Fluke 183, 185 User Manual

183 & 185

True RMS Multimeters

®

Users Manual

February 2001 Rev.2, 4/02

© 2001-2002 Fluke Corporation. All rights reserved. Printed in USA
All product names are trademarks of their respective companies.

LIFETIME LIMITED WARRANTY

Each Fluke 20, 70, 80, 170 and 180 Series DMM will be free from defects in

material and workmanship for its lifetime. As used herein, “lifetime” is defined
as seven years after Fluke discontinues manufacturing the product, but the
warranty period shall be at least ten years from the date of purchase. This war­ranty does not cover fuses, disposable batteries, damage from neglect, misuse,
contamination, alteration, accident or abnormal conditions of operation or han­dling, including failures caused by use outside of the product’s specifications, or
normal wear and tear of mechanical components. This warranty covers the
original purchaser only and is not transferable.

For ten years from the date of purchase, this warranty also covers the LCD.
Thereafter, for the lifetime of the DMM, Fluke will replace the LCD for a fee
based on then current component acquisition costs.

To establish original ownership and prove date of purchase, please complete
and return the registration card accompanying the product, or register your
product on http://www.fluke.com. Fluke will, at its option, repair at no charge,
replace or refund the purchase price of a defective product purchased through
a Fluke authorized sales outlet and at the applicable international price. Fluke
reserves the right to charge for importation costs of repair/replacement parts if
the product purchased in one country is sent for repair elsewhere.

If the product is defective, 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. Fluke will pay return
transportation for product repaired or replaced in-warranty. Before making any
non-warranty repair, Fluke will estimate cost and obtain authorization, then in­voice you for repair and return transportation.

THIS WARRANTY IS YOUR ONLY REMEDY. NO OTHER WARRANTIES,
SUCH AS FITNESS FOR A PARTICULAR PURPOSE, ARE EXPRESSED OR
IMPLIED. 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. AUTHORIZED
RESELLERS ARE NOT AUTHORIZED TO EXTEND ANY DIFFERENT WAR­RANTY ON FLUKE’S BEHALF. Since some states do not allow the exclusion
or limitation of an implied warranty or of incidental or consequential damages,
this limitation of liability may not apply to you. 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.

Fluke Corporation Fluke Europe B.V.
P.O. Box 9090 P.O. Box 1186
Everett, WA 98206-9090 5602 BD Eindhoven
U.S.A. The Netherlands

2/02

Table of Contents

Title Page

Introduction.......................................................................................... 1

Contacting Fluke.................................................................................. 1

Safety Information................................................................................ 2

Safety Terms..................................................................................... 2

Symbols ............................................................................................ 2

Safety Precautions............................................................................ 3

Front and Rear Panel Overview............................................................ 6

Measurement Function Knob ........................................................... 9

Input Connectors.............................................................................. 10

Operating Basics................................................................................... 11

Safe Test Lead Connections............................................................. 11

Using Procedures in this Section...................................................... 12

Voltage Measurements..................................................................... 13

Application: Using AC DC and AC+DC in Volts Mode.............. 14

dB and dBm Voltage Measurements................................................ 15

Application: Using a Reference Value Other than Default

1.000 V RMS in dB Mode............................................................ 15

Application: Using Voltage in a Circuit as the Reference

Value in dB Mode ........................................................................ 15

Frequency Measurements................................................................. 16

Negative Edge Triggering............................................................. 16

Positive and Negative Duty Factor............................................... 16

AC vs. DC Coupled Frequency Measurements ............................ 17

Changing Voltage Range in Frequency Mode.............................. 17

Resistance Measurements (Ohms, Continuit y, Dio de,

and 50 Ω Range)............................................................................... 18

Application: Measuring Low Resistance Values.......................... 19

Capacitance Measurement................................................................ 19

Temperature Measurements (185 only)............................................ 20

Helpful Tip: Increased Temperature Accuracy............................. 20

Current Measurements...................................................................... 21

Button and Softkey Overview .............................................................. 22

Yellow (Shift) Button....................................................................... 22

RANGE Button ................................................................................ 22

MIN MAX (Minimum, Maximum) Button...................................... 23

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Users Manual

FAST MIN MAX (1 ms Peak)......................................................... 23

Backlight Button (s)...................................................................... 23

HOLD Button................................................................................... 23

Auto Hold ........................................................................................ 24

REL t Button (Making Relative (REL t) Measurements)........... 24

MEMORY ....................................................................................... 25

Softkeys (1 2 3 4)................................................. 26

Setup Menu...................................................................................... 26

Special Features................................................................................... 27

High Resolution (HrES) 50,000-Count Mode.................................. 27

Beeper.............................................................................................. 28

Auto-Off........................................................................................... 28

Power-Up Options............................................................................ 28

MIN MAX AVG Operation............................................................. 31

Auto Fuse Detection......................................................................... 32

Specifications....................................................................................... 33

Accessories .......................................................................................... 46

Setup for Optional Computer Interface Accessory (FlukeView Forms) 47

Using Protective Holster and Tilt-Stand .............................................. 48

Battery Replacement............................................................................ 48

Servicing the Meters............................................................................ 49

Replacing the Fuse........................................................................... 50

