14 MIL-STD 1553 Triggering and Serial Decode
324 InfiniiVision 7000B Series Oscilloscopes User’s Guide
Probing MIL-STD 1553 Signals
The MIL- STD 1553 differential bus must be probed with a differential
active probe.
Agilent recommends the N2791A 25 MHz differential active probe.
Output of the differential probe must be fed, via a BNC tee and two
equal- length BNC cables, into two channels of the oscilloscope. This way,
the oscilloscope can perform dual threshold triggering (using upper and
lower thresholds).
This N2791A differential probe works well because it is designed for
1 MOhm impedance oscilloscope inputs.
If you use a different differential probe that is designed for 50 Ohm
impedance oscilloscope inputs, be sure to set only one of the oscilloscope
channel input impedances to 50 Ohms (because the two input channel’s
impedances are seen in parallel).
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