Instruction manual

Chapter 1 Performance Tests
Test 2: Trigger Level (Agilent 53131A/132A Only)
Assembly-Level Service Guide 1-21
1
7 In the Counter’s Channel 1 Trigger/Sensitivity menu, change the SLOPE to
NEG.
8 Set the Agilent 3325B DC OFFSET to +60 mV.
9 On the Counter, press Run key.
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
a stable reading of 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 appropriate place in the Performance Test
Record (Test 2, Line 1).
14 Repeat steps 1 through 13 for Channel 2.
15 Record the trigger level value in the appropriate place in the Performance Test
Record (Test 2, Line 2).
16 Disconnect the test setup.