Agilent Technologies N1021B Bedienungsanleitung

Agilent N1021B

Differential TDR Probe

User’s Guide

N1021B

User’s Guide

Agilent N1021B—At a Glance 2

Proper Handling Techniques 5

Adjusting the Probe Tip Separation 7

Attaching to a Positioner 8

Calibrating the Probe 9

Performing an Operation Verification 11

Probing a Differential Trace’s Length

Midpoint 15

Probe Characteristics 16

Returning the Probe for Service 17

Safety Symbols 18

Agilent N1021B—At a Glance

The N1021B facilitates differential time domain

reflectometry measurements in situations where RF

connectors are unavailable. It is ideal for use with the

Agilent 54754A TDR plug-in module. Although the

N1021B probe was designed for TDR applications, it

is also suitable as a high bandwidth, passive probe

for non-TDR applications.

Using the Probe

■Refer to “Proper Handling Techniques” on page 5

before using the probe for the first time.

■Refer to “Calibrating the Probe” on page 9 to cali-

brate the test setup for use with the probe.

CAUTION Electrostatic discharge (ESD) can damage or destroy

electronic components and the input circuits on plug-

in modules. Coaxial cables with both ends

unconnected may store electrostatic charges. Before

connecting any coaxial cable to a device or

instrument, momentarily short the center and outer

conductors of the cable. When making connections,

ensure the proper use of a grounded, resistor-isolated

wrist strap.

CAUTION Before connecting the phase-matched cables, always

discharge any static buildup. Momentarily short the

center and outer conductors of the cable together.

Avoid touching the front-panel input connectors

without first touching the frame of the instrument.

Supplied Accessories

Table 1 lists the items provided with the probe. The

information on the actual shipping list is more accu-

rate and should supersede the information in this

list. To order the parts listed in the table, search for

“Parts” at www.agilent.com/Find/Parts. There are no

replaceable parts on the probe.

Table 1. Items Supplied With N1021B

Item Qty Part Number

Pair of phase-matched cables

(1m)

1 N1021-60003

SMA 50ΩLoad (m) 2 1810-0118

SMA Short (m) 2 0960-0055

SMA Adapter (f-f) 2 1250-1666

Positioner Adapter 1 N1021-60008

M2.5 socket-head screws (6 mm

long)

2—

M2.5 Allen wrench 1 —

ESD Wrist Strap 1 9300-1367

ESD Wrist Strap Ground Cord 1 9300-0980

Proper Handling Techniques

Use the following techniques to avoid damaging the

probe. The probe tips are not replaceable.

■Hold the probe perpendicular to the device under

test. Probing angles greater than 15°from perpen-

dicular will likely damage the tips over time.

■Do not apply side force to the probe tips.

■Avoid fully compressing the probe-tip springs.

■Hand tighten the cable connection to the probe. Or,

use a 5 in-lb (0.56 Nm) torque wrench.

■Before cleaning the external case parts of the

N1021B, disconnect the probe from all cables. Use

a dry cloth or one slightly dampened with a mild

soap and water solution. Do not attempt to clean

internally.

CAUTION Applying excessive force when handling the probe can

result in bent or otherwise damaged probe tips. Apply

only enough pressure to ensure a secure connection.

The probe tips are spring loaded. Avoid fully

compressing the probe-tip springs. The probe tips are

not replaceable.

CAUTION Do not use too much liquid in cleaning the probe.

Water can enter the case.

Adjusting the Probe Tip Separation

Turn the probe spacing adjustment wheel to change

the spacing between the probe tips. Avoid using

excessive force at the limits of the adjustment range.

Attaching to a Positioner

The supplied adapter allows you to attach the probe

to the N1020A TDR Probe positioner, as well as many

robotic arms and common industry positioners. Two

M2.5 socket-head screws (6 mm long) and an Allen

wrench are provided to attach the adapter to the

N1021B. The two screw holes on the probe are sepa-

rated by ¼-inch (6.4 mm) on center. Torque each

screw to 5 in-lb (0.56 Nm). A ¼-inch hole in the

adapter is used to attach the adapter to the posi-

tioner.

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