Adjustment and Verification Procedures
20
P6339A Instruction Manual
2. Measure the voltage on TP2 with a DMM and set the HF Adjust
potentiometer until the voltage at TP2 is –0.50
±
0.05 VDC.
Compensate the Probe
1. Set up the equipment as shown in Figure 8.
2. With the P6339A probe installed on the 1103 power supply, set
all the DIP switches to the “0” position. See Figure 7 on page 18.
3. Using Table 7 on page 19, set the DIP switches for 50 mV/div.
CH 1
output
50
W
BNC cable
P6339A
Test oscilloscope
Gnd
Signal
CH 1 input
Probe compensation
(
[
0.5 V
p-p
, 1 kHz square wave)
1103
CH 1 input
Figure 8: Setup for probe compensation and high frequency adjustment
4. Press AUTOSET or otherwise adjust your digitizing oscilloscope
to display a meaningful waveform.
5. Adjust the LF COMP trimmer, C7 (Figure 7 on page 18), until
you see a perfectly flat-top square wave on the display (Figure 9).
Under compensated
Overcompensated
Properly compensated
Figure 9: Probe compensation waveforms
