Keysight N2894A, N2870A series User Manual

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N2870A-Series and N2894A Passive Probes

User’s Guide

Page 2

Notices

CAUTION

WARNING

- 2014, 2016, 2018 This product complies with the WEEE Directive (2002/96/EC) marking requirements. The affixed label indicates

that you must not discard this electrical/electronic product in domestic household waste. Product Category: With reference to the equipment types in the WEEE Directive Annex I, this product is classed as a “Monitoring and Control instrumentation” product. Do not dispose in domestic household. To return unwanted products, contact your local Keysight office, or refer to www.keysight.com for more information.

This symbol indicates the Environmental Protection

Use Period (EPUP) for the product’s toxic substances for the China RoHS requirements.

Recycle marking.

Manual Part Number

N2876-97002

Edition

October 2018 Printed in Germany

U.S. Government Rights

The Software is "commercial computer software," as defined by Federal Acquisition Regulation ("FAR") 2.101. Pursuant to FAR 12.212 and

27.405-3 and Department of Defense FAR Supplement ("DFARS")

227.7202, the U.S. government acquires commercial computer soft-

ware under the same terms by which the software is customarily provided to the public. Accordingly, Keysight provides the Software to U.S. government customers under its standard commercial license, which is embodied in its End User License Agreement (EULA), a copy of which can be found

http://www.key-

sight.com/find/sweula

set forth in the EULA represents the exclusive authority by which the U.S. government may use, modify, distribute, or disclose the Software. The EULA and the license set forth therein, does not require or permit, among other things, that Keysight: (1) Furnish technical information related to commercial computer software or commercial computer software documentation that is not customarily provided to the public; or (2) Relinquish to, or otherwise provide, the government rights in excess of these rights customarily provided to the public to use, modify, reproduce, release, perform, display, or disclose commercial computer software or commercial computer software documentation. No additional government requirements beyond those set forth in the EULA shall apply, except to the extent that those terms, rights, or licenses are explicitly required from all providers of commercial computer software pursuant to the FAR and the DFARS and are set forth specifically in writing elsewhere in the EULA. Keysight shall be under no obligation to update, revise or otherwise modify the Software. With respect to any technical data as defined by FAR 2.101, pursuant to FAR 12.211 and 27.404.2 and DFARS

227.7102, the U.S. government acquires no greater than Limited Rights as defined in FAR 27.401 or

. The license

DFAR 227.7103-5 (c), as applicable in any technical data. 52.227-14 (June 1987) or DFAR 252.227-7015 (b)(2) (November 1995), as applicable in any technical data.

Safety Notices

A CAUTION notice denotes a hazard. It calls attention to an operating procedure, practice, or the like that, if not correctly performed or adhered to, could result in damage to the product or loss of important data. Do not proceed beyond a CAUTION notice until the indicated conditions are fully understood and met.

A WARNING notice denotes a hazard. It calls attention to an operating procedure, practice, or the like that, if not correctly performed or adhered to, could result in personal injury or death. Do not proceed beyond a WARNING notice until the indicated conditions are fully understood and met.

Keysight N2870A-Series and N2894A Passive Probes User’s Guide

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Contents

Introduction 4

Safety Information 7

Low-Frequency Compensation 9

Accessories 10

Available Accessories 17

Replacing Rigid, Solid Probe Tip, and Spring-Loaded Probe Tips 11 Short Ground Blade and Ground Spring 12 Sprung Hooks 13 15 cm Ground Lead 13 BNC Adapter 13 Copper Pads 14 Insulator Cap 14 Channel Identification Rings 14 IC Caps 15 PCB Adapter Kit 16

Accessories in Kits 17 Other Individually Orderable Accessories 21

Characteristics and Specifications 24

Performance Verification Procedures 29

Performance Verification Test Record 32

IEC Measurement Category Definitions 33

IEC Pollution Degrees Definitions 34

Keysight N2870A-Series and N2894A Passive Probes User’s Guide

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Introduction

When used with a Keysight oscilloscope, the N2870A-Series and N2894A passive probes set a new standard for “high performance” probing of up to 1.5 GHz. These general purpose probes and accessories are a great choice if you are looking for high quality at a very reasonable price.