General Care and Cleaning .................................................................. 51

t Relative to a Measured Value ................................................. 24

t Relative to a Saved Value ....................................................... 24

t Relative to a Programmed Value............................................. 25

STO.............................................................................................. 25

RCL.............................................................................................. 25

CLR.............................................................................................. 26

EXIT ............................................................................................ 26

ii

List of Tables

Table Title Page

1. Symbols............................................................................................. 2

2. Setup Prompts, Definitions, and Default Values................................ 27

3. Power-up Options.............................................................................. 29

4. MIN MAX Operations....................................................................... 31

5. DC Voltage Characteristics................................................................ 34

6. DC Voltage Range, Resolution, and Accuracy.................................. 34

7. AC Voltage Characteristics................................................................ 35

8. AC Voltage Range, Resolution, and Accuracy.................................. 36

9. DC Current Characteristics................................................................ 36

10. DC Current Range, Resolution, and Accuracy................................... 37

11. AC Current Characteristics................................................................ 37

12. AC Current Range, Resolution, and Accuracy................................... 38

13. Resistance (Ω) Characteristics........................................................... 38

14. Resistance Range, Resolution, and Accuracy.................................... 39

15. Continuity Characteristics.................................................................. 39

16. Diode Test Characteristics................................................................. 40

17. Capacitance Range, Resolution, and Accuracy (5,000 counts only).. 40

18. Frequency Characteristics, Resolution, and Accuracy....................... 41

19. Frequency Voltage Range.................................................................. 41

20. Duty Factor Characteristics................................................................ 41

21. Temperature Characteristics .............................................................. 42

22. FAST MIN MAX (1 ms) Characteristics........................................... 42

23. Physical Characteristics..................................................................... 42

24. Environmental Characteristics........................................................... 43

25. Certifications and Compliances......................................................... 44

26. Standard Accessories......................................................................... 46

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Users Manual

iv

List of Figures

Figure Title Page

1. Front Panel (185 is shown)................................................................ 6

2. Rear Panel View (185 is shown) ........................................................ 7

3. Display Indicators.............................................................................. 8

4. Measurement Function Knob............................................................. 9

5. Input Connectors................................................................................ 10

6. Meter Softkeys................................................................................... 12

7. Positive and Negative Duty Factor .................................................... 17

8. Setup for the Optional Computer Interface Accessory....................... 47

9. Holster and Tilt Stand........................................................................ 48

10. Replacing the Batteries...................................................................... 49

11. Opening the Case............................................................................... 50

12. Fuse Access ....................................................................................... 51

v

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Users Manual

vi

Fluke 183 &185

True RMS Digital Multimeters

Introduction

The Fluke 183 and 185 True RMS Digital Multimeters (hereafter referred to as
"the meter") are handheld, battery-o perated instruments that measure and
source electrical and physical parameters. These Meters comply with IEC 1010

nd

2

edition for CAT III 1000 V and CAT IV 600 V environments.

WWarning

To avoid injury and ensure safe operation of the meter,
follow all safety precautions detailed in this manual.

Contacting Fluke

To order accessories, receive operating assistance, or get the location of the
nearest Fluke distributor or Service Center, call:

USA: 1-888-99-FLUKE (1-888-993-5853)
Canada: 1-800-36-FLUKE (1-800-363-5853)
Europe: [phone]
Japan: [phone]
Singapore: [phone]
Anywhere in the world: [phone]

Or, visit Fluke’s Web site at

www.fluke.com.

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183 & 185

Users Manual

Safety Information

Review the following safety precautions to avoid injury and prevent damage to
the meter or any products connected to it. To avoid potential hazards, use the
meter only as specified

Safety Terms

The following terms appear in this manual:

WWarning- Warning statements identi fy co nditions or practices that co uld

result in injury or loss o f life.

Caution-

in damage to the meter or other property

Caution statements identify conditions or practices that could result

.

Symbols

Refer to Table 1 for a listing of symbols that may appear on the meter or in this
manual.

Table 1. Symbols

Y

W

T

M

P

Risk of electric shock
See manual
Equipment protected by double or reinforced Insulation
Battery
Conforms to CSA C22.2 No 1010. 2.032-96

Conforms to EU directives

J

D

;

N10140

VDE Conforms to VDE EN61010

2

Earth
AC or DC
Conforms to relevant Australian standards

Inspected and licensed by TÜV Product Services

True RMS Digital Multimeters

Safety Precautions

WWarning

Only qualified personnel should perform service
procedures.

To avoid fire or personal injury:

Connect and disconnect properly. Do not connect or

•

disconnect probes or test leads while they are
connected to a voltage source.

Observe all ratings and markings on the meter. Consult

•

the meter manual for further ratings information before
making connections to the meter.

Do not apply a potential to any terminal, including the

•

common terminal, that exceeds the maximum rating of
that terminal.

Safety Information

If this product is used in a manner not specified by the

•

manufacturer, the protection provided by the
equipment may be impaired.

Replace batteries only with the proper type and rating

•

specified.
Do not operate the meter with covers or panels

•

removed.
Use only the fuse type and rating specified for this

•

meter.
Avoid exposed circuitry. Do not touch exposed

•

connections and components when power is present.
If you suspect there is damage to the meter, have it

•

inspected by qualified service personnel.
Do not operate in wet/damp conditions. Do not operate

•

in an explosive atmosphere. Keep meter surfaces clean
and dry.

