HP 181A Manual de usuario descargar pdf (Pagina 72)

Chapter 1 Performance Tests

Test 1: Trigger Level (HP 53181A Only)

1-50 Assembly-Level Service Guide

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.

10 Now, 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.

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).

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HP 181A Manual de usuario Pagina 72