Table 1 Probe Models

Model Band width

(-3 dB)

N2870A 35 MHz 1:1 39 pF

Attenuation Ratio

Input C Input R

(scope + probe)

1 MΩ 55 V CAT II 1 MΩ —

Max Input Vol tage (AC RMS)

Scope Input Coupling

(+scope)

N2871A 200 MHz 10:1 9.5 pF 10 MΩ 400 V CAT I

300 V CAT II

N2872A 350 MHz 10:1 9.5 pF 10 MΩ 400 V CAT Ia

300 V CAT II

N2873A 500 MHz 10:1 9.5 pF 10 MΩ 400 V CAT Ia

300 V CAT II

N2874A 1.5 GHz 10:1 1.8 pF 500 Ω 8.5 V CAT I

N2875A 500 MHz 20:1 5.6 pF 20 MΩ 400 V CAT I

1 MΩ 10 - 25 pF

50 Ω —

1 MΩ 7-20 pF

300 V CAT

N2876A 1.5 GHz 100:1 2.2 pF 5 kΩ 21 V CAT I

N2894A 700 MHz

10:1 9.5 pF 10 MΩ 400 V CAT I

300 V CAT II

50 Ω —

1 MΩ 10 - 25 pF

a Measurement Category I, 1250 V transient overvoltage bMeasurement Category II c Measurement Category I, 0 V transient overvoltage d 700 MHz bandwidth available with InfiniiVision 4000X/6000X with 1 GHz or higher bandwidth models only

Scope Comp Range

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Faithful Reproduction of Signals

These probes offer bandwidths of 35 MHz, 200 MHz, 350 MHz, 500 MHz, 700 MHz, and 1.5 GHz along with various attenuation ratios to address a wide range of measurement needs. For general purpose probing, the N2873A’s superior 10 M resistance, 9.5 pF of low input capacitance, and low inductance ground connection keep probe loading low enough to achieve high signal integrity measurements. The

1.5 GHz passive probe offers an even lower input capacitance for measuring faster edges more accurately, making it a good low-cost alternative to an active probe. All of these probes are automatically recognized when connected to Keysight InfiniiVision and Infiniium Series oscilloscopes.

Easy Access to Signals

The compact design along with a 2.5 mm probe tip diameter provide better visibility of the circuit under test when compared to the conventional 5 mm or 3.5 mm probes. This makes it easier to probe today’s fine pitched ICs and components. To learn more about probe tips and accessories, refer to “Accessories" on page 10.

Introduction

Ω input

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 performance verification 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.

Keysight N2870A-Series and N2894A Passive Probes User’s Guide

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Introduction

CAUTION

Cleaning the Probe

Handling the Probe

Disconnect the probe and clean it with a soft cloth dampened with a mild soap and water solution. Make sure the probe is completely dry before reconnecting it to an oscilloscope.

Handle the probe with care to avoid injury, especially when it is fitted with the extra thin and sharp spring contact tip.

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.

Keysight N2870A-Series and N2894A Passive Probes User’s Guide

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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.

Handle Probe Tips / Accessories Carefully. Some of the probe tips / accessories are very sharp (the spring tips and ground spring, for example). You should handle these with care to avoid personal injury.

Safety Information

Use Only Grounded Instruments. Do not connect the probe’s ground lead to a potential other than earth ground. Always make sure the probe and the oscilloscope are grounded properly.

Connect and Disconnect Properly. Connect the probe to the oscilloscope and connect the ground lead to earth ground before connecting the probe to the circuit under test. Disconnect the probe input and the probe ground lead from the circuit under test before disconnecting the probe from the oscilloscope.

Observe Probe Ratings. Do not apply any electrical potential to the probe input which exceeds the maximum rating of the probe. Make sure to comply with the voltage versus frequency derating curve on page 9.

