Fluke 8808A 120V User manual

®

8808A

Digital Multimeter

Users Manual

July 2007, Rev. 1, 12/09

© 2007, 2009 Fluke Corporation, All rights reserved. Specifications subject to change without notice.
All product names are trademarks of their respective companies.

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LIMITED WARRANTY AND LIMITATION OF LIABILITY

Each Fluke product is warranted to be free from defects in material and workmanship under normal use and
service. The warranty period is one year and begins on the date of shipment. Parts, product repairs, and
services are warranted for 90 days. This warranty extends only to the original buyer or end-user customer of
a Fluke authorized reseller, and does not apply to fuses, disposable batteries, or to any product which, in
Fluke's opinion, has been misused, altered, neglected, contaminated, or damaged by accident or abnormal
conditions of operation or handling. Fluke warrants that software will operate substantially in accordance
with its functional specifications for 90 days and that it has been properly recorded on non-defective media.
Fluke does not warrant that software will be error free or operate without interruption.

Fluke authorized resellers shall extend this warranty on new and unused products to end-user customers
only but have no authority to extend a greater or different warranty on behalf of Fluke. Warranty support is
available only if product is purchased through a Fluke authorized sales outlet or Buyer has paid the
applicable international price. Fluke reserves the right to invoice Buyer for importation costs of
repair/replacement parts when product purchased in one country is submitted for repair in another country.

Fluke's warranty obligation is limited, at Fluke's option, to refund of the purchase price, free of charge repair,
or replacement of a defective product which is returned to a Fluke authorized service center within the
warranty period.

To obtain warranty service, contact your nearest Fluke authorized service center to obtain return
authorization information, then send the product to that service center, with a description of the difficulty,
postage and insurance prepaid (FOB Destination). Fluke assumes no risk for damage in transit. Following
warranty repair, the product will be returned to Buyer, transportation prepaid (FOB Destination). If Fluke
determines that failure was caused by neglect, misuse, contamination, alteration, accident, or abnormal
condition of operation or handling, including overvoltage failures caused by use outside the product’s
specified rating, or normal wear and tear of mechanical components, Fluke will provide an estimate of repair
costs and obtain authorization before commencing the work. Following repair, the product will be returned to
the Buyer transportation prepaid and the Buyer will be billed for the repair and return transportation charges
(FOB Shipping Point).

THIS WARRANTY IS BUYER'S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL OTHER
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY
OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. FLUKE SHALL NOT BE LIABLE
FOR ANY SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES OR LOSSES,
INCLUDING LOSS OF DATA, ARISING FROM ANY CAUSE OR THEORY.

Since some countries or states do not allow limitation of the term of an implied warranty, or exclusion or
limitation of incidental or consequential damages, the limitations and exclusions of this warranty may not
apply to every buyer. If any provision of this Warranty is held invalid or unenforceable by a court or other
decision-maker of competent jurisdiction, such holding will not affect the validity or enforceability of any other
provision.

11/99

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Table of Contents

Chapter Title Page

1 Introduction and Specifications......................................................... 1-1

Introduction............................................................................................... 1-3

Manual Set ......................................................................................................... 1-3

About this Manual ............................................................................................. 1-4

Safety Information ............................................................................................. 1-4

General Safety Summary............................................................................... 1-4

Symbols ......................................................................................................... 1-6

Options and Accessories.................................................................................... 1-7

General Specifications ....................................................................................... 1-8

Voltage .......................................................................................................... 1-8

Dimensions.................................................................................................... 1-8

Display........................................................................................................... 1-8

Environment .................................................................................................. 1-8

Safety............................................................................................................. 1-8

EMC .............................................................................................................. 1-8

Triggering...................................................................................................... 1-8

Math Functions.............................................................................................. 1-8

Electrical........................................................................................................ 1-8

Remote Interfaces.......................................................................................... 1-9

Warranty........................................................................................................ 1-9

Electrical Specifications .................................................................................... 1-9

DC Voltage Specifications ............................................................................ 1-9

AC Voltage Specifications ............................................................................ 1-10

Resistance...................................................................................................... 1-11

DC Current .................................................................................................... 1-11

AC Current .................................................................................................... 1-12

Frequency ...................................................................................................... 1-13

Continuity...................................................................................................... 1-13

Diode Test ..................................................................................................... 1-13

2 Preparing the Meter for Operation ..................................................... 2-1

Introduction........................................................................................................ 2-3

Unpacking and Inspecting the Meter ................................................................. 2-3

Contacting Fluke................................................................................................ 2-3

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8808A

Users Manual

Storing and Shipping the Meter ......................................................................... 2-3

Power Considerations ........................................................................................ 2-3

Selecting the Line Voltage ............................................................................ 2-4

Replacing the Fuses....................................................................................... 2-4

Line-Power Fuse ....................................................................................... 2-4

Current-Input Fuses................................................................................... 2-5

Connecting to Line Power ................................................................................. 2-7

Turning Power On ............................................................................................. 2-8

Adjusting the Bail .............................................................................................. 2-8

Installing the Meter into an Equipment Rack .................................................... 2-8

Cleaning the Meter............................................................................................. 2-9

Fluke 45 Emulation............................................................................................ 2-9

Illuminating All Display Segments.................................................................... 2-10

3 Operating the Meter from the Front Panel ........................................ 3-1

Introduction........................................................................................................ 3-3

Dual Display ...................................................................................................... 3-6

Primary Display............................................................................................. 3-6

Secondary Display......................................................................................... 3-6

Rear Panel .......................................................................................................... 3-8

Adjusting Meter Range...................................................................................... 3-8

Selecting a Measurement Rate........................................................................... 3-9

Selecting a Measurement Function.................................................................... 3-9

Measuring Voltage ........................................................................................ 3-10

Measuring Frequency .................................................................................... 3-10

Frequency Ranging........................................................................................ 3-11

Measuring Resistance.................................................................................... 3-11

2-Wire Resistance Measurement............................................................... 3-11

4-Wire Resistance Measurement............................................................... 3-12

Measuring Current......................................................................................... 3-13

Automatic Input Terminal Detection............................................................. 3-14

Diode / Continuity Testing ............................................................................ 3-15

Making a Triggered Measurement ................................................................ 3-16

Setting the Trigger Mode .......................................................................... 3-16

Connecting to an External Trigger............................................................ 3-16

Selecting a Function Modifier ........................................................................... 3-17

Relative Readings Modifier (REL)................................................................ 3-18

Decibels and Auto Power Modifier ............................................................... 3-18

Touch Hold Function (HOLD)...................................................................... 3-19

Minimum / Maximum Modifier (MIN MAX) .............................................. 3-20

Using the Function Modifiers in Combination.............................................. 3-21

Second Level Operations (Using the SHIFT Button).................................... 3-21

Compare Function (COMP)............................................................................... 3-22

Setting the Compare Range ........................................................................... 3-22

Using the Compare Function......................................................................... 3-22

List and Number Editors.................................................................................... 3-22

Using the List Editor ..................................................................................... 3-23

Using the Number Editor............................................................................... 3-24

Function Keys S1 – S6....................................................................................... 3-24

Power-Up Configuration.................................................................................... 3-25

Calibration ......................................................................................................... 3-25

4 Operating the Meter Using the Computer Interface ......................... 4-1

Introduction........................................................................................................ 4-3

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Local and Remote Operations ....................................................................... 4-3

Computer Interfaces ...................................................................................... 4-3

Preparing the Meter for Operations via the RS-232 Interface ........................... 4-3

Setting Communication Parameters (RS-232) .............................................. 4-3

RS-232 Print-Only Mode .............................................................................. 4-4

Cabling the Meter to a Host or Printer (RS-232)........................................... 4-5

Character Echoing and Deletion.................................................................... 4-6

Device Clear Using ^C (CNTRL C).............................................................. 4-6

RS-232 Prompts............................................................................................. 4-6

Getting Started with an Installation Test ........................................................... 4-6

Installation Test for RS-232 Operation ......................................................... 4-6

If Test Fails.................................................................................................... 4-7

How the Meter Processes Input ......................................................................... 4-7

Input Strings .................................................................................................. 4-7

Input Terminators .......................................................................................... 4-7

Sending Numeric Values to the Meter .......................................................... 4-8

Sending Command Strings to the Meter........................................................ 4-8

How the Meter Processes Output....................................................................... 4-8

Triggering Output .............................................................................................. 4-9

External Triggering from the Front Panel ..................................................... 4-9

Setting the Trigger Type Configuration ........................................................ 4-10

External Trigger via the Computer Interface................................................. 4-10

Status Registers.................................................................................................. 4-11

Event Status and Event Status Enable Registers ........................................... 4-12

Status Byte Register ...................................................................................... 4-14

Reading the Status Byte Register .................................................................. 4-15

Computer Interface Command Set..................................................................... 4-15

Common Commands ..................................................................................... 4-16

Function Commands and Queries.................................................................. 4-17

Function Modifier Commands and Queries .................................................. 4-19

Range and Measurement Rate Commands and Queries................................ 4-21

Measurement Queries.................................................................................... 4-23

Compare Commands and Queries ................................................................. 4-24

Trigger Configuration Commands................................................................. 4-24

Miscellaneous Commands and Queries......................................................... 4-25

RS-232 Remote / Local Configurations ........................................................ 4-25

RS-232 Save / Recall System Configurations ............................................... 4-26

Sample Program Using the RS-232 Computer Interface................................... 4-27

Contents (continued)

Appendices

A Applications ................................................................................................ A-1

B 2X4 Test Leads............................................................................................ B-1

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List of Tables

Table Title Page

1-1. Safety Information ................................................................................................. 1-5

1-2. Safety and Electrical Symbols................................................................................ 1-6

1-3. Accessories............................................................................................................. 1-7

2-1. Line Voltage to Fuse Rating................................................................................... 2-4

2-2. Line-Power Cord Types Available from Fluke...................................................... 2-7

3-1. Front-Panel Features .............................................................................................. 3-4

3-2. Display Annunciators and Indicators ..................................................................... 3-7

3-3. Rear-Panel Features ............................................................................................... 3-8

3-4. RS-232 Pin Out ...................................................................................................... 3-17

3-5. RS232 Pin Out........................................................................................................ 3-19

3-6. Second Level Operations ....................................................................................... 3-21

3-7. List Editor Options................................................................................................. 3-23

3-8. Number Editor Options .......................................................................................... 3-24

3-9. Factory Power-Up Configuration........................................................................... 3-25

4-1. RS-232 Communication Parameters Factory Settings ........................................... 4-4

4-2. Print Rates in RS-232 Print-Only Mode ................................................................ 4-5

4-3. Trigger Types......................................................................................................... 4-9

4-4. RS-232 Reading Transfer Rates............................................................................. 4-10

4-5. Status Register Summary ....................................................................................... 4-11

4-6. Description of Bits in ESR and ESE ...................................................................... 4-14

4-7. Description of Bits in the Status Byte Register (STB)........................................... 4-14

4-8. Common Commands.............................................................................................. 4-16

4-9. Function Commands and Queries .......................................................................... 4-17

4-10. Function Modifier Commands and Queries ........................................................... 4-19

4-11. Range and Measurement Rate Commands and Queries ........................................ 4-21

4-12. Measurement Queries............................................................................................. 4-23

4-13. Compare Commands and Queries.......................................................................... 4-24

4-14. Trigger Configuration Commands ......................................................................... 4-24

4-15. Miscellaneous Commands and Queries ................................................................. 4-25

4-16. Measurement Units Output with Format 2............................................................. 4-25

4-17. Remote/Local Configuration Commands............................................................... 4-26

4-18. Save / Call System Configuration Commands....................................................... 4-26

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List of Figures

Figure Title Page

2-1. Replacing the Line Power Fuse.............................................................................. 2-5

2-2. Replacing the Current-Input Fuses......................................................................... 2-6

2-3. Line-Power Cord Types Available from Fluke...................................................... 2-7

2-4. Bail Adjustment and Removal ............................................................................... 2-8

2-5. Boot Removal......................................................................................................... 2-9

3-1. Front Panel ............................................................................................................. 3-4

3-2. Display Annunciators and Indicators ..................................................................... 3-6

3-3. Rear Panel .............................................................................................................. 3-8

3-4. Voltage and Frequency Measurement.................................................................... 3-10

3-5. 2-Wire Resistance Measurement............................................................................ 3-11

3-6. 4-Wire Resistance Measurement............................................................................ 3-12

3-7. Input Connections for 4-Wire Ohms Using 2x4 Wire Leads................................. 3-13

3-8. Current Measurement <200 mA............................................................................. 3-14

3-9. Current Measurement 200 mA to 10 A.................................................................. 3-14

3-10. Continuity Test....................................................................................................... 3-15

3-11. Diode Test .............................................................................................................. 3-16

3-12. External Trigger Circuit ......................................................................................... 3-17

4-1. External Trigger Using Pin 9 of RS-232 Interface................................................. 4-10

4-2. Overview of Status Data Structures ....................................................................... 4-12

4-3. Event Status and Event Status Enable Registers.................................................... 4-13

4-4. Sample Program for RS-232 Computer Interface .................................................. 4-27

vii

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Chapter 1

Introduction and Specifications

Title Page

Introduction.......................................................................................................... 1-3

Manual Set ........................................................................................................... 1-3

About this Manual ............................................................................................... 1-4

Safety Information ............................................................................................... 1-4

General Safety Summary................................................................................. 1-4

Symbols ........................................................................................................... 1-6

Options and Accessories...................................................................................... 1-7

General Specifications ......................................................................................... 1-8

Voltage ............................................................................................................ 1-8

Dimensions...................................................................................................... 1-8

Display............................................................................................................. 1-8

Environment .................................................................................................... 1-8

Safety............................................................................................................... 1-8

EMC ................................................................................................................ 1-8

Triggering........................................................................................................ 1-8

Math Functions................................................................................................ 1-8

Electrical.......................................................................................................... 1-8

Remote Interfaces............................................................................................ 1-9

Warranty.......................................................................................................... 1-9

Electrical Specifications ...................................................................................... 1-9

DC Voltage Specifications .............................................................................. 1-9

AC Voltage Specifications .............................................................................. 1-10

Resistance........................................................................................................ 1-11

DC Current ...................................................................................................... 1-11

AC Current ...................................................................................................... 1-12

Frequency ........................................................................................................ 1-13

Continuity........................................................................................................ 1-13

Diode Test ....................................................................................................... 1-13

1-1

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Introduction and Specifications

Introduction 1

Introduction

The Fluke 8808A Digital Multimeter (hereafter referred to as the Meter) is a 5-1/2 digit
dual-display multimeter designed for bench-top, field service, and system applications.
The multiple measurement functions, plus the RS-232 remote interface, make the Meter
an ideal candidate for precision manual measurements and use in automated systems. For
portability, the Meter includes a carrying handle that also serves as a bail for bench-top
operation.

Some features provided by the Meter are:

• A dual vacuum fluorescent display that allows two properties of an input signal to be

displayed at the same time (e.g., ac voltage in one display and frequency in the other)

• 5-1/2 digit resolution

• True-rms ac

• 2, 4 wire resistance or patented 2x4 wire resistance measurement technique

• 200 mV to 1000 Vdc range with 1 μV sensitivity

• 200 mV to 750 Vac rms with 1 μV sensitivity

• 200 Ω to 100 MΩ with 1 mΩ sensitivity

• 200 μA to 10 Adc with 1 nA sensitivity

• 20 mA to 10 Aac with 100 nA sensitivity

• Frequency measurements from 20 Hz to 1 MHz

• Continuity and diode test

• Measurement rates of 2.5, 20 and 100 samples/second (slow, medium and fast,

respectively)

• Front-panel setup key for single key access to saved setups

• A compare mode to determine if a measurement is within defined limits

• Remote operation via the RS-232 interface

• Closed-case calibration (no internal calibration adjustments)

Manual Set

The manual set for this Meter consists of a printed Getting Started Manual and a Users
Manual on a CD-ROM. The Getting Started Manual contains basic getting started

information, contacting Fluke, unpacking, and general specifications.

1-3

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8808A

Users Manual

About this Manual

This manual contains all the information a new user will need to operate the Meter
effectively. This manual is divided into the following chapters:

Chapter 1, “Introduction and Specifications,” provides information on how safely to
use the Meter, and standard and optional accessories and specifications.

Chapter 2, “Preparing the Meter for Operation,” provides information on setting the
Meter’s line voltage, connecting it to a power source, and turning the Meter on.

Chapter 3, “Operating the Meter from the Front Panel,” provides detailed information
on using the Meter from the front panel.

Chapter 4, “Applications,” provides detailed information on using the Meter to make
electrical measurements.

Chapter 5, “Operating the Meter using the Computer Interface,” describes how to set
up, configure, and operate the Meter via the RS-232 computer interface on the
Meter’s rear panel.

Appendices

Safety Information

This section addresses safety considerations and describes symbols that may appear on
the Meter or in the manual.

A Warning statement identifies conditions or practices that could result in injury or
death. A Caution statement identifies conditions or practices that could result in damage
to the Meter or equipment to which it is connected.

To avoid electric shock, personal injury, or death, carefully read
the information in Table 1-1, “Safety Information,” before
attempting to install, use or service the Meter.

