45 | Keysight | Probing Solutions for Logic Analyzers - Data Sheet
40-pin and 90-pin Logic Analyzers Probe Cables
Signal line loading
Any probed signal line must be able to supply a minimum of 600 mV (unless noted
otherwise — see probe of interest) to the probe tip while the probe is connected to the
system. The maximum input voltage of each probe is ± 40 volts peak (unless noted
otherwise — see probe of interest).
Probe cables
The probe cable (see Figure 10.1 and Table 10) contains 16 signal lines and two clk lines,
two +5 volt power lines, and ground lines for each of the signal/clock and power lines.
All of these lines are contained in a 4.5-foot cable. The probe cable is included with the
logic analyzer. The cable grounds are chassis (earth) grounds, not “floating” grounds.
The two +5 volt power lines can be used to power active probing systems. Consult the
specifications for the individual logic analyzers or logic analyzer cards for the maximum
allowable current through each +5 volt power supply.
Figure 8.1. Typical logic analyzer probe cable.
Caution: These +5 volt power lines MUST NOT be connected to the target’s power
supply.
Caution: Be careful when using straight wire probe leads, one common ground, or
RC networks located far from the target. These circumstances increase the impact
of analog effects such as crosstalk and EMT susceptibility, which contribute to
measurement errors.
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