Keep Away From Live Circuits. Avoid open circuitry. Do not touch connections or components when power is present.

Keysight N2870A-Series and N2894A Passive Probes User’s Guide

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Safety Information

WARNING

Indoor Use Only. Do not operate in wet/damp environments. Keep product surfaces dry and clean.

Do Not Operate With Suspected Failures Refer to qualified service personnel.

Do Not Operate in an Explosive Environment.

Keysight N2870A-Series and N2894A Passive Probes User’s Guide

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Low-Frequency Compensation

The N2871A, N2872A, N2873A, N2875A, and N2894A can be adjusted for low frequency (LF) compensation. The N2870A, N2874A, and N2876A cannot be adjusted.

The probe should be adjusted for LF compensation when it is connected to an oscilloscope input for the first time. LF compensation matches the probe cable capacitance to the oscilloscope input capacitance. This matching assures good amplitude accuracy from DC to the upper bandwidth limit frequencies. A poorly compensated probe clearly influences the overall system performance (probe and oscilloscope) and introduces measurement errors resulting in inaccurate readings and distorted waveforms. To perform the LF compensation:

Low-Frequency Compensation

To perform the LF compensation:

1 Connect the probe to the oscilloscope’s front-panel calibration output (a square

wave label is usually seen near this output).

2 Use the supplied trimmer tool to adjust the LF compensation to an optimum

square wave response as shown in this picture.

Figure 1 LF Compensation

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Accessories

The probe comes with the accessories listed in Table 2. For a broader range of available accessories, order the accessory kits described in “Available Accessories" on page 17.

Table 2 Supplied Accessories

Accessory Quantity N2871A,

N2872A, N2873A, N2875A, N2894A

Spring-loaded probe tips 2

Rigid probe tips 2

Ground blade 2.5 mm 1

Ground spring 2.5 mm 1

Sprung hook 2.5 mm 1

Short sprung hook 2.5 mm 1

Ground lead 15 cm 1

Copper pads 2

IC cap 2.5 - 0.5 mm green 1











N2870A N2874A,

N2876A



IC cap 2.5 - 0.65 mm blue 1

IC cap 2.5 - 0.8 mm gray 1

IC cap 2.5 - 1.0 mm brown 1

IC cap 2.5 - 1.27 mm black 1

BNC adapter 2.5 mm 1

Insulating cap 2.5 mm 1

Protection cap 2.5 mm 1

Keysight N2870A-Series and N2894A Passive Probes User’s Guide



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Accessories

Accessory Quantity N2871A,

N2872A, N2873A, N2875A, N2894A

Trimmer tool 1

Color coding rings 3x4 colors

User’s Guide 1





N2870A N2874A,

Replacing Rigid, Solid Probe Tip, and Spring-Loaded Probe Tips

The solid tips and spring-loaded tips are replaceable. Spring loaded probe tips offer a method of probing signals that is less susceptible to vibration or movement than traditional rigid tips. Many users find it easier to use this type of tip. The spring loaded tips work when they are either partially or fully compressed and are protected against over compression

damage.

N2876A

To change the probe tip, use pliers to grip the tip and pull it straight out of its contact socket along the axis of the probe. Do not grip the plastic insulator or the housing with the pliers because the tip could be crushed (see Figure 2). This could result in being unable to remove the tip and/or damaging the probe. Once the probe tip is removed, the new tip can be inserted with pliers into the contact socket along the axis of the probe. In order to insert the probe tip completely into the housing, carefully press the probe tip against a hard surface.

Keysight N2870A-Series and N2894A Passive Probes User’s Guide

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Accessories

WARNING

Short Ground Blade and Ground Spring

Figure 2 Proper Tip Removal Technique

You should exercise caution when using these sharp probe tips to avoid personal injury.