General Safety Summary

This instrument has been designed and tested in accordance with the European standard
publication EN61010-1: 2001 and U.S. / Canadian standard publications UL 61010­1:2004and CAN/CSA-C22.2 No.61010.1:2004. The Meter has been supplied in a safe
condition.

This manual contains information and warnings that must be observed to keep the
instrument in a safe condition and ensure safe operation.

To use the Meter correctly and safely, read and follow the precautions in Table 1-1 and
follow all the safety instructions or warnings given throughout this manual that relate to
specific measurement functions. In addition, follow all generally accepted safety
practices and procedures required when working with and around electricity.

XWWarning

1-4

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Introduction and Specifications

Table 1-1. Safety Information

Safety Information 1

XW Warning

To avoid possible electric shock, personal injury, or death, read the following before
using the Meter:

• Use the Meter only as specified in this manual, or the protection provided by the Meter

might be impaired.

• Do not use the Meter in wet environments.

• Inspect the Meter before using it. Do not use the Meter if it appears damaged.

• Inspect the test leads before use. Do not use them if insulation is damaged or metal is

exposed. Check the test leads for continuity. Replace damaged test leads before using
the Meter.

• Verify the Meter's operation by measuring a known voltage before and after using it. Do

not use the Meter if it operates abnormally. Protection may be impaired. If in doubt,
have the Meter serviced.

• Whenever it is likely that safety protection has been impaired, make the Meter

inoperative and secure it against any unintended operation.

• Have the Meter serviced only by qualified service personnel.

• Do not apply more than the rated voltage, as marked on the Meter, between the

terminals or between any terminal and earth ground.

• Always use the power cord and connector appropriate for the voltage and outlet of the

country or location in which you are working.

• Remove test leads from the Meter before opening the case.

• Never remove the cover or open the case of the Meter without first removing it from the

main power source.

• Never operate the Meter with the cover removed or the case open.

• Use caution when working with voltages above 30 V ac rms, 42V ac peak, or 42 V dc.

These voltages pose a shock hazard.

• Use only the replacement fuses specified by the manual.

• Use the proper terminals, function and range for your measurements.

• Do not operate the Meter around explosive gas, vapor or dust.

• When using probes, keep your fingers behind the finger guards.

• When making electrical connections, connect the common test lead before connecting

the live test lead. When disconnecting, disconnect the live test lead before
disconnecting the common test lead.

• Disconnect circuit power and discharge all high voltage capacitors before testing

resistance, continuity, diodes, or capacitance.

• Before measuring current, check the Meter's fuses and turn OFF power to the circuit

before connecting the Meter to the circuit.

• When servicing the Meter, use only specified replacement parts.

1-5

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8808A

Users Manual

Symbols

Table 1-2 lists safety and electrical symbols that appear on the Meter or in this manual.

Table 1-2. Safety and Electrical Symbols

Symbol Description Symbol Description

W

X

Risk of danger. Important
information. See manual.

Hazardous voltage. Voltage > 30 V
dc or ac peak might be present.

P Display ON / OFF and Meter reset.

J Earth ground

B AC (Alternating Current) E Capacitance
F DC (Direct Current) G Diode
D

or

AC or DC (Alternating or Direct
Current)

I Fuse

C

R

Continuity test or continuity beeper
tone

Y

Digital signal

Y Potentially hazardous voltage U Maintenance or Service

T Double insulated < Recycle

Do not dispose of this product as

h

CAT II

Static awareness. Static discharge
can damage parts.

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

~

CAT I

unsorted municipal waste. Contact
Fluke or a qualified recycler for
disposal.

Measurement Category I is for
measurements not directly
connected to mains.

1-6

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Introduction and Specifications

Options and Accessories 1

Options and Accessories

Table 1-3 lists available options and accessories.

Table 1-3. Accessories

Item Model / Part Number

Premium Test Lead Set TL71

Fuse, .25*1.25, 0.063 A, 250 V, Slow 163030

Fuse, .25*1.25, 0.125 A, 250 V, Slow 166488

F1 - Fuse, 11 A, 1000 V, Fast, 406INX1.5IN, BULK 803293

F2 - Fuse, 440 mA, 1000 V, Fast, 406INX1.375IN, BULK 943121

Rack Mount Kit 8845A & 8846A Single Y8846S

Rack Mount Kit 8845A & 8846A Dual Y8846D

RS-232 Cable (2 m) RS43

Precision Electronic Probe Set TL910

2X4 Wire Ohms 1000 V Test Lead TL2X4W-PTII

FlukeView Forms Basic Software FVF-SC5

FlukeView Forms Software Upgrade to enhanced version FVF-UG

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8808A

Users Manual

General Specifications

Voltage

100V Setting ...................................................... 90 V to 110 V

120V Setting ..................................................... 108 V to 132 V

220V Setting ..................................................... 198 V to 242 V

240V Setting ..................................................... 216 V to 264 V

Frequency.......................................................... 47 Hz to 440 Hz

Power Consumption ......................................... 15 VA peak (10 W average)

Dimensions

Height................................................................. 88 mm (3.46 in)

Width.................................................................. 217 mm (8.56 in)

Depth ................................................................. 297 mm (11.7 in)

Weight ................................................................ 2.1 kg (4.6 Ib)

Display

Vacuum Fluorescent Display, segment

Environment

Temperature

Operating ........................................................ 0 °C to 50 °C

Storage ...........................................................-40 °C to 70 °C

Warm Up......................................................... ½ hour to full uncertainty specifications

Relative Humidity (non-condensing)

Operating ........................................................ <90 % (0 °C to 28 °C)

<75 % (28 °C to 40 °C)
<45 % (40 °C to 50 °C)

Storage .......................................................... -40 °C to 70 °C <95 %

Altitude

Operating ....................................................... 2,000 Meters

Storage............................................................... 12,000 Meters

Vibration ............................................................Complies with MIL-PRF-28800F Class 3

Safety

Complies with IEC 61010-1:2001, ANSI/ISA 61010-1 (S82.02.01):2004, UL 61010-1:2004, CAN/CSA C22.2 No.

61010.1:2004, CAT I 1000V/CAT II 600 V

EMC

Designed to comply with IEC 61326-1:1997+A1:1998+A2:2000

Triggering

Trigger Delay .................................................... 400 ms

External Trigger Delay ..................................... <2 ms

External Trigger Jitter ..................................... <1 ms

Trigger Input ..................................................... TTL Levels

Trigger Output ................................................... 5 V max

Math Functions

Min/max, relative, hold, compare and dB functions

Electrical

Input Protection ............................................... 1000 V all ranges

1-8

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Introduction and Specifications

Electrical Specifications 1

Overrange.......................................................... 10 % on the largest ranges of all functions except continuity and diode

test

Remote Interfaces

RS-232C

Warranty

One year

Electrical Specifications

Specifications are valid for 5-½ digit mode and after at least a half-hour warm-up.

DC Voltage Specifications

Maximum Input ................................................. 1000 V on any range

Common Mode Rejection................................. 120 dB at 50 or 60 Hz ±0.1％ (1 kΩ unbalance)

Normal Mode Rejection .................................... 80 dB at Slow Rate

A/D Nonlinearity................................................ 15 ppm of range

Input Bias Current ............................................ <30 pA at 25 °C

Settling Considerations ................................... Measurement settling times are affected by source impedance, cable

Range

200 mV 199.999 mV

2 V 1.99999 V

20 V 19.9999 V

200 V 199.999 V 1 mV 10 mV 10 mV

1000 V 1000.00 V 10 mV 100 mV 100 mV

Notes:
[1] At some dual display measurements, the input impedance of 200 mV and 2 V ranges may be changed to 10 MΩ.

Full-Scale

(5-1/2 Digits)

Slow Medium Fast

1 μV 10 μV 10 μV

10 μV 100 μV 100 μV

100 μV 1000 μV 1000 μV

dielectric characteristics, and input signal changes

Input Characteristics

Resolution

Input Impedance

[1]

>10 GΩ

[1]

>10 GΩ
10 MΩ±1 %
10 MΩ±1 %
10 MΩ±1 %

Accuracy

Uncertainty

Range

200 mV 0.01 + 0.003 0.015 + 0.004 0.0015 + 0.0005

2 V 0.01 + 0.002 0.015 + 0.003

20 V 0.01 + 0.003 0.015 + 0.004

200 V 0.01 + 0.002 0.015 + 0.003

1000 V 0.01 + 0.002 0.015 + 0.003

Notes:
[1] Uncertainty given as ± (% of reading + % of range)

90 days 1 year

23 °C ± 5 °C 23 °C ± 5°C

[1]

Temperature Coefficient/°C

Outside 18 – 28 °C

0.001 + 0.0005

0.0020 + 0.0005

0.0015 + 0.0005

0.0015 + 0.0005

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8808A

Users Manual

AC Voltage Specifications

AC Voltage specifications are for ac sinewave signals >5 % of range. For inputs from 1 % to 5 % of range and <50 kHz,
add an additional error of 0.1 % of range, and for 50 kHz to 100 kHz, add 0.13 % of range.

Maximum Input ................................................. 750 V rms or 1000 V peak or 8 x 10

Measurement Method ....................................... AC-coupled true-rms. Measures the ac component of input with up to

1000 V dc bias on any range.

AC Filter Bandwidth ......................................... 20 Hz – 100 kHz

Common Mode Rejection................................. 60 dB at 50 Hz or 60 Hz (1 kΩ unbalance)

Maximum Crest Factor .................................... 3:1 at Full Scale

Additional Crest Factor Errors (<100 Hz) ...... Crest Factor 1-2, 0.05 % of full scale

Crest Factor 2-3, 0.2 % of full scale
Only applies for non-sinusoid signals

Input Characteristics

7

Volts-Hertz product

Range

200 mV 199.999 mV

2 V 1.99999 V

20 V 19.9999 V

200 V 199.999 V 1 mV 10 mV 10 mV

750 V 750.00 V 10 mV 100 mV 100 mV

Full-Scale

(5-1/2 Digits)

Slow Medium Fast

1 μV 10 μV 10 μV

10 μV 100 μV 100 μV

100 μV 1000 μV 1000 μV

Resolution

Input Impedance

1 MΩ ±2 % shunted by

<100 pf

Accuracy

Uncertainty

Range Frequency

200 mV 20 Hz – 45Hz 0.8 + 0.05 0.9 + 0.05 0.01 + 0.005

45 Hz – 20 kHz 0.15 + 0.05 0.2 + 0.05 0.01 + 0.005

20 kHz – 50 kHz 0.3 + 0.05 0.35 + 0.05 0.01 + 0.005

50 kHz – 100 kHz 0.8 + 0.05 0.9 + 0.05 0.05 + 0.01

2 V 20 Hz – 45Hz 0.8 + 0.05 0.9 + 0.05 0.01 + 0.005

45 Hz – 20 kHz 0.15 + 0.05 0.2 + 0.05 0.01 + 0.005

20 kHz – 50 kHz 0.3 + 0.05 0.35 + 0.05 0.01 + 0.005

50 kHz – 100 kHz 0.8 + 0.05 0.9 + 0.05 0.05 + 0.01

20 V 20 Hz – 45 Hz 0.8 + 0.05 0.9 + 0.05 0.01 + 0.005

45 Hz – 20 kHz 0.15 + 0.05 0.2 + 0.05 0.01 + 0.005

20 kHz – 50 kHz 0.3 + 0.05 0.35 + 0.05 0.01 + 0.005

50 kHz – 100 kHz 0.8 + 0.05 0.9 + 0.05 0.05 + 0.01

200 V 20 Hz – 45Hz 0.8 + 0.05 0.9 + 0.05 0.01 + 0.005

45 Hz – 20 kHz 0.15 + 0.05 0.2 + 0.05 0.01 + 0.005

20 kHz – 50 kHz 0.3 + 0.05 0.35 + 0.05 0.01 + 0.005

50 kHz – 100 kHz 0.8 + 0.05 0.9 + 0.05 0.05 + 0.01

750 V 20 Hz – 45Hz 0.8 + 0.05 0.9 + 0.05 0.01 + 0.005

45 Hz – 20 kHz 0.15 + 0.05 0.2 + 0.05 0.01 + 0.005

20 kHz – 50 kHz 0.3 + 0.05 0.35 + 0.05 0.01 + 0.005

50 kHz – 100 kHz 0.8 + 0.05 0.9 + 0.05 0.05 + 0.01

Notes:
[1] Uncertainty given as ± (% of reading + % of range)

90 days 1 year

23 °C ± 5 °C 23 °C ± 5 °C

[1]

Temperature

Coefficient/°C

Outside 18 – 28 °C

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Introduction and Specifications

Electrical Specifications 1

Resistance

Specifications are for 4-wire resistance function, or 2-wire resistance with REL. If REL is not used, add 0.2 Ω for 2-wire
resistance plus lead resistance.

Measurement Method ....................................... Current source referenced to LO input

Max Lead Resistance (4-wire ohms) ............... 10 % of range per lead for 200 Ω, 2 kΩ ranges. 1 kΩ per lead on all

Input Protection ................................................ 1000 V on all ranges

other ranges.

Input Characteristics

Range

200 Ω 199.999 Ω 0.001 Ω 0.01 Ω 0.01 Ω
2 kΩ 1.99999 kΩ 0.01 Ω 0.1 Ω 0.1 Ω
20 kΩ 19.9999 kΩ 0.1 Ω 1 Ω 1 Ω
200 kΩ 199.999 kΩ 1 Ω 10 Ω 10 Ω
2 MΩ 1.99999 MΩ 10 Ω 100 Ω 100 Ω
20 MΩ 19.9999 MΩ 100 Ω 1 kΩ 1 kΩ
100 MΩ 100.000 MΩ 1 kΩ 10 kΩ 10 kΩ

Full-Scale

(5-1/2 Digits)

Slow Medium Fast

Resolution

Accuracy

Uncertainty

Range

200 Ω
2 kΩ
20 kΩ
200 kΩ
2 MΩ
20 MΩ
100 MΩ

Notes:
[1] Uncertainty given as ± (% of reading + % of range)

90 days 1 year

23 °C ± 5 °C 23 °C ± 5 °C

0.02 + 0.004 0.03 + 0.004

0.015 + 0.002 0.02 + 0.003

0.015 + 0.002 0.02 + 0.003

0.015 + 0.002 0.02 + 0.003

0.03 + 0.003 0.04 + 0.004

0.2 + 0.003 0.25 + 0.003

1.5 + 0.004 1.75 + 0.004

[1]

Temperature Coefficient/°C

Current Source

0.8 mA

0.8 mA

0.08 mA

0.008 mA

0.9 μA

0.16 μA

0.16 μA || 10 MΩ

Outside 18 – 28 °C

0.003 + 0.0006

0.003 + 0.0005

0.003 + 0.0005

0.003 + 0.0005

0.004 + 0.0005

0.01 + 0.0005

0.2 + 0.0005

DC Current

Input Protection ............................................... Tool accessible 11 A / 1000 V and 440 mA / 1000 V fuses.

Shunt Resistance.............................................. 0.01 Ω for 2 A and 10 A ranges

Range

200 μA 199.999 μA 0.001 μA 0.01 μA 0.01 μA

2 mA

20 mA 19.9999 mA

200 mA 199.999 mA

2 A 1.99999 A

10 A 10.0000 A

Full-Scale

(5-1/2 Digits)

1999.99 μA 0.01 μA 0.1 μA 0.1 μA

Slow Medium Fast

0.1 μA 1 μA 1 μA
1 μA 10 μA 10 μA

10 μA 100 μA 100 μA

100 μA

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1 Ω for 20 mA and 200 mA
Burden voltage < 5 mV for 200 μA and 2 mA range.

Input Characteristics

Resolution

1 mA 1 mA

Burden Voltage

<5 mV

<5 mV

<0.05 V

<0.5 V

<0.1 V

<0.5 V

8808A

Users Manual

Accuracy

Uncertainty

Range

200 μA

2 mA 0.015 + 0.005 0.02 + 0.005 0.002 + 0.001

20 mA 0.03 + 0.02 0.04 + 0.02 0.005 + 0.001

200 mA 0.02 + 0.005 0.03 + 0.008 0.005 + 0.001

2 A 0.05 + 0.02 0.08 + 0.02 0.008 + 0.001

10 A 0.18 + 0.01 0.2 + 0.01 0.008 + 0.001

Notes:
[1] Uncertainty given as ± (% of reading + % of range)

90 days 1 year

23 °C ± 5 °C 23 °C ± 5 °C

0.02 + 0.005 0.03 + 0.005 0.003 + 0.001

[1]

Temperature Coefficient/°C

Outside 18 – 28 °C

AC Current

The following ac current specifications are for sinusoidal signals with amplitudes greater than 5 % of range. For inputs
from 1 % to 5 % of range, add an additional error of 0.1 % of range.

