User`s guide

10
Using the N2791A High-Voltage Differential Probe
Do Not Operate With Suspected Failures
If you suspect there is damage to this probe, have it inspected by a qualified service
personnel.
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Using the N2791A High-Voltage Differential Probe
• To use this probe, first insert the four AA batteries into the probe or connect the USB
power cord to the probe and a USB port (see page 4 to see where the USB power
cord input is located on the probe).
• Then connect the BNC output connector to the channel input of the oscilloscope.
The oscilloscope must have a ground referenced.
• Select the proper attenuation ratio (10:1 or 100:1) on the probe via the attenuation
switch and specify the attenuation and probe configuration on your oscilloscope.
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TIP: When measuring signals below 70 V, switch the attenuation ratio to 10:1 in order
to obtain a higher resolution signal with less noise. Otherwise set the attenuation
ratio to 100:1. 
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To replace batteries, first slip
off the cover
Then slide the battery cover off
on the rear of the probe