The short ground blade is the best performing ground connection available due to its low inductance. To attach the ground blade, simply push it over the probe tip and continue pushing until the blade is inserted into the notch located on the probe barrel, as shown in Figure 3. This will keep it from spinning around on the probe while in use. You can also bend and form the blade to reach your grounding location. In the picture, you can see that the ground blade was placed over the tip and then an IC cap accessory was placed over the tip.

Figure 3 Blade inserted into the Probe Notch

The ground spring offers similar performance as the ground blade and depending on the probing situation, may offer greater flexibility when making a ground connection. The ground spring is also inserted over the probe tip in a similar manner. It is mainly used for browsing as it is flexible and snaps back to original orientation (unlike the ground blade that you can form) which allows you to connect it to your grounding location and then move the probe tip around. It does have a slightly larger inductance than the ground blade which may result in some decrease in performance depending on the application.

Keysight N2870A-Series and N2894A Passive Probes User’s Guide

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Sprung Hooks

You will see a gray line (shown as black in the picture below) with an arrow pointing towards it on the barrel of your N287XA Series probe. This is used as a marker to tell you when you have pushed the sprung hook completely onto the probe. When inserting the sprung hook onto the probe barrel, push until you feel it lock onto the ridge (see

Figure 4). If you do not push the sprung hook to this point so it can engage and

“lock on” to the probe, the accessory may fall off or suffer a decrease in performance. If the sprung hook is correctly attached then the gray marking line should be covered when the hook is fully extended

Accessories

Figure 4 Ridge Location on Probe

15 cm Ground Lead

BNC Adapter

Both the rigid and spring-loaded probe tips are compatible with this adapter.

This ground lead can be used to reach grounding locations that are farther away from the probing location than can be reached by either the ground blade or ground spring. However, the longer lead means it has a larger inductance in the ground return path which corresponds to a lower performance than these other two grounding accessories.

Keysight N2870A-Series and N2894A Passive Probes User’s Guide

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Accessories

Copper Pads

These self adhesive copper pads can be attached on top of an IC and connected to its ground pins to create a convenient ground plane for the probe to connect to. When used with the ground blade, this method provides an ideal ground connection for probing signals with high frequency content. However, to maximize the performance of this setup, you need to connect the copper pad to as many grounding locations as possible.

Figure 5 Copper Pad on IC

Insulator Cap

This cap fits over the probe tip and covers the ground barrel of the probe, covering any potential shorting locations near the tip. This enables you to probe in hot environments without having to worry about shorts.

Channel Identification Rings

The channel identification rings can be used to keep track of which probe is connected to which channel input on your oscilloscope. Place one ring on the probe cable near the oscilloscope input and place another ring of the same color near the probe head. This ensures that you can pick up a probe and immediately know which channel it is connected to without having to track the cable back to the oscilloscope channel input.

Keysight N2870A-Series and N2894A Passive Probes User’s Guide

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IC Caps

Accessories

The IC caps fit over the probe tip and provide a convenient self-aligning connection to an IC’s pins. This helps maintain contact on small fine pitch legs and prevents shorting adjacent pins by preventing the probe tip from sliding between the legs of the component.

The different colored IC caps correspond to different pitches as listed in Table 2 on page 10.

Figure 6 shows how pitch is measured and how the caps

fit around the IC pins and where the probe tip comes through the cap. IC caps are compatible with both the rigid and spring loaded tips.

Figure 6 View of Top of IC with IC Cap Positioned Over IC Pin (not drawn to scale)

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Accessories

PCB Adapter Kit

The PCB Adapter Kit is not included in the Standard Accessories. However, the PCB Adapter Kit does not include its own documentation so its features will be documented in this User’s Guide. The PCB Adapter sockets are designed to solder into a printed circuit board (PCB) as test points to minimize ground inductance and maximize signal fidelity.

The recommended PCB layout is shown in Figure 7. The PCB socket is compatible with hand soldering and reflow processes. After soldering the socket - both the signal contact and ground contact - to the board, simply insert the probe. The PCB adapter is compatible with either the rigid or spring-loaded probe tip.

