Agilent Technologies 34420A Manual de usuario

The34420A is a 71/2digit,high performancenanovolt,micro-ohm

meter. Its combination of bench-top and system features makes this

meter a versatile solution for your testing requirements now and in the

future.

Convenient bench-top features

•Built-in math operations including thermistor, thermocouple and

RTD temperature measurements

•Two channel input allows ratio and difference functions for voltage

measurements

•Highly visible vacuum-fluorescent display

•Portable, ruggedized case with non-skid feet

Flexible system features

•HP-IB (IEEE-488) interface and RS-232 interface are standard

•SCPI (Standard Commands for Programmable Instruments) and

Keithley 181 compatibility

•Readings at up to 250 per second

HP34420A

Nano Volt/Micro Ohm Meter

Agilent 34420A

GPIB

The Front-Panel at a Glance

1Input channel select 5Menu operation keys

2Measurement function keys 6Range/number of digits displayed keys

3Math operation keys 7Single trigger/autotrigger/auto hold key

4Filter select key 8Shift / local key

The Front-Panel Menu at a Glance

The menu is organized in a top-down tree structure with three levels.

A: MEASurement MENU

1: DIG FILTER

2: INTEGRATE

3: OCOMP Ω

4: LOW POWER Ω

5: LOW VOLT Ω

6: LoV LIMIT Ω

B: TEMPerature MENU

1: PROBE TYPE

2: UNITS

3: RTD TYPE

4:RTD Ro

5: T/C TYPE

6: COLD JUNCT

7: JUNCT TEMP

C: MATH MENU

1: STATS

2: NULL VALUE

3: SCALE GAIN

4: SCALE OFST

D: TRIGger MENU

1: READ HOLD

2: TRIG DELAY

3: N SAMPLES

E: SYStem MENU

1: RDGS STORE

2: SAVED RDGS

3: ERROR

4: TEST

5: CHART OUT

6: CHART SPAN

7: CHART NULL

8: DISPLAY

9: COMMA

10: PRESET

11: REVISION

F: Input/Output MENU

1: HP-IB ADDR

2: INTERFACE

3: BAUD RATE

4: PARITY

5: LANGUAGE

G: CALibration MENU

1: UNSECURED

[1: SECURED]

[2: CALIBRATE]

[3: CHART ZERO]

[4: CHART GAIN]

[5: INJECTED I]

6: CAL COUNT

7: MESSAGE

NOTE: The commands enclosed in square brackets ([ ]) in the CAL MENU are "hidden" unless the meter is UNSECURED for calibration.

To turn on menu press:

To move left/right To move up/down

To enter a command press:

Display Annunciators

*Turns on during a measurement.

Adrs Meter is addressed to listen or talk over the HP-IB interface.

Rmt Meter is in remote mode (using remote interface).

Man Meter is using manual ranging (autorange is disabled).

Trig Meter is waiting for a single trigger or external trigger.

OC Off Offset compensation is turned off.

Null A null value is being used.

Stats Math statistics operations are being used.

Scale Math scaling operations are being used.

ERROR Hardware or remote interface command error(s) detected.

Shift "Shift" key has been pressed.

Ch1 Meter input is on Channel 1.

Ch2 Meter input is on Channel 2.

Ch1 - Ch2 Meter is indicating the difference between inputs on channel 1 and channel 2.

Ch1 / Ch2 Meter is indicating the ratio of the inputs on channel 1 and channel 2.

ΩMeter is measuring resistance (Ohms).

LP Meter is using low power Ohms.

2W Meter is using 2-wire Ohms (annunciator off indicates a 4-wire measurement).

LoV Meter is using voltage limited Ohms.

Hold Automatic reading hold is enabled.

Filt The analog and/or the digital filter is enabled.

Mem Turns on when reading memory is enabled.

To review the display annunciators, hold down the Shift key as you

turn on the meter.

The Rear Panel at a Glance

1Chassis ground 5Voltmeter complete output terminal

2Power-line fuse-holder assembly 6External trigger input terminal

3Power-line voltage setting7GPIB (IEEE-488) interface connector

4Chart recorder output terminal

(Analog out)

8RS-232 interface connector

Use the front-panel Input / Output Menu to:

•Select the GPIB or RS-232 interface

•Set the GPIB bus address

•Set the RS-232 baud rate and parity

In This Book

Quick Start Chapter 1 prepares the meter for use and helps you get

familiar with a few of its front-panel features.

