Agilent Technologies 54830 Series, Service Manual

Page: 40 / 170

Chapter 2: Preparing for Use
Digital probe lead set
2–13
Digital probe lead set
The probe lead set has 16 digital channels with a ground lead for each channel.
Figure 2-9
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.
CA U T IO 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 2-10.
Figure 2-10
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 2-11.
The MSO Infiniium oscilloscopes are the only oscilloscopes that have 16 digital
channels.
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