Keysight N2800A User Manual page 97

Measuring Input Resistance for ZIF Probe Heads or Solder-in Probe Heads
1 Connect the BNC to SMA adapter and BNC to Banana Plug adapters as shown in
Figure
2 Position the PV fixture on a table top and clamp it with a small bench vise to steady it.
Ensure that the PV fixture is flush with the table top so that when the banana plugs are
probed, it does not rock the PV fixture.
Figure 70 Measuring the differential input resistance of a ZIF or solder-in probe head
3 Connect the probe amplifier to the oscilloscope or power supply so it is powered.
4 Connect the ZIF or solder-in probe head to the probe amp and insert it into the PV fixture
as shown
5 Depress the pincher fingers on the PV fixture so they open and carefully insert the tip wires
under the pinchers. Release the pichers once the tips are inserted.
6 As shown in
one tip wire is connected to the signal line and the other tip is connected to the PV fixture
ground, this is a measurement of the differential input resistance. It should be 100 kOhms
+/- 2% (98 to 102 kOhms).
7 To measure the single-ended input resistance, measure the resistance between the signal
plug of the banana adapter and the probe amplifier ground, which can be accessed as
shown in
Figure 71 Measuring the single-ended input resistance of a ZIF or solder-in probe head
InfiniiMax III Series Probes User's Guide
70.
Figure 70.
Figure 70, measure the DC input resistance between the banana plugs. Since
Figure 71 (through the vent window of the probe amplifier).
Performance Verification
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