push the button in, the  
CFG280 Function Generator attenuates the incoming signal by a  
factor of ten (the peak-to-peak input level must be between 3 V  
and 42V). When you push the button out, the function generator  
does not attenuate the input signal (the peak-to-peak input level  
must be between 50 mV and 5 V).  
CFG280 User Manual  
6
 
Getting Started  
14. SOURCE Button. Selects between internal and external counter  
input. When you push the button in, the counter readout displays  
the signal frequency count from the EXT COUNTER INPUT.  
When you push the button out the counter readout displays the  
frequency count of the signal being generated by the CFG280  
Function Generator.  
15. MAIN Button. Selects between two voltage ranges: 0 V to  
p-p  
2 V or 0 V to 20 V . This control is used with the  
p-p  
p-p  
p-p  
AMPLITUDE control to set the voltage level of the MAIN OUT  
signal.  
16. AMPLITUDE Knob. Adjusts the voltage within the presently  
selected range. This control is used with the MAIN control to set  
the voltage level of the MAIN OUT signal.  
17. DC OFFSET Knob. Sets the DC level (and therefore the polarity)  
of the MAIN OUT signal. This knob has no effect until you pull  
it out.  
18. SWEEP WIDTH Knob. Adjusts the range of frequencies that are  
traversed by each sweep.  
19. SWEEP OUT BNC. This connector sends sweep signals that you  
can adjust with the sweep controls. You can use a sweep signal to  
synchronize an external device such as an oscilloscope.  
20. MAIN OUT BNC. This connector sends sine, triangle, square,  
and positive and negative pulse/ramp signals.  
21. SYNC OUT BNC. This connector sends TTL trigger signals.  
Amplitude and DC offset adjustments do not affect TTL trigger  
output.  
22. EXT COUNTER INPUT BNC. This connector can accept  
external signals with frequencies between 1 Hz and 100 MHz.  
23. FREQ FINE ADJ knob. Allows small adjustments in output  
frequency.  
24. FREQUENCY Dial. Determines the frequency of the function  
generator output, within the range set by the MULTIPLIER  
buttons.  
25. POWER switch. Toggles instrument power on and off.  
CFG280 User Manual  
7
 
Getting Started  
Rear Panel  
In addition to the line voltage switches, fuse, and power cord  
receptacle, the items shown in Figure 3 are located on the rear panel.  
1
2
3
Figure 3: Rear Panel Connections  
CAUTION. To avoid the risk of fire or damage to theCFG280  
Function Generator, be sure input equipment is properly grounded  
before connecting it to the function generator.  
1. GATE INPUT BNC. This connector accepts external gate signals,  
which you can use in tone-burst generation. See page 13 for  
details.  
2. EXT AM INPUT BNC. This connector accepts external  
amplitude modulation signals. See page 12 for details.  
3. VCF INPUT BNC. This connector accepts external sweep  
signals. See page 11 for details.  
CFG280 User Manual  
8
 
Reference  
This section describes several advanced functions of the CFG280  
Function Generator. The variety of swept and modulated signals  
available from the function generator make it especially useful for  
such applications as testing servo-system or amplifier response,  
distortion, and stability. It can be used for FM generation, frequency  
multiplication, or as a variable, beat-frequency oscillator. It can be  
used to generate repetition rates or tone bursts. The square wave sync  
and sweep outputs can be used as a source for TTL logic or to  
synchronize an external device,such as an oscilloscope. The CFG280  
Function Generator is also useful as a source for amplitude  
modulated signals for various purposes.  
TTL Signals  
To generate a TTL signal, follow these steps:  
1. Connect the SYNC OUT connector on the CFG280 Function  
Generator to the input BNC connector on an oscilloscope (see  
Figure 4) .  
Test oscilloscope  
CFG280  
Figure 4: TTL Signal Test Setup  
2. Observe the results on the oscilloscope. If necessary, change the  
volts per division setting or other controls on the oscilloscope to  
acquire a useful signal.  
CFG280 User Manual  
9
 
