Keysight Technologies N2797A User Manual

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Keysight N2797A Extreme Temperature Single-Ended Active Probe

User’s Guide

Notices

CAUTION

WARNING

No part of this manual may be reproduced in any form or by any means (including electronic storage and retrieval or translation into a foreign language) without prior agreement and written consent from Keysight Technologies, Inc. as governed by United States and international copyright laws.

Manual Part Number

N2797-97000

Edition

Second edition, October 2014

Published by: Keysight Technologies, Inc. 1400 Fountaingrove Parkway Santa Rosa, CA, 95403

Warranty

The material contained in this document is provided “as is,” and is subject to being changed, without notice, in future ed itions. Further, to the maximum extent permitted by applicable law, Keysight disclaims all warranties, either express or implied, with regard to this manual and any information contained herein, incl uding but not l imited to the implied warranties of merchantability and fitness for a particular purpose. Keysight shall not be liable for errors or for incidental or consequential damages in connection with the furnishing, use, or performance of this document or of any information contained herein. Should Keysight and the user have a separate written agreement with warranty terms covering the material in this document that conflict with these terms, the warranty terms in the separate agreement shall control.

Technology Licenses

The hardware and/or software described in this document are furnished under a license and may be used or copied only in accordance with the terms of such license.

Restricted Rights Legend

If software is for use in the performance of a U.S. Government prime contract or subcontract, Software is delivered and licensed as “Commercial computer software” as defined in DFAR 252.227-7014 (June 1995), or as a “commercial item” as defined in FAR 2.101(a) or as “Restricted computer software” as defined in FAR 52.227-19 (June 1987) or any equivalent agency regulation or contract clause. Use, duplication or d isclosure of Software is subject to Keysight Technologies’ standard commercial license terms, and non-DOD Departments and Agencies of the U.S. Government will receive no greater than Restricted Rights as defined in FAR

52.227-19(c)(1-2) (June 1987). U.S. Government users will receive no greater than Limited Rights as defined in FAR 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 resul t in personal injury or death. Do not proceed beyond a WARNING notice until the indicated conditions are fully understood and met.

2 N2797A User’s Guide

1Using the Probe/5

Probe Features / 7 Using the Accessory Tips and Grounds / 14 Dynamic Range and Offset Voltage Limitations / 20 Functional Test / 21 Inspecting the Probe / 22 Cleaning the Probe / 22 Returning the Probe for Service / 23 Safety Information / 24

2Probe Calibration/27

Calibrating the Probe on Infiniium Oscilloscopes / 28 Calibrating the Probe on InfiniiVision Oscilloscopes / 30

3 Characteristics and Specifications / 31

Dimensions / 33

4Performance Data Plots/35

5 Performance Verification / 37

Test 1. DC Input Resistance / 39 Test 2. Bandwidth / 40 Performance Test Record / 46

Index

N2797A User’s Guide 3

Contents

4 N2797A User’s Guide

Keysight N2797A

WARNING

User’s Guide

1 Using the Probe

Probe Features 7 Using the Accessory Tips and Grounds 14 Dynamic Range and Offset Voltage Limitations 20 Functional Test 21 Inspecting the Probe 22 Cleaning the Probe 22 Returning the Probe for Service 23 Safety Information 24

The N2797A single-ended active probe is designed to be used in extreme temperatures environments. With a 2 meter cable and ability to operate in temperatures from –40°C to +85°C, the N2797A probe is ideal for environmental labs. The probe’s bandwidth is 1.5 GHz.

The N2797A integrates many of the characteristics needed for today’s general-purpose, high-speed probing, especially in digital system design, component design/characterization, and educational research applications. Its 1 M and extremely low input capacitance (1 pF) provide ultra low loading of the device under test. This, accompanied with superior signal fidelity, makes this probe useful for most of today’s digital logic voltages. With a wide ±8V dynamic range and ±12V offset range, this probe can be used in a wide variety of applications.

Ω input resistance

For high signal integrity probing, the N2797A 1.5 GHz active probe is a perfect complements to Keysight’s 500 MHz – 600 MHz and 1 GHz bandwidth scopes.

The probe is powered directly by the InfiniiVision and Infiniium AutoProbe interface, eliminating the need for an additional power supply. The probe also come with a number of accessories that allow for easy connections to the circuit under test. Refer to “Supplied

Accessories" on page 8.

Handle the probe with care to avoid injury, especially when it is fitted with the sharp spring or rigid tip.

