Keysight Infiniium 8000 Series, Service Manual

Page: 29 / 162

Chapter 2: Preparing for Use
Digital probe lead set
29
Digital probe lead set
The probe lead set has 16 digital channels with a ground lead for each channel.
Figure 2-10
Digital Probe Lead Set
If a 0.63 mm square pin or a 0.66 diameter round pin is installed on the circuit under
test, the signal and ground leads can be directly connect to these pins. Otherwise, the
IC clips can be used to connect to the circuit.
C A U T I O N Do not exceed the maximum input voltage rating of ±40 V peak, CAT I.
Probe tip isolation network and equivalent load
The probe tips of the probe lead set contain an isolation network which serves to
minimize the loading effect of the digital channels on the circuit under test. The isolation
network schematic is shown in Figure 2- 11.
Figure 2-11
Probe Tip Isolation Network
The loading effect of the probe tip on the circuit under test is represented by the circuit
shown in the equivalent load schematic in Figure 2- 12.
The digital clip lead marked clk (clock) is unused. All the other digital clip leads are
used for the digital channels.
!
250
Ω
Signal
90.9 k
Ω
8.2 pF
To Oscilloscope