Figure 7 Recommended PCB Layout

Keysight N2870A-Series and N2894A Passive Probes User’s Guide

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Available Accessories

Accessories in Kits

The available accessories shown in this picture are listed in Table 3 on page 19 with their associated accessory kits.

Available Accessories

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Available Accessories

Keysight N2870A-Series and N2894A Passive Probes User’s Guide

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Table 3 Accessory Quantity in Kits

Available Accessories

Optional Accessory N2877A

Deluxe Kit

N2879A Fine Pitch Kit

N2878A General Purpose Kit

N2885A PCB Socket Adapter Kit

Accessory P/N

IC Cap 2.5 - 0.5 mm green 3 3 1 — 0960-2983

IC Cap 2.5 - 0.65 mm blue 3 3 1 — 0960-2984

IC Cap 2.5 - 0.8 mm gray 3 3 1 — 0960-2988

IC Cap 2.5 - 1.0 mm brown 3 3 1 — 0960-2989

IC Cap 2.5 - 1.27 mm black 3 3 1 — 0960-2986

Insulating Cap 2.5 mm 1 1 1 — 0960-2985

Protection Cap 2.5 mm 1 1 1 — 0960-2996

LF Compensation Trimmer Tool 1 — — — —

HF Compensated Ground Lead 22 cm 1 — — — 0960-2993

Ground Lead 22 cm to 4 mm banana plug 1 — — — —

Ground Lead 22 cm to 2 mm banana plug 1 — — — —

Ground Lead 11 cm to miniclip 1 — — — 0960-2977

Ground Lead 11 cm to 0.8 mm socket 1 — — — 0960-2978

Ground Spring 2.5 mm 3 3 — — 0960-2980

Self-adhesive Cu-pads

10 10 10 — 0960-2908

(2 x 2 cm)

Ground Blade 2.5 mm 3 3 1 — 0960-2982

Ground Lead 2.5 to mini Alligator Clip 1 — — — 0960-2991

Ground Lead 2.5 to 0.8 mm socket 1 — — — 0960-2994

Set of 5 Spring Tips Gold-plated 0.5 mm 1 1 1 — 0960-2981

Set of 5 Solid Tips CuBe 0.5 mm 1 1 1 — 0960-2979

Adapter 2.5 to 2 mm banana plug 1 — — — —

Adapter 2.5 to 0.8 mm socket 2 — — — 0960-2990

Dual Adapter 2.5 to 0.8 mm sockets 2 2 — — 0960-2898

Keysight N2870A-Series and N2894A Passive Probes User’s Guide

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Available Accessories

Optional Accessory N2877A

Deluxe Kit

N2879A Fine Pitch Kit

N2878A General Purpose Kit

N2885A PCB Socket Adapter Kit

Accessory P/N

Sprung Hook 2.5 mm 1 — 1 — 0960-2905

Short Sprung Hook 2.5 mm 1 — — — 0960-2907

Adapter 2.5 to 4 mm banana plug 1 — — — —

Pico Hook black 2 2 — — —

Pico Hook red 2 2 — — —

BNC Adapter 2.5 mm 1 — — — 0960-2987

PCB Adapter Kit 2.5 mm 1 10 — 25 —

QFP IC-Clips 13 mm long down o 0.5 mm

22——0960-2992

pitch (1 pair yellow/green)

QFP IC-Clips short down to 0.5 mm pitch

22——0960-2995

(1 pair yellow/green)

Ground Lead 15 cm 1 — 1 — 0960-2906

Channel Identification Rings, 4 colors 3 — 3 — —

2-leg Probe Positioner 1 1 — — N2786-6000

Micro SMD Clip 12———

Keysight N2870A-Series and N2894A Passive Probes User’s Guide

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Other Individually Orderable Accessories

This section lists the accessories that are not included with the accessory kits mentioned in the previous section but can be ordered individually.