Input Protection ................................................ Tool accessible 11 A / 1000 V and 440 mA / 1000 V fuses

Measurement Method ....................................... AC-coupled True RMS

Shunt Resistance.............................................. 0.01 Ω for 2 A and 10 A ranges

AC Filter Bandwidth ......................................... 20 Hz – 100 kHz

Maximum Crest Factor ..................................... 3:1 at Full Scale

Additional Crest Factor Errors (<100 Hz) ...... Crest Factor 1-2, 0.05 % of full scale

1 Ω for 20 mA and 200 mA

Crest Factor 2-3, 0.2 % of full scale
Only applies to non-sinusoid signals

Input Characteristics

Range

20 mA 19.9999 mA

200 mA 199.999 mA

2 A 1.99999 A

10 A 10.0000 A

Full-Scale

(5-1/2 Digits)

Resolution

Slow Medium Fast

0.1 μA 1 μA 1 μA
1 μA 10 μA 10 μA

10 μA 100 μA 100 μA

100 μA

1 mA 1 mA

Burden Voltage

<0.05 V

<0.5 V

<0.1 V

<0.5 V

Accuracy

Uncertainty

Range Frequency

20 mA 20 Hz - 45Hz 1 + 0.05 1.25 + 0.06 0.015 + 0.005

45 Hz - 2 kHz 0.25 + 0.05 0.3 + 0.06 0.015 + 0.005

200 mA 20 Hz - 45Hz 0.8 + 0.05 1 + 0. 06 0.015 + 0.005

45 Hz - 2 kHz 0.25 + 0.05 0.3 + 0.06 0.015 + 0.005

2 A 20 Hz - 45Hz 1 + 0.05 1.25 + 0.06 0.015 + 0.005

45 Hz - 2 kHz 0.25 + 0.05 0.3 + 0.06 0.015 + 0.005

10 A 20 Hz - 45Hz 1 + 0.1 1.25 + 0.12 0.015 + 0.005

45 Hz - 2 kHz 0.35 + 0.1 0.5 + 0.12 0.015 + 0.005

Notes:
[1] Uncertainty given as ± (% of reading + % of range)

90 days 1 year

23 °C ± 5 °C 23 °C ± 5 °C

[1]

Temperature

Coefficient/°C

Outside 18 – 28 °C

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Introduction and Specifications

Electrical Specifications 1

Frequency

Gate Time .......................................................... 131 ms

Measurement Method ....................................... AC-coupled input using the ac voltage measurement function.

Settling Considerations ................................... When measuring frequency after a dc offset voltage change, errors

Measurement Considerations ......................... To minimize measurement errors, shield inputs from external noise

may occur. For the most accurate measurement, wait up to 1 second
to allow input blocking RC time constant to settle.

when measuring low voltage, low frequency signals.

Accuracy

Range Frequency

20 Hz – 2 kHz 0.01 + 0.002 0.01 + 0.003 0.002 + 0.001

100 mV to

[1,2]

750 V

Notes:

[1] Input > 100 mV

[2] Limited to 8* 10

2 kHz – 20 kHz 0.01 + 0.002 0.01 + 0.003 0.002 + 0.001

20 kHz – 200 kHz 0.01 + 0.002 0.01 + 0.003 0.002 + 0.001

200 kHz – 1 MHz 0.01 + 0.004 0.01 + 0.006 0.002 + 0.002

7

V Hz

Uncertainty

90 days 1 year

23 °C ± 5 °C 23 °C ± 5 °C

Temperature

Coefficient/°C

Outside 18 – 28 °C

Continuity

Continuity Threshold........................................ 20 Ω

Test Currents .................................................... 1 mA

Response Time ................................................ 100 samples/sec with audible tone

Rate .................................................................... Fast

Maximum Reading ............................................ 199.99 Ω

Resolution ......................................................... 0.01 Ω

Diode Test

Response Time ................................................. 100 samples/sec with audible tone

Rate .................................................................... Fast

Maximum Reading ............................................ 1.9999 V

Resolution ......................................................... 0.1 mV

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Chapter 2

Preparing the Meter for Operation

Title Page

Introduction........................................................................................................ 2-3

Unpacking and Inspecting the Meter ................................................................. 2-3

Contacting Fluke................................................................................................ 2-3

Storing and Shipping the Meter ......................................................................... 2-3

Power Considerations ........................................................................................ 2-3

Selecting the Line Voltage ............................................................................ 2-4

Replacing the Fuses....................................................................................... 2-4

Line-Power Fuse ....................................................................................... 2-4

Current-Input Fuses................................................................................... 2-5

Connecting to Line Power ................................................................................. 2-7

Turning Power On ............................................................................................. 2-8

Adjusting the Bail .............................................................................................. 2-8

Installing the Meter into an Equipment Rack .................................................... 2-8

Cleaning the Meter............................................................................................. 2-9

Fluke 45 Emulation............................................................................................ 2-9

Illuminating All Display Segments.................................................................... 2-10

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Preparing the Meter for Operation

Introduction 2

Introduction

This chapter explains how to prepare the Meter for operation by selecting the proper line
voltage, connecting the proper power cord for the selected line voltage, and turning the
Meter on. Also included is information on the proper storage, shipping, and cleaning of
the Meter.

Unpacking and Inspecting the Meter

Every care is taken in the choice of packing material to ensure that your Meter will reach
you in perfect condition. If the Meter has been subject to excessive handling in transit,
there may be visible external damage to the shipping carton. In the event of damage, keep
the shipping container and packing material for the carrier’s inspection.

Carefully unpack the Meter from its shipping container and inspect the contents for
damaged or missing items. If the Meter appears damaged or something is missing,
contact the carrier and Fluke immediately. Save the container and packing material in
case you have to return the Meter.

Storing and Shipping the Meter

To prepare the Meter for storage or shipping, place it inside a sealed bag, fit the bag into
the packing material inside the original shipping container, and then secure the package.
Use the original shipping container if possible, as it provides shock isolation for normal
handling operations. If the original shipping container is not available, use a box that is

17.5 x 15.5 x 8.0 inches, with cushioning material that fills the space between the Meter
and the sides of the box.

To store the Meter, place the box under cover in a location that complies with the storage
environment specifications described in the “General Specifications” section in Chapter 1.

Power Considerations

The Meter operates on varying power distribution standards found throughout the world
and must be set up to operate on the line voltage that will power it. The Meter is packed
ready for use with a line voltage determined at the time of ordering. If the selected line
voltage does not match the power that the Meter will be plugged into, the Meter’s line­voltage setting must be changed and replacement of the line fuse may be required.

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8808A

Users Manual

Selecting the Line Voltage

The Meter operates on four different input line voltages. The selected line-voltage setting
is visible through the window in the line-fuse holder on the Meter’s rear panel.

1. Unplug the power cord.

2. Insert a small screwdriver blade into the narrow recess to the left of the fuse

holder and pry it to the right until the holder pops out. See Figure 2-1.

3. Remove the voltage-selector block from the fuse holder.

4. Rotate the selector block until the desired voltage rating faces outward.

5. Replace the selector block back into the fuse holder.

6. Install the fuse holder back into the Meter and reconnect the power cord.

Changing the line-voltage setting may require a different line-power fuse for proper
operation.

Replacing the Fuses

The Meter uses one fuse to protect the line-power input and two fuses to protect the
current-measurement inputs.

Line-Power Fuse

The Meter has a line-power fuse in series with the power supply. Table 2-1 indicates the
proper fuse for each of the four line-voltage selections. The line-power fuse is accessed
through the rear panel.

1. Unplug the power cord.

2. Insert a small screwdriver blade into the narrow recess to the left of the fuse

holder and pry it to the right until the holder pops out. See Figure 2-1.

3. Remove the fuse and replace it with a fuse of an appropriate rating for the

selected line-power voltage. See Table 2-1.

4. Replace the selector block back into the fuse holder.

To avoid electric shock or fire, do not use makeshift fuses or
short-circuit the fuse holder.

Line Voltage Selection Fuse Rating

XW Warning

Table 2-1. Line Voltage to Fuse Rating

100 / 120 0.125 A, 250 V (slow blow)

220 / 240 0.063 A, 250 V (slow blow)

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Preparing the Meter for Operation

120

Figure 2-1. Replacing the Line Power Fuse

Power Considerations 2

eue20.eps

Current-Input Fuses

The 200 mA and 10 A inputs are protected by user-replaceable fuses.

• The 200 mA input is protected by a fuse (F2) rated at 440 mA, 1000 V (fast

blow), 10,000 A minimum breaking capacity.

• The 10 A input is protected by a fuse (F1) rated at 11 A, 1000 V (fast blow),

10,000 A minimum breaking capacity.

For protection against fire or arc flash, replace a blown fuse
with a fuse of an identical rating.

To test the current-input fuses:

1. Turn on the Meter and plug a test lead into the INPUT VZYR HI terminal.

2. Press O.

3. Press V to set the range to 200 Ω. Only the 200 Ω, 2 kΩ, and 20 kΩ ranges

can be used to test the mA input fuse.

4. Insert the other end of the test lead into the mA terminal. If the fuse is good, the

Meter displays a reading of <10 Ω. If the fuse is blown, the Meter displays 0L to
indicate an overload.

5. Remove the test lead from the mA terminal and insert it into the 10 A terminal.

If the fuse is good, the Meter displays a reading of <2 Ω. If the fuse is blown, the
Meter displays 0L to indicate an overload.

XW Warning

XW Warning

To avoid electric shock, remove the power cord and any test
leads from the Meter before opening the current-input fuse
cover.

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8808A

Users Manual

To replace the current-input fuses:

1. Remove power from the Meter by unplugging its power cord.

2. Turn the Meter upside down.

3. Remove the retaining screw on the fuse access door located on the bottom of the

Meter. See Figure 2-2.

4. Remove the protective cover from the fuse holders by slightly depressing the

back edge of the cover to unlatch it from the printed circuit board. Pull up on the
back edge of the cover and remove it from the fuse compartment.

5. Remove the defective fuse and replace it with a fuse of an appropriate rating. See

Table 2-1.

6. Replace the protective cover by pushing it over the fuses while aligning the

catches with the holes in the printed circuit board. Press the cover down until the
catches engage the printed circuit board.

7. Replace the fuse access door and install the retaining screw.

Fuses

Figure 2-2. Replacing the Current-Input Fuses

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F1

F2

Bottom front

left corner

eue04.eps

Preparing the Meter for Operation

Connecting to Line Power 2

Connecting to Line Power

XW Warning

To avoid shock hazard, connect the factory supplied three­conductor line power cord to a properly grounded power outlet.
Do not use a two-conductor adapter or extension cord, as this
will break the protective ground connection. If a two-conductor
power cord must be used, a protective grounding wire must be
connected between the ground terminal and earth ground
before connecting the power cord or operating the Meter.

1. Verify that the line voltage is set to the correct setting.

2. Verify that the correct fuse for the line voltage is installed.

3. Connect the power cord to a properly grounded three-prong outlet. See Figure 2-

3 for line-power cord types available from Fluke. Refer to Table 2-2 for
descriptions of the line-power cords.

LC-1 LC-2 LC-3 LC-4

LC-5 LC-6 LC-7

Figure 2-3. Line-Power Cord Types Available from Fluke

Table 2-2. Line-Power Cord Types Available from Fluke

Type Voltage / Current Fluke Model Number

North America 120 V / 15 A LC-1

North America 240 V / 15 A LC-2

Universal Euro 220 V / 16 A LC-3

United Kingdom 240 V / 13 A LC-4

Switzerland 220 V / 10 A LC-5

alh03.eps

Australia 240 V / 10 A LC-6

South Africa 240 V / 5 A LC-7

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8808A

Users Manual

Turning Power On

1. If required, connect the Meter to line power.

2. Toggle the power switch on the rear panel so the “I” side of the switch is

depressed. The Meter will turn on and briefly illuminate all LCD segments.

Note

To save on power consumption, the Meter can be set to a standby mode by
pressing P on the front panel. Press it again to bring the Meter up to full
power.

Adjusting the Bail

The Meter’s bail (handle) is adjustable to provide two viewing angles. The bail is also
adjustable for carrying or storing the Meter.

To adjust the bail, pull the ends out to a hard stop (about 1/4-inch on each side) and then
rotate it to one of the four stop positions as shown in Figure 2-4.

To remove the bail, adjust it to the vertical stop position and pull the ends all the way out.

1 Store

3 Carry

2 Tilt up

4 Remove

Figure 2-4. Bail Adjustment and Removal

eue21.eps

Installing the Meter into an Equipment Rack

The Meter is mountable in a standard 19-inch rack using a rack mount kit. See the
“Options and Accessories” section in Chapter 1 for ordering information.

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Preparing the Meter for Operation

To prepare the Meter for rack mounting, remove the bail and remove the front and rear
protective boots. To remove a boot, stretch a corner then slide it off as shown in Figure 2-

5.

To install the Meter into the rack, refer to the instructions provided with the Rack Mount
Kit.

Cleaning the Meter 2

Cleaning the Meter

To avoid electric shock or damage to the Meter, never get water
inside the Meter.

To avoid damaging the Meter’s housing, do not apply solvents
to the Meter.

If the Meter requires cleaning, wipe it down with a cloth that is lightly dampened with
water or a mild detergent. Do not use aromatic hydrocarbons, alcohol, chlorinated
solvents, or methanol-based fluids when wiping down the Meter.

Fluke 45 Emulation

To switch the Meter to Fluke 45 emulation:
Press and hold S and f for two seconds.

Figure 2-5. Boot Removal

XW Warning

W Caution

eue22.eps

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8808A

Users Manual

Press U or V to scroll between F8808A and F45. The presently selected mode will
appear bright in the display, while the other is dim.

Press R to set the mode and reset the Meter.

Illuminating All Display Segments

To illuminate all display segments, start with the Meter display off. Next, press and hold
S then press P to turn on the Meter. Release the buttons when the display
illuminates. To return to normal measurement mode, press S.

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Chapter 3

Operating the Meter from the Front Panel

Title Page

Introduction........................................................................................................ 3-3

Dual Display ...................................................................................................... 3-6

Primary Display............................................................................................. 3-6

Secondary Display......................................................................................... 3-6

Rear Panel .......................................................................................................... 3-8

Adjusting Meter Range...................................................................................... 3-8

Selecting a Measurement Rate........................................................................... 3-9

Selecting a Measurement Function.................................................................... 3-9

Measuring Voltage ........................................................................................ 3-10

Measuring Frequency .................................................................................... 3-10

Frequency Ranging........................................................................................ 3-11

Measuring Resistance.................................................................................... 3-11

2-Wire Resistance Measurement............................................................... 3-11

4-Wire Resistance Measurement............................................................... 3-12

Measuring Current......................................................................................... 3-13

Automatic Input Terminal Detection............................................................. 3-14

Diode / Continuity Testing ............................................................................ 3-15

Making a Triggered Measurement ................................................................ 3-16

Setting the Trigger Mode .......................................................................... 3-16

Connecting to an External Trigger............................................................ 3-16

Selecting a Function Modifier ........................................................................... 3-17

Relative Readings Modifier (REL)................................................................ 3-18

Decibels and Auto Power Modifier ............................................................... 3-18

Touch Hold Function (HOLD)...................................................................... 3-19

Minimum / Maximum Modifier (MIN MAX) .............................................. 3-20

Using the Function Modifiers in Combination.............................................. 3-21

Second Level Operations (Using the SHIFT Button).................................... 3-21

Compare Function (COMP)............................................................................... 3-22

Setting the Compare Range ........................................................................... 3-22

Using the Compare Function......................................................................... 3-22

List and Number Editors.................................................................................... 3-22

Using the List Editor ..................................................................................... 3-23

Using the Number Editor............................................................................... 3-24

Function Keys S1 – S6....................................................................................... 3-24

Power-Up Configuration.................................................................................... 3-25

Calibration ......................................................................................................... 3-25

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Operating the Meter from the Front Panel

Introduction 3

Introduction

The Meter can be controlled either by sending commands through its RS232
communication interface or through the front panel. This chapter explains the function
and use of the controls and indicators located on the front panel of the Meter. Operating
the Meter through its RS232 communication interface is covered in Chapter 4.

The front panel has three main elements: input terminals (on the left), dual display
(primary and secondary displays), and keypad. See Figure 3-1 for an overview of the
front panel and refer to Table 3-1 for descriptions of the front-panel features.

The front panel is used to:

• Select a measurement function (volts dc, volts ac, current dc, current ac,

resistance, frequency, and diode/continuity test) for the primary and/or secondary
displays

• Take a measurement and display a reading

• Select the manual or autorange mode

• Manually select a measurement range for the primary display

• Select function modifiers that cause the Meter to display relative readings,

minimum or maximum values, or to select the TouchHold
reading on the primary display

• Change the measurement rate (slow, medium, fast)

• Take a measurement and compare it against a tolerance range

• Use the editor to select from option lists, to enter a relative base, or to enter a

high (HI) or low (LO) range for the compare mode

• Configure the computer interface (RS-232)

• Send measurements directly to a printer or terminal through the RS-232 interface

®

function to hold a

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8808A

Users Manual

1

17

2W/4W

1000V
750V

LO

mA

HI

200mA

MAX

2

MAX

INPUT SENSE

V

1000V CAT I

600 V CAT II

1V

500 V pk

10 A

MAX

4

W

16

3 4

5-1/2 DIGIT MULTIMETER

8808A

HI

300V

LO

10 A

5

6789101112131415

eue02.eps

Figure 3-1. Front Panel

Table 3-1. Front-Panel Features

No. Name Description

A INPUT VZYR HI, LO Input terminals for Volts, 2-Wire and 4-Wire Ohms, and Hz

measurements. All measurements use the INPUT LO terminal
as a common input. The LO input is isolated and may be
safely floated up to 500 V peak above earth ground regardless
of the measurement type. 1000 V dc is the maximum voltage
rating between the INPUT HI and LO terminals.

