User`s guide

11
Using the N2891A High-Voltage Differential Probe
• Using the appropriate probe accessories, connect the inputs to the circuit under test. 

To protect against electrical shock, use only the accessories supplied with this probe
or in the accessory kit.


This probe is to carry out differential measurements between two points on the circuit
under test. This probe is not for electrically insulating the circuit under test and the
measuring instrument.
Using the N2891A 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 (100:1 or 1000:1) on the probe via the attenuation
switch (see the picture on page 4) and specify the attenuation and probe
configuration on your oscilloscope.


TIP: When measuring signals below 700 V, switch the attenuation ratio to 100:1 in
order to obtain a higher resolution signal with less noise. Otherwise set the
attenuation ratio to 1000:1. 
• Using the appropriate probe accessories, connect the inputs to the circuit under test. 

To protect against electrical shock, use only the accessories supplied with this probe
or in the accessory kit.


This probe is to carry out differential measurements between two points on the circuit
under test. This probe is not for electrically insulating the circuit under test and the
measuring instrument.
Slide the battery cover off the
rear of the probe body
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