Table 4 Other Individually Orderable Accessories

Model Number Description For use with Qty per kit

Available Accessories

N4829A Probe tip kit (Rigid and

spring loaded)

N4831A Sprung hook tip N2870A-76A, N2894A

N4836A Dual lead adapter

2.5mm, 10cm

N4837A Ground lead, 15cm N2870A-76A, N2894A

N4838A Ground Spring, 2.5 mm N2870A-76A, N2894A

N4863A 2.5 mm probe

tip-to-PCB adapter, horizontal

N4864A 2.5 mm probe

tip-to-PCB adapter, vertical

N2870A-76A, N2894A passive probe

passive probe

N2870A-76A, N2894A passive probe

passive probe

N2870A-76A, N2894A passive probe

10 each

Keysight N2870A-Series and N2894A Passive Probes User’s Guide

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Available Accessories

N4863A Horizontal PCB Adapter Dimensions

All dimensions shown in the above figure are in millimeters [inches]

Keysight N2870A-Series and N2894A Passive Probes User’s Guide

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N4864A Vertical PCB Adapter Dimensions

All dimensions shown in the above figure are in millimeters [inches]

Drill and Solder Layout of N4863/4A

Available Accessories

All dimensions shown in the above figure are in millimeters [inches]

Keysight N2870A-Series and N2894A Passive Probes User’s Guide

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Characteristics and Specifications

This section lists the characteristics and specifications for the probes. The probe and 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.

Table 5 Electrical Characteristics

Description Characteristic

Attenuation ratio N2870A: 1:1

N2871A: 10:1 N2872A: 10:1 N2873A: 10:1 N2874A: 10:1 N2875A: 20:1 N2876A: 100:1 N2894A: 10:1

Bandwidth (-3 dB) N2870A: 35 MHz

N2871A: 200 MHz N2872A: 350 MHz N2873A: 500 MHz N2874A: 1.5 GHz N2875A: 500 MHz N2876A: 1.5 GHz N2894A: 700 MHz

Probe Risetime (10%-90%) N2870A: 10 ns

N2871A: 1.4 ns N2872A: 1.0 ns N2873A: 700 ps N2874A: 240 ps N2875A: 700 ps N2876A: 240 ps N2894A: 500 ps

Maximum Rated Input Voltage N2870A: 55 V CAT II

N2871A: 400 V CAT I N2872A: 400 V CAT Ib, 300 V CAT II N2873A: 400 V CAT Ib, 300 V CAT II N2874A: 8.5 V CAT I N2875A: 400 V CAT Ib, 300 V CAT II N2876A: 21 V CAT I N2894A: 400 V CAT Ib, 300 V CAT II

, 300 V CAT II

Keysight N2870A-Series and N2894A Passive Probes User’s Guide

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Description Characteristic

Characteristics and Specifications

Input Resistance (scope + probe)

Input Capacitance (system) N2870A: 39 pF (+ scope)

Compensation Range N2870A: —

N2870A: 1 M N2871A: 10 M N2872A: 10 MΩ N2873A: 10 MΩ N2874A: 500 Ω N2875A: 20 M N2876A: 5 KΩ N2894A: 10 MΩ

N2871A: 9.5 pF N2872A: 9.5 pF N2873A: 9.5 pF N2874A: 1.8 pF N2875A: 5.6 pF N2876A: 2.2 pF N2894A: 9.5 pF

N2871A: 10 - 25 pF N2872A: 10 - 25 pF N2873A: 10 -25 pF N2874A: — N2875A: 7 - 20 pF N2876A: — N2894A: 10 - 25 pF

Input Coupling of the Measuring Instrument N2870A: 1 MΩ

N2871A: 1 MΩ N2872A: 1 MΩ N2873A: 1 MΩ N2874A: 50 Ω N2875A: 1 MΩ N2876A: 50 Ω N2894A: 1 MΩ

a 700 MHz bandwidth available with InfiniiVision 4000X/6000X with 1 GHz or higher band-

width models only b Measurement Category I, 1250 V transient overvoltage cMeasurement Category II d Measurement Category I, 0 V transient overvoltage

