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1 Set up the power module by following the instructions in the User and
2 Connect the probe using "To connect the probe" on page 12" of this
3 Turn on the power for the power module.
4 Set the appropriate Remote/Local switch.
5 With Local control, set the appropriate Zero/Variable switch.
6 Connect the probe to the signal to be measured.
7 If necessary, adjust the Coarse and Fine offset controls so the desired
See Also
Using the probe with the 1143A power module
Probe power and offset control is provided by the 1143A Probe Offset Control
and Power Module.
Service Guide.
guide.
• To control offset voltage with the power module, set the switch to
Local.
• To control the offset voltage remotely, set the switch to Remote.
• To enable the local offset control, set the switch to Variable.
• To disable the local offset control, set the switch to Zero.
If the oscilloscope has an offset feature, be sure that it is set to zero so
that the probe offset does not have to compensate for the oscilloscope
offset.
part of the signal is displayed on the oscilloscope. See sidebar below.
The offset range is greater than 50 V relative to the probe tip.
Bandwidth issues are the same as covered on the previous page
The probe has limiting designed to avoid excessive power dissipation. The input
operating range of the probe is 5 V. If the input and offset exceeds +14V relative
to the probe tip, the output of the probe will limit at +1.4 V. As the input plus
offset reaches -14 V the output will limit at -1.4 V; then, it will fold back to
approximately -0.8V as the input plus offset exceeds -14 V. The output of the
probe will remain at the limit voltage until the input plus offset falls below
approximately -8 Vdc.
The User and Service Guide for the 1143A Probe Offset Control and Power
Module about remote probe operation.
Chapter 1: Operating the Probe
Probe Operating Range
15
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