HP 181A manual This is the trigger level it should be 0.0 V ±15 mV

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Chapter 1 Performance Tests

Test 1: Trigger Level (HP 53181A Only)

7In the Counter’s Channel 1 Trigger/Sensitivity menu, change the SLOPE to NEG.

8On the Counter, press Run key.

9Set the HP 3325B DC OFFSET to +60 mV.

10Now, decrement the offset on the HP 3325B by −1 mV until the

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.

11Add 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.

12Now, 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.

13Record the trigger level value in the Performance Test Record (Test 1, Line 1).

1-50 Assembly-Level Service Guide