1 Using the Probe

CAUTION

This probe is an ESD sensitive devices, particularly at the probe tips. Follow standard ESD precautions when handling. Remove tip accessories when storing the probe.

Before using the probe, refer to “Safety Information" on page 24.

Handle the probe cable carefully to avoid damaging it through excessive bending or pulling. Avoid any mechanical shocks to the probe in order to guarantee accurate performance and protection.

6 N2797A User’s Guide

Probe Features

NOTE

Oscilloscope Compatibility

The N2797A probe is compatible with the Keysight oscilloscopes shown in Tab le 1 . Up to four probes can be connected to the oscilloscope. The table also lists the minimum required firmware version for the oscilloscope.

The N2797A probe is designed for oscilloscopes with 1 MW AutoProbe-interface channel inputs.

Is Your Oscilloscope Software Up-to-Date? Keysight periodically releases software updates to support your probe, fix known defects, and incorporate product enhancements. To download the latest firmware, go to www.keysight.com and search for your oscilloscope’s topic. Click on the “Drivers, Firmware & Software” tab.

Table 1 Compatible Oscilloscopes and Support

Using the Probe 1

Oscilloscope Adapter Required

Infiniium Oscilloscopes (firmware version ¡3.50 or above)

90000 Q-Series N5442A

90000 X-Series N5442A

90000A —

9000 H-Series —

9000A-Series —

InfiniiVision Oscilloscopes (firmware version ¡2.11 or above)

4000 X-Series —

3000 X-Series —

N2797A User’s Guide 7

1 Using the Probe

CAUTION

Probe Headlight

The probe is equipped with a white LED headlights to illuminate the area around the probe tip. This headlight has a fixed intensity and is turned on and off by pressing the button that is located on the probe’s body.

Figure 1 Headlights and Button

Channel-Identification Rings

When multiple probes are connected to the oscilloscope, the channel identification rings (yellow, green, blue, and purple) allow you to quickly determine which channel input is associated with each probe. On the probe, place one colored ring near the probe’s channel connector and place an identical color ring near the probe head.

Supplied Accessories

The probe comes with the accessories shown in Figure 2.

All of the supplied accessories can be used at the probe’s specified extreme temperature range of –40°C to +85°C (–40°F to +185°F) except the flex nose clip and pico hook tips. These adapters have a slightly reduced temperature range of –20°C to +80°C (–4°F to +176°F).

8 N2797A User’s Guide

Using the Probe 1

Figure 2 Accessories Supplied With the Probe (Not to Scale)

N2797A User’s Guide 9

1 Using the Probe

Table 2 Supplied Accessories

Accessory

Ambient Operating Temperature Quantity

Flex Nose Clip (red) –20°C to +80°C

Flex Nose Clip (black) 2

Pico Hook (red) 1

Pico Hook (black) 1

Rigid Probe Tip Same as probe

Solderable Tip (0.97 mm square) 10

Ground Blade 2

Y-Lead Adapter, long with damping resistor (9 cm) 2

Y-Lead Adapter, short with damping resistor (6 cm) 2

Right-Angle Ground (5 cm) 2

(–4°F to +176°F)

–20°C to +85°C (–4°F to +185°F)

Available Accessories

Tabl e 3 shows the replacement accessories available in the N2798A replacement accessory

kit. The table lists the ambient operating temperatures for each accessory. Those accessories that have the same temperature range as the probe are marked “extreme temp”.

Tabl e 4 shows additional accessories that work with the probe, but are not provided with

the probe. Notice that most of these accessories can not be used at extreme temperature range of the probe.

10 N2797A User’s Guide

Table 3 Replacement Accessory Kit (N2798A)

Using the Probe 1

Item Description

Solderable Tip, extreme temp Same as probe

Ground Blade, extreme temp 2 5061-7393

Rigid Probe Tip, extreme temp 5 5061-7389

Flex Nose Clips This adapter has a slightly reduced temperature range compared to the probe.

Pico Hook Nose Clips This adapter has a slightly reduced temperature range compared to the probe.