Front-Panel Operation Chapter 2 introduces you to the front-panel menu

and describes some of the meter’s menu features.

Features and Functions Chapter 3 gives a detailed description of the

meter’s capabilities and operation. You will find this chapter useful

whether you are operating the meter from the front panel or from a

remote interface.

Remote Interface Reference Chapter 4 contains reference

information to help you program the meter using a remote interface.

Error Messages Chapter 5 lists the error messages that may appear as

you are working with the meter. Each listing contains enough

information to help you diagnose and solve the problem.

Application Programs Chapter 6 contains several remote interface

application programs to help you develop programs for your

measurement application.

Measurement Tutorial Chapter 7 discusses measurement

considerations and techniques to help you obtain the best accuracy and

reduce sources of measurement error.

Specifications Chapter 8 lists the meter’s specifications and describes

how to interpret these specifications.

If you have questions relating to the operation of the meter, call

1-800-452-4844 in the United States, or contact your nearest

Agilent Technologies Sales Office.

Contents

Chapter 1 Quick Start

To Prepare the Meter For Use 13

If the Meter Does Not Turn On 14

To Adjust the Carrying Handle 16

To Make Input Connections 17

To Measure Voltage 19

To Measure Resistance 20

To Measure Temperature With Thermistors 21

To Measure Temperature With RTDs 21

To Measure Temperature With Thermocouples 22

To Select a Range 23

To Set the Number of Digits 24

To Set the Integration Time 25

Front-Panel Display Formats 26

To Rack Mount the Meter 27

Chapter 2 Front-Panel Operation

Front-Panel Menu Reference 31

A Front-Panel Menu Tutorial 33

To Select an Input Channel 41

To Select a Range 42

To Set or Change the Number of Digits 43

To Set the Integration Time 44

To Make Null (Relative) Measurements 45

To Store Minimum and Maximum Readings (Stats) 46

To Trigger the Meter 47

To Use Reading Hold 48

To Make Voltage Ratio and Difference Measurements 49

To Use Reading Memory 50

Chapter 3 Features and Functions

General Measurement Configuration 55

Input Filters 55

Integration Time 58

Reducing Measurement Noise 60

Number of Digits Displayed 62

Ranging 64

Overload Detection 65

Voltage Measurement Configuration 66

Input Channels 66

Resistance Measurement Configuration 68

Temperature Measurement Configuration 71

Measurement Units 71

RTD Measurements 72

Thermistor Measurements 72

Thermocouple Measurements 73

Chapter 3 Features and Functions (continued)

Math Operations 74

Null (Relative) Operation 77

Reading Hold 79

Triggering 80

Trigger Source Choices 82

The Wait-for-Trigger State 85

Halting a Measurement in Progress 85

Number of Samples 86

Number of Triggers 86

Trigger Delay 87

Automatic Trigger Delays 89

System-Related Operations 90

Reading Memory 90

Error Conditions 92

Self-Test 93

Display Control 94

Comma Separators 95

Firmware Revision Query 95

SCPI Language Version 96

Voltmeter Complete Terminal 97

External Trigger Terminal 97

Chart Output (Analog Output) 98

Chart Rollover 100

Remote Interface Configuration 101

Remote Interface Selection 101

HP-IB Address 102

Baud Rate Selection (RS-232) 103

Parity Selection (RS-232) 104

Programming Language Selection 105

Connection to a Terminal or Printer (RS-232) 106

Calibration 107

Calibration Security 107

Calibration Count 110

Calibration Message 111

Defaults, Power-On and Reset States 112

Chapter 4 Remote Interface Reference

Command Summary 117

Simplified Programming Sequence 126

Using the MEASure? Command 128

Using the CONFigure Command 128

Using the range and resolution Parameters 129

Using the READ? Command 130

Using the INITiate and FETCh? Commands 131

The MEASure? and CONFigure Commands 134

Setting the Function, Range, and Resolution 137

Selecting the Input Channel 140

Special Resistance Measurement Commands 141

Temperature Measurement Commands 142

Contents

GPIB

Tabla de contenidos

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