Keysight N2791A User manual

N2791A 25 MHz and

N2891A 70 MHz

High-Voltage

Differential Probes

User’s

Guide

Contents

Inspecting the Probe 3

Cleaning the Probe 3

Handling the Probe 3

N2791A/N2891A High-Voltage Differential Probes 4

Contents and Accessory Kits 5

Characteristics 7

Safety Information 9

Using the N2791A High-Voltage Differential Probe 10

Using the N2891A High-Voltage Differential Probe 11

N2791A Plots 12

N2891A Plots 16

Using the Accessories 20

N2791A Performance Verification Procedures 21

N2791A Performance Verification Test Record 23

N2891A Performance Verification Procedures 24

N2891A Performance Verification Test Record 26

Inspecting the Probe

❏Inspect the shipping container for damage.

Keep the damaged shipping container or cushioning material until the contents

of the shipment have been checked for completeness and the probe has been

checked mechanically and electrically.

❏Check the accessories.

• If the contents are incomplete or damaged, notify your Keysight Technologies

Sales Office.

❏Inspect the instrument.

• If there is mechanical damage or defect, or if the probe does not operate

properly or pass calibration tests, notify your Keysight Technologies Sales

Office.

• If the shipping container is damaged, or the cushioning materials show signs

of stress, notify the carrier as well as your Keysight Technologies Sales Office.

Keep the shipping materials for the carrier’s inspection. The Keysight

Technologies office will arrange for repair or replacement at Keysight

Technologies’ option without waiting for claim settlement.

Cleaning the Probe

Disconnect the probe and clean it with a soft cloth. Make sure the probe is

completely dry before reconnecting it to an oscilloscope. Avoid using abrasive

cleaners and chemicals containing benzene or similar solvents.

Handling the Probe

Handle the probe with care and refer to the safety notices at the back of this

manual and on page 9. Note that the probe cable is a sensitive part of the probe

and, therefore, you should be careful not to damage it through excessive bending

or pulling. You should also avoid any mechanical shocks to this product in order

to guarantee accurate performance and protection.

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 user-

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

Contents and Accessory Kits

The following table lists the parts included with the N2791A high-voltage

differential probe.

For N2791A replacement accessories, you can order the N2791-68700

Differential Probe Accessory Kit. It includes:

Part Quantity

N2791A 25 MHz differential probe 1

Safety Hook, Red 1

Safety Hook, Black 1

Alligator Clip, Red 1

Alligator Clip, Black 1

USB Power Cord (2 m) 1

AA Battery 4

Trimmer Tool 1

User’s Guide 1

Part Quantity

Safety Hook, Red 1

Safety Hook, Black 1

Alligator Clip, Red 1

Alligator Clip, Black 1

USB Power Cord (2 m) 1

Contents and Accessory Kits

The following table lists the parts included with the N2891A high-voltage

differential probe.

For N2891A replacement accessories, you can order the N2891-68700

Differential Probe Accessory Kit. It includes:

Part Quantity

N2891A 70 MHz differential probe 1

Safety Hook, Red 1

Safety Hook, Black 1

High Voltage Alligator Clip, Red 1

High Voltage Alligator Clip, Black 1

USB Power Cord (2 m) 1

AA Battery 4

Trimmer Tool 1

User’s Guide 1

Part Quantity

Safety Hook, Red 1

Safety Hook, Black 1

High Voltage Alligator Clip, Red 1

High Voltage Alligator Clip, Black 1

USB Power Cord (2 m) 1

Characteristics

Characteristics 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 MWoscilloscope

input)

70 MHz (driving 1 MWoscilloscope

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

\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 MWoscilloscope input) \7 V (driving 1 MWoscilloscope

input)

Offset (typical) \7.5 mV (adjustable) \5 mV (adjustable)

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 USBpower 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

Characteristics

Mechanical Characteristics

Environmental Specifications (same for both N2791A and N2891A)

Safety Specifications

N2791A N2891A

Weight (probe only) 400 g (probe and PVC jacket) 500 g

BNC Cable Length 95 cm (37 inches) 90 cm (35 inches)

Length of Input Leads 45 cm (18 inches) 60 cm (24inches)

Dimensions (L x W x H) 170 mm x 63 mm x 21 mm

(6.7 inches x 2.5 inches x 0.83 inches)

202 mm x 83 mm x 38 mm (8.0 inches x

3.3 inches x 1.5 inches)

Temperature Operating: -10 °C to +40 °C

Nonoperating: -30 °C to +70 °C

Altitude Operating: 3,000 m

Nonoperating: 15,300 m

Humidity Operating: 25 - 85% room humidity

Nonoperating: 25 - 85% room humidity

Pollution Degree Pollution Degree 2

CEI/IEC 61010-031 CAT II (N2791A)

CEI/IEC 61010-031 CAT I (N2891A)

Safety Information

Warning To avoid personal injury and to prevent fire or damage to this product or products

connected to it, review and comply with the following safety precautions. Be

aware that if you use this probe assembly in a manner not specified, the protection

this product provides may be impaired.

Observe Maximum Working Voltage

To avoid injury, do not use the N2791A probe above 1000 Vrms CAT II (both 10:1

and 100:1 attenuation settings) between each input lead and earth or between

the two input leads. Do not use the N2891A probe above 5000 Vrms CAT I (1000:1

attenuation) or 500 Vrms CAT I (100:1 attenuation) between the two input leads.

Do not use the N2891A probe above 5000 Vrms CAT I (both 100:1 and 1000:1

attenuation settings) between each input lead and earth.

Must be Grounded

Before making connections to the input leads of this probe, ensure that the output

BNC connector is attached to the BNC channel input of the oscilloscope and the

oscilloscope is properly grounded.

Use Fused Test Prods if Necessary

If this probe is intended to be used with circuits of installation category II, it should

incorporate the fused test prods.

Do Not Operate Without Covers

To avoid electrical shock or fire hazard, do not operate this probe with the covers

removed.

Do Not Operate in Wet / Damp Conditions

To avoid electrical shock, do not operate this probe in wet or damp conditions.

Do Not Operate in an Explosive Atmosphere

To avoid injury or fire hazard, do not operate this probe in an explosive

atmosphere.

Avoid Exposed Circuit

To avoid injury, remove jewelry such as rings, watches, and other metallic objects.

Do not touch exposed connections and components when power is present.

Using the N2791A High-Voltage Differential Probe

Use Proper Power Source

To ensure this probe functions well, use four AA batteries or the supplied USB

power cord.

For Indoor Use Only

Only use this probe indoors.

Do Not Operate With Suspected Failures

If you suspect there is damage to this probe, have it inspected by a qualified

service personnel.

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.

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.

To replace batteries, first slip off

the cover

Then slide the battery cover off

on the rear of the probe

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