Long Y-Lead Adapter with damping resistor (10 cm), extreme temp

Short Y-Lead Adapter with damping resistor (5 cm), extreme temp

Ambient Operating Temperature

–40°C to +85°C (–40°F to +185°F)

–20°C to +80°C (–4°F to +176°F)

Same as probe –20°C to +85°C (–4°F to +185°F)

Kit Part

Qty

10 5061-7385

2 (red) 2 (black)

1 (red) 1 (black)

2 5061-7386

2 5061-7387

Number

5061-7390 (red) 5061-7391 (black)

—

Right Angle Ground (5 cm), extreme temp Same as probe

–40°C to +85°C (–40°F to +185°F)

2 5061-7384

N2797A User’s Guide 11

1 Using the Probe

Table 4 Additional Available Accessories

Item Description

Spring Probe Tip, extreme temp 2 5061-7388

Long Y-Lead Adapter(10 cm) 0°C to 50°C

Right Angle Ground (10 cm) 0°C to 50°C

Right Angle Ground (5 cm) 2 5061-7399

Ground Lead (6 cm) 0°C to 50°C

Ground Lead (12 cm) 2 5061-7396

Offset Ground 0°C to 50°C

N2787A 3D Probe Positioner Not Specified — —

Ambient Operating Temperature Qty

1 5061-7392

(32°F to 122°F)

2 5061-7400

(32°F to 122°F)

2 5061-7395

(32°F to 122°F)

2 5061-7394

(32°F to 122°F)

Kit Part Number

12 N2797A User’s Guide

Attaching Probe Accessories

It’s easy to change the probe tip and ground accessories. Figure 3 shows locations for inserting the tip and the ground accessory. To change an accessory, gently pull it straight out of its contact socket along the axis of the probe. Once the accessory is removed, insert the new accessory until it is seated in the contact socket. In order to insert the probe tip completely into the housing, carefully press the probe tip against a hard surface.

Figure 3 Tip and Grounding Connections

Using the Probe 1

N2797A User’s Guide 13

1 Using the Probe

Using the Accessory Tips and Grounds

This section presents the various probe accessory configurations listed in order of available bandwidth for your measurements. Select the configuration to match your measurement needs, including ease of use.

Table 5 Probe Configuration in Order of Decreasing Bandwidth

Recommended Order of Use Probe Configuration Topic

1 “Rigid or Solderable Tip with Ground Blade" on page 15 1.5 GHz

2 “6 cm Y-Leads with 0.1” Headers" on page 16 1.0 GHz

3 “Solderable Tip with Right-Angle Ground" on page 17 800 MHz

4 “9 cm Y-Leads with 0.1” Headers" on page 18 800 MHz

5 “Y-Lead with Flexible Nose Clips and

Pico Hooks" on page 19

Typical Band wid th

500 MHz

14 N2797A User’s Guide

Rigid or Solderable Tip with Ground Blade

WARNING

The combination of rigid or solderable tip and ground blade provide the highest bandwidth of any combination of accessory tips and grounds. Use this configuration at room temperatures where hand probing is possible or at extreme temperatures when using a probe positioner that can withstand the required temperature. The bandwidth with accessory is 1.5 GHz.

Handle the probe with care to avoid injury, especially when it is fitted with the sharp rigid or spring tip.

Using the Probe 1

N2797A User’s Guide 15

When inserting the tip, insert the end with the ridge into the probe head as shown in

Figure 4.

Figure 4 Inserting the Rigid Tip

1 Using the Probe

6 cm Y-Leads with 0.1” Headers

The short 6 cm long Y-leads offer a convenient and reliable method to connect both the probe signal and ground to probe points on the board via or the solderable pins that are provided with each probe. The sockets accept 0.56 to 0.86 mm round and

0.64 mm square (0.022 to 0.034 inch round and 0.025 inch square) diameter pins. The maximum insertion depth is 7.5 mm (0.295 inch) and the outer insulation of the socket is less than

2.54 mm. You can use it for 2.54 mm pitch (0.1 inch) terminals. The bandwidth with accessory is 1.0 GHz.

Figure 5 Probe with Y-Leads Attached

16 N2797A User’s Guide

Solderable Tip with Right-Angle Ground

NOTE

The solderable pin and right-angle ground provide hands free probing at extreme temperatures. Solder the tip on the printed-circuit board as shown in

Figure 6 and then slip the probe onto the free end of the solderable pin. The

bandwidth with accessory is 800 MHz.

The longer right-angle ground lead introduces increased inductance in the ground path. Therefore, keep the right-angle ground lead as straight as possible for maximum measurement bandwidth. Loops and bends in the ground lead, as shown in this picture, can reduce the measurement band wid th.

