Agilent Technologies 1141A, User'S Manual And Service Manual, Page: 49 / 88

Adjusting the Probe 3
Probe Adjustment
1141A and 1142A User’s Guide 49
Figure 26 Signal to Both Inputs
20 Set the function generator output to 1.0 V
p- p
.
21 On the oscilloscope, set the channel 1 sensitivity to 1.00 mV/div.
22 Adjust R11 for minimum signal amplitude as shown in V
p- p
reading
for channel 1. Adjust R11 slowly and use
CLEAR DISPLAY
frequently
to restart averaging.
Step 3. Adjust the Low
Frequency Response and
CMRR
This adjustment sequence continues from the HF Gain and HF
CMRR adjustments. Adjust R14 and C4 for pulse response, and
adjust C6 for low- frequency CMRR.
23
Change the function generator settings to a 2.5 kHz square wave
with 600 mV
p- p
amplitude.
24 Change the oscilloscope settings to:
25
Carefully connect the input of the probe to the test board in the
position shown in
Figure 27 .
Table 13 Oscilloscope Settings
Menu Selection Setting
TIMEBASE (time/div) 50 µs/div
CHAN 1 (sensitivity) 100 mV/div