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3-18
Testing Performance
To verify trigger sensitivity
Test Internal Trigger Sensitivity
1
Press the Save/Recall key, then press the Default Setup softkey.
2 Connect the calibrator to channel 1 using a 50Ω feedthrough at the
oscilloscope input.
3 Verify the trigger sensitivity at 25 MHz and 0.35 divisions.
a Set the output of the calibrator to 25 MHz, and set the amplitude to about
100 mV
p-p
.
b Press the Autoscale key.
c Set the time base to 50 ns/div.
d Set channel 1 to 100 mV/div.
e Decrease the output of the calibrator until 0.35 vertical divisions of the
signal are displayed.
The trigger should be stable. If the trigger is not stable, try adjusting the
trigger level. If adjusting the trigger level makes the trigger stable, the test
still passes. If adjusting the trigger does not help, see the “Troubleshooting”
chapter. Then return here.
f Record the result as Pass or Fail in the Performance Test Record.
4
Verify the trigger sensitivity at maximum bandwidth and 0.35 division.
a Change the output of the calibrator to 100 MHz for the 54622A/22D/24A or
60 MHz or the 54621A/21D, and set the amplitude to about 100 mV
p-p
.
b Set the time base to 10 ns/div.
c Decrease the output of the calibrator until 0.35 vertical divisions of the
signal is displayed.
The trigger should be stable. If the trigger is not stable, try adjusting the
trigger level. If adjusting the trigger level makes the trigger stable, the test
still passes. If adjusting the trigger does not help, see the “Troubleshooting”
chapter. Then return here.
d Record the result as Pass or Fail in the Performance Test Record.
5
Repeat this procedure for channels 2, 3, and 4, as applicable to your
oscilloscope model.
service.book Page 18 Wednesday, December 18, 2002 8:35 AM