Using the Probe 1

Figure 6 Placing the Probe Onto the Solderable Tip

N2797A User’s Guide 17

1 Using the Probe

9 cm Y-Leads with 0.1” Headers

Like the 6 cm Y-leads, the 9 cm Y-leads offer a convenient and reliable method to connect both the probe signal and ground to probe points on the board via or the solderable pins that are provided with each probe. The added convenience of the longer leads results in a slightly reduced bandwidth. The bandwidth with accessory is 800 MHz.

The sockets accept 0.56 to 0.86 mm round and 0.64 mm square (0.022 to 0.034 inch round and 0.025 inch square) diameter pins. The maximum insertion depth is 7.5 mm (0.295 inch) and the outer insulation of the socket is less than 2.54 mm. You can use it for 2.54 mm pitch (0.1 inch) terminals.

Figure 7 Probe with Y-Leads Attached

18 N2797A User’s Guide

Y-Lead with Flexible Nose Clips and Pico Hooks

CAUTION

You can use flexible nose clips and Pico hook clips to make connections to components or wires with leads that are 1.01 mm (0.04 inches) in diameter or smaller. With today’s miniature IC- and component-packaging techniques, these clips can make probing challenging devices much easier. The bandwidth with accessory is 500 MHz.

Figure 8 Flexible Nose and Pico Hook Clips

Most users prefer to attach the clips to the probe via the Y-lead adapter as shown in the picture below. Press the back of the clip to extend the grasping hook and then release to tighten the hook around the component you are testing.

Using the Probe 1

The clips have an ambient operating temperature range of –20°C to +80°C (–4°F to +176°F). This is a slightly reduced range compared to the probe.

Figure 9 Probe with Flexible Nose Clips Attached

N2797A User’s Guide 19

1 Using the Probe

Dynamic Range and Offset Voltage Limitations

With the 16Vpp (±8V) of dynamic range and ±12V of offset range, the probes have a wide measuring range of ±20V, which allows them to be used for a wide variety of applications. For example, if you wanted to measure small AC noise riding on top of a +10V DC signal, you could use DC offset to position the signal at the center of the screen to keep the probe within its dynamic range. You could then zoom in to see the detail at a higher resolution. Trying to measure a signal out of the dynamic range may result in a clipped or distorted waveform.

Figure 10 Dynamic Range and Offset Limits

20 N2797A User’s Guide

Functional Test

Use the following generic measurement procedure to ensure that your probe is functioning properly.

1 Connect the probe to an oscilloscope channel input and ensure the input impedance of the

oscilloscope matches the output impedance of the probe (50W).

2 Connect a grounding accessory to the probe and connect the ground to the ground

terminal on the oscilloscope.

3 Connect the probe tip to the oscilloscope’s probe compensation output. 4 Enable autoscale on the oscilloscope. 5 A square wave should now be displayed on the oscilloscope, if the probe is functioning

properly.

Using the Probe 1

N2797A User’s Guide 21

1 Using the Probe

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 probe.

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 from the oscilloscope and clean the probe 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.

22 N2797A User’s Guide

Returning the Probe for Service

NOTE

If the probe is found to be defective we recommend sending it to an authorized service center for all repair and calibration needs. Perform the following steps before shipping the probe back to Keysight Technologies for service.

1 Contact your nearest Keysight sales office for information on obtaining an RMA number and

return address.

2 Write the following information on a tag and attach it to the malfunctioning equipment.

• Name and address of owner

• Product model number (for example, N2797A)

• Product Serial Number (for example, MYXXXXXXXX)

• Description of failure or service required

Include probing and browsing tips if you feel the probe is not meeting performance specifications or a yearly calibration is requested.

3 Protect the probe by wrapping in plastic or heavy paper. 4 Pack the probe in the original carrying case or if not available use bubble wrap or packing

peanuts.

5 Place securely in sealed shipping container and mark container as "FRAGILE".

Using the Probe 1

If any correspondence is required, refer to the product by serial number and model number.

Contacting Keysight Technologies

For technical assistance, contact your local Keysight Call Center.

• In the Americas, call 1 (800) 829-4444

• In other regions, visit http://www.keysight.com/find/assist

Before returning an instrument for service, you must first call the Call Center at 1 (800) 829-4444.

N2797A User’s Guide 23

1 Using the Probe

WARNING

Safety Information

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 the probe with care to avoid injury, especially when it is fitted with the sharp spring or rigid tip.

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

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.

24 N2797A User’s Guide

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 found in this manual.

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

Using the Probe 1

WARNING

CAUTION

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.

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. Avoid any mechanical shocks to this product in order to guarantee accurate performance and protection.