This meter is sensitive to strong external magnetic

•

fields.
Do not use the meter within 1-inch (2.54 cm) of strong

external magnetic fields such as that produced by the
Fluke ToolPak hanging magnet accessory. Incorrect
readings may result. If erratic behavior is noted, turn
meter off to reset.

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Users Manual

WWarning

To avoid possible electric shock or personal injury, follow
these guidelines:

Before and after measuring hazardous voltages (≥ 30 V

•

ac rms, 42 V peak, or 60 V dc), verify the meter’s proper
operation by measuring a known voltage.

Do not use the meter if it is damaged. Before you use

•

the meter, inspect the case. Look for cracks or missing
plastic. Pay particular attention to the insulation
surrounding the connectors.

Inspect the test leads for damaged insulation or

•

exposed metal. Check the test leads for continuity.
Replace damaged test leads before you use the meter.

If this product is used in a manner not specified by the

•

manufacturer, the protection provided by the
equipment may be impaired.

Do not use the meter if it operates abnormally.

•

Protection may be impaired. When in doubt, have the
meter serviced.

Do not operate the meter around explosive gas, vapor,

•

or dust.
Do not apply more than the rated voltage, as marked

•

on the meter, between terminals or between any
terminal and earth ground.

Before use, verify the meter’s operation by measuring

•

a known voltage.
When measuring current, turn off circuit power before

•

connecting the meter in the circuit. Remember to place
the meter in series with the circuit.

When servicing the meter, use only specified

•

replacement parts.
Use caution when working above 30 V ac rms, 42 V

•

peak, or 60 V dc. Such voltages pose a shock hazard.

• Avoid working alone.

• When using the probes, keep your fingers behind the

finger guards on the probes.

4

True RMS Digital Multimeters

Safety Information

Connect the common test lead before you connect the

•

live test lead. When you disconnect test leads,
disconnect the live test lead first.

Remove test leads from the meter before you open the

•

battery door.
Do not operate the meter with the battery door or

•

portions of the cover removed or loosened.
To avoid false readings, which could lead to possible

•

electric shock or personal injury, replace the batteries
as soon as the low battery indicator (M) appears.

Use only type AA batteries, properly installed in the

•

meter case, to power the meter.
To avoid the potential for fire or electrical shock, do

•

not connect the thermocouples to electrically live
circuits.

Caution

To avoid possible damage to the meter or to the
equipment under test, follow these guidelines:

Disconnect circuit power and discharge all high-

•

voltage capacitors before testing resistance,
continuity, diodes, or capacitance.

Use the proper terminals, function, and range for your

•

measurements.
Before measuring current, check the meter’s fuses and

•

turn power OFF to the circuit before connecting the
meter to the circuit.

5

183 & 185

Users Manual

Front and Rear Panel Overview

TRUE RMS MULTIMETER

185

1

2

F

2

F

3

F

CAT
1000V

4

6
7

HOLD

A

REL

8
9

MEMORYFAST MIN MAX

10

Hz

F

1

3
4
5

RANGE

MIN MAX

Hz

V

OFF

COM VA

10A MAX

FUSED

A Extra large LCD display with dual numerical readout.
B Measurement function knob – Use to select a measurement.

C

Yellow (shift) button– Use to access FAST MIN MAX, MEM, and Setup
menu.

D RANGE button – Use to set measurement range.

ahr01f.eps

E MIN MAX button – Use to set meter to MIN MAX or Fast (1ms) modes.

F 1234

select measurements.

G s

– Use to turn backlight on and off.

H HOLD button – Use to freeze display or select Auto Hold.
I REL t button – Use to make relative measurements and access the

memory.

J Input connectors.

Figure 1. Front Panel (185 is shown)

6

Softkeys – Use with measurement function knob to

True RMS Digital Multimeters

Front and Rear Panel Overview

1

2

3

4

5

ahr02f.eps

A

Press and hold options – Activate by holding down the specified button
for two seconds while the meter is on.

B Power-up options – Activate by holding down the specified button while

turning on the meter.

C Compliance and battery and fuse replacement information.
D Serial number and barcode tag.
E Removable battery cover.

Figure 2. Rear Panel View (185 is shown)

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183 & 185

Users Manual

6

1
2

3
4

5

A Special feature indicators
B Low battery indicator
C RELt indicator

7

8

9

10

11

ahr03f.eps

D Yellow (shift) button and memory mode indicators
E Bargraph
F Upper display
G Upper display units
H Main display
I Main display units
J Range indicators
K Softkey menus

Figure 3. Display Indicators

8

Measurement Function Knob

True RMS Digital Multimeters

Front and Rear Panel Overview

Hz

V

OFF

A

Hz

V

OFF

A

183 185

ahr04f.eps

OFF -Turns off the meter. Setup parameters and stored measurements are
saved.

V- Volts AC RMS, Volts DC, Volts AC DC dual display, Volts AC+DC total

RMS, dB, and dBm.

Hz - Frequency measurements. Duty factor also shows if it is turned on in the

Setup menu.

Re/G -Access to resistance and continuity measurements and diode

test.

E- Capacitance measurements.

T - Temperature measurements in degrees Celsius or Fahrenheit.

A - Amps AC RMS, Amps DC, Amps AC + DC total RMS, Amps AC DC dual
display, and Amps DC 4-20 mA% (process control loop measurement).

Figure 4. Measurement Function Knob

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183 & 185

Users Manual

Input Connectors

COM VA

Hz

10A MAX

FUSED

CAT
1000V

ahr05f.eps

A - Input connector for current measurements up to 10 A (15 A for 30

seconds).

