User's Manual

3-19
Testing Performance
To verify trigger sensitivity
Test External Trigger Sensitivity
Verify the external trigger sensitivity at these settings:
100 MHz (54622A/22D/24A), <150 mV
p-p
60 MHz (54621A/21D), <150 mV
p-p
25 MHz (All models), <75 mV
p-p
1 Use the power splitter to connect the calibrator to both the channel 1
input and the external trigger input. The Ext Trigger input is on the rear
panel of the mixed-signal oscilloscope and the 4-channel oscilloscope.
Connect 50
Ω feedthroughs to the oscilloscope inputs.
2 Change the output of the calibrator to 100 MHz for the 54622A/22D/24A
or 60 MHz for the 54621A/21D, and set the amplitude to 106 mV
rms
(300 mV
p-p
).
The power splitter divides the 300 mV
p-p
so that 150 mV
p-p
is applied to each
of the oscilloscope inputs.
3
Press the Autoscale key.
4 Press the Trigger Edge key, then press the Ext softkey to set the trigger
source to
external trigger.
5 Check for stable triggering, and adjust the trigger level if necessary.
6 Record the results as Pass or Fail in the Performance Test Record.
If the test fails, see the “Troubleshooting” chapter. Then return here.
7 Change the output of the calibrator to 25 MHz and set the amplitude to
25.74 mV
rms
(75 mV
p-p
).
8 Check for stable triggering, and adjust the trigger level if necessary.
9 Record the results as Pass or Fail in the Performance Test Record.
If the test fails, see the “Troubleshooting” chapter. Then return here.
service.book Page 19 Wednesday, December 18, 2002 8:35 AM