N2797A User’s Guide 25

1 Using the Probe

26 N2797A User’s Guide

Keysight N2797A

CAUTION

User’s Guide

2 Probe Calibration

Calibrating the Probe on Infiniium Oscilloscopes 28 Calibrating the Probe on InfiniiVision Oscilloscopes 30

Always calibrate the probe before making any critical measurements. A probe calibration removes attenuation errors, offset errors, and timing delays that are introduced by the probe. This chapter contains basic calibration procedures for both Infiniium and InfiniiVision oscilloscopes. For additional information on the probe calibration refer to the oscilloscope’s user documentation.

Always wear an ESD wrist strap when working with active probes. Not doing so can result in the probe becoming permanently damaged.

2 Probe Calibration

Calibrating the Probe on Infiniium Oscilloscopes

Probe calibrations vary slightly between series 9000, 90000, and 90000 X oscilloscopes. For 9000 series oscilloscopes, the following calibrations are used:

• Skew Calibration

• Attenuation/Offset Calibration

For 90000 series oscilloscopes, the following calibrations are used:

• DC Attenuation/Offset Calibration

• Skew Calibration

When performing a the skew calibration, the E2655B Performance Verification (PV) and deskew fixture is used. The PV fixture is included with the Deskew Kit which is shipped with Infiniium oscilloscopes. The fixture is also used in the performance verification procedure that is documented in Chapter 5, “Performance Verification".

An optional N2787A 3D Probe Positioner or equivalent can be used to hold the probe during the calibration.

Procedure

1 Turn on the oscilloscope. Allow the oscilloscope and probe to warm up for 20 minutes

before performing the probe calibrations.

2 If the oscilloscope needs calibration, perform a user calibration before the probe

calibration. On the oscilloscope, click Utilities > Calibration.

3 On the oscilloscope, click Setup > Probes. 4 In the Probe Calibration dialog box, select the tab representing the channel that has the

probe attached.

5 In the dialog box, select the probe head and the type of calibration. Click Start and follow

the instructions shown on the oscilloscope.

6 When performing the skew calibration, you will be instructed to use the PV fixture. Observe

these points:

• Connect the PV fixture’s input to the oscilloscope’s calibration output as shown in

Figure 11 on page 29. Connect a 50 ohm terminator to the PV’s output.

28 N2797A User’s Guide

Probe Calibration 2

CAUTION

NOTE

Figure 11 E2655B PV Fixture with 50 Ohm Termination

• Position the probe so that the signal lead touches the PV fixture’s center conductor next to the dialectric area. The ground lead should touch the PV fixture’s ground plane. On 90000 X-series oscilloscopes, use an N5442A adapter when instructed to connect the probe to one of the oscilloscope’s channel inputs.

To avoid damaging the oscilloscope’s Cal Out connector, do not apply force to the PV fixture. Light probe contact is all that is needed for the calibration.

N2797A User’s Guide 29

NEVER solder a probe tip to the thick-film gold. The gold will immediately dissolve into the solder and disappear.

If you are using the browser tip, it is recommended that you use the N2787A 3D Probe Positioner to hold the probe in place.

You can check that the probe leads are correctly connected by pressing the front panel autoscale button. A stable step should be shown on the screen. Pressing autoscale will close the Probe Calibration dialog box.

2 Probe Calibration

NOTE

Calibrating the Probe on InfiniiVision Oscilloscopes

Allow the oscilloscope and probe to warm up for 20 minutes before performing the probe calibration.

Procedure

1 Connect the probe to one of the oscilloscope channels.

When you connect the probe, the Calibrate Probe softkey in the Channel Probe Menu becomes active.

2 Connect the probe to the calibration terminals. On 3000 X-series oscilloscopes, connect

the probe’s signal tip to the front-panel Demo 2 / Probe Comp terminal and the ground tip to the ground terminal.

Figure 12 Probe Calibration Terminals on 3000 X-Series Oscilloscope

3 Press the Channel on/off key to turn the channel on (if the channel is off). 4 In the Channel Menu, press the Probe softkey. 5 Press the Calibrate Probe softkey and follow the instructions on the display.

