User`s guide

7
Characteristics and Specifications
Characteristics and Specifications
Characteristics and specifications for the N2791A and N2891A high-voltage differential
probes are shown below. The probe / oscilloscope should be warmed up for at least 20
minutes before any testing and the environmental conditions should not exceed the
probe’s specified limits.
Electrical Characteristics
N2791A N2891A
Bandwidth (-3 dB) >25 MHz (driving 1 MW oscilloscope
input)
70 MHz (driving 1 MW oscilloscope
input)
Attenuation ratio 10:1, 100:1 (switchable) 100:1, 1000:1 (switchable)
Probe Risetime (10%-90%) 14 ns 5 ns
Absolute Maximum Rated
Input Voltage (each side to
ground)
1000 Vrms CAT II 5000 Vrms CAT I
Maximum Differential Input
Voltage (DC + AC Peak)
\70 V at 10:1 attenuation
\700 V at 100:1 attenuation
\700 V at 100:1 attenuation
\7000 V at 1000:1 attenuation
Maximum Common Mode
Input Voltage
\70 V at 10:1 attenuation
\700 V at 100:1 attenuation
\7000 V at 10:1 attenuation
\7000 V at 1000:1 attenuation
Input Impedance  4 MW, 10 pF (each side to ground)
8 MW, 8 pF (between inputs)
50 MW, 7 pF (each side to ground)
100 MW, 5 pF (between inputs)
Output Voltage Swing \7 V (driving 1 MW oscilloscope
input)
\7 V (driving 1 MW oscilloscope
input)
Offset (typical) \7.5 mV \5 mV
CMRR (typical) -80 dB at 60 Hz, -40 dB at 1 MHz -80 dB at 50 Hz, -60 dB at 20 kHz
Power Requirements 4 AA batteries or USB power adapter 
(5 V/200 mA, 9 V/120 mA)
4 AA batteries or USB power
adapter (5 V/200 mA, 9 V/120 mA)
Battery Life 15 hours (alkaline battery) 11.5 hours (alkaline battery)
Battery/Power Cord The supplied voltage must be less
than 12 V and greater than 4.4 V or
else the probe could be damaged
The supplied voltage must be less
than 12 V and greater than 4.4 V or
else the probe could be damaged
- all are typical