B SENSE 4WZ HI, LO 4-wire Ohms measurement sense terminal

C C Compare function for determining if a reading falls within a

designated range of values

D abcdef For storage and retrieval of up to six test configurations

E CAL (recessed button) Calibrates Meter

F P Activates/deactivates standby mode for power savings

G Q Activates second level operation for function buttons

Locks the front panel operation during remote mode

H K Primary operation: Selects Meter print mode

Second level operation: Sets RS-232 communication
parameters (baud rate, parity, echo)

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Operating the Meter from the Front Panel

Table 3-1. Front-Panel Features (cont.)

No. Name Description

I J Primary operation: Sets the Meter’s measurement rate to slow,

medium or fast

Second level operation: Selects source for triggering
measurement

J I Primary operation: Selects Touch Hold function

Second level operation: Sets Touch Hold minimum response
level

K T Primary operation: Selects relative readings function to display

difference between relative base and input

Second level operation: Sets relative base

L W Primary operation: Selects dB measurement mode

Second level operation: sets dB reference impedance

Introduction 3

M N Stores the minimum and maximum inputs measured

N

F
D
A
E
B
O
G

O R Toggles between manual and autorange modes

P 10 A Input terminal for 10 A ac and dc current measurement

Q mA Input terminal for 200 mA ac and dc current measurement

Selects measurement function:

Frequency

DC voltage

AC voltage

DC current

AC current

Resistance (ohms)

Continuity / diode test (toggles)

Uand V increase and decrease the range for manual
ranging

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Dual Display

The Meter has a 5-1/2 digit vacuum fluorescent dual display. See Figure 3-2 and Table 3­2 for an overview of the display annunciators and indicators

The dual display is comprised of a primary display and a secondary display, which show
measurement readings, annunciators and messages. The annunciators indicate
measurement units and the Meter’s operating configuration.

The dual display allows you to see two properties for the input signal you are measuring.
The Meter alternates between properties, measuring the first property and showing it on
one display, and then measuring the second property and showing it on the other display.
(For more detail, see the “How the Meter Takes Dual Display Measurements” section in
Appendix A.)

If an input exceeds the full-scale value of the selected range, the Meter displays 0Lto
indicate an overload.

Primary Display

The primary display comprises the lower segment of the dual display, and consists of the
larger digits and annunciators. The primary display shows measurements taken using the
relative readings (REL), minimum maximum (MIN MAX), Touch Hold (HOLD), and
decibels (dB) function modifiers.

Secondary Display

The secondary display comprises the upper segment of the dual display, and consists of
the smaller digits and annunciators.

Function modifiers REL, HOLD, MIN MAX, and dB and the manual range mode cannot
be selected for the secondary display. The secondary display is either in autorange, or the
same range as the primary display if both displays are in the same function.

1 2 3

24

23

22

21

20

19

1718

4 5 76 8 9 1110 12

16

Figure 3-2. Display Annunciators and Indicators

13

14

15

eue01f.eps

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Operating the Meter from the Front Panel

Table 3-2. Display Annunciators and Indicators

No. Name Description

3

A

r

B

L

C

Ext Trig Meter is in external trigger mode

D

S Q is pressed and secondary function will be selected

E

REL

X Relative readings function modifier is selected

F

–

G

H

H

M

I

MAX and MIN Reading is maximum or minimum

J

AC DC Form of voltage displayed in secondary display

K

2x4 Wire

L

mV µmA kHz Mke Unit of measurement displayed in secondary display

M

R G

N

mV µmA Mke kHz Unit of measurement displayed in primary display

O

AC DC Form of voltage displayed in primary display

P

Slow, Medium, Fast Measurement rate selected (slow, medium, fast)

Meter is in remote mode (remotely controlled)

the front panel is locked out

Measurement value in secondary display is negative

Touch Hold function modifier is selected

Minimum maximum function modifier is selected

Resistance measurement method selected (2-wire or 4­wire)

Continuity test or diode test is selected

Q

–

R

Setup 8 annunciator Which configuration is currently selected

S

Print Meter is in RS-232 print-only mode

T

* (asterisk) Flashes for each Meter sample cycle

U

Auto Range Meter is in auto range mode

V

Manual Range Meter is in manual range mode

W

CAL Error Calibration attempt failed

X

Y

Measurement value in primary display is negative

High voltage is detected

Displays when voltage is >30 V dc or ac rms

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Rear Panel

See Figure 3-3 and Table 3-3 for an overview of the rear-panel features.

1 2 3

220

45

Figure 3-3. Rear Panel

Table 3-3. Rear-Panel Features

No. Name Description

A Line power terminal Connects Meter to power source via power cord

B Power switch Turns power on and off to the Meter

C Fuse holder and power line voltage

selector

D RS-232 terminal RS-232 and External trigger terminal. Connects Meter to

E Ground terminal Provides connection to ground

Houses fuses:

1/8 A slow fuse, 100/120 VAC

1/16 A slow fuse, 220/240 VAC

Provides means to select line power voltage:

100 Vac, 120 Vac, 220 Vac, 240 Vac

a host, serial printer or terminal, and provides external
trigger interface.

eue03.eps

Adjusting Meter Range

Ranging operations are performed using R, U, and V. Press R to toggle
between autorange and manual range modes. When autoranging is selected, Auto Range
is displayed. When manual ranging is selected, Manual Range is displayed.

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Operating the Meter from the Front Panel

In autoranging mode, the Meter automatically selects the next higher range when a
reading is greater than full-scale. If no higher range is available, 0L is displayed on the
primary or secondary display to indicate an overload. The Meter automatically selects a
lower range when a reading is less than 95 % of full-scale of the lower range.

In autoranging mode, pressing U or V changes the mode to manual ranging. If U
is pressed, the next higher range is selected (if there is one). If V is pressed, the next
lower range is selected.

In manual ranging mode, the range that is set when you enter the mode becomes the
selected range. The Meter remains in the selected range regardless of input. Manual
ranging can only be performed on readings shown on the primary display. The secondary
display is in autorange or when the primary and secondary displays are set to the same
function, the secondary display uses the same range as the primary display.

Selecting a Measurement Rate 3

Selecting a Measurement Rate

The Meter takes measurements at one of three user-selected rates: slow, medium, and
fast. Rate selection allows you to maximize measurement speed, which can affect
accuracy. The rate selected is shown in the primary display as Slow, Medium, or Fast.

Press J to step through the measurement rates. The rate selected applies to all basic
measurements except frequency. When frequency is measured, the rate is fixed at
4 measurements per second. Pressing J does not affect the frequency update rate.The
measurement rate is always fast for Diode and Continuity test.

Selecting a Measurement Function

To select a measurement function, press the applicable function button (See Table 3-1).
The applicable annunciator is displayed to indicate the selected function. (For example, to
measure dc voltage, press D. DC is displayed.)

To select ac + dc total rms readings, simultaneously press A and D for more than
two seconds; or simultaneously press B and E for more than two seconds.

If a reading is shown on the secondary display when a function button is pressed, the
secondary display turns off and that function is selected for the primary display.

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Measuring Voltage

The Meter is capable of measuring voltage up to 1000 V dc and 750 V ac.

To avoid possible damage to the Meter, do not apply voltage to
the Meter’s inputs until the test leads are properly connected
and the proper voltage function is selected.

To perform a voltage measurement:

1. Connect test leads between the Meter and the circuit under test as shown in

Figure 3-4.

2. Press D to measure dc voltage or A to measure ac voltage.

The Meter selects the appropriate range in the autorange mode. The function and
measurement are displayed.

Circuit
Under

Test

W Caution

2W/4W

HI

1000V
750V

LO

200mA

MAX

mA

INPUT SENSE

V

1000V CAT I

MAX

600 V CAT II

1V

500 V pk

10A

MAX

4

W

HI

300V

LO

10 A

3-10

Measuring Frequency

The Meter measures the frequency of ac signals between 20 Hz and 1 MHz.

To perform a frequency measurement:

1. Connect test leads between the Meter and the circuit under test as shown in

Figure 3-4.

2. Press F to measure the frequency of the ac signal.

The function and measurement are displayed.

Figure 3-4. Voltage and Frequency Measurement

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Operating the Meter from the Front Panel

Selecting a Measurement Function 3

Frequency Ranging

Frequency measurements are automatically ranged so that a frequency measurement is
always displayed with maximum resolution.

To select a range manually, press F to select the frequency function, and then press
U or V to select a range manually. Manual ranging can be performed on readings
displayed in the primary display only.

If you manually select a frequency range and the measurement exceeds the full-scale
value of that range, 0L is displayed to indicate an overload. Refer to the “Electrical
Specifications” section in Chapter 1 for frequency ranges and full-scale values.

Measuring Resistance

The Meter offers 2-wire and 4-wire ohms measurement. Press O to toggle between 2­wire and 4-wire measurement modes. The Meter displays 2*4 Wire at 2 wire or 2x4 wire
resistance measurement and displays 4 Wire at 4 wire resistance measurement.

2-Wire Resistance Measurement

To perform a 2-wire resistance measurement:

1. Connect test leads between the Meter and the circuit under test as shown in

Figure 3-5.

2. If required, press O to select 2-wire resistance measurement mode. 2*4 Wire is

displayed.

The function and measurement are displayed.

INPUT SENSE

V

4

1000V CAT I

600 V CAT II

1V

500 V pk

10A

MAX

W

HI

300V

LO

10 A

eue11.eps

Figure 3-5. 2-Wire Resistance Measurement

2W/4W

HI

1000V

MAX

750V

LO

200mA

MAX

mA

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4-Wire Resistance Measurement

The Meter incorporates two methods of making a four-wire resistance measurement. The
traditional method is to use four meter leads to connect the Meter to the resistance to be
measured. The optional 2X4 Wire test leads simplifies the four-wire measurement so you
only have to plug in two test leads to the Input HI and LO connectors of the meter.

To perform a 4-wire resistance measurement using four test leads:

1. Connect test leads between the Meter and the circuit under test as shown in

Figure 3-6.

2. If required, press O to select 4-wire resistance measurement mode. 4 Wire is

displayed.

The function and measurement are displayed.

2

2

2W/4W

1000V
750V

HI

MAX

LO

200mA

MAX

mA

INPUT SENSE

V

4

1000V CAT I
600 V CAT II

1V

500 V pk

10A

MAX

W

HI

300V

LO

10 A

3-12

Figure 3-6. 4-Wire Resistance Measurement

To make a four-wire resistance measurement using Fluke’s 2X4 test leads:

1. Connect the test leads to the Meter’s input connectors as show in Figure 3-7.

2. Press N. 2*4 Wire is displayed.

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Operating the Meter from the Front Panel

Ground tab

Figure 3-7. Input Connections for 4-Wire Ohms Using 2x4 Wire Leads

Selecting a Measurement Function 3

INPUT SENSE

V

4

1000V CAT I
600 V CAT II

1V

500 V pk

10A

MAX

W

HI

300V

LO

10 A

eue26.eps

2W/4W

HI

1000V

MAX

750V

LO

200mA

MAX

mA

Measuring Current

To avoid blowing the current fuse or damaging the Meter, do
not apply power to the circuit under test until test leads are
properly installed to the appropriate input terminals. For current
measurements above 200 mA, install the test leads into the 10 A
and LO terminals only.

The Meter is capable of making ac and dc current measurements up to 10 A.

To perform a current measurement:

1. Turn off power to the circuit under test.

2. Connect test leads between the Meter and the circuit under test.

3. If the circuit current is unknown, start by using the 10 A and LO terminals.

4. If the measurement is expected to be below 200 mA, connect the test leads to the

200 mA and LO terminals only and remove any leads in the 10 A terminal. See
Figure 3-8.

5. For measurements expected to be 200 mA to 10 A, connect the test leads to the

10 A and LO terminals only. See Figure 3-9.

6. Press B to measure ac current or press E to measure dc current.

7. Apply power to the circuit under test.

W Caution

The Meter selects the appropriate range in autorange mode. The function and
measurement are displayed.

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Users Manual

V AC

V AC

I < 200 mA

I > 200 mA

and

I < 10 A

Figure 3-8. Current Measurement <200 mA

2W/4W

2W/4W

HI

1000V

MAX

750V

LO

200mA

MAX

mA

HI

1000V

MAX

750V

LO

200mA

MAX

mA

INPUT SENSE

V

4W

1000V CAT I

600 V CAT II

1V

500 V pk

10A

MAX

INPUT SENSE

V

4W

1000V CAT I

600 V CAT II

1V

500 V pk

10A

MAX

300V

300V

HI

LO

10 A

eue13.eps

HI

LO

10 A

eue14.eps

Figure 3-9. Current Measurement 200 mA to 10 A

Automatic Input Terminal Detection

For ac and dc current measurement functions, the Meter automatically detects the signal
input between the mA and 10 A input terminals. A front-panel annunciator indicates
whether the Meter is in the mA or A ranges.

If a test lead is inserted in to the mA input terminal and there isn’t a test lead in the 10 A
terminal, then only the 200 µA to 200 mA ranges are selectable. If the 10 A terminal has
a test lead, then only the 2 A and 10 A ranges are selectable.

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Operating the Meter from the Front Panel

Selecting a Measurement Function 3

Diode / Continuity Testing

Press G to toggle between the continuity and diode test functions for the primary
display. (These functions cannot be selected for the secondary display.)

To perform a continuity test:

1. If required, press G to select the continuity test function.

2. Connect the test leads between the Meter and the circuit under test as shown in

Figure 3-10.
The beeper emits a continuous tone if the input is below 20 Ω.

To perform a diode or transistor junction test:

1. If required, press G to select the diode test function.

2. Connect the test leads between the Meter and the diode or transistor junction as

shown in Figure 3-11.

The forward voltage of the semiconductor junction (or junctions) is measured.
Readings are displayed in the 2 V range at the fast measurement rate. The Meter
displays 0L if the input is above +2 V.

Figure 3-10. Continuity Test

2W/4W

HI

1000V

MAX

750V

LO

200mA

MAX

mA

INPUT SENSE

V

4W

1000V CAT I

600 V CAT II

1V

500 V pk

10A

MAX

300V

HI

LO

10 A

eue15.eps

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Figure 3-11. Diode Test

Making a Triggered Measurement

The Meter features a trigger function that allows you to select a measurement trigger
source. When the trigger mode is set to 3 or 5, the delay between receiving the trigger
and the start of a measurement is 400 ms. Refer to Chapter 1 for trigger delay response
specifications. Upon completion of each measurement, a “measurement-complete” signal
(low-true pulse) is sent to the external trigger terminal on the rear panel. See the
“Electrical Specifications” section in Chapter 1 for information on this signal.

2W/4W

750V

HI

1000V

MAX

LO

200mA

MAX

mA

INPUT SENSE

V

4

1000V CAT I

600 V CAT II

1V

500 V pk

10A

MAX

W

HI

300V

LO

10 A

eue16.eps

The following sections discuss triggering the Meter automatically using its internal
trigger, or externally using the trigger key on the front panel and the trigger terminal on
the rear panel.

Setting the Trigger Mode

There are five possible sources for triggering a measurement:

• Mode 1 is automatic. Measurements are triggered internally and are continuous

and occur as fast as the configuration will allow.

• Mode 2 is triggered without delay using J.

• Mode 3 is triggered with delay using J.

• Mode 4 is triggered without delay by an external signal.

• Mode 5 is triggered with delay by an external signal.

To select a trigger source:

1. Press Q then J.

2. Press U or V to choose the trigger mode.

3. Press R and hold for 2 seconds to save the selected mode.

Connecting to an External Trigger

The Meter provides two external trigger connection methods for different operation
modes. Table 3-4 shows the layout of the TRIG/IO_RS232 connector.

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Operating the Meter from the Front Panel

Selecting a Function Modifier 3

An external TTL signal on pin 9 will trigger a measurement cycle. Alternatively, pin 9 of
the RS-232 interface can be connected to pin 1 through an external switch. See Figure 3-

12. A measurement cycle is trigger when the switch is closed and the +5 volts from pin 1
is applied to pin 9. The trigger event occurs on the rising edge of the signal applied to
pin 9.

Table 3-4. RS-232 Pin Out

1234

678 9

Pin # Description Pin # Description

1 +5 V OUT 2 RS-232 RXD

3 RS-232 TXD 5 RS-232 GND

6 Trigger Out 9 Trigger In

5

eue23.eps

Figure 3-12 shows a method for using the +5 V OUT (pin 1) signal with an external
switch to trigger the Meter.

+5 V Out (Pin 1)

Trig In (Pin 9)

Figure 3-12. External Trigger Circuit

eue24.eps

Selecting a Function Modifier

This section describes the function modifiers available with the Meter. Function
modifiers are actions that the Meter performs on an input before a reading is displayed
(for example, a comparison to another value). Function modifiers can be used in
combination. See the “Using Function Modifiers in Combination” section later in this
chapter.