30 N2797A User’s Guide

Keysight N2797A

User’s Guide

3 Characteristics and

Specifications

This chapter provides the characteristics and specifications for the N2797A active probe. 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 6 Mechanical Characteristics

Parameter Characteristic

Probe Weight 108g (approximate)

Cable Length 2m

Table 7 Environmental Specifications

Parameter Characteristic

Ambient Operating Temperature –40°C to +85°C (–40°F to +185°F)

Ambient Non-Operating Temperature –40°C to +85°C (–40°F to +185°F)

Operating Humidity 95% RH at +40°C

Non-Operating Humidity 95% RH at +65°C

Operating Altitude 4,000m (13,000 ft)

ESD 8 kV HBM

3 Characteristics and Specifications

Table 8 Electrical Characteristics and Specifications

Parameter Characteristic or Specification (where indicated)

Bandwidth (–3 dB)

Rise Time (10% – 90%, calculated) 233 ps

System Bandwidth (with Keysight oscilloscope) 1 GHz (with Keysight’s 1 GHz InfiniiVision or Infiniium

Attenuation Ratio (at DC) 10:1 ± 0.5%

Input Dynamic Range –8V to +8V (DC or Peak AC)

Non-Destructive Maximum Input Voltage –20V to +20V

Offset Range ±12V

DC Offset Error (Output Zero) < ±1 mV

Flatness (at 25° C) Typical 0.3 dB (10 Hz – 100 MHz)

Flatness Over Temperature (–40° C to +85° C) Typical 0.3 dB (10 Hz – 100 kHz)

Input Resistance

1.5 GHz (specification)

oscilloscope)

Typical 0.8 dB (100 MHz – 1 GHz) Typical 2.0 dB (1 GHz – 1.5 GHz)

Typical 0.6 dB (100 kHz – 100 MHz) Typical 0.8 dB (100 MHz – 500 MHz) Typical 2.0 dB (500 MHz – 1 GHz) Typical 2.5 dB (1 GHz – 1.5 GHz)

1 MΩ ± 3% (specification)

Input Capacitance 1 pF

Probe Noise < 2.5 mV

(referred to input)

rms

Output Impedance 50Ω

Internal Power Keysight AutoProbe interface from oscilloscope

(InfiniiVision and Infiniium)

a Denotes warranted electrical specification at 25 °C room temperature after 20 minute warm-up. All others are typical.

32 N2797A User’s Guide

WEEE Compliance

Dimensions

Characteristics and Specifications 3

This symbol indicates the Environmental Protection Use Period (EPUP) for the product’s toxic substances for the China RoHS requirements.

The CE mark is a registered trademark of the European Community. ISM GRP 1-A denotes the instrument is an Industrial Scientific and Medical Group 1 Class A product. ICES/NMB-001 indicates product compliance with the Canadian Interference-Causing Equipment Standard.

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.

N2797A User’s Guide 33

3 Characteristics and Specifications

34 N2797A User’s Guide

Keysight N2797A

User’s Guide

4 Performance Data Plots

Figure 13 shows the frequency response for the spring or rigid probe tip and an offset

ground or ground blade.

Figure 13 Frequency Response (Vout/Vin)

4 Performance Data Plots

Figure 14 Input Impedance Equivalent Model

Figure 15 Typical Input Impedance Plot

36 N2797A User’s Guide

Keysight N2797A

CAUTION

User’s Guide

5 Performance Verification

Test 1. DC Input Resistance 39 Test 2. Bandwidth 40 Performance Test Record 46

These procedures are used to test the warranted specifications for the N2797A. The recommended calibration test interval is once a year or as required. Use the equipment listed in Tabl e 9 on page 38.

Electrostatic discharge (ESD) can quickly and imperceptibly damage or destroy high performance probes, resulting in costly repairs. Always wear a wrist strap when handling probe components and insure that cables are discharged before being connected.

5 Performance Verification

Table 9 Required Test Equipment

Test Equipment Critical Specification Model Number

Digital Multimeter (DMM) Resistance ±1% Keysight 34401A

Vector Network Analyzer (VNA) 13 GHz sweep range full 2 port cal Option 1D5 Keysight 8720ES

Calibration Standards No Substitute Keysight 85052D

External Power Supply No Substitute Keysight 1143A

AutoProbe Interface Adapter No Substitute Keysight N1022A/B

Outside thread 3.5 mm (male) to 3.5 mm (female) adapter

Cable (2) 3.5 mil; SMA; High Quality Keysight 8120-4948

Cable 1.5 mil Probe Power Extension No Substitute Keysight 01143-61602

PV/DS Test Board No Substitute (In E2655B Kit) Keysight E2655-66503

No Substitute Keysight 5062-1247

38 N2797A User’s Guide

Test 1. DC Input Resistance

Procedure

1 Connect the DMM probes between the probe tip and ground at the tip of the probe. 2 Set up the DMM to measure resistance. The resistance should read 1 MW ± 3%. 3 Record the resistance in Table 10 on page 46.