COM - Common connector. All measurements are referenced to this

connector.

V - Input connector for volts, frequency, ohms, continuity, diode, capacitance,

and temperature measurements.

Figure 5. Input Connectors

To avoid personal injury, do not attach meter leads
the battery cover removed.

To avoid damaging the meter, do not attempt to measure
current with the batteries removed.

10

WWarning

Caution

with

True RMS Digital Multimeters

Operating Basics

Operating Basics

Before you take any of the measurement s d e scribed in this section, follow
these steps:

• For specified accuracy, allow the meter to stabilize for 30 seconds after

you turn on the meter.

• Observe the safe test lead connections below when you remove the test

leads from the meter.

• Always disconnect power to the circuit when you measure resistors,

capacitors, diodes, or continuity within the circuit.

• Discharge capacitors before taking capacitance measurements.

Safe Test Lead Connections

To safely disconnect the test leads from the meter, first disconnect all test leads
from the circuit being tested, then disconnect the leads from the input
connectors.

WWarning

To prevent electrical shock, do not insert unnecessary test
leads or metal pins into the A (amps) connector. Voltages
applied to any connector may be present at all other input
connectors. Only use the test leads supplied or
recommended (or their equivalent) with the meter. Refer to
the "Accessories" section.

11

183 & 185

Users Manual

Using Procedures in this Section

All measurements are made by first setting the measurement function knob to
a function setting and then selecting a measurement from the softkeys. Note
that not all knob settings have corresponding softkey setting s.

For example, the steps below explain how to make a DC voltage measurement:

1. Set the measurement functio n knob to V for a voltage measurement.

2. Select softkey

2

for DC voltage.

3. Connect the leads to the measurement points.

F

F

1

2

Figure 6. Meter Softkeys

F

3

F

4

ahr07f.eps

12

Voltage Measurements

True RMS Digital Multimeters

Operating Basics

Measurement Softkey Connect Leads

True RMS

1 AC AC Hz
AC voltage
(default)

DC voltage 2 DC

AC DC dual
display

3

AC DC

or

AC+DC total

1

RMS

AC+DC

(press to

toggle)

ahr08f.eps

ahr08f.eps

Main

Display

Display

DC ––

DC AC

AC+DC Hz

Upper

1

VRMS =

VDCVAC +

22

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183 & 185

Users Manual

Application: Using AC DC and AC+DC in Volts Mode

DC = 5 V
AC = 1V RMS
Frequency = 60 Hz

ahr09f.eps

AC voltages riding on power supplies can cause problems with electronic
circuits. If you set the meter to DC Volts mode, the display shows the DC
component of 5.000 V. However, the AC component may be missed. It is
recommended that you set the meter to AC DC dual display mode. The main
display shows the 5.000 V DC voltage and the upper display shows the 1.000
V AC voltage. AC DC mod e also allo ws you to simu ltaneously make AC and
DC measurements without changing the meter settings.

Another useful measurement is AC+DC total RMS. To take this measurement,
press softkey

3

to toggle to AC+DC. In the above exa mple, the total RMS
of 5.099 V shows on the main display and the frequency of 60.00 Hz shows on
the upper display. When calculating the power dissipated in a circuit
component, it is critical that the DC value is factored into the equation
VRMS X IRMS, where VRMS is AC+DC total RMS.

14

True RMS Digital Multimeters

dB and dBm Voltage Measurements

Operating Basics

Main

Measurement Softkey Connect Leads

dB (185 only)
dBm (185

2

only)

1

dB readout = 20 X log (main display readout/ref), where ref = 1 V is the

default.

2

dBm readout = 10 X log (main display readout2/R), where R=600

1

4

or dBm
(press to
toggle)

dB

ahr08f.eps

Display

AC dB
AC dBm

e

.

Upper

Display

Application: Using a Reference Value Other than Default

1.000 V RMS in dB Mode

To manually change the reference voltage in dB mode, press and hold the
yellow (shift) button to display the Setup menu. Adjust the
the value you want and press softkey

4

for OK. Subseq uent dB

rEF (dB)

measurements will use this stor ed value as the reference voltage until you turn
off the meter.

value to

Application: Using Voltage in a Circuit as the Referen ce
Value in dB Mode

An example of using a voltage in a circuit as the reference value is measuring
the AC voltage gain of an amplifier. Set the meter to dB mode and measure the
voltage that you want to use for the r eference (the input of the amplifier). Pr ess

t

REL

output of the amplifier. The voltage gain of the amplifier (in dB) shows in the
upper display.

In both of these applications, the t indicator shows in the upper display to
indicate the reference is a voltage other than the default value of 1.000 VRMS.
The reference value returns to 1.000 V when you exit dB mode.

to save the measured value as the reference value. Next, measure the

15

183 & 185

Users Manual

Frequency Measurements

Main

Measurement Softkey Connect Leads

Frequency Hz – EdGE

(no

Display

Upper

Display

selection)

Frequency

Hz % Duty
and duty factor
dual display

ahr08f.eps

1

Displayed when you set negative edge triggeri ng in th e Setup menu. –

but not displayed when % duty is on.

2

You must turn on positive or negative duty in Setup menu.

EdGE

is active

Negative Edge Triggering

To trigger on the negative edge of the waveform, set
Setup menu. The word

-EdGE

shows in the upp e r display when you exit the

Setup menu.