To use a function modifier, press a measurement function button to select that function,
and then press the function modifier button to modify that function. (For example, press
D to select dc voltage measurement, and then press I to select the Touch Hold
function to hold the results of your measurement). Note that modified readings are shown
on the primary display only.

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After a function modifier is selected, pressing any function button turns off all modifiers,
causes the secondary display to go blank, and returns unmodified readings to the primary
display.

Relative Readings Modifier (REL)

The relative readings modifier displays the difference between the relative base and the
input measurement. For example, if the relative base is 15.000 V and the present input
measurement is 14.100 V, the display will show -0.900. Readings are shown on the
primary display.

XW Warning

To avoid electrical shock or damage to the Meter, do not touch
the input terminals or test leads during measurement. Relative
readings may not indicate the presence of dangerous voltages
at the input terminals or test leads.

Note

Relative readings modifier cannot be selected if the display shows 0L
(overload) or is blank.

To make a relative reading, press T to select the relative readings modifier. The last
valid reading taken is stored as the relative base, the primary display zeroes out, and
RELX is shown on the primary display. (The secondary display is unaffected.)

To edit the relative base, use the number editor as described in the “Using the Number
Editor” section later in this chapter.

Selecting the relative readings modifier turns off autoranging and locks the present range.
Make sure you are in the correct range before pressing T. If you press Uor V
after pressing T, the Meter exits the relative readings mode.

Decibels and Auto Power Modifier

The decibels modifier takes a voltage measurement, converts it to dBm (measure of
decibels relative to one milliwatt), and displays the result on the primary display.

Press dB to toggle in and out of the decibels modifier. When the decibels modifier is
selected, "dB" is shown on the primary display.

Decibels can be selected only when a voltage function is selected on the primary display
(volts ac, volts dc, or volts ac + dc). Decibels are always displayed in a single, fixed
range with 0.01 dB resolution. However, the basic measurement itself (volts ac for
example) autoranges.

A voltage measurement is converted to dBm using the following formula (value is the
measurement value):

dBm

The reference impedance can be set to any of 21 reference impedances listed in Table 3-5
by using the list editor as described in the "Using the List Editor" section later in this
chapter.

2

=

⎜
⎝

⎛
⎜

log10

Value

*1000

R

ref

⎞
⎟

⎟

.

⎠

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Operating the Meter from the Front Panel

Impedance Impedance Impedance

8000 Ω 300 Ω 93 Ω

1200 Ω 250 Ω 75 Ω

[1]

1000 Ω

900 Ω 135 Ω 16 Ω

800 Ω 125 Ω 8 Ω

600 Ω 124 Ω 4 Ω

500 Ω 110 Ω 2 Ω

[1] Voltage annunciator lit

[2] Audio power readings possible

150 Ω 50 Ω

Table 3-5. dBM Reference Impedances

Selecting a Function Modifier 3

[2]

[2]

[2]

[2]

To access the reference impedance list, press Q then press W. The reference
impedance currently selected is displayed, along with the "db" and "ohm" annunciators.
Press U or V to scroll to the desired value, then press R to select a reference
impedance and return the primary display to the measurement function. Press any
function or modifier button to exit the reference impedance list without selecting a new
value.

Setting the dB reference resistance to 16, 8, 4, or 2 ohms allows you to use the Meter to
calculate audio power. After the reference resistance has been set to 16, 8, 4, or 2 ohms,
press W twice to select the audio power modifier. Power annunciator will be displayed.

The following equation is used to make a power calculation (volts is the measurement
value):

Touch Hold Function (HOLD)

The Touch Hold function holds the results of your measurements on the display. Touch
Hold is helpful in difficult or hazardous circumstances when you want to keep your eyes
fixed on the probes and reading the display only when it is safe or convenient to do so.
When a new, stable reading is detected, a beep is emitted and the display is automatically
updated.

To select the Touch Hold function, press I. H is displayed. In Touch Hold, each
time you press I, a new reading is displayed. To exit the Touch Hold function, press
and hold I for 2 seconds.

If you are in the autorange mode when Touch Hold is selected, you will autorange to the
correct range. If you are in the manual range mode when Touch Hold is selected, you will
be in the fixed range you were in when Touch Hold was selected.

2

Volts

PowerAudio

=

R

ref

The Touch Hold function can be combined with the minimum/maximum modifier to hold
and update only when a new minimum or maximum value is detected. To force the
display to update, with Touch Hold selected press I for less than 2 seconds.

The Meter allows you to choose the minimum response level needed for Touch Hold to
capture and display a measurement. You can choose from the following four response
levels:

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• Level 1 (5 % of range)

• Level 2 (7 % of range)

• Level 3 (8 % of range)

To change the response level, press Q and I. The response level currently selected
(1, 2, 3 or 4) appears on the primary display. Press U or V to step to the desired
response level, then press R for two seconds to set the level and return to the primary
display. You can return to the primary display without changing the response level by
pressing any button except R, U or V.

Minimum / Maximum Modifier (MIN MAX)

The minimum/maximum (MIN MAX) modifier stores the minimum and maximum
inputs of your measurements.

Selecting the MIN MAX modifier turns off autoranging and locks in the present range, so
make sure you are in the correct range before pressing N. If you press U or V
after pressing N, the Meter exits the MIN MAX modifier mode.

To store the minimum and maximum inputs:

1. Press N to select the MIN MAX modifier.
When N is first pressed, the minimum and maximum values are set to the

reading displayed. MAX is shown and the display indicates the latest maximum
reading.

2. Press N again to display the minimum reading. MIN is shown and the display
indicates the latest minimum reading.

3. Press N again to display either the minimum or maximum reading. M
is shown and the display indicates either the minimum or maximum reading.

4. To exit MIN MAX mode, press and hold N for 2 seconds.

5. To observe the actual readings without resetting the stored values, press Q and
then select the same measurement function that you selected for the primary
display.

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Selecting a Function Modifier 3

Using the Function Modifiers in Combination

You can use multiple function modifiers simultaneously.

Selected modifiers are evaluated in the following order: Touch Hold,
minimum/maximum, and then relative readings. The Meter first looks for a stable
measurement for Touch Hold, then determines if the measurement is a new minimum or
maximum value, and then subtracts the relative base from the measurement.

When using multiple modifiers, the order in which you select the modifiers affects how
the modes will respond. For example, if you are in minimum/maximum mode, if you
press T, the value currently displayed becomes the relative base. Pressing N then
displays the difference between the minimum and maximum values. Additionally, if you
are in the relative readings mode, pressing N displays the difference between the
relative base and the minimum or maximum value (as applicable).

Second Level Operations (Using the SHIFT Button)

Pressing Q causes the next button pushed to perform its second level operation. Second
level operations are printed in red on their respective buttons. When Q is pressed,
S is displayed.

See Table 3-6 for descriptions of second level operations and the buttons used to invoke
the operations.

Buttons Description

Q then A
Q then D
Q then B
Q then E
Q then F
Q then O
Q then I
Q then T

Q then K
Q then J
Q then Q
Q then V

Q then U

Q and T
Q and J

Table 3-6. Second Level Operations

Shows volts ac reading in secondary display

Shows volts dc reading in secondary display

Shows amperes ac reading in secondary display

Shows amperes dc reading in secondary display

Shows frequency reading in secondary display

Shows ohms reading in secondary display

Sets Touch Hold sensitivity threshold

Edits relative base and places the Meter into relative readings mode (see
the “List and Number Editor” section later in this manual)

Sets communication parameters (RS-232), including baud rate, parity, echo

Sets the trigger mode.

Turns off secondary display (primary display unaffected)

Edits compare mode low point (see the “Using the Compare Function”
section later in this manual)

Edits compare mode high point (see the “Using the Compare Function”
section later in this manual)

[1]

[1]

In relative mode, toggles display of relative base in secondary display

Displays software version

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Table 3-6. Second Level Operations (cont.)

Buttons Description

Q and V

Q and U

[1] Hold both buttons for 2 seconds.

[1]

[1]

In COMP mode, stores value on primary display as LO compare point (see
the “Using the Compare Function” section later in this manual)

In COMP mode, stores value on primary display as HI compare point (see
“Using the Compare Function”)

Compare Function (COMP)

The Meter has a compare function (COMP) that provides an easy way to determine if a
reading falls within a designated range of values. The compare function can be used with
any function modifier.

Setting the Compare Range

Before selecting the compare function, you need to set the tolerance range against which
the reading that will be compared. This can be done in any of the following three ways:

• Press C to enter the compare function mode. The reading displayed when you
enter the mode can be set to the high or low threshold. To set the reading as the
high limit, press and hold Sand U for 2 seconds. To set the reading as the
low limit, press and hold Sand V for 2 seconds. The Meter beeps to
indicate the limit has been set. If the display is blank or shows 0L (overload), the
limit could not be set and the high and low limits remain as previously set.

• Use the number editor as described in the “Using the Number Editor” section
later in the chapter. (Before entering the number editor, be sure you are in the
appropriate range.) The decimal point and input range are fixed according to the
range in the editor.

• Use the computer interface commands COMPHI and COMPLO to set the high and
low compare points remotely. See the “Compare Commands and Queries”
section in Chapter 4.

Using the Compare Function

To select the compare function, press C. When the compare function is first selected,
the Touch Hold function is also activated and H is displayed. To turn off Touch
Hold, press and hold I for 2 seconds. The secondary display will then update with
each new reading.

When a stable value is detected, the Meter beeps if hold is on and the reading is shown in
the primary display. If the value is within the range you set, PASS is shown in the
secondary display. If the value is not within the set range, HI or L0 is shown as applicable
in the secondary display.

List and Number Editors

The Meter has a list editor and number editor. The list editor allows you to scroll through
and select from a list of options. The number editor allows you to enter or edit a numeric
value.

Editing is performed in the primary display. Normal operation of the Meter is interrupted
when either editor is invoked. If a computer interface command is received by the Meter
during editing, the edit is aborted and the Meter returns to normal operation. The item
being edited is not changed.

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Operating the Meter from the Front Panel

List and Number Editors 3

Using the List Editor

The list editor is used to select the options described in Table 3-7. You may abort an edit
and return to normal operation at any time by pressing Q.

To use the list editor:

1. Select the option list that you want to edit by pressing the applicable button(s) as
indicated in Table 3-7. The option list type is shown in the secondary display and
the associated options are shown in the primary display.

2. Press Uor V to step through the options. (Hold either button to scroll
through the options.) As you step through the list, only the selected option is
shown in normal intensity (bright) while the others are dim.

3. When the desired option is shown, press R to select it. The selected option is
then displayed in normal intensity (bright).

Table 3-7. List Editor Options

To Set Buttons Options Annunciator

Touch Hold minimum
response level

RS-232 print-only mode
(if RS-232 interface is
selected)

RS-232 baud rate Q then K 300,600,1200,2400,

Data bits

Parity options

Stop bit

Echo mode

Trigger mode Q then J 1, 2, 3, 4, 5 tri

Q then I

K 0,1,2,5,10,20,50,100,

1 = 5 % of range

2 = 7 % of range

3 = 8 % of range

200, 500,1000,2000,
5000,10000,20000, or
50000

4800, 9600, or 19200

8

7

E = Even

Odd = Odd

No = None

1

2

On

Off

HoLd

Print

baud

data

Par

StoP

Echo

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Using the Number Editor

Use the number editor to edit the relative base for the relative readings modifier and to set
the high and low threshold values for the compare function.

Note that you can abort the number editor and return the Meter to normal operation by
pressing Q.

To use the number editor:

1. Select the number to be edited by pressing the applicable buttons as shown in
Table 3-8.

The last number entered or value measured is displayed with the leftmost digit
bright and the remaining digits dim. (If the number is negative, the minus sign is
bright.) Related annunciators are displayed.

Table 3-8. Number Editor Options

Buttons Number Editor Invoked for

Q then V Low threshold limit for compare mode

Q then U High threshold limit for compare mode

Q then T Relative base for relative readings modifier

2. Press U or V to increment or decrement the highlighted digit to the desired
number (from 0 to 9). When the digit is set to the desired number, press S1
through S6 to select the next digit to edit. S1 corresponds to the left-most digit
and S6 corresponds to the right-most digit. Repeat this step until you have set all
the digits to their desired values.

3. When the value has been set, press C to toggle the sign between positive and
negative. If the sign is positive, the negative sign (–) is off. If the sign is negative,
the negative sign (–) is on.

4. For Low/High threshold, press R to select the desired range for threshold
values. The range goes one step up by pressing R once. If the range reaches
the top range, the next press wraps back to range 1 and the value will be cleared.

5. When you are finished editing the number, press and hold R for 2 seconds to
store the value.

Function Keys S1 – S6

Function keys a through f allow you to save and recall up to six measurement
configurations. This helps speed the process of setting up the Meter, and is particularly
useful if you repeatedly need the same configurations.

To save the present configuration, press Q and then press the function key to which
you want to store the configuration.

To recall a configuration, press the applicable function key. A beep sounds when the
configuration is ready for use, and Setup

8 indicates the number of the latest stored

configuration.

When a configuration is stored, it includes the following:

• Measurement function and initial range on primary display

• Measurement function on secondary display

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Operating the Meter from the Front Panel

Power-Up Configuration 3

• Range mode on primary display (manual or autorange)

• Measurement rate (slow, medium, fast)

• Dual display status (active or inactive)

• Any combination of selected function modifiers

• Touch Hold level (1, 2, 3, 4)

• Last recorded minimum and maximum values for MINMAX modifier

• Last recorded relative base

• Relative base shown in secondary display (enabled or disabled)

• Last HI-LO settings in compare mode

• Trigger mode (1, 2, 3, 4, 5)

• Echo setting (on or off)

• dB and dB reference

• RS-232 settings

• PRINT mode

• Data format (with or without UNIT) sending through the RS-232

Power-Up Configuration

When the Meter is turned on and the power-up sequence is complete, the Meter defaults
to the power-up configuration listed in Table 3-9.

The RS-232 baud rate, parity, and echo mode are not changed when power is cycled off
and on. These parameters remain as set until changed by the user.

Table 3-9. Factory Power-Up Configuration

Parameter Configuration

Function setting DC volts

Range mode Autorange

Reading rate Slow (2.5 readings/second)

Touch Hold sensitivity level 1 (5 % of reading)

High/low values for Compare mode (COMP) 0

Minimum and maximum values in MIN MAX modifier 0

Relative base 0

Relative base in secondary display Disabled

Trigger type 1 (Internal)

Trigger type 0

Calibration

Refer to the 8808A Calibration Manual for instructions on calibrating the Meter.

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Chapter 4

Operating the Meter Using the Computer

Interface

Title Page

Introduction........................................................................................................ 4-3

Local and Remote Operations ....................................................................... 4-3

Computer Interfaces ...................................................................................... 4-3

Preparing the Meter for Operations via the RS-232 Interface ........................... 4-3

Setting Communication Parameters (RS-232) .............................................. 4-3

RS-232 Print-Only Mode .............................................................................. 4-4

Cabling the Meter to a Host or Printer (RS-232)........................................... 4-5

Character Echoing and Deletion.................................................................... 4-6

Device Clear Using ^C (CNTRL C).............................................................. 4-6

RS-232 Prompts............................................................................................. 4-6

Getting Started with an Installation Test ........................................................... 4-6

Installation Test for RS-232 Operation ......................................................... 4-6

If Test Fails.................................................................................................... 4-7

How the Meter Processes Input ......................................................................... 4-7

Input Strings .................................................................................................. 4-7

Input Terminators .......................................................................................... 4-7

Sending Numeric Values to the Meter .......................................................... 4-8

Sending Command Strings to the Meter........................................................ 4-8

How the Meter Processes Output....................................................................... 4-8

Triggering Output .............................................................................................. 4-9

External Triggering from the Front Panel ..................................................... 4-9

Setting the Trigger Type Configuration ........................................................ 4-10

External Trigger via the Computer Interface................................................. 4-10

Status Registers.................................................................................................. 4-10

Event Status and Event Status Enable Registers ........................................... 4-12

Status Byte Register ...................................................................................... 4-14

Reading the Status Byte Register .................................................................. 4-15

Computer Interface Command Set..................................................................... 4-15

Common Commands ..................................................................................... 4-16

Function Commands and Queries.................................................................. 4-17

Function Modifier Commands and Queries .................................................. 4-19

Range and Measurement Rate Commands and Queries................................ 4-21

Measurement Queries.................................................................................... 4-23

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Compare Commands and Queries ................................................................. 4-24

Trigger Configuration Commands................................................................. 4-24

Miscellaneous Commands and Queries......................................................... 4-25

RS-232 Remote / Local Configurations ........................................................ 4-25

RS-232 Save / Recall System Configurations ............................................... 4-26

Sample Program Using the RS-232 Computer Interface................................... 4-27

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Operating the Meter Using the Computer Interface

Introduction 4

Introduction

This chapter describes how to set up, configure and operate the Meter via the RS-232
computer interface on the Meter’s rear panel. The Meter can be operated from a host (a
terminal, controller, PC, or computer) by sending commands to the Meter through its
computer interface.

