Keysight Technologies N2750A Manuel utilisateur

Keysight N2750/1/2A

Differential Probes

User’s Guide

Notices

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Manual Part Number

N2750–97003

Edition

February 2019

Keysight Technologies, Inc.

1900 Garden of the Gods Road

Colorado Springs, CO 80907 USA

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Safety Notices

CAUTION. 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.

WARNING. 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.

2N2750/1/2A User’s Guide

N2750/1/2A User’s Guide 3

Contents

1UsingtheProbes

Probe Features / 6

Oscilloscope Compatibility / 7

Bandwidth / 7

Available Accessories / 8

Single-Ended Measurements / 8

Quick-Action Button and

Probe Light / 9

InfiniiMode Compatible / 9

Channel-Identification Rings / 9

Exchangeable Probe Tips / 10

To Attach a Tip / 11

N2776A Browser Tip / 12

Placing the Signal Within the Probe’s Dynamic Range / 15

InfiniiMode / 16

Probe Configuration Dialog Box / 19

Quick-Action Button / 20

Probe Attenuation Ratio / 22

Functional Test / 22

Inspecting the Probe / 23

Cleaning the Probe / 23

Returning the Probe for Service / 24

Contacting Keysight Technologies / 24

Safety Information / 25

Instrument Markings and Safety Symbols / 27

4N2750/1/2A User’s Guide

Contents

2SPICEModels

N2752A probe with the N2776A Browser Tip / 30

N2750A probe with the N2777A Solder-In Tip / 33

Measured Versus Modeled Input Impedance / 36

3 Probe Calibration

Calibrating the Probe / 40

4 Characteristics and Specifications

Dimensions / 46

5PerformanceDataPlots

With N2776A Browser Tip (2:1 Attenuation) / 48

With N2776A Browser Tip (10:1 Attenuation) / 52

With N2777A Solder-In Tip (2:1 Attenuation) / 53

With N2777A Solder-In Tip (10:1 Attenuation) / 55

With N2778A Socketed Tip (2:1 Attenuation) / 57

With N2778A Socketed Tip (10:1 Attenuation) / 58

6 Performance Verification

Test 1. DC Input Resistance / 62

Procedure / 62

Test 2. Bandwidth / 63

Calibrate the Test Setup / 63

Measure Vin Response / 65

Measure Vout Response / 69

Determine the BW / 71

Performance Test Record / 73

Keysight N2750/1/2A Differential Probes

User’s Guide

1 Using the Probes

Probe Features 6

Exchangeable Probe Tips 10

Placing the Signal Within the Probe’s Dynamic Range 15

InfiniiMode 16

Quick-Action Button 20

Probe Attenuation Ratio 22

Functional Test 22

Inspecting the Probe 23

Cleaning the Probe 23

Returning the Probe for Service 24

Safety Information 25

The N2750/1/2A differential probes can be used to perform differential, common

mode, and single-ended measurements. The probes have the following

bandwidths:

N2752A: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 GHz

N2751A: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5 GHz

N2750A: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5 GHz

CAUTION These probes are ESD sensitive devices, particularly at the probe tips.

Follow standard ESD precautions when handling. Remove tip

accessories when storing the probe.

CAUTION Before using the probe, refer to “Safety Information” on page 25.

6N2750/1/2A User’s Guide

1Using the Probes

Probe Features

The N2750/1/2A differential probes feature a probe Quick Action button, light,

channel identification rings, and three different exchangeable snap-on probe tips:

browser, solder-in, and socketed. To learn more about the probe tips, refer to

“Exchangeable Probe Tips” on page 10. These probes use the AutoProbe

oscilloscope interface for automatic configuration and power.

Figure 1 Probe with Supplied Accessories and Case

Using the Probes 1

N2750/1/2A User’s Guide 7

Oscilloscope Compatibility

The probes are compatible with 9000 Series, 90000 Series, or 90000 Q/X-Series

Infiniium oscilloscopes with software version 3.50 or above. Infiniium 90000

Q/X-Series requires the N5442A adapter. The probes are compatible with

3000X-series InfiniiVision oscilloscopes (one probe maximum connected to

oscilloscope). The probes are also compatible with 4000X-series InfiniiVision

oscilloscopes (up to four probes connected to oscilloscope).

