3-14
Testing Performance
To verify bandwidth
1
Connect the oscilloscope calibrator output to the oscilloscope channel
1 input.
2 Set up the oscilloscope.
a Set channel 1 Coupling to DC and Imped to 50 Ohm.
b Set the time base to 500 ns/div.
c Set the Volts/Div for channel 1 to 200 mV/div.
d Press the Acquire key, then press the Averaging softkey.
e Turn the Entry knob to set #Avgs to 8 averages.
3
Set the calibrator to “Level Sine” and OPR/STBY to “OPR”.
4 Set the calibrator for 1 MHz and six divisions of amplitude.
5 Press Autoscale on the oscilloscope.
6 Press the Quick Meas key, then press the Peak-Peak softkey.
Wait a few seconds for the measurement to settle (averaging is then complete).
View the Pk-Pk reading at the bottom of the display.
Record the reading: V
p-p
= _______ V.
7 Change the frequency of the signal generator to the value shown below
for your instrument.
Table 3-7 Signal Generator Frequency Setting
8
Change the time base to 5 ns/div.
a Wait a few seconds for the measurement to settle.
b View the Pk-Pk reading at the bottom of the display.
c Record the reading: V
p-p
= ______ mV.
9
Calculate the response using this formula:
If the result is not ±3 dB, see the “Troubleshooting” chapter. Then return here.
10 Repeat this procedure (steps 1 to 9) for channel 2.
Selected Channel 54641A/41D 54642A/42D
Channel 1 350 MHz 500 MHz
Channel 2 350 MHz 500 MHz
20 10log
Step8Result
Step6Result
--------------------------------
⋅
service.book Page 14 Wednesday, August 28, 2002 3:25 PM
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