An annotated sample program illustrating the use of the RS-232 computer interface is
provided at the end of this chapter. Refer to Chapter 3 for complete descriptions of all
Meter functions and features.

This chapter assumes that you are familiar with the basics of data communication and
RS-232 interface.

Local and Remote Operations

When the Meter is operated from a host, it is said to be operated remotely. When the
Meter is operated from its front panel, it is said to be operated locally.

Most operations that can be performed locally can also be performed remotely using the
computer interface. Some operations, like setting communications parameters for the RS­232 interface operations, can only be performed from the front panel.

Computer Interfaces

The Meter comes equipped with an RS-232 (serial) interface. Using the interface turns
the Meter into a fully programmable instrument that can be integrated into an automated
instrumentation system.

Preparing the Meter for Operations via the RS-232 Interface

The RS-232 interface allows ASCII asynchronous serial communication between the
Meter and a host, serial printer or terminal.

Setting Communication Parameters (RS-232)

Table 4-1 provides the RS-232 communication parameters factory settings. Setting RS­232 communication parameters is only performed through the front panel.

In order for the Meter and host to communicate via the RS-232 interface, the
communication parameters of the Meter must match those of the host. If the
communications parameters of the host and Meter do not match, set the appropriate baud
rate and parity parameters as follows:

1. Press P to turn the Meter on.

2. Press Q then K. The baud rate currently selected is shown in the primary

display and baud is shown in the secondary display.

3. Press U or V to scroll to the desired baud, and then press R to set the

RS-232 baud rate.

4. Press U or V to scroll to the desired data bit (7 or 8) selection, then press

R to set parity. Echo appears on the secondary display, and 0n or 0FF appears
on the primary display.

5. To select an Echo mode, press U or V to select On or OFF, and then press

R to set the selected Echo state. When Echo is on, each command sent to the
Meter over the RS-232 interface is echoed to the host's display screen. When
Echo is off, commands are not echoed.

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6. Press R to review the settings. When you are ready to accept the settings,

press and hold R.

Table 4-1. RS-232 Communication Parameters Factory Settings

Parameter Factory Setting

Interface RS-232 (Print-only rate set to 0)

Baud rate 9600

Parity None (parity bit 0)

Number of data bits 8 (7 data bits plus 1 parity bit)

Number of stop bits 1

Echo Off

RS-232 Print-Only Mode

The print-only mode is used to send measurements to a printer or terminal automatically.

While the Meter will respond to remote commands during print-only operations, Fluke
recommends first setting the Meter's echo mode to OFF. This prevents mixing echoed
command characters and incoming data. Refer to the “Setting Communication
Parameters (RS-232)” section earlier in this chapter.

In the print-only mode, the Meter sends every N-th reading shown on the primary and/or
secondary displays out the RS-232 port, where N is the print rate. The print rate is
selected from the available values described in Table 4-2. The duration between outputs
is determined by the print rate and reading rate of the Meter. The minimum rates are 2.5/s
at slow rate, 20.0/s at medium rate, and 100.0/s at fast rate. The output is formatted as one
measurement per line from the primary display, or two measurements per line from the
primary and secondary displays.

Perform the following procedure to select the print-only mode and to set the print rate (N):

Note

For frequency measurements, the reading rate is fixed at four readings per
second. The reading rate is always fast for Diode and Continuity tests.

1. Press P to turn the Meter on.

2. Press K. If the RS-232 interface is selected, Print is shown and the list editor is

invoked on the print rate list.

3. Press U or V to scroll to the desired print rate as shown in Table 4-2, and

press and hold R for two seconds to select that rate. (Note that a print rate of
0 disables the print-only mode.) The Meter is now configured for RS-232 print­only operations. The Meter exits the list editor and returns to normal operation.

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Operating the Meter Using the Computer Interface

Table 4-2. Print Rates in RS-232 Print-Only Mode

Preparing the Meter for Operations via the RS-232 Interface 4

Rate

(N)

1 0.4 0.05 0.01 0.01

2 0.8 0.1 0.02 0.01

5 2.0 0.25 0.05 0.03

10 4.0 0.5 0.1 0.07 0.01

20 8.0 1.0 0.2 0.13 0.02

50 20.0 2.5 0.5 0.33 0.04 0.01 0.01

100 40.0 5.0 1.0 0.67 0.08 0.02 0.01

200 80.0 10.0 2.0 1.33 0.17 0.03 0.02

500 200.0 25.0 5.0 3.33 0.42 0.08 0.06 0.01

1000 400.0 50.0 10.0 6.67 0.83 0.17 0.11 0.01

2000 800.0 100.0 20.0 13.33 1.67 0.33 0.22 0.03 0.01

5000 2000.0 250.0 50.0 33.33 4.17 0.83 0.56 0.07 0.01

10000 4000.0 500.0 100.0 66.67 8.33 1.67 1.11 0.14 0.03

20000 8000.0 1000.0 200.0 133.33 16.67 3.33 2.22 0.28 0.06

Seconds between Outputs Minutes between Outputs Hours between Outputs

Slow Medium Fast Slow Medium Fast Slow Medium Fast

50000 20000.0 2500.0 500.0 333.33 41.67 8.33 5.56 0.69 0.14

Cabling the Meter to a Host or Printer (RS-232)

The Meter communicates with a host through a DB-9 interface connector on the rear
panel of the Meter. A connector pinout for the RS-232 interface is provided on the rear of
the Meter.

Note

When connecting the Meter to the host or terminal, use a cable appropriate
to your application. It is recommended that you use a cable that is less than
50 feet long (1 meters), as this will help prevent performance degradation.
Longer cables can be used if the load capacitance at the interface point
(including signal terminator) is less than 2500 pf.

To connect the Meter to a personal computer (with DB-9 connector), use a Fluke RS43
Null modem cable. Refer to Table 1-3.

To connect the Meter to a specific brand of RS-232 printer, use the cable that would be
used to connect that printer to an RS-232 port on a personal computer with a DB-9
connector.

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Character Echoing and Deletion

When the Meter is operated via the RS-232 interface, you can control whether characters
are echoed to the host's display screen.

When Echo is on, characters sent to the Meter are echoed on the host's display screen and
prompts are returned. When Echo is off, characters are not echoed, and prompts are not
returned. To set the Echo parameter, refer to the “Setting Communication Parameters
(RS-232)” section earlier in this chapter.

If you send a character to the Meter over the RS-232 interface directly from a keyboard,
pressing the <BACKSPACE> key deletes the previous character. A backspace is echoed
to the display screen if Echo is on.

Device Clear Using ^C (CNTRL C)

^C (CNTRL C) causes “=>” followed by a carriage return and line feed to be output.

RS-232 Prompts

When the host sends a command to the Meter over the RS-232 interface, the Meter parses
the command, executes it, returns a response (if appropriate), and then sends one of the
following prompts:

=> No errors detected. Command was successfully parsed and executed. The

interface is ready for another command.

?> Command error detected. Command was not executed because it was not

understood. For example, the Meter received an input string that contained a
syntax error.

!> Execution error or device-dependent error detected. Command was understood,

but not executed. For example, user attempted to use FREQ to perform a VDC
measurement.

Getting Started with an Installation Test

After the Meter is cabled to a host per “Cabling the Meter to a Host or Printer (RS-232)”
and is prepared to communicate with the host via the RS-232 interface, test the system as
follows to verify that it is operational.

Installation Test for RS-232 Operation

This procedure confirms that the Meter is properly set up and cabled for remote
operations:

1. Press P to turn the Meter on.

2. Verify that the computer interface parameters (baud, parity, etc.) are set correctly.

3. Turn the host on.

4. Type *IDN? and press Enter.

5. Verify that the Meter sends the following response:

FLUKE, 8808A, nnnnnnn, n.n Dn.n

Where nnnnnnn is the Meter’s serial number; n.n is the main software
version; and Dn.n is the display’s software version.

6. If the Meter does not respond as indicated, refer to the “If Test Fails” section.

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Operating the Meter Using the Computer Interface

If Test Fails

If the Meter does not respond as indicated in the “Installation Test for RS-232 Operation”
section, perform the following:

1. Ensure all cables are properly connected. See the “Cabling the Meter to a Host or

Printer (RS-232)” section earlier in this chapter.

2. Ensure that the communication parameters (baud rate, parity, etc.) on the Meter

and host are identical. See the “Setting Communication Parameters (RS-232)”
section earlier in this chapter.

How the Meter Processes Input 4

How the Meter Processes Input

The following sections describe how the Meter processes input received from a host or
stand-alone terminal.

Note

In this Chapter, “input” means a string sent to the Meter from a host, and
“output” means a string sent to the host from the Meter through the
computer interface.

Input Strings

The Meter processes and executes valid input strings sent by the host. A valid input string
is one or more syntactically correct commands followed by an input terminator.

When the Meter receives input, it stores it in a 50-byte input buffer.

Input strings received over the RS-232 interface are not executed or
checked for proper syntax until an input terminator is received or the input
buffer becomes full.

The Meter accepts alphabetic characters in uppercase and lowercase. If a command
cannot be understood, the command and the rest of the command line are ignored.

Input Terminators

When the Meter receives an input terminator, it executes commands on a first-in first-out
basis as entered since the last terminator was received.

As input characters are processed and executed, space is made available in the input
buffer for new characters. In RS-232 applications, if a communication error (parity,
framing, overrun) is detected, a device-dependent error is generated and the input string
is discarded. If the Meter's input buffer becomes full when it is used with the RS-232
interface, a device-dependent error is generated (see “Event Status and Event Status
Enable Register”) and the input string is discarded.

Valid terminators for the RS-232 interface are:

Note

• CR (Carriage Return)

• LF (Line Feed

• CR LF (Carriage Return/ Line Feed)

In some instances, a terminator is automatically transmitted at the end of the host’s output
string (the Meter's input string).

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Sending Numeric Values to the Meter

Numeric values can be sent to the Meter as integers, real numbers, or real numbers with
exponents, as shown in the following examples:

[phone] Sends the signed integer “12345689”

-1.2345E2 Sends “-1.2345E2” or “-123.45”

Sending Command Strings to the Meter

Observe the following rules when you construct strings to be sent to the Meter over the
computer interface:

• Rule 1: Read meter's output buffer once for each query command.

The Meter’s output buffer is cleared after it has been read. This prevents previously
read data from being read a second time by mistake. If you attempt to read the
Meter’s output buffer twice without an intervening query, the Meter will not respond
to the second read.

• Rule 2: Read query responses before sending another command string.

Output data remains available in the output buffer until the host reads it or until the
next command string is received by the Meter. This means the host must read the
Meter’s output buffer before the next command string is sent to the Meter.

• Rule 3: The meter executes each command completely in the order received before

moving on to the next command.

If an input string contains a trigger, enter the commands in the following order:

1. Commands to configure the Meter (if any)

2. The trigger command

3. Commands to read the result of a triggered measurement (VAL?), or to

reconfigure the instrument (if any)

4. The terminator

Note

If MEAS?, MEAS1? or MEAS2? is used, the command should follow
Configure, Trigger.

How the Meter Processes Output

The following paragraphs describe how the Meter processes output. The Meter outputs an
alphanumeric string in response to a query command from the host. (Query commands
end with “?”.) Output strings for RS-232 applications are terminated with a Carriage
Return and Line Feed (<CR><LF>).

After sending the Meter a command via the RS-232 interface, wait for the Meter to return
a prompt before sending another command. Failure to do so causes a device-dependent
command error, and the second string is discarded.

Numeric output from the Meter is shown in the following examples:

+1.2345E+0(format 1) Measured value of 1.2345

+1.2345E+6(format 1) Measured value of 1.2345M

+12.345E+6 OHM(format 2) Measured value of 12.345Mohms

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Operating the Meter Using the Computer Interface

Triggering Output 4

+/- 1.0E+9 Overload (0L on the display)

Triggering Output

The Meter takes measurements when triggered to do so. There are five trigger types,
which are described in Table 4-3. Triggers fall into two basic categories:

• Internal trigger, which triggers measurements continuously.

• External trigger, which triggers a measurement at the direction of the user.

A measurement can be externally triggered as follows:

• External trigger with rear trigger disabled. This includes trigger types 2 and 3, as

described in Table 4-3.

• External trigger with rear trigger enabled. This includes trigger types 4 and 5, as

described in Table 4-3.

• *TRG command

For use of the *TRG command, see “Common Commands.”

Table 4-3. Trigger Types

Type Trigger Rear Trigger Settling Delay

1 Internal Disabled —

2 External Disabled Off

3 External Disabled On

4 External Enabled Off

5 External Enabled On

External Triggering from the Front Panel

To enable external triggering from the front panel, perform the following procedure:

1. Press Q then J. Ext Trig and a number corresponding to the selected trigger

type (1, 2, 3, 4, or 5) are displayed. See Table 4-3 for trigger types.

2. Press U or V to step through the trigger type list. Highlight the trigger type as
follows, and then press R for two seconds to select it.

3. Select trigger type 2 to disable the settling delay; or select trigger type 3 to enable the
settling delay. See Table 4-3 for typical settling delays.

4. When trigger type 2 or 3 is selected, Ext Trig is displayed confirming that you are not
in the remote mode and an external trigger is enabled. (If you are not in the remote
mode, you will not be able to trigger measurements from the front panel.)

5. Press J to trigger a measurement. (Each time you press J you trigger a
measurement.)

6. To return the Meter to its internal (continuous) trigger state, perform step 3 and select
trigger type 1.

If you enter the remote mode with trigger type 4 or 5 selected, the Meter remains in
its external trigger state; however, because the Meter is in the remote mode, you will
only be able to trigger measurements with rear trigger types 4 and 5. To exit remote
mode, perform steps 1 and 2 and select trigger type 2 or 3 (as applicable).

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Note

In external trigger mode (mode 2 to mode 5), *TRG command is always
available.

Setting the Trigger Type Configuration

To set the trigger type configuration using the computer interface, enter the command
TRIGGER <type> (where <type> is the trigger type) and press Enter. See Table 4-3 for
trigger types.

Select trigger type 3 or 5 to enable the settling delay if the input signal is not stable before
a measurement is triggered. Typical settling delays are provided in Table 4-3. RS-232
reading transfer rates are provided in Table 4-4.

Table 4-4. RS-232 Reading Transfer Rates

Rate

Internal Trigger Operation (Trigger 1) External Trigger Operation (Trigger 4)

Slow 2.5

Medium 20

Fast 100

[1] Depends on A/D trigger speed.

[2] Depends on how fast the trigger signal is transmitted.

[1]

2.5

[1]

20

[1]

100

Readings per Second

External Trigger via the Computer Interface

To trigger a measurement using the RS-232 computer interface, enter the command
*TRG and press Enter. See the “Common Commands” section later in this chapter for use
of *TRG command.

To trigger a measurement using pin 9 of the RS-232 interface, see Figure 4-1.

+5 V Out (Pin 1)

[2]

[2]

[2]

Trig In (Pin 9)

Figure 4-1. External Trigger Using Pin 9 of RS-232 Interface

eue24.eps

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Operating the Meter Using the Computer Interface

Status Registers 4

Status Registers

The contents of the status register (STB) are determined by the service enable register
(SRE), event status register (ESR), event status enable register (ESE), and the output
buffer. These status registers are explained in the following paragraphs and summarized
in Table 4-5.

Figure 4-2 shows the relationship of these registers.

Table 4-5. Status Register Summary

Register Read Command Write Command Enable Register

Event Byte Register *STB? None SRE

Service Request Enable
Register

Event Status Register *ESR? None ESE

Event Status Enable
Register

*SRE? *SRE None

*ESE? *ESE None

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Power On

7

&

Logical OR

7

Service

Request

Generation

Command Error

User Request

6

&

&

6

Logical OR

Execution Error

Device Dependent Error

Query Error

2

345

&

&

&

2

345

RQS

6

MSS

&

Request Control

Operation Complete

1

0

&

&

1

0

MAV

ESB

&

&

Standard

Event Status Register

Read Using *ESR?

Standard

Event Status Enable

Register

Read Using *ESE?

Write to Using *ESE

2

37

1

0

&

&

&

&

Queue

Not-Empty

Output Queue

Read by Serial Poll

Status Byte Register

Read Using *STB?

Service Request

2

3457

Figure 4-2. Overview of Status Data Structures

Event Status and Event Status Enable Registers

The ESR assigns specified events to specific bits. (See Figure 4-3 and Table 4-6.) When a
bit in the ESR is set to 1, the event that corresponds to that bit occurred after the register
was last read or cleared. For example, if bit 3 (DDE) is set to 1, a device-dependent error
has occurred.

The ESE is a mask register that allows the host to enable or disable (mask) each bit in the
ESR. When a bit in the ESE is set to 1, the corresponding bit in the ESR is enabled.

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1

0

Enable Register

Read Using *SRE?

Write to Using *SRE

aam21f.eps

Operating the Meter Using the Computer Interface

When any enabled bit in the ESR changes from 0 to 1, the ESB bit in the STB also
changes to 1. When the ESR is read using the *ESR? command or cleared using the
*CLS command, the ESB bit in the STB returns to 0.

