Agilent Technologies HP 3325B Manual de instrucciones descargar pdf (Pagina 74)

Chapter 1 Performance Tests

Test 1: Trigger Level (Agilent 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 Agilent 3325B DC OFFSET to +60 mV.

10 Now, decrement the offset on the Agilent 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 Agilent 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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Agilent Technologies HP 3325B Manual de instrucciones Pagina 74