EdGE

to

nEG

in the

1

2

Positive and Negative Duty Factor

To measure duty factor, set duty (

nEG

. When you measure negative duty factor, a “–” symbol shows in the

upper display.

POL

in the Setup menu) to either

POS

or

16

True RMS Digital Multimeters

Operating Basics

b

a

Figure 7. Positive and Negative Duty Factor

ahr10f.eps

Positive duty factor: % duty = (a/b) x 100

Negative duty factor: % duty = (1–a/b) x 100

AC vs. DC Coupled Frequency Measurements

When the duty factor measurement mode is off, the frequency measurement is
AC coupled; otherwise, it is DC co upled.

Changing Voltage Range in Frequency Mode

To change voltage range , press RANGE. The voltage range shows momen tarily
in the upper display. Continue pressi ng
voltage ranges until t he range you want shows. The default voltage range is
5 V.

RANGE to cycle through the available

17

183 & 185

Users Manual

Resistance Measurements (Ohms, Continuity, Diode,
and 50 Ω Range)

Measurement Softkey Connect Leads

Resistance

1 Ω

(default)

ahr11f.eps

Continuity 2 R

ahr12f.eps

Diode 3 G

Main

Display

Upper

Display

Ω --

Ω

OPEn

or

Shrt

(beeps on

short)

V--

1

50 Ω

1

See application below.

4 50 Ω

Forward bias
Reverse bias

ahr13f.eps

Ω --

ahr14f.eps

18

True RMS Digital Multimeters

Operating Basics

Application: Measuring Low Resistance Values

To measure low resistance values to 0.01 Ω resolution, set the meter to 50 Ω
mode and short the leads together to subtract the lead resistance from low­resistance measurements. If you do not short the leads together, the meter will
not enter 50 Ω mode. The lead resistance must be less than 5 Ω. The measured
resistance shows on t he main display.

Caution

To avoid damaging the meter, remove all power from the
circuit before connecting the test leads.

Capacitance Measurement

Measurement Softkey

Capacitance (no

selection)

Connect

Leads

ahr15f.eps

Main

Display

F--

Upper

Display

Caution

To avoid damaging the meter, remove all power from the
circuit before connecting the test leads.

Measuring large-value capacitors may take seve ral seconds.
Follow the procedures below when making capacitance measurements:

• Remove capacitors from circuitry.

• Discharge capacitors before measuring them.

• To measure small values of capacitance accurately, press

the leads are open.

REL t

when

19

183 & 185

Users Manual

Temperature Measurements (185 only)

Measurement Softkey

Celsius
temperature
(default)

Fahrenheit
temperature

1 °C °C Ambient

2 °F

Connect

Leads

Thermocouple

probe adapter

K-Type

Temperature probe

ahr16f.eps

Main

Display

°F Ambient

Upper

Display

temp. °C

temp. °F

Before you take a temp erature measurement, momentarily change the
temperature of the thermocouple to verify a shorted or open thermocouple is
not incorrectly displaying the ambient temperature.

Helpful Tip: Increased Temperature Accuracy

To achieve high accuracy temperature measurements to ±1.0 °C it is necessary
to calibrate the meter to account for any thermocouple offset. Temperature
accuracy without performing the following calibration is ±3 °C:

1. Turn on the meter in the environme nt you will make the measurements.

2. Fill a wide, shallow container with ice and water. Stir the ice and water

mixture for two or three minutes to evenly distribute the temperature of
the mixture. Place the container next to the meter and submerge the tip of
the bead probe in the ice and water.

3. While in °C or °F mode, allow the temperature reading to stabilize on a
value (this va lue should b e very close to 0 °C for °C mode or 32.0 °F for
°F mode). Any deviation from 0 °C or 32 °F represents the

thermocouple’s offset.

4. Once the reading stabilizes, press and hold softkey
softkey

2

for °F mode for five seconds until the display shows 0000 or

1

for °C mode or

0032.

20

True RMS Digital Multimeters

Operating Basics

This calibrates the meter for the operating environment. t shows in the upper
display. If you hear an error beep, the offset is greater than ±5 °C. You can
repeat this calibration at any time. To undo this calibration, return the meter to
factory settings by pressing both the yellow (shift) button and

MIN MAX while

powering up the meter (see Table 3. Power-up Options).
To insure accuracy of temperature measurements, you should follow this

procedure when using other K-type thermocouple probes with the 183/185
DMMs because accuracy specifications vary in different types of probes.

Note

Observe proper polarity on the probe adapter and do not calibrate
the offset immediately following high amperage measurements.

Current Measurements

Measurement Softkey Connect leads

True RMS AC

1 AC AC Hz

Main

Display

Upper

Display

Amps
DC Amps

2 DC DC --

(default)
Amps AC DC

dual display
Amps AC+DC

total RMS

1

4-20 mA
current %

2

3 AC
DC or
AC+DC
(press to
toggle)

4

20 mA

LoadCurrent

source

ahr17f.eps

DC AC

AC+DC Hz

DC %

(185 only)

1

2

4-20 mA measurement is used in process loop calibration. % = (measured

22

IDCIACIrms +=

current – 4 mA)/16 mA

21

183 & 185

Users Manual

When overrange occurs in manual range, the meter will uprange in order to
protect the internal circuitry.