Status Registers 4

Power On

6

7

&

&

Logical OR

6

7

Summary Message

Event Summary Bit (ESB)

(Bit 5 of Status Byte Register)

Command Error

User Request

&

&

Execution Error

Query Error

Device Dependent Error

2

345

&

&

2

345

Request Control

Operation Complete

1

0

&

&

1

0

Standard

Event Status Register

*ESR?

Standard

Event Status Enable

Register

*ESE *ESE?

Figure 4-3. Event Status and Event Status Enable Registers

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Table 4-6. Description of Bits in ESR and ESE

Bit No. Name Condition

0 Operation Complete (OPC) All commands before receipt of an *OPC command have

been executed. Interface is ready to accept another
message.

1 Not used Always set to 0.

2 Query Error (QYE) Attempted to read data from the Meter's output buffer when

no output was present or pending.

Or received a new command line before a previous query
was read.

Or input and output buffers were full.

3 Device-Dependent Error (DDE) Incorrect input during calibration.

Or RS-232 input buffer overflow.

4 Execution Error (EXE) Command was understood but could not be executed. This

can result from a command that contained an inappropriate
parameter.

5 Command Error (CME) Command was not executed because it was not

understood. This can result from a command that contained
a syntax error.

6 Not used Always set to 0.

7 Power On Power was cycled off and on since the last time the ESR

was read or cleared.

Status Byte Register

The STB is a binary-encoded register that contains eight bits. Note that the SRE uses bits
1 through 5 and 7 to set bit 6, the Master Summary Status (MSS) bit, as enabled by the
SRE. The eight STB bits are described in Table 4-7, and are read using the *STB?
command.

Table 4-7. Description of Bits in the Status Byte Register (STB)

Bit No. Name Condition

0 Not used Always set to 0.

1 Not used Always set to 0.

2 Not used Always set to 0.

3 Not used Always set to 0.

4 Message Available (MAV) Data is available in output buffer. Bit set to 1 when

response to query placed in output buffer. Bit cleared (set to

0) when output terminator sent to host.

5 Event Status (ESB) One or more of enabled events in the Event Status Register

have occurred. To determine which events have occurred,
send command *ERR? to read the Event Status Register.

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Operating the Meter Using the Computer Interface

Table 4-7. Description of Bits in the Status Byte Register (STB) (cont.)

Bit No. Name Condition

6 Master Summary Status (MSS)

7 Not used Always set to 0.

[1] As read by *STB? Command. If the STB is read by a serial poll, bit 6 is returned as RQS.

[1]

Set to 1 if any enabled bit in the STB (MSS) register is set
to 1; otherwise set to 0. To determine the status of MSS
bit, send STB? query command.

Request Service (RQS) is set to 1 if service requested
from front panel or MSS is set to 1. Status of bit is
returned by serial poll, which clears RQS.

Computer Interface Command Set 4

Reading the Status Byte Register

The host reads the STB by taking a serial poll or sending the Meter a *STB? query. (The
value of the status byte is not affected by the STB? query.) When the STB is read, an
integer is returned. This integer is the decimal equivalent of an 8-bit binary number. For
example, 48 is the decimal equivalent of the binary 00110000, which means that bit 4
(MAV) and bit 5 (ESB) are set to 1.

If the status byte is read with an *STB? query, bit 6 is returned as Master Summary
Status (MSS).

See the following example:

*STB? reads the STB. If 32 is returned, it is converted to its binary equivalent of
00100000, which indicates that bit 5 (ESB) is set to 1. To determine the event status,
you would read the ESB in the same manner, using the *ESR? command.

Computer Interface Command Set

The remainder of this chapter describes the RS-232 computer interface commands.
Commands are grouped by related function and are listed in the tables that follow.
Parameters that must be supplied by the user or strings returned by the Meter are
enclosed in angle brackets (for example, <value>).

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Common Commands

Table 4-8 describes common commands.

Table 4-8. Common Commands

Command Name Description

*CLS Clear Status Clears all event registers summarized in the status

byte (except Message Available, which is cleared
only if *CLS is the first message in the command
line).

*ESE <value> Event Status Enable Sets Event Status Enable Register to <value>, where

<value> is an integer between 0 and 255.

<value> is an integer whose binary equivalent
corresponds to the state (1 or 0) of bits in the register.
If <value> is not between 0 and 255, an Execution
Error is generated.

EXAMPLE: Decimal 16 converts to binary 00010000,
which sets bit 4 (EXE) in ESE to 1.

*ESE? Event Status Enable Query Meter returns the <value> of the Event Status Enable

Register as set by the *ESE command.

<value> is an integer whose binary equivalent
corresponds to the state (1 or 0) of bits in the register.

*ESR? Event Status Register Query Meter returns the <value> of the Event Status

Register and then clears it.

<value> is an integer whose binary equivalent
corresponds to the state (1 or 0) of bits in the register.

*IDN? Identification Query Meter returns the identification code of the Meter as

four fields separated by commas. These fields are:
Manufacturer (FLUKE); model (8808A); seven-digit
serial number; and versions of main software and
display software.

*OPC Operation Complete

Command

*OPC? Operation Complete Query Meter places an ASCII 1 in the output queue when

*RST Reset Meter performs power-up reset.

Meter sets the Operation Complete bit in the
Standard Event Status Register when parsed.

parsed.

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Table 4-8. Common Commands (cont.)

Command Name Description

*SRE Service Request Enable Sets the Service Request Enable Register to

<value>, where <value> is an integer between 0 and

255. The value of bit 6 is ignored because the Service
Request Enable Register does not use it.

<value> is an integer whose binary equivalent
corresponds to the state (1 or 0) of bits in the register.
If <value> is not between 0 and 255, an Execution
Error is generated.

Computer Interface Command Set 4

*SRE? Service Request Enable

Query

*STB? Read Status Byte Meter returns the <value> of the Status Byte with bit 6

*TRG Trigger Causes the Meter to trigger a measurement when

*TST Self test query Always returns zero.

*WAI Wait-to-Continue Do nothing.

Meter returns the <value> of the Service Request
Enable Register (with bit 6 set to 0).

<value> is an integer whose binary equivalent
corresponds to the state (1 or 0) of bits in the register.

as the Master Summary bit.

<value> is an integer whose binary equivalent
corresponds to the state (1 or 0) of bits in the register.

parsed.

Function Commands and Queries

Table 4-9 describes function commands and queries. Refer to Chapter 3 for detailed
descriptions of each function.

Table 4-9. Function Commands and Queries

Commands

Primary Display Secondary Display

Function

AAC AAC2 AC current

AACDC

ADC ADC2 DC current

(Not applicable) CLR2 Clears measurement (if shown)

CONT (Not applicable) Continuity test

DIODE (Not applicable) Diode test

FREQ FREQ2 Frequency

[1]

(Not applicable) AC plus DC rms current

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Table 4-9. Function Commands and Queries (cont.)

Commands

Primary Display Secondary Display

FUNC1? (Not applicable) Meter returns function selected as command

mnemonic. For example, if frequency is selected,
FUNC1? returns FREQ.

(Not applicable) FUNC2? Meter returns function selected as command

mnemonic. For example, if frequency is selected,
FUNC2? returns FREQ

If secondary display is not in use, an Execution
Error is generated.

OHMS OHMS2 Resistance

WIRE2, WIRE4 (Not applicable) Only available in OHMS function. Used to switch

between 2-wire and 4-wire measurement.

VAC VAC2 AC volts

VACDC

VDC VDC2 DC volts

[1] When AACDC or VACDC is selected, no function can be selected for the secondary display. An

[1]

(Not applicable) AC plus dc rms volts

execution error is generated if attempted.

Function

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Operating the Meter Using the Computer Interface

Computer Interface Command Set 4

Function Modifier Commands and Queries

Table 4-10 describes function modifier commands and queries. A function modifier
causes the Meter to modify the normal operation of a measurement function or to perform
an action on a measurement before displaying a reading. For example, the relative
modifier (REL) causes the Meter to display the difference between a measured value and
the relative base. The results of function modifier commands are shown in the primary
display only.

Table 4-10. Function Modifier Commands and Queries

Command Description

DB Meter enters decibels modifier. Any reading shown in the primary display is in

decibels. An Execution Error is generated if the Meter is not in a volts ac
and/or dc function.

DBCLR Meter exits the decibels modifier and displays readings in normal units. Also

clears dB power, REL, and MIN MAX modifiers

DBPOWER Meter enters dB Power modifier if the reference impedance is set to 2, 4, 8, or

16 ohms and a voltage function has been selected. Otherwise an Execution
Error is generated. In dB Power, readings shown in the primary display are in
Watts.

DBREF <value>

DBREF? Meter returns a <value> shown in Table 4-10A. This value corresponds to the

HOLD Meter enters Touch Hold function. (See “Touch Hold Function (HOLD)” in

Set dB reference impedance to a <value> shown in Table 4-10A. This value
corresponds to the reference impedance (ohms) indicated. If <value> is not a
value in Table 4-10A, an Execution Error is generated.

Table 4-10A. Reference Impedance Values

Value Ref Impedance Value Ref Impedance

reference impedance indicated.

Chapter 3 for more information.) If HOLD is sent when the Meter is already in
Touch Hold, a reading is forced and shown on the display.

1
2
3
4
5
6
7
8

9
10
11

2
4

8
16
50
75
93

110
124
125
135

12
13
14
15
16
17
18
19
20
21

150
250
300
500
600
800

900
1000
1200
8000

HOLDCLR Meter exits Touch Hold and restores display to normal operation.

HOLDTHRESH
<threshold>

Sets HOLD measurement threshold to <threshold>.

<threshold> must be 1, 2, 3, or 4 (0.01 %, 0.1 %, 1 % or 10 %, respectively).
Any other value generates an Execution Error. See “Touch Hold Function
(HOLD)” in Chapter 3 for more information.

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Table 4-10. Function Modifier Commands and Queries (cont.)

Command Description

HOLDTHRESH? Meter returns Touch Hold <threshold> (1, 2, 3, or 4). See “Touch Hold

Function (HOLD)” in Chapter 3 for more information.

MAX Meter enters MAX modifier with present reading as maximum value. If already

in MAX modifier, Meter displays maximum value. In MAX modifier,
autoranging is disabled. See “Minimum / Maximum Modifier (MIN MAX)” in
Chapter 3 for more information.

MAXSET <numeric value> Meter enters MAX modifier with <numeric value> as the maximum value.

<numeric value> can be a signed integer, signed real number without
exponent, or signed real number with exponent. Autoranging is disabled. See
“Minimum / Maximum Modifier (MIN MAX)” in Chapter 3 for more information.

If <numeric value> exceeds the measurement range, an Execution Error is
generated.

MIN Meter enters MIN modifier with present reading as minimum value. If already

in MIN modifier, Meter displays minimum value. In MIN modifier, autoranging
is disabled. See “Minimum / Maximum Modifier (MIN MAX)” in Chapter 3 for
more information.

MINSET <numeric value> Meter enters MIN modifier with <numeric value> as the minimum value.

<numeric value> can be a signed integer, signed real number without
exponent, or signed real number with exponent. Autoranging is disabled. See
“Minimum / Maximum Modifier (MIN MAX)” in Chapter 3 for more information.

If <numeric value> exceeds the measurement range, an Execution Error is
generated.

MNMX Meter enters MIN MAX modifier with present reading as minimum and

maximum value. If already in MIN MAX modifier, Meter displays latest MIN or
MAX value. In MIN MAX modifier, autoranging is disabled. See “Minimum /
Maximum Modifier (MIN MAX)” in Chapter 3 for more information.

When the MIN MAX modifier is selected, you can toggle between displaying
the minimum and maximum readings without losing the minimum and
maximum values stored.

MNMXSET <numeric1,
numeric2>

Meter enters MIN MAX modifier with <numeric1> as the maximum value and
<numeric2> as the minimum value.

<numeric1> and <numeric2> can be signed integer, signed real number
without exponent, or signed real number with exponent. Autoranging is
disabled. See “Minimum / Maximum Modifier (MIN MAX)” in Chapter 3 for
more information.

If <numeric1> or <numeric2> exceeds the measurement range, an Execution
Error is generated.

MMCLR Meter exits the MN MX modifier. The stored minimum and maximum values

are lost, and the Meter returns to the ranging mode and range selected prior
to selecting MN MX modifier.

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Table 4-10. Function Modifier Commands and Queries (cont.)

Command Description

MOD? Meter returns a numeric value indicating modifiers in use, where 1 = MIN; 2 =

MAX; 4 = HOLD; 8 = dB; 16 = dB Power; 32 = REL; and 64 = COMP.

If multiple modifiers are selected, the value returned is equal to the sum of the
values of the selected modifiers. For example, if dB and REL are selected, 40
is returned.

REL Meter enters the relative readings modifier (REL) using the value shown on

the primary display as the relative base. Autoranging is disabled. See
“Relative Readings Modifier (REL)” in Chapter 3 for more information.

RELCLR Meter exits REL modifier and returns to the ranging mode and range selected

prior to selecting REL.

RELSET <relative base> Meter enters REL modifier using <relative base> as the offset <relative base>

value.

<relative base> can be a signed integer, signed real number without
exponent, or signed real number with exponent. Autoranging is disabled.

Computer Interface Command Set 4

If <relative base> exceeds the measurement range, an Execution Error is
generated. See “Relative Readings Modifier (REL)” in Chapter 3 for more
information.

RELSET? Meter returns <relative base>. If the relative modifier has not been selected,

an Execution Error is generated.

Range and Measurement Rate Commands and Queries

Table 4-11 describes range and measurement rate commands and queries. In autorange
mode, the Meter automatically selects a range for each reading. In manual range mode,
the user selects a fixed range.

Table 4-11. Range and Measurement Rate Commands and Queries

Command Description

AUTO Meter enters the autoranging mode on the primary display. If autorange mode

cannot be selected (if REL, MIN MAX or diode/continuity test is selected), an
Execution Error is generated.

AUTO? Meter returns 1 if it is in autorange or 0 if not in autorange.

FIXED Meter exits autoranging on the primary display and enters manual ranging.

The present range becomes the selected range.

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Table 4-11. Range and Measurement Rate Commands and Queries (cont.)

Command Description

RANGE <value range> Sets the primary display to <value range> where <value range> is the number

in the Range Value column of Table 4-11A that corresponds with the
applicable function ranges (voltage, ohms, current, etc.).

Table 4-11A. Ranges for Each Function

Range

Value

1 200 mV 200 e 20 mA 2 kHz 200 µA

2 2 V 2 ke 200 mA 20 kHz 2000 µA

3 20 V 20 ke 2 A 200 kHz 20 mA

4 200 V 200 ke 10 A 1000 kHz 200 mA

5 1000 V dc

6 NA 20 Me NA NA 10 A

7 NA 100 Me NA NA NA

[1] 1000 V dc, 750 V ac

RANGE1? Returns the range presently selected on the primary display.

RANGE2? Returns the range presently selected on the secondary display. If the

secondary display is inactive, an Execution Error is generated.

RATE <speed> Sets the measurement rate to <speed> where <speed> is either S for slow

(2.5 readings/second), M for medium (20 readings/second), or F for fast
(100 readings/second).

S, M, and F can be entered as uppercase or lowercase. Any other entry for
<speed> generates an Execution Error.

Voltage

Range

Ohms

Range

[1]

2 Me NA NA 2 A

AC

Current

Freq.

Range

DC

Current

RATE? Returns <speed> as S for slow (2.5 readings/second), M for medium

(20 readings/second), or F for fast (100 readings/second).

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Computer Interface Command Set 4

Measurement Queries

Table 4-12 describes measurement queries, which are shown on the primary and/or
secondary displays.

Table 4-12. Measurement Queries

Command Description

MEAS1? Meter returns the value shown on the primary display after the next triggered

measurement is completed.

MEAS2? Meter returns the value shown on the secondary display after the next

triggered measurement is completed. If the secondary display is off, an
Execution Error is generated.

MEAS? If both displays are on, Meter returns the value shown on both displays after

the next triggered measurement is completed in the format selected. (See
FORMAT command in Table 4-15.) Refer to the following examples for each
format:

Example of Format 1: +1.2345E+0,+6.7890E+3<CR><LF>

Example of Format 2: +1.2345E+0 VDC, +6.7890E+3 ADC<CR><LF>

If the secondary display is not on, MEAS? is equivalent to MEAS1?

Note: If MEAS is used in external trigger (TRIGGER 2 through TRIGGER 5),
unexpected results will be obtained.

VAL1? Meter returns the value shown on the primary display. If the primary display is

blank, the next triggered measurement is returned.

VAL2? Meter returns the value shown on the secondary display. If the secondary

display is blank, the next triggered measurement is returned. If the secondary
display is off, an Execution Error is generated.

VAL? If both displays are on, Meter returns the value shown on both displays in the

format selected. (See FORMAT command in Table 4-15.) Refer to the
following examples for each format:

Example of Format 1: +1.2345E+0,+6.7890E+3<CR><LF>

Example of Format 2: +1.2345E+0 VDC, +6.7890E+3 ADC<CR><LF>

If the secondary display is not on, VAL is equivalent to VAL1. If a display is
blank, the next triggered measurement on that display (or displays) is
returned.

