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To adjust offset zero
This procedure adjusts the offset zero of the probe. Some offset in the probe
can be caused by a residual offset signal from the probe's control input.
Therefore, the procedure compensates for any external offset signal.
Equipment Required
Equipment
Power Supply
Digital Multimeter
Power Supply
Adapter
Termination
1 With a #10 Torx screwdriver, remove the two screws at the "N"
connector end of the probe power housing.
2 Slide the end plate aside, then slide the cover off the power housing.
3 To avoid damage to the cabling, temporarily refasten the end plate to
the power housing.
4 Short the input pin of the probe to the shield at the probe tip.
You can use the 11880A which is the Type N-to-probe tip adapter used in the
bandwidth test. It has an internal 50-Ω termination. The objective is to
effectively short the probe input without inducing any signal. Another method
can be used if it provides the same result.
5 Terminate the output of the probe with the N-to-BNC adapter and BNC
50-Ω feedthrough.
6 Connect the probe power connector to the 1143A power module or an
oscilloscope with the appropriate probe power connection.
7 Apply power and allow at least a 3-minute warm-up.
8 Set the Zero/Variable switch on the power module to Zero or set the
oscilloscope vertical offset to 0.0 V.
Critical Specifications
1 Vdc
Better than 0.1% accuracy
Power and control for probe under test
N(f)-to-BNC(m)
50 Ω, BNC feed-through
Chapter 3: Service
Making Adjustments
Recommended
Model/Part
6114A
3458A
1143A
10100C
49
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