HP 53132A Assembly And Service Manual page 72

Chapter 1 Performance Tests
Test 1: Trigger Level (HP 53181A Only)
7 In the Counter's Channel 1 Trigger/Sensitivity menu, change the
SLOPE to NEG.
8 On the Counter, press Run key.
9 Set the HP 3325B DC OFFSET to +60 mV.
Now, decrement the offset on the HP 3325B by −1 mV until the
10
Counter's Gate annunciator flashes and continue decrementing
until the Counter displays approximately 1 MHz.
Observe the offset value on the display of the HP 3325B.
Record the value__________ mV.
11 Add the lower peak voltage (−40mV) of the 80 mVp-p signal to the
offset value in step 10 (for example, 21 mV − 40 mV = −19 mV.)
This result is the lower hysteresis level.
Record the lower hysteresis level __________ mV.
12 Now, add the upper hysteresis value (recorded in step 6 )and
lower hysteresis value (recorded in step 11).
This is the trigger level; it should be 0.0 V ±15 mV.
13 Record the trigger level value in the Performance Test Record
(Test 1, Line 1).
1-50 Assembly-Level Service Guide