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Compare Commands and Queries

Table 4-13 describes the compare commands and queries. These commands cause the
Meter to determine whether a measurement is higher than, lower than, or within a
specified range. These commands correspond with C, U and V on the front
panel.

Table 4-13. Compare Commands and Queries

Command Description

COMP Meter enters compare (COMP) function. Touch Hold is automatically turned

on. (Touch Hold can be turned off with HOLDCLR command.)

COMP? Meter returns Hl if the last COMP measurement reading was above the upper

limit of the compare range; LO if it was below the lower limit of the compare
range; PASS if within compare range; or a dash (—) if a measurement has
not completed.

COMPCLR Meter exits compare function (and Touch Hold if it is selected) and restores

display to normal operation.

COMPHI <high value> Sets HI compare (COMP) value to <high value>.

<high value> can be a signed integer, signed real number without exponent,
or signed real number with exponent.

COMPLO <low value> Sets LO compare (COMP) value to <low value>.

<low value> can be a signed integer, signed real number without exponent, or
signed real number with exponent.

HOLDCLR Meter exits Touch Hold and restores display to normal operation, but does not

exit the compare function.

Trigger Configuration Commands

Table 4-14 describes the trigger configuration commands, which set and return the trigger
configuration.

Table 4-14. Trigger Configuration Commands

Command Description

TRIGGER <type> Sets the trigger configuration to <type> where <type> is the number in the

Type column of Table 4-3 that corresponds with the applicable trigger, rear
trigger and setting delay. If the <type> entered is not between 1 and 5, an
Execution Error is generated.

Select a trigger type with settling delay enabled (trigger type 3 or 5) when the
input signal is not stable before a measurement is triggered. Typical settling
delays are provided in Table 4-3.

TRIGGER? Returns the trigger type set by the TRIGGER command.

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Computer Interface Command Set 4

Miscellaneous Commands and Queries

Table 4-15 describes miscellaneous commands and queries.

Table 4-15. Miscellaneous Commands and Queries

Command Description

^C (CONTRL C) Causes =><CR><LF> to be output.

FORMAT <format> Set output <format> to 1 or 2.

Format 1 outputs measurement values without measurement units (VDC,
ADC, OHMS, etc.).

Format 2 allows measurement units to be output with measurement units.
(See Table 4-16.) Format 2 primarily is used with RS-232 print-only mode.

FORMAT? Returns the format in use (1 or 2).

PRINT <rate> Sets print rate for print mode. See Table 4-2.

SERIAL? Returns Meter’s serial number.

Table 4-16. Measurement Units Output with Format 2

Measurement Function Units Output

Volts dc VDC

Volts ac VAC

Amps dc ADC

Amps ac AAC

Resistance OHMS

Frequency HZ

DIODE VDC

Continuity Test OHMS

RS-232 Remote / Local Configurations

Table 4-17 describes the RS-232 remote and local configuration commands, which are
used with the RS-232 interface to set up the remote/local configuration of the Meter.
These commands are valid only when the RS-232 interface is enabled.

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Table 4-17. Remote/Local Configuration Commands

Command Description

REMS Puts the Meter into remote (REMS) state mode without front panel lockout.

r is shown on the display.

RWLS Puts the Meter in remote with lockout state (RWLS) with front panel lockout.

r and L are shown on the display. When in RWLS, all front panel
buttons are disabled.

LOCS Puts the Meter is local state (LOCS) mode without lockout. All front panel

buttons are enabled.

LWLS Puts the Meter in local with lockout state (LWLS) mode. All front panel buttons

are disabled. L is shown on the display.

RS-232 Save / Recall System Configurations

Table 4-18 describes RS-232 save/recall system configuration commands, which are used
with the RS-232 interface to set up the remote/local configuration of the Meter.

Table 4-18. Save / Call System Configuration Commands

Command Description

Save <position> Saves the current running working status into <position>, where <position> is

1 through 6.

Call <position> Recalls the working status from <position>, where <position> is 1 through 6.

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Operating the Meter Using the Computer Interface

Sample Program Using the RS-232 Computer Interface 4

Sample Program Using the RS-232 Computer Interface

Figure 4-4 is an annotated BASIC A program written for a PC that demonstrates how the
Meter can be used with the RS-232 computer interface.

Figure 4-4. Sample Program for RS-232 Computer Interface

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aam23f.eps

Appendices

Appendix Title Page

A Applications ........................................................................................................ A-1

B 2X4 Test Leads ................................................................................................... B-1

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Appendix A

Applications

Introduction

This chapter discusses some applications that will help you use the Meter effectively.
These applications assume you are familiar with the basic operation of the Meter and
have a basic understanding of electronics. A sophisticated understanding of electrical
circuits is not necessary.

Using the Dual Display

Using the dual display effectively and with ingenuity can greatly enhance your test and
measurement capabilities. The dual display allows you to make two measurements on a
common input signal, which in the past would have required that you use two meters or
to make a series of measurements.

To see how easy it is to use the dual display to take two readings on one signal, perform
the following example procedure to measure the voltage and frequency of line power.

1. Press on the Meter.

2. Plug the test leads into the INPUT VZYR HI and LO terminals.

3. Press A to select volts ac for the primary display.

4. Press Q then F to select frequency for the secondary display.

5. Insert the test lead probes into a wall socket. The display will appear similar to

Figure A-1. The actual display depends on the local power supply.

A-1

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Using Measurement Functions in Combination

eue25.eps

Figure A-1. Example of Dual Display Showing Volts AC and Frequency

The dual display allows you to display select combinations of measurements for the input
signal being measured. Allowable combinations of properties are shown in Table A-1.

Volts (dc + ac) rms or current (dc + ac) rms measurements can only be made in the
primary display. While (dc + ac) measurements are being made, another function cannot
be selected for the secondary display.

Additional combinations of dual readings can be added by using the relative readings,
minimum/maximum, and/or Touch Hold function modifiers.

Table A-1. Allowable Combinations of Measurements

Primary Function

DC V AC V DC I

DC V X X X X

AC V X X X X X

DC I X X X X

AC I X X X X

FREQ X X

Secondary Function

OHMS X

[1]

AC I FREQ OHMS

How the Meter Takes Dual Display Measurements

When the Meter is in the dual display mode (both the primary and secondary displays are
on), the Meter takes measurements and updates the displays in one of two ways: (1) It
takes a single measurement and updates both displays using that measurement; or (2) it
updates each display using a separate measurement.

Updating Primary and Secondary Displays with a Single Measurement

The Meter takes a measurement and updates both displays using that measurement only
when the measurement function is the same for both the primary and secondary displays.

This will happen, for instance, if Touch Hold (with autoranging on) is applied to a
measurement function on the primary display and the same function is selected for the
secondary display.

A-2

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Applications A

If the relative readings value of a dc voltage measurement is shown in the primary
display and the dc voltage itself is shown in the secondary display, the Meter takes a
single measurement and updates both displays with it.

Updating Primary and Secondary Displays with Separate Measurements

If the measurement function in the primary display is different from that in the secondary
display, the Meter updates each display using a separate measurement.

Taking Voltage and Current Measurements Using the Dual Display

Most applications of the dual display listed in Table A-2 can be performed using a single
set of test leads connected to the INPUT VZYR HI and LO terminals. However, to
measure the voltage and current of an input signal requires three leads. Be sure that the
voltage and current measurements share the same common as shown in Figure A-2. Then
simply follow the precautions you would follow if you were making normal current
measurements without a current clamp.

Table A-2. Sample Dual Display Applications

Primary

Display

Volts DC Volts AC • Monitor dc level and ac ripple of power supply Troubleshoot

Volts DC Current DC • Check power supply load regulation

Volts DC Current AC • Line and load regulation tests

Volts AC Current DC • Line and load regulation tests

Volts AC Current AC • Line and load regulation tests

Volts AC Frequency • Measure ac amplitude and frequency for line voltage and ac signal

Current DC Current AC • Measure ripple and dc current draw of switching power supply

Secondary

Display

Applications

amplifier circuits

• Monitor UUT current draw and circuit voltages

• Monitor loop current and voltage drop across transmitter

• dc/ac or ac/dc converters

• dc/ac or ac/dc converters

• Transformer (magnetic circuit) saturation

analysis

• Measure frequency response of an amplifier

• Adjust ac motor control

• Read noise in telecommunication applications

• Adjust portable power generator to optimize power output

• Set frequency compensation for a network

• Measure current dissipation in protective fuse resistors used in

power supplies

• Measure ripple and noise on a line

MN MX Actual Value • Show the minimum or maximum value recorded and the present

measurement

REL Actual Value • Show actual measurement and the difference between this value

and the relative base.

A-3

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8808A

Users Manual

Table A-2. Sample Dual Display Applications (cont.)

Primary

Display

Secondary

Display

Applications

REL Resistance • Select and sort resistors. (See also "Using the Compare Function"

in Chapter 3.)

HOLD Actual Value • Show actual measurement while holding a previous, stable

measurement on the primary display

5-1/2 DIGIT MULTIMETER

8808A

2W/4W

HI

1000V
750V

LO

200mA

MAX

mA

INPUT SENSE

V

1000V CAT I

MAX

600 V CAT II

1V

500 V pk

10A

MAX

4

W

HI

300V

LO

10A

eue27.eps

Figure A-2. DC Voltage and DC Current Measurement on Input Signal

The lead from the internal measuring circuitry of the meter to the LO terminal (on the
front panel) is the same for both voltage and current measurements. The resistance of this
lead is approximately .003 ohm. If current is being measured, therefore, a voltage drop
will occur in the resistance that is common to both circuits. This internal resistance, when
added to the external resistance of the lead from the COM input terminal will affect the
accuracy of the voltage reading. For instance, if the external lead resistance is .007 ohm,
the "total" common resistance is .010 ohm. If there is 1 A of current, the voltage reading
would be affected by:

(1 A x.01ohm ) = .01 V or 10 m V.

Depending on the circumstances, this may be significant.

If you want to measure dc voltage on an input signal in the primary display and dc
current in the secondary display, proceed as follows:

1. Turn the Meter on.

2. Press D to select the dc voltage function for the primary display.

3. Press Q then E to select the dc current function for the secondary display.

4. Connect the leads to the test circuit as shown in Figure A-2 and read the

measurements on the display. Although current will be displayed as negative, it is in
fact positive when interpreted according to current flow convention.

Response Times

Response time is the time between a change in an input and when that change is
displayed. The meter’s response time depends on many factors: the measurement

A-4

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Appendices

Applications A

function selected, number of measurements being made (single measurement when only
the primary display is used, or two measurements when both the primary and secondary
display are used), the input level, range type (autorange or manual range), the
measurement rate (slow, medium, or fast), and whether measurement types are mixed or
not. (Measurements are either ac-type [ac volts or amps] or dc-type [all others]).

Typical response times for a single measurement are shown in Table A-3. For a single
measurement, results are displayed as soon as the correct range is found. However,
additional time needs to be allowed for the measurement to be fully settled in order for
the displayed result to meet the meter’s accuracy specifications. This "settling delay"
varies, depending on the differences between the primary and secondary displays.

The settling delay is longer when ac- and dc-type measurements are mixed. Examples of
mixed ac and dc measurements are volts dc and amps ac, and volts ac and amps dc.
Settling times are listed in Table A-4.

Update Rate in the Dual Display Mode

The update rate is the time between successive measurements for a steady state signal. In
the dual display mode (when both the primary and secondary displays are on), if the
measurement functions or the ranges selected for the primary and secondary displays are
different, the update rate for each measurement function will vary from the update rate
for that measurement function when only the primary display is on.

When the secondary display is on, the meter always waits for the measurement to be fully
settled after changing the range or function before displaying a reading. The amount of
delay depends on the functions and ranges selected for the primary and secondary
displays as shown in Table A-4.

Table A-5 lists the interval between measurements when the measurement function or
range of the primary and secondary display differ. These intervals vary by measurement
function, range, measurement rate (slow, medium, or fast), and measurement type (ac-and
dc-type measurements mixed or not mixed).

A-5

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8808A

Users Manual

Table A-3. Typical Single Measurement Response Times (in Seconds)

Meas.

Slow Rate Medium Rate Fast Rate

Function

Auto

Range

[1]

Single

Range

[2]

Auto

Range

[1]

Single

Range

[2]

Auto

Range

[1]

Single

Range

[2]

D 1.2 0.4 0.7 0.1 0.5 0.05

A 1.2 0.2 0.7 0.1 0.5 0.05

E 1.4 0.4 0.8 0.1 0.6 0.05

B 1.0 0.2 0.6 0.1 0.5 0.05

O 3.2 0.4 1.8 0.2 1.1 0.10

G N/A N/A N/A N/A N/A N/A

F 1.2 0.4 0.72 0.18 0.56 0.14

[1] Time to autorange a new measurement from the lowest to the highest range and to display the result.

[2] Typical time to change to the next higher or lower range and display the result.

Table A-4. Typical Settling Delays (in Seconds)

Meas.

Function

Range

Slow Med Fast

Settling Delay

D All 0.2 0.05 0.05

A All 0.5 0.05 0.05

E All 0.2 0.3 0.0

B All 0.5 0.2 0.2

O All 0.2 0.5 0.5

G N/A N/A N/A 0.05

F N/A 0.5 0.2 0.2

A-6

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Appendices

Table A-5. Typical Measurement Intervals (in Seconds) for Dual Display Measurements

Applications A

Meas.

Function

D All 1.2 1.0 0.9

A All 1.0 0.85 0.8

E All 1.2 1.0 0.9

B All 1.0 0.85 0.8

O N/A N/A N/A N/A

G N/A N/A N/A N/A

F N/A N/A N/A N/A

Range Slow Med Fast

External Trigger

The external trigger can be used with or without settling delays, as shown in Table A-4.
(Refer to Table 4-3 for trigger types.) The amount of trigger delay varies depending on
differences between the primary and secondary displays, as described in the previous
section.

When external trigger is enabled, the meter determines the ranges for the primary and
secondary (if enabled) displays based on the input at that time. The meter is then ready to
begin measuring the input on the optimum range as soon as the trigger is received. If the
input changes so that either display autoranges after the trigger is received, the
autoranging response times (as shown in Table A-3) may be required before each
measurement result is displayed.

The rear panel trigger input is edge sensitive. A low to high pulse (above +3 V) will be
recognized as a trigger less than 3 ms.

Thermal Voltages

Thermal voltages are the thermovoltaic potentials generated at the junction between
dissimilar metals. Thermal voltages typically occur at binding posts and can be greater
than 1 μV. When making low-level dc measurements, thermal voltages can present an
additional source of error.

Thermal voltages can also cause problems in the low ohms ranges. Some low-value
resistors are constructed with dissimilar metals. Just handling such resistors can cause
thermal voltages large enough to introduce measurement errors.

Use the following techniques to reduce the effect of thermal voltages:

1. Use similar metals for connections wherever possible (e.g., copper-to-copper, gold-

to-gold, etc.).

2. Use tight connections.

3. Use clean connection (especially free of grease and dirt).

4. Use caution when handling the circuit under test.

5. Wait for the circuit to reach thermal equilibrium. (Thermal voltages are generated

only where there is a temperature gradient.)

A-7

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8808A

Users Manual

Making Low-Level Current Measurements

There are many applications where obtaining the utmost accuracy in low-level current
measurements is critical. For example, determining the leakage current of a battery
operated device in its standby mode is critical in determining the time before battery re­charge is needed. Traditional multimeters make these measurements using a shunt
method shown in Figure A-3. The shunt resistor converts the current to be measured to a
voltage, which is called the burden voltage. Since the internal impedance of the current
source is in parallel with the shunt resistor, the current flowing in the shunt resistor is less
than the actual value, thus causing an error.

I

IN

A

R

Internal

Figure A-3. Shunt Method of Low-Level Current Measurement

R

SHUNT

V

OUT

eue28.eps

Another method of low-current measurement is the feedback resistor method shown in
Figure A-4. The feedback resistor converts the current to be measured into a voltage. The
high gain operational amplifier forces the burden voltage to approximately zero and thus
reduces the error associated with the simple shunt measurement approach. The zero
burden voltage measurement method used in the Meter gives a more accurate
measurement of low-level (leakage) currents.

R

I

IN

Feedback

A

R

Internal

Figure A-4. Zero Burden Voltage Low-Level Current Measurement

V

OUT

eue29.eps

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Introduction

The optional Fluke TL2X4W test leads simplify making 4-wire ohms measurements by
integrating the Hi-Hi Sense and Lo-Lo Sense test leads into one cable. The Meter’s Input
HI and LO jacks consist of two contacts. One contact is connected to HI or LO input
circuits and the other contact is connected to the Sense input circuits. Like the input jacks,
the 2x4 test lead also has two contacts that align with the input jack contacts to provide a
four wire connection.

Appendix B

2X4 Test Leads

Ground tab

Figure B-1. 2X4 Wire Test Leads

caw061.eps

XW Warning

To avoid electric shock and possible damage to the Meter, use
the 2X4 Wire test leads as specified in this manual. Inspect the
test leads before use. Do not use them if insulation is damaged
or metal is exposed. Check the test leads for continuity.
Replace damaged test leads before using the Meter.

B-1

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