Performance Verification 5

N2797A User’s Guide 39

5 Performance Verification

NOTE

Test 2. Bandwidth

Allow the probe to warm up for at least 20 minutes.

Using the 8720ES VNA successfully

Observe these simple guidelines when working with the 8720ES VNA during this procedure.

• Sometimes it may take a few seconds for the waveforms to settle completely. Allow time for waveforms to settle before continuing.

• Make sure all connections are tight and secure. If needed, use a vise to hold the cables and test board stable while making measurements.

• Be careful not to cross thread or force any connectors. This could be a very costly error to correct.

Procedure

Initial Setup

1 Turn on the 8720ES VNA and let warm up for 20 minutes. 2 Press the green [Preset] key on the 8720ES VNA. 3 On the VNA, press the [Power] key and set the power to 0 dBm. 4 On the VNA, press the [AVG] key and then select the Averaging Factor screen key. Set

averaging to 4.

5 On the VNA, press the [Sweep Setup] key and then press the sweep type menu screen key.

Select the log freq screen key.

6 Connect the probe under test to the AutoProbe Adapter and power the probe using the

1143A power supply as shown in Figure 16 on page 41. Install the outside thread adapter to the AutoProbe Adapter.

40 N2797A User’s Guide

Figure 16 Probe Connected to Probe Adapter (not to scale)

Calibrating a Reference Plane

Performance Verification 5

To get a reliable measurement from the VNA you must calibrate a reference plane so that the VNA knows where the probe under test is located along the transmission line.

7 On the VNA, press the [Cal] key. 8 Press the cal menu screen key. 9 Press the full 2 port screen key.

10 Connect the PV fixture to the Port 1 on the VNA using a high quality SMA cables. Connect

the cable to the pincher side of PV fixture as shown in Figure 17 on page 42.

11 The calibration reference plane is at the other end of PV fixture.

N2797A User’s Guide 41

5 Performance Verification

Figure 17 PV Fixture Connected to VNA

12 Perform a Calibration for the PORT 1 side of the Reference plane.

a Press the reflection screen key. b Connect the open end of 85052D Calibration Standard to the non-pincher side of the

PV/DS test board.

c Select the open screen key under the Forward group. d Wait until the VNA beeps indicating that it has completed the task. e Connect short end of Calibration Standard to the non-pincher side of the PV/DS test

board.

f Select short screen key under the Forward group. g Wait until the VNA beeps indicating that it has completed the task. h Connect load end of Calibration Standard to the non-pincher side of the PV/DS test

board.

i Select the loads screen key under the Forward group. j Press broadband screen key selection. k Wait until the VNA beeps indicating that it has completed the task. l Press the done loads screen key. m You have just calibrated one side of the reference plane.

13 Connect the other high quality SMA cable to the VNA’s PORT 2 as shown in Figure 18.

42 N2797A User’s Guide

Performance Verification 5

Figure 18 SMA Cable Connected to Port 2

14 Get the opposite sex of the Calibration Standards for the next step. 15 Perform Calibration for the PORT 2 side of the Reference plane.

a Press the reflection screen key. b Connect the open end of Calibration Standard to the available end of the PORT 2 SMA

cable.

c Select the open screen key under the Reverse group. d Wait until the VNA beeps indicating that it has completed the task. e Connect short end of Calibration Standard to the available end of the PORT 2 SMA cable. f Select short screen key the Reverse group. g Wait until the VNA beeps indicating that it has completed the task. h Connect load end of Calibration Standard to the available end of the PORT 2 SMA cable. i Select the loads screen key the Reverse group. j Press broadband screen key selection. k Wait until the VNA beeps indicating that it has completed the task. l Press the done loads screen key.

m You have just calibrated the other side of the reference plane. 16 Press standards done key. 17 Connect the PORT 2 SMA cable to the non-pincher side of PV fixture as shown in Figure 19.

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5 Performance Verification

Figure 19 Forward and Reverse Setup

18 Press the transmission screen key. 19 Press the do both fwd and reverse screen key. 20 Wait until the VNA beeps four times indicating that it has completed the task. 21 Press the isolation screen key. 22 Press the omit isolation screen key. 23 Press done 2 port cal screen key. 24 Set the VNA's averaging to off. 25 Save the reference plane cal by pressing the [save recall] key then the [save state] key. 26 You may change name if you wish. 27 Press the [scale reference] key. Then set the scale to 1 dB per division and the reference

position for 7 divisions.

