Test The 0 V User Threshold - HP 1660E Series Service Manual

Testing Performance
To test the threshold accuracy (logic analyzer)
Test the 0 V User threshold
1 Move the cursor to the field to the right of Pod AI. Type 0, then press the Select key.
2 On the function generator front panel, enter +0.102 V ±1 mV DC offset. Use the
multirneter to verify the voltage.
The activity indicators for pod 1 should show
all
data channels and the J-clock channel at a
logic high.
3 Using the Modify down arrow on the function generator, decrease offset voltage in
I-mV increments until all activity indicators for pod 1 show the channels at a logic
low. Record the function generator voltage in the performance test record.
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II I
4 Using the Modify up arrow on the function generator, increase offset voltage in
I-mV increments until all activity indicators for pod 1 show the channels at a logic
high. Record the function generator voltage in the performance test record.
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15. 87.
.. 11···........·····1
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-~
Timing AcquIsitIon MOde
I
(sumbols]
Conventlonal Full Channel 250 MHz ~
Clock Inputs
l ~ ~
(Analyzer
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Format t1ACHINE I
1
3-16