Caution

To avoid damaging the meter, limit large current
measurements to 15 A for 30 seconds and allow ten
minutes of cooling between measurements.

Do not attempt to measure current with batteries removed.

When you exit current measurement mode, the words
the display reminding you to remove your test lead from the A (amps) input
connector.

When you make high cur rent measurements, >15 A, use a current clamp probe
(optional accessory).

CHEC ProbE

show on

Button and Softkey Overview

Yellow (Shift) Button

To access functions in yellow text, press the yellow (shift) button and then
press a function button while the
shows on the disp lay for five seconds.

Press and hold the yellow(shift) button for two seconds to access the Setup
menu. See "Setup Menu" for more information.

S

indicator is on. The

S

indicator

RANGE Button

Use the RANGE button to manually select a range. Press and hold RANGE for
two seconds to return the meter to auto range mode. The meter is in auto range
mode when the

The range and units are displayed above the
bargraph.

AUTO indicator is on.

AUTO indicator, to the right of the

22

True RMS Digital Multimeters

Button and Softkey Overview

MIN MAX (Minimum, Maximum) Button

Press this button to scroll through the live, maximum, mini mum,

maximum–minimum, and average value. The elapsed time between the last
recorded event and the start of the test shows in the upper display.

Press and hold
See "MIN MAX AVG Operation" for more information.

MIN MAX for two seconds to exit MIN MAX mode.

FAST MIN MAX (1 ms Peak)

To activate 1 ms peak, first press the yellow (shift) button and then MIN MAX
while the
fast mode, the LCD displays the
resolution in fast MIN MAX is 5,000 counts. Live and average (AVG)
readings are not available in fast MIN MAX mode.

You can use FAST M IN MAX whe n you take AC or DC measurements. The
meter only records events that have a pulse width that is greater than 1 ms.

Press
value shown is the value of the positive peaks and the MIN value shown is the
value of the negative pe aks.

Press and hold

S

MIN MAX to view 1ms peak minimum and maximum values . The MAX

indicator shows on the display. When in

FAST

MIN MAX for two seconds to exit FAST MIN MAX mode.

and

M

indicators. Display

Backlight Button (s)

Press s to turn the backlight on or off. Adjust the LOFF setting in the Setup
menu to adjust the backlight timeout setting. To adjust the setting for the
backlight , refer to the "Setup Menu" section.

HOLD Button

Press HOLD to turn hold mode on and off. When you activate the hold feature,
the instrument beeps, freezes the display, and displays the
Hold mode freezes the display so you can remove the probes from the test
points without losin g the measurement reading.

HOLD indicator.

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Auto Hold

To activate auto hold, press down on HOLD until A HOLD appears on the
display. Auto hold is not available for capacitance or AC DC measurements.

In auto hold mode the display automatically freezes and the instrument beeps
when the measurement reading stabilizes. The displayed value will be updated
when the meter stabilizes on a new measurement value.

Auto hold is useful when it is not possible for you to press
meter display while probing and taking measurements.

REL

Use this button to set the meter to d elta mode and make relative measurements.
The reference value for the t measurement can be a measured, a stored, or a
programmed value.

t

When you take the measurement and the meter settles on the measurement
value, press
subtracted from the actual measurement.

t

Use the measurement function knob and softkeys to set the meter to the
measurement function you want. Use the memory information in the "MEM
(Memory)" section to recall (RCL) a reference value from memory, then press

REL

t Button (Making Relative (

Relative to a Measured Value

REL t

. For subsequent readouts, the measured reference value is

Relative to a Saved Value

t

. To exit delta mode, press REL t.

REL

t) Measurements)

HOLD or see the

For subsequent readouts, the recalled reference value is subtracted from the
actual measurement.

24

True RMS Digital Multimeters

Button and Softkey Overview

t

Relative to a Programmed Value

Use the measurement function knob and softkeys to set the meter to the
measurement function and range you want and then press
meter is in delta mode, press and ho ld the yellow (shift) button until the Setup
menu appears. Use the softkeys to edit rEF to the desired value and press
softkey

For subsequent readouts the programmed reference value is subtracted from
the actual measurement. The programmed reference value is lost when you
turn off the meter.

4

for OK. To exit delta mode, press

REL

t

.

REL

t

. While the

You can also use
and dBm Voltage Measurements" for more information.

REL

t

to make relative dB (t

dB) measurements. See "dB

MEMORY

Use the memory mode to store and recall measurement values. No data is lost
during power cycles.

To activate the MEMORY mode, press the

t

while

selections:

SHIFT shows on the LCD display. The display shows four softkey

STO, RCL, CLR, and EXIT.

yellow (shift) button and then REL

STO

Select STO to store the held value in the next available memory location. The
memory location number momentarily shows on the upper display. If no
memory locations are available,
seconds and nothing is stored.

To overwrite an existing memory value, recall the memory location using the

RCL button, press CLR, then press STO to store the new value in this location.

FULL shows on the upper display for two

RCL

Select RCL to scroll through the stored values in reverse order. The upper
display momentarily shows the memory location while the main display shows
the value stored in that location.

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CLR

Select CLR to clear the currently selected memory location. The location is

replaced with “

-----”.

To clear all memory locations, press and hold
shows on the display next to the CLR enunciator. The word

CLR for five seconds. A ?

donE

shows on
the display indicating that all memory locations are clear and you can release
the button. If you release the button before the word

donE

shows, no data is

cleared from the memory.