28 Set reference value for 0 dB. 29 Press the [measure] key. 30 Press the s21 screen key. 31 Ensure s21 response on screen is flat out to 1.5 GHz.

44 N2797A User’s Guide

Performance Verification 5

Measuring Vin Response

32 Position the probe conveniently to allow the probe tip to be normal to the PV/DS board. 33 Hold the probe in position, or use a positioner, so that the signal and ground are making

contact and are perpendicular to the fixture.

34 Press the [Sweep Setup] key on the VNA. Then press the trigger menu screen key. Select the

continuous screen key. 35 You should now have the V 36 Select [display] key then data->memory screen key. 37 You have now saved Vin waveform into the VNA's memory for future use.

waveform on screen.

Measuring Vout Response

38 Disconnect the PORT 2 cable from PV/DS test board and attach to probe output on the

AutoProbe Adapter.

39 Connect the Calibration Standard load to PV/DS test board (non-pincher side). 40 Press [scale reference] key on the VNA. 41 Set reference value to –20 dB. 42 Hold probe in place as described previously. 43 The display on screen is V

out

Displaying Vout/Vin Response on the VNA

44 Press the [Display] key. 45 Then select the Data/Memory screen key. You may need to adjust the Reference Value, located

under the Scale Ref key, slightly to position the waveform at center screen. 46 Press marker key and position the marker to the first point that the signal is –3 dB below

center screen.

47 Read the marker frequency measurement and record it in Tab le 10 on page 46. 48 The bandwidth test passes if the frequency measurement is greater than or equal to the

probe's bandwidth limit, which is 1.5 GHz.

N2797A User’s Guide 45

5 Performance Verification

Performance Test Record

The recommended Test Interval: 1 year / 2000 hours.

Table 10 Performance Test Record

Probe Amplifier Test Limits Result Pass/Fail

Test 1. DC Input Resistance 1 MΩ ± 3%

Test 2. Bandwidth ≥ 1.5 GHz

46 N2797A User’s Guide

Index

Numerics

3D probe positioner, 28

accessories

available, 10

supplied, 8 attenuation ratio, 32 available accessories, 10

bandwidth, 5, 14, 32

cable, 6 calibration, probe, 27 channel identification rings, 8 cleaning, 22 compatibility, 7 compatible oscilloscopes, 7

dynamic range, 20, 32

ESD, 6

flex nose clip, 10, 11 functional test, 21

ground lead, 12

headlight, 8

impedance, channel input, 7 Infiniium oscilloscope, 7 InfiniiVision oscilloscope, 7 input capacitance, 32 input impedance over frequency, 36 input resistance, 32 inspecting, 22

Keysight Technologies, contacting, 23

N2787A 3D probe positioner, 12

offset range, 20 operating temperature

accessories, 11, 12 probe, 31

oscilloscope

compatibility, 7 Infiniium, 7

InfiniiVision, 7 oscilloscope compatibility, 7 output impedance, 32

performance test record, 46 performance verification, 37 probe

cleaning, 22

configurations, 14

handling, 24

inspecting, 22

service, 23 probe accessories, 14 probe calibration, 27 Probe Calibration d ialog box, 28 probe positioner, 12 probe, inspecting, 22

PV fixture, 28

returning for service, 23 right angle ground, 10, 11 right-angle ground, 15, 17 rigid probe tip, 10, 11 rigid tip, 15 rigit tip, 15

safety information, 24 service, 23 solderable pin, 10, 11 solderable tip, 17 specifications, 31 spring ground, 11 spring probe tip, 12 supplied accessories, 8

WEEE compliance, 33

Y-lead adapter, 10, 11 Y-lead with clips, 19 Y-leads, 16, 18

N2797A User’s Guide 47

Index

48 N2797A User’s Guide

Keysight Technologies N2797A User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Contents

1 Using the Probe

Probe Features

Using the Accessory Tips and Grounds

Dynamic Range and Offset Voltage Limitations

Functional Test

Inspecting the Probe

Cleaning the Probe

Returning the Probe for Service

Safety Information

2 Probe Calibration

Calibrating the Probe on Infiniium Oscilloscopes

Calibrating the Probe on InfiniiVision Oscilloscopes

Dimensions

4 Performance Data Plots

5 Performance Verification

Test 1. DC Input Resistance

Test 2. Bandwidth

Performance Test Record

Index