Reference  
3. Change the FREQUENCY range and rotate the FREQUENCY  
dial. Observe how the frequency of the TTL signal changes.  
4. Rotate the DC OFFSET knob. Notice that this knob has no effect  
on TTL signals.  
The DC OFFSET knob has no effect because the DC offset of a  
TTL signal is standardized for compliance with TTL logic.  
Signals produced from the SYNC OUT connector are not affected  
by this knob.  
5. Rotate the AMPLITUDE knob. Notice that this knob has no  
effect on TTL signals.  
The AMPLITUDE knob has no effect because the amplitude of a  
TTL signal is standardized for compliance with TTL logic.  
Internal Sweep  
To use the internal sweep function, follow these steps:  
1. Connect the MAIN OUT BNC on the CFG280 Function  
Generator to the device under test, such as a filter (see Figure 5).  
2. Connect the SWEEP OUT connector to one channel of an  
oscilloscope (see Figure 5).  
SWEEPOUT  
Test oscilloscope  
CFG280  
MAIN OUT  
Device  
under test  
Figure 5: Internal Sweep Test Setup  
CFG280 User Manual  
10  
 
Reference  
3. Connect another channel of the oscilloscope to the device under  
test (see Figure 5).  
4. Push the SWEEP button out on the function generator to  
deactivate the internal sweep function.  
5. Turn the FREQUENCY dial to the desired sweep start frequency  
(the lowest point on the sweep).  
6. Push the SWEEP button in to enable the internal sweep function.  
7. Pull the SWEEP RATE knob out to lock the function generator  
at the sweep stop frequency (the highest point on the sweep).  
8. Adjust the sweep stop frequency with the SWEEP WIDTH  
knob.  
9. Now push the SWEEP button in to activate the internal linear  
sweep. Use the SWEEP RATE knob to adjust the sweep rate.  
External Sweep  
To use the external sweep function, follow these steps:  
1. Connect the MAIN OUT connector on the CFG280 Function  
Generator to the oscilloscope input connector (see Figure 6).  
To VCF INPUT  
(on rear panel)  
Voltage source  
Test oscilloscope  
CFC280  
MAIN OUT  
Figure 6: External Sweep Test Setup  
CFG280 User Manual  
11  
 
Reference  
2. Turn the Frequency Dial to the 0.1 position.  
CAUTION. To avoid damage to the CFG280, ensure that the maximum  
voltage into the rear panel VCF INPUT is no more than ±10 V pk.  
3. Connect an external voltage signal to the VCF INPUT on the  
rear panel of the instrument (see Figure 6).  
4. Push the SWEEP button out to deactivate the internal sweep  
function.  
When using an external sweep signal, the SWEEP WIDTH and  
SWEEP RATE knobs have no effect on the signal sweep. Instead,  
these parameters are controlled entirely by the external signal  
provided through the rear panel.  
Amplitude Modulation  
To use the amplitude modulation function, follow these steps.  
1. Connect the MAIN OUT connector on the CFG280 Function  
Generator to the oscilloscope input (see Figure 7).  
To EXT AM INPUT  
(on rear panel)  
Voltage source  
Test oscilloscope  
CFG280  
MAIN OUT  
Figure 7: Amplitude Modulation Test Setup  
CFG280 User Manual  
12  
 
Reference  
2. Push the sine wave FUNCTION button.  
3. Set the FREQUENCY dial to the desired carrier frequency.  
CAUTION. To avoid damage to theCFG280 Function Generator,  
ensure that the maximum voltage into the rear panel VCF INPUT is  
no more than 5 V  
.
p-p  
4. Connect an external voltage signal to the EXT AM INPUT on  
the rear panel of the instrument (see Figure 7).  
5. Control the amplitude modulation by varying the voltage level of  
the external voltage source.  
Tone-Burst Generation and  
Stepped Frequency Multiplication  
You can use the CFG280 Function Generator as a tone-burst  
generator or frequency multiplier for checking tone-controlled  
devices. This application requires another function generator (such as  
the Tektronix CFG253) to serve as a gating signal source and a ramp  
generator to serve as a VCF signal source.  
1. Connect the MAIN OUT connector on the CFG280 Function  
Generator to the oscilloscope input connector (see Figure 8).  
2. Connect the ramp generator output to the VCF INPUT connector  
on the rear of the CFG280 Function Generator (see Figure 8).  
CFG280 User Manual  
13  
 
Reference  
CFG253  
To VCF INPUT (on rear panel)  
To GATE INPUT (on rear panel)  
Ramp  
Generator  
Test oscilloscope  
CFG280  
MAIN OUT  
RAMP  
OUT  
EXT  
IN  
Figure 8: Tone-Burst and Stepped Frequency Multiplication Test Setup  
3. Connect the MAIN OUTPUT of the CFG253 to a BNC T  
connector. Connect the BNC T outputs to the GATE INPUT  
connector on the CFG280 Function Generator and the external  
input on the ramp generator (see Figure 8).  
4. Set the ramp generator to generate the desired ramp duration and  
polarity.  
5. Adjust the CFG253 Function Generator output period to the  
desired number of bursts within the selected ramp duration.  
6. Adjust the CFG253 Function Generator output duration to the  
desired burst width.  
CFG280 User Manual  
14  
 