EXIT

Select EXIT to exit memory mode. You can also exit memory mode by
pressing any button.

Softkeys (

1 2 3 4

)

Each setting on the measurement function knob may activate one or more
softkey settings on the LCD. If there is more than one measurement for a
function knob setting, a softkey menu appears on the display. Press the
corresponding softkey to select the desired measurement.

Setup Menu

The Setup menu allows you to customize default settings. To activate the
Setup menu, press and hold the yellow (shift) button for two seconds.

Use the softkeys as shown in the following table to edit setup values. Setup
menu values are saved when you turn off the meter, except for reference
values.

Softkey 1 + 2 – 3 ← 4 OK

Function

Press to
increase
setting
value

Press to
decrease setting
value

Press to step to
next digit in
settin g value

Press to sa ve
setting and
move to next
setup
parameter

26

True RMS Digital Multimeters

Special Features

Table 2 lists the setup menu prompts, the definition of parameters, and default
values.

Table 2. Setup Prompts, Definitions, and Default Values

Upper Display

Prompt

POFF Sets auto-off time (in minutes) 30 minutes
LOFF Sets backlight auto-off time (in seconds) 60 seconds
bEEP Toggles beeper on and off ON
HrES Changes display to 50,000 counts OFF
POL (Duty) Scrolls through OFF, POS (positive duty

EdGE (Hz) Toggles between POS (positive edge) and

1

rEF

(t)rEF(dB)

1

Meter must be in REL t or dB mode to access these setup parameters

1

(press OK to cycle through parameters)

factor), and NEG (negative duty factor)

NEG (negative edge) triggering in Hz
measurement

Changes the reference value for delta
measurements

Changes the reference value for dB
measurements

Definition of Parameter

Default

Value

OFF

Positive
(rising)

Value before
REL t is
pressed

1 V

Special Features

High Resolution (HrES) 50,000-Count Mode

By default, the meter is set to 5,000-count mode. For 50,000-count mode, press
the yellow (shift) button when you turn on the meter. To change the default
resolution to 50,000-count mode, use the Setup menu information in the
"Setup Me nu" section.

The following measurements are limited to 5,000-count mode: 50 Ω, 50 MΩ
1 ms peak hold, AC + DC amps, AC DC amps, AC + DC volts, AC DC volts,
capacitance, and Hertz dual display mode.

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Beeper

A single beep indicates correct operation. You can turn the single-beep feature
off in the Setup menu. A double beep indicates a warning or error condition. A
triple beep indicates the meter will auto-off in one minute. Continuous beeping
indicates there is circuit continuity while in continuity mode. You can not
disable double, triple, or continuous beeps.

Auto-Off

The auto-off feature automatically turns off the meter if no controls or settings
are changed within a set amount of time. To turn on the meter a fter auto-off,
press any button. The meter will return to the state it was in before auto-off
occurred, but held values are lost.

Use the Setup menu to adjust the auto-off delay. The default auto-off time is
thirty minutes. You can disable auto-off by pressing
the meter or by using the Setup menu.

HOLD when you turn on

Auto-off is disabled during MIN MAX mode.

Power-Up Options

To activate power-up functions, press and hold a button or softkey when you
turn on the meter. Hold the button or softkey until you hear a single beep and
see a text acknowledgment on the display (see Table 3 below). The following
table lists all power-up options. Most of the power-up option descriptions also
appear on the rear panel.

When you turn off the meter, the power-up options are not saved. Use the
Setup menu to change default settings.

28

True RMS Digital Multimeters

Special Features

Table 3. Power-up Options

Button Power-up Function Explanation

RANGE

(HI

Ω

1

mV)

MIN MAX

(

1 SEC

1

)

RELt

(

bEEP

1

)

Shift
(yellow
button)

(

HrES

1

)

LIGHT

(

LOFF

1

)

Sets meter to 500 mV
high impedance mode

Enables high impedance (> 10 MΩ)
across the input jacks in the 500 mV
DC range so that the device under
test is not loaded when you measure
small voltages.

Sets meter to 1
second MIN MAX

See "MIN MAX"
information.

for more

mode
Turns off beeper Double, triple, and continuity beeps

are not affected.

Sets meter to high
resolution (50,000

See "High Resolution (HrES) 50,000­Count Mode" for further information.

count) mode

Disables light timeout --

Softkey

1

Displays software
version and calibration
date

Displays the software version
(M.mm, where M is the major
revision and mm is the minor
revision). Press softkey 1 again
to display the date the meter was last
calibrated (upper display shows
month and main display shows year).

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Users Manual

Table 3. Power-up Options (Cont.)

Button Power-up Function Explanation

Softkey 2 Overall Diagnostics Displays all LCD segments.

Press softkey 2 again to
hear the beeper. Press softkey
2 again to perform button
and knob diagnostics. The
display shows two two-digit
numbers. The numbers on the
left confirm the knob location
and the numbers on the right
confirm the button operation.
To exit diagnostics, turn off
meter.

Softkey 3 LCD test Displays al l LCD segments so

you can verify corre ct LCD
operation and display.
Compare this to the LCD figure
in the "Display Indicators"
section.

Softkey 4 Battery test Displays the voltage across

the battery terminals. The
meter will shut off at 1.5 V.

