Keysight Infiniium 8000 Series, Service Manual

Page: 85 / 162

Chapter 5: Troubleshooting
To check probe power outputs
85
To check probe power outputs
Probe power outputs are on the front panel, surrounding each BNC input.
Any failure may be a problem with the probe power and control assembly, the AutoProbe
flex cable W8, or the probe power and control cable W17.
Use the table and figure to the right
to check the power output at the
connectors.
The +12 V and –12 V supplies
come directly from the power
supply, and the +3 V and –3 V
supplies are developed in three-
terminal regulators on the probe
power & control assembly.
Measure the voltages with respect
to the ground terminal on the front
panel, located near the Aux Out
BNC.
Do not attempt to measure voltages
at pins 3 through 7.
Pin Supply
1 +3V
2 –3V
3 Offset
4 Data
5 &
ring Probe ID
6 Clk
7 R
p
8 –12 V
9 +12 V