Reference  
VCF input  
GATE input  
Tone-Burst or stepped  
frequency output  
Figure 9: Tone-Burst and Stepped Frequency Typical Waveforms  
7. Select the sweep frequency range by adjusting the  
FREQUENCY dial to one end of the swept range (upper or  
lower limit, depending on the polarity of the ramp) and adjusting  
the other end with the RG501 output amplitude.  
CFG280 User Manual  
15  
 
Reference  
CFG280 User Manual  
16  
 
Appendix A: Specifications  
Tables 2 through 5 show characteristics of the CFG280 Function  
Generator that are guaranteed by warranty.  
Table 2: Generator Specifications  
Characteristic  
Measurement  
Outputs  
Square wave, sine wave, triangle wave, TTL  
pulse, positive and negative ramp, pulse and  
skewed sine wave, AM, and sweep functions  
Frequency Ranges  
Dial Range  
0.1 Hz to 11 MHz, up/down range switchable in  
eight decade steps  
1 to 11 calibrated  
0.1 to 1 uncalibrated  
Dial Accuracy  
±5% of full scale from 0.1 Hz to 10 MHz  
11 MHz setting not less than 11 MHz  
(ambient temperature 20_ C to 30_ C)  
Pulse and Ramp Frequency 1/10 of dial frequency  
Pulse and Ramp Aspect  
Ratio  
95:5  
Main Output Amplitude  
Two ranges:  
0–20 V  
p–p  
200 mV to 20 V (open circuit)  
p-p  
100 mV to 10 V (50 W load)  
p-p  
0–0.2 V  
p–p  
20 mV to 2 V (open circuit)  
p-p  
10 mV to 1 V (50 W load)  
p-p  
Main Output Impedance  
DC Offset  
50 W ±10%  
<–10 V to >+10 V (open circuit)  
<–5 V to >+5 V (into 50 W load)  
CFG280 User Manual  
17  
 
Appendix A: Specifications  
Table 2: Generator Specifications (Cont.)  
Characteristic  
Measurement  
Amplitude Flatness  
(At 10 kHz, 50 W Load)  
Within ±0.5 dB, 0.1 Hz to 110 kHz  
Within ±1.5 dB, to 1.1 MHz  
Within ±2.5 dB, to 11 MHz  
Sine Wave Distortion  
<1% from 10 Hz to 100 kHz  
–30 dB at all other frequencies  
(ambient temperature 20_ C to 30_ C)  
Triangle Wave Linearity  
0.1 Hz to 100 Hz w 99%  
100 kHz to 1 MHz w 97%  
Measured from 10% to 90% of waveform  
Square Wave Transition  
Time  
v25 ns rise/fall time at maximum output into a  
50 W load  
Square Wave Aberrations  
v4% peak-to-peak at maximum output into a  
50 W load  
Sync TTL Output  
Rise/Fall Time  
<25 ns into 50 W load  
VCF (FM) Input  
A ±10 V signal input shifts frequency w 1000:1 up or  
down with dial set at 0.1 or 11 respectively  
External Gate Input  
w+2 V gate signal required, not to exceed +15 V  
fixed 0 degree start phase  
Internal Sweep Rate  
Internal Sweep Width  
Amplitude Modulation  
Continuously variable from 0.5 to 50 Hz  
Variable from 1:1 to 100:1  
100% with v5 V , DC to 200 kHz  
p-p  
DSB suppressed carrier modulation is also  
obtained by input modulating the signal with  
w +2.5 VDC offset  
Input impedance = 3 kW  
CFG280 User Manual  
18  
 