Keysight N2870A-Series and N2894A Passive Probes User’s Guide

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Characteristics and Specifications

WARNING

Table 6 Mechanical Characteristics

Description Characteristic

Weight (probe only) 48 g

Cable Length 1.3 m

Probe Barrel Diameter 2.5 mm

Table 7 Environmental Specifications

Description Specification

Temperature Operating: 0 °C to +50 °C

Altitude Operating: 2,000 m (6,561 ft)

Non-operating: -40 °C to +70 °C

Non-operating: 15,000 m (49,212 ft)

Humidity Operating: 80% room humidity for temperatures up to 31 °C, decreasing linearly

to 40% at 50 °C Non-operating: 95% room humidity for temperatures up to 40 °C

Pollution Degree Pollution Degree 2

Table 8 Safety Specifications

Specification

Low Voltage Directive 2006/95/EC

CEI/IEC 61010-031:2008-08

Typical Voltage Derating for Each Probe Model (Measurement Category I)

The maximum input voltage rating of the probe decreases as the frequency of the applied signal increases.

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Characteristics and Specifications

CAUTION

Figure 8 Typical Voltage Derating Plot

Refer to the oscilloscope documentation for the oscilloscope’s acceptable input range and do not exceed this limit when using the probes.

Typical Input Impedance for Each Probe Model

Refer to the oscilloscope documentation for the oscilloscope’s acceptable input range and do not exceed this limit when using the probes.

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Characteristics and Specifications

CAUTION

The input impedance of the probe decreases as the frequency of the applied signal increases.

Figure 9 Typical Input Impedance

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Performance Verification Procedures

The two procedures in this section are used to test and verify the DC attenuation ratio and the input resistance of the probes. The recommended test interval is once a year or as required. Use the equipment listed in Table 9 to complete the procedures.

Table 9 Required Test Equipment

Description Minimum Requirements Part Number

Digital Multimeter (DMM) 6.5 digits of resolution, resistance ± 1% Keysight 34401A

Calibrator DC Voltage 0 to ±1100 V Fluke 5700A

BNC(m) to BNC(f) 50Ω feedthrough termination

Modified deskew and performance verification kit, 1 MΩ ±

0.1% precision shunt resistor is soldered between 50 Ω trace and ground

Oscilloscope If testing N2870/1/2/3/4A or N2894A: 1 MΩ

input impedance

If testing N2874/6A: 50 Ω input impedance

Test DC Attenuation Ratio

1 Set the DMM (Keysight 34401A) to DC voltage measurement mode. Configure

the input resistance to > 10 G

Ω. Short the tip and perform the “Null” function.

Set the calibrator (Fluke 5700A) to 10V. 2 Connect the N287XA probe tip to the calibrator HI output. 3 Connect the N287XA probe ground lead to the calibrator LO output.

Keysight 11048C

Keysight E2655B

Keysight 4000-X Series

4 For models N2874A and N2876A, connect the probe output to the 50Ω

feedthrough termination (11048C). Connect the output of the 11048C to the

DMM. For all other models, connect the probe output to the modified Keysight

PV fixture 50

precision resistor. Connect the output of the 50

Keysight N2870A-Series and N2894A Passive Probes User’s Guide

Ω trace input. The trace is terminated with the 1 MΩ ± 0.1%

Ω trace to the DMM.

Page 30

Performance Verification Procedures

5 Verify that the measured value is between the limits listed in the table below for

each output signal. If it is then the attenuation ratio has an error within ±2%.

Table 10 Measurement Limits

Model Target Value Measured Value

N2870A x1 10V ± 200 mV

N2871A x10 1V ± 20 mV

N2872A x10 1V ± 20 mV

N2873A x10 1V ± 20 mV

N2874A x10 1V ± 20 mV

N2875A x20 500 mV ± 10 mV

N2876A x100 100 mV ± 2 mV

N2894A x10 1V ± 20 mV

Test Input Resistance

1 Turn on the DMM. Short the DMM probes and run the “Null” function. 2 Connect the DMM probes to the probe tip and the ground at the tip of the

probe.

