Instruction manual

Chapter 1 Performance Tests
Test 1: Trigger Level (Agilent 53181A Only)
Assembly-Level Service Guide 1-49
1
Procedure
1 Connect the output of the Agilent 3325B to Channel 1 of the Counter as shown in
Figure 1-11.
Figure 1-11. Trigger Level Test Setup
2 Set the Agilent 3325B to output a 1 MHz, 80 mVp-p square wave signal.
3 Set the Agilent 3325B DC OFFSET to −60 mV.
4 On the Counter, press Run key.
5 Now, increment the dc offset on the Agilent 3325B by +1 mV until the Counter’s
Gate annunciator flashes and continue incrementing until the Counter displays
approximately 1 MHz.
Observe the offset value on the display of the Agilent 3325B.
Record the dc offset value__________ mV.
6 Add the upper peak voltage (40 mV) of the 80 mV p-p signal to the offset value in
step 5 (For example, −24 mV + 40 mV = 16 mv).
This is the upper hysteresis level.
Record the upper hysteresis level__________ mV.
HP 53181A
Counter
Channel 1
HP 3325B
Synthesizer
Output