Bandwidth

As shown in the following table, the available probe bandwidth depends on the

probe model, attached probe tip, and type of signal probed. To learn about the

supplied probe tips, refer to “Exchangeable Probe Tips” on page 10.

Table 1 Available Probe Bandwidth

Signal Type

Browser Probe

Tip

Socketed Probe

Tip

Solder-In Probe

Tip

N2752A 6 GHz at 2:1 / 10:1

Differential 6 GHz

(7 GHz typical)

3 GHz 2.5 GHz

Single-Ended 6 GHz

(7 GHz typical)

1.2 GHz 2 GHz

Common-Mode N/A 1 GHz 1.4 GHz

N2751A 3.5 GHz at 2:1 / 10:1

Differential 3.5 GHz 3 GHz 2.5 GHz

Single-Ended 3.5 GHz 1.2 GHz 2 GHz

Common-Mode N/A 1 GHz 1.4 GHz

N2750A 1.5 GHz at 2:1 / 10:1

Differential 1.5 GHz 1.5 GHz 1.5 GHz

Single-Ended 1.5 GHz 1.2 GHz 1.5 GHz

Common-Mode N/A 1 GHz 1.4 GHz

8N2750/1/2A User’s Guide

1Using the Probes

Available Accessories

The following table shows the accessories that are available for use with the

probes.

Single-Ended Measurements

You can use the differential probes to make single-ended measurements by

touching one probe tip to the ground on the device being tested. In fact, using

these differential probes in any situation where a single-ended probe would

traditionally be used results in higher Common Mode Rejection Ratio (CMRR),

increased signal fidelity (due to very low impedance grounding and higher input

impedance), and decreased probe response variations (better repeatability).

Table 2 Available Accessories

Model

Number Accessory

N5442A Precision BNC adapter for use with 90000 Q/X-Series oscilloscopes

N2787A 3D probe positioner

E2655B/C or

N5443A

Performance verification and deskew fixture. The PV fixture

is used in Chapter 3, “Probe Calibration”and Chapter 6,

“Performance Verification”.

Using the Probes 1

N2750/1/2A User’s Guide 9

Quick-Action Button and

Probe Light

Press the quick-action button to turn the probe light on and off. Pressing and

holding the button will increase and decrease the light’s intensity. Using the

oscilloscope’s Probe Configuration dialog box, you can re-assign the button’s

function. Refer to “Quick-Action Button” on page 20.

Figure 2 Location of Button and Light

InfiniiMode Compatible

The probes, when fitted with the socketed or solder-in tip, are InfiniiMode

compatible. InfiniiMode allows you to switch between differential, single-ended,

and common mode measurements without needing to change or reconnect the

probe or probe leads. To learn about this feature, refer to “InfiniiMode” on

page 16.

Channel-Identification Rings

When multiple probes are connected to the oscilloscope, the channel

identification rings 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.

CAUTION 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.

10 N2750/1/2A User’s Guide

1Using the Probes

Exchangeable Probe Tips

The probe comes with three unique tips for different probing situations. They are

the browser, solder-in, and socketed tips as shown in Table 3 and described later

in this section. For information on using the solder-in and socketed tips with

InfiniiMode, refer to “InfiniiMode” on page 16.

The tip’s symmetrical design allows you to orient the tip so that either lead (for

example, the blue lead on N2777A and N2778A tips) can be associated with the

probe’s A or B sides. Refer to “InfiniiMode” on page 16 for the significance of the A

and B leads in differential measurements.

Table 3 Supplied Probe Tips

Tip Quantity Replacement Tip Kit

Differential Browser Tip (adjustable span)

described on page 12.

2 N2776A

(includes three browser tips)

InfiniiMode Solder-In Tip described on page 13. 2 N2777A

(includes three solder-in tips)

InfiniiMode Socketed Tip described on page 14. 2 N2778A

(includes three socketed tips)

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