User`s guide

4
N2791A/N2891A High-Voltage Differential Probes
N2791A/N2891A High-Voltage Differential Probes
The N2791A/N2891A high-voltage differential probes allow conventional earth-
grounded oscilloscopes to be used for floating signal measurements (up to 700 V of
differential or common mode voltage for the N2791A and up to 7000 V of differential
or common mode voltage for the N2891A). The N2791A offers users selectable
attenuation settings of 10:1 and 100:1 while the N2891A offers attenuation settings of
100:1 and 1000:1, making both probes highly versatile and usable for a broad range of
applications including power supply measurements and motor controls. Both probes
are compatible with any oscilloscope with a 1 MW BNC input. The probes can be
powered by any USB port on an oscilloscope or computer, or by internal batteries (4x
AA included with the probe).
The images below show some key parts of the N2891A probe body. The N2791A has
similar switches/LEDs, but they are arranged differently.
Battery Use
• Insert 4 AA batteries in the back of the unit as indicated within the chassis (see
pages 10-11 for information on accessing the battery location)
• When battery life has expired, remove the batteries
• When the batteries gets close to running out, the power indicator will start to
flicker and dim
• Note the WEEE label on the batteries and dispose of properly
on/off switch
power LED
indicator
attenuation
switch
USB power
cord input
overrange
indicator