Testing Threshold Accuracy
Testing the threshold accuracy verifies the data channel threshold
accuracy specification. You should perform this test every 24 months
or 4000 hours of operation, whichever comes first.
These instructions include detailed steps for testing the threshold
settings of channels 0-7. After testing channels 0-7, connect and test
channels 8-15, then the external trigger input. Use the detailed steps
for channels 0-7, substituting channels 8-15 or external trigger for
channels 0-7 in the instructions.
Each threshold test tells you to record the voltage reading in the
Performance Test Record located at the end of this chapter. To check
if each test passed, verify that the voltage reading you record is within
the limits listed on the Performance Test Record.
Table 13 Equipment Required
Equipment Critical Specifications Recommended Model/Part
Digital Multimeter 0.1 mV resolution, 0.005%
accuracy
HP 34401A
Function Generator DC offset voltage
±
6.3 V HP 3325B Option 002
BNC-Banana Cable HP 11001-60001
BNC Tee HP 1250-0781
BNC Cable HP 10503A
BNC Test Connector, 8-by-2
169
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