3 Connect the probe’s output to one of the oscilloscope’s input channels. Set the

oscilloscope’s input impedance value according to the following table.

Keysight N2870A-Series and N2894A Passive Probes User’s Guide

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Performance Verification Procedures

Error %

Measured Value Target Value–

Target Value

-----------------------------------------------------------------------------

100×=

Table 11 Oscilloscope’s Input Impedance

Model Oscilloscope Input Impedance

N2870A 1 M

N2871A 1 MΩ

N2872A 1 MΩ

N2873A 1 MΩ

N2874A 50Ω

N2875A 1 MΩ

N2876A 50Ω

N2894A 1 MΩ

4 Set up the DMM to measure resistance. Record the resistance into the

Measured Value column in Table 12 on page 31. Calculate the Error%. It should

be less than 1%.

Table 12 DMM Measurements

Model Target Value Measured Value Error%

N2870A 1 MΩ

N2871A 10 MΩ

N2872A 10 MΩ

N2873A 10 MΩ

N2874A 500Ω

N2875A 20 MΩ

N2876A 5 kΩ

N2894A 10 MΩ

Keysight N2870A-Series and N2894A Passive Probes User’s Guide

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Performance Verification Test Record

Keysight Technologies N287XA/N2894A Passive Probe

Serial No.:_______________________ Test Date:_________________ Tested By:_______________________

Recommended Test Interval: 1 Year Recommended Date of Next Test:_________ Test Temperature:_____________________

Test Probe Model Limits Results

Attenuation Ratio

Input Resistance

N2870A 10V ± 200 mV

N2871A 1V ± 20 mV

N2872A 1V ± 20 mV

N2873A 1V ± 20 mV

N2874A 1V ± 20 mV

N2875A 500 mV ± 10 mV

N2876A 100 mV ± 2 mV

N2894A 1V ± 20 mV

Error% < ± 1%

Page 33

IEC Measurement Category Definitions

Definitions and Examples (Clause 6.5.2).

Measurement Category I (CAT I)

Measurement category I is for measurements performed on circuits not directly connected to a mains supply.

Example

Measurements in circuits not derived from a mains supply and specially protected (internal) circuits derived from a mains supply. In the latter case, transient stresses are variable. For that reason, it is required that the transient withstand capability of the equipment is made known to the user.

Measurement Category II (CAT II)

IEC Measurement Category Definitions

Measurement category II is for measurements performed on circuits directly connected to the low voltage installation.

Example

Household appliances, portable tools, and similar equipment.

Measurement Category III (CAT III)

Measurement category III is for measurements performed in the building installation.

Example

Measurements on distribution boards, circuit breakers, wiring including cables, bus-bars, junction boxes, switches, socket-outlets in the fixed installation and equipment for industrial use like, for example, stationary motors with permanent connections to the fixed installation.

Measurement Category IV (CAT IV)

Measurement category IV is for measurements performed at the source of the low-voltage installation.

Example

Electricity meters and measurements on primary over-current protection devices and ripple control units.

Keysight N2870A-Series and N2894A Passive Probes User’s Guide

Page 34

IEC Pollution Degrees Definitions

Definitions (Clause 3.5.6).

Pollution Degree 1

No POLLUTION or only dry, non-conductive POLLUTION. NOTE: The POLLUTION has no influence.

Pollution Degree 2

Only non-conductive POLLUTION. Occasionally, however, a temporary conductivity caused by condensation must be accepted.

Pollution Degree 3

Conductive POLLUTION occurs or dry, non-conductive POLLUTION occurs which becomes conductive due to condensation which is to be expected.

Keysight N2870A-Series and N2894A Passive Probes User’s Guide

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Keysight N2870A-Series and N2894A Passive Probes User’s Guide

Page 36

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