Appendix A: Specifications  
Table 3: Counter Specifications  
Characteristic  
Input Selection  
Frequency Range  
Measurement  
Internal and external input selectable  
DC to 100 MHz for internal  
1 Hz to 100 MHz, AC coupled for external  
Resolution  
Accuracy  
Frequency mode: 1 Hz, 10 Hz, 1 kHz  
Period mode: 1 ms  
Frequency mode: ±(1 count + time base error)  
Period mode: ±(1 count + time base error  
+ trigger error)  
External Input  
Sensitivity  
30 mV  
RMS  
1 Hz to 50 MHz  
50 mV  
RMS  
50 MHz to 100 MHz  
Impedance  
Attenuation  
1 MW paralleled by 40 pF  
3 V to 42 V (X10)  
50 mV to 5 V (X1)  
42 V peak  
Maximum Input Voltage  
Internal Time Base  
10 MHz  
Crystal Frequency  
Temperature Stability  
Line Voltage Stability  
Aging Rate  
<0.001% (10 ppm from 0_ĂC to 40_ĂC)  
<±1 ppm with 10% line voltage variation  
<±10 ppm/yr  
CFG280 User Manual  
19  
 
Appendix A: Specifications  
Table 4: General Specifications  
Characteristic  
Measurement  
Line Voltage Range  
Selectable ranges at 50 Hz to 60 Hz  
90 VAC to 110 VAC  
108 VAC to 132 VAC  
198 VAC to 242 VAC  
216 VAC to 250 VAC  
Operating Temperature  
+0_ĂC to +40_ĂC, 80% relative humidity  
Nonoperating Temperature  
–10_ĂC to +70_ĂC, 70% relative humidity  
Table 5: Certifications and Compliances  
EC Declaration of  
Conformity – EMC  
Meets intent of Directive 89/336/EEC for Electromagnetic  
Compatibility. Compliance was demonstrated to the following  
specifications as listed in the Official Journal of the European  
Communities:  
EN 55011  
Class A Radiated and Conducted Emissions  
EN 50081-1 Emissions:  
EN 60555-2 AC Power Line Harmonic Emissions  
EN 50082-1 Immunity:  
IEC 801-2  
IEC 801-3  
IEC 801-4  
IEC 801-5  
Electrostatic Discharge Immunity  
RF Electromagnetic Field Immunity  
Electrical Fast Transient/Burst Immunity  
Power Line Surge Immunity  
EC Declaration of  
Conformity – Low  
Voltage  
Compliance was demonstrated to the following specification as  
listed in the Official Journal of the European Communities:  
Low Voltage Directive 73/23/EEC, amended by 93/68/EEC.  
HD401 S1  
Safety Requirements for Electronic  
Measuring Aparatus.  
CFG280 User Manual  
20  
 
Appendix A: Specifications  
Table 6: Typical Mechanical Specifications  
Characteristic  
Measurement  
Dimensions  
(H x W x D)  
100 mm X 240 mm X 230 mm  
(3.9 in x 9.5 in x 9.0 in)  
Weight  
3.0 kg (6.6 lb)  
CFG280 User Manual  
21  
 
Appendix A: Specifications  
CFG280 User Manual  
22  
 
Appendix B: Maintenance  
This appendix provides information for the basic maintenance of the  
CFG280 Function Generator.  
Cleaning  
To clean the CFG280 Function Generator, use a soft cloth dampened  
in a solution of mild detergent and water. Do not spray cleaner  
directly onto the instrument, since it may leak into the cabinet and  
cause damage.  
Do not use chemicals containing benzine, benzene, toluene, xylene,  
acetone, or similar solvents.  
Do not use abrasive cleaners on any portion of the function  
generator.  
Preparing for Shipment  
If the original packaging is unfit for use or not available, use the  
following packaging guidelines:  
1. Use a corrugated cardboard shipping carton having inside  
dimensions at least three inches greater than the instrument  
dimensions.  
2. Put the instrument into a plastic bag or wrap to protect it from  
dampness and loose packing material.  
3. Place the instrument into the box and firmly stabilize it with  
packing material.  
4. Seal the carton with shipping tape.  
CFG280 User Manual  
23  
 
Appendix B: Maintenance  
Troubleshooting  
Use the following diagrams to identify basic problems with your  
instrument setup. The diagrams do not provide instructions for or  
recommend instrument disassembly. If these diagrams fail to solve  
your problem, send your instrument to the nearest Tektronix service  
center.  
NOTE. These diagrams assume that any other test equipment you use  
is operating properly. Before you assume a problem exists with  
theCFG280 Function Generator, check all other test equipment.  
Digital Display Blank  
Start.  
Send your  
Are  
any LEDs  
lighted?  
instrument to the  
nearest Tektronix  
service center.  
Yes  
No  
Is  
Is  
power cord  
Yes  
Adjust with rear  
panel switches.  
No  
instrument line  
voltage setting  
correct?  
firmly connected to both  
instrument and power  
source?  
Yes  
No  
Ensure good  
power cord  
connection at  
both ends.  
Is the  
Replace with  
proper fuse (see  
Selecting the  
Fuse).  
fuse appropriate  
for current line voltage and  
operational?  
No  
Yes  
Send your  
instrument to the  
nearest Tektronix  
service center.  
CFG280 User Manual  
24  
 
Appendix B: Maintenance  
Inappropriate Counter Reading  
Start.  
Are  
function, gate,  
Change settings to  
accommodate the  
input signal.  
Is the  
digital display  
frozen?  
No  
and attenuation  
settings appropriate for the  
input  
No  
signal?  
Yes  
Yes  
Send your instrument to  
the nearest Tektronix  
service center.  
Are  
Toggle the  
SOURCE button.  
you using the  
external input  
connector?  
No  
Yes  
Check connection and  
voltage level of signal.  
CFG280 User Manual  
25  
 
Appendix B: Maintenance  
No Function Generator Output  
Start.  
Go to  
Is the  
digital display  
blank?  
Digital Display  
Blank on page  
24.  
Yes  
No  
Does  
Ensure good  
electrical  
connection to  
output jack.  
oscilloscope have good  
connection to output jack?  
No  
Yes  
Are  
Adjust with  
AMPLITUDE  
knob and MAIN  
button.  
Yes  
amplitude settings too  
low to produce visible  
signal?  
No  
Push appropriate  
MULTIPLIER and  
FUNCTION  
Are  
No  
range and function  
selected?  
buttons.  
Yes  
Send your instrument to the  
nearest Tektronix service  
center.  
CFG280 User Manual  
26  
 
Appendix B: Maintenance  
Inappropriate Function Generator Output  
Start.  
Is signal  
amplitude too  
large or too  
small?  
Yes  
Yes  
Adjust with AMPLITUDE knob and MAIN  
button.  
No  
Is signal  
frequency too fast  
or slow?  
Adjust with MULTIPLIER  
buttons and FREQUENCY dial.  
Push in SWEEP  
button to activate  
internal sweep.  
No  
No  
Are  
Is  
SWEEP button  
pushed  
Internal  
Is signal responsive to  
sweep rate and sweep  
width adjustments?  
No  
you using internal or  
external  
sweep?  
in?  
Yes  
External  
Sweep knobs do not  
function in external  
sweep mode.  
Send your  
instrument to the  
nearest Tektronix  
service center.  
Yes  
Is signal  
responsive to DC  
offset  
Is  
Pull DC OFFSET knob  
out to activate DC offset  
function.  
No  
No  
DC OFFSET knob  
pulled out?  
adjustments?  
Yes  
Send your instrument to the  
nearest Tektronix service  
center.  
Done.  
CFG280 User Manual  
27  
 
Appendix B: Maintenance  
CFG280 User Manual  
28  
 
Appendix C: Replaceable Parts  
Replaceable parts may be ordered directly from your authorized  
Tektronix dealer.  
Standard Accessories  
The following items are shipped with the CFG280 Function  
Generator:  
Table 7: Standard Accessories  
Accessory  
Tektronix Part Number  
Fuse, 3AG, 0.6 A, 250 V, SB  
(90 – 132 V operation)  
159–0043–00  
CFG280 User Manual  
115 V Power Cord  
070–8559–XX  
Refer to Table 9  
Optional Accessories  
The following items are available as optional accessories:  
Table 8: Optional Accessories  
Accessory  
Tektronix Part Number  
Fuse, 3AG, 0.3 A, 250 V, SB  
(198 – 250 V operation)  
159–0029–00  
230 V Power Cords  
Refer to Table 9  
012–1341–XX  
103–0275–XX  
36-inch, 50 W BNC cable  
66-inch, 50ĂW coaxial cable signal  
adapter  
CFG280 User Manual  
29  
 
Appendix C: Replaceable Parts  
The following power cords are available.  
Table 9: Accessory Power Cords  
Tektronix Part  
Number  
Plug Configuration  
Normal Usage  
North America  
115 V  
161-0104-00  
Europe  
230 V  
161-0104-06  
United Kingdom  
230 V  
161-0104-07  
161-0104-05  
Australia  
230 V  
North America  
230 V  
161-0104-08  
161-0167-00  
Switzerland  
230 V  
CFG280 User Manual  
30  
 

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