HOLD (

POFF

YELLOW and MIN
MAX (

rESEt

1

)

)

Disables auto-off -­Resets meter to factory

default settings

You must press both buttons
at the same time while
powering on the meter.

1

The bolded text in parentheses in the Button column shows when the meter registers
the power-up setting. Do not release the button until y ou either hear a single beep or
see the text.

30

True RMS Digital Multimeters

Special Features

MIN MAX AVG Operation

Press MIN MAX to start recording MIN MAX values. In 5,000 count mode the
MIN MAX default recording rate is 4 measurements per second. Press and
hold

MIN MAX when turning on the meter to apply averaging, which reduces

the recording rate to 1 measurement per second (1 sec MIN MAX).
The

MIN MAX button cycles through the operations listed in Table 4.

Table 4. Min/Max Operations

Display

Indicator Description

M The live signal value is shown. The upper display shows the

elapsed time since the recording began.

MAX The MAX indicator and maximum value are shown. The upper

display shows the timestamp at which the maximum value
occurred, relative to the start of the test.

MIN The MIN indicator and minimum value are shown. The upper

display shows the timestamp at which the minimum value
occurred, relative to the start of the test.

MAX–MIN The MAX–MIN indicator and maximum value minus minimum

value are shown. The upper display shows the time difference
between the MAX and MIN events.

AVG The AVG indicator is shown and the value shown is the

average value of all meter readings. The upper display shows
the elapsed time since recording began.

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Once you set the meter to MIN MAX mode, the meter will uprange, or
automatically increase range setting, but will not downrange. You must exit
MIN MAX mode to restore downranging abilities to the meter.

While in MIN MAX mode, press
most recent MIN MAX values. Press
values. Press

HOLD a second time to reset and restart the MIN MAX

HOLD to stop the recording and freeze the

MIN MAX to cycle through the held

recording.
While in MIN MAX mode, activate memory mode to hold the displayed MIN

MAX value for storage into memory without stopping or resetting the MIN
MAX recording.

To exit MIN MAX mode and clear stored values, press and hold

MIN MAX for

two seconds.

Auto Fuse Detection

The meter automatically verifies the integrity of the internal fuse when you set
the measurement function knob to A. If an open fuse is detected, the word

FUSE

See "Replacing the Fuse" for instructions on how to replace fuse F1.

shows on the main display.

32

True RMS Digital Multimeters

Specifications

Specifications

All specifications are warranted, unless noted as typical, for the rated
temperature range of 23 °C

Characteristics Description

LCD display digits 3 4/5 (default) or 4 4/5
Display counts 5,000 (default) or 50,000
Bargraph 20 segment, updated 20 times per

Memory locations 183: 10, 185: 30

± 5 °C at less than 80% relative humidity.

second

Out of range indicator

Low voltage indicator Battery symbol shows on LCD at 2.0 V.

Battery life 100 hours continuous use with

Auto-off Adjustable, 30 minute default
Power source Two AA 1.5 V alkaline batteries

Maximum input voltage between
terminals and between terminals
and earth.

F1 fuse protection 11 A (1000 V) service-replaceable
Backlight Green LEDs

1

If the meter is exposed to water have it inspected by qualified service

personnel.

OL

: overrange

Ur

: underrange

Meter powers down at 1.5 V.

backlight off (typical)

(NEDA 15 A)
1000 V RMS

1

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Users Manual

Table 5. DC Voltage Characteristics

Characteristic Description

Settling time 3 readings (typical)
Reading rate 5,000 ct.: 4 readings per second

50,000 ct.: 1 reading per second

Rejection ratio

Common mode 120 dB at DC or 50 Hz or 60 Hz
Normal mode 60 dB at 50 Hz or 60 Hz

Input impedance 10 MΩ (typical)

Table 6. DC Voltage Range, Resolution, and Accuracy

Resolution Accuracy

Range

5,000

counts

50,000

counts 183 185

0.5 V 100 µV 10 µV

±(0.07% + 1

count)

1

± (0.05% + 1
count)

5 V 1 mV 100 µV
50 V 10 mV 1 mV
500 V 100 mV 10 mV
1000 V 1 V 100 mV
Temperature coefficient Add (0.005% + 0.1 ct.)/°C to accuracy

beyond rated temperature range.

1

Accuracy in 50,000-count mode is % + 10 counts.

34

True RMS Digital Multimeters

Specifications

Table 7. AC Voltage Characteristics

Characteristic Description

Input impedance 10 MΩ in parallel with 100 pF (typical)
Settling time 4 readings (typical)
Reading rate 5,000 ct.: 4 readings per second

50,000 ct.: 1 reading per second
Common mode rejection ratio 60 dB at DC to 60 Hz
Crest fact or, maximum Full scale: 3

Half scale: 6
AC+DC1 total RMS volts accuracy AC (RMS) accuracy + 0.1% + 1 count
AC DC1 dual display accuracy DC Accuracy + 0.05% + 1 count

AC RMS Accuracy + 0.1% + 1 count
Upper display frequency (5,000 counts)

Accuracy ± (0.002% + 1 count) for 20 Hz to 20 kHz

Sensitivity 10% of selected voltage range
dB reference
dBm reference

1

5,000-count mode only.

2

See "dB and dBm Voltage Measurements" for dB and dBm calculations.

2

2

1 VRMS (adjustable)
775 mV across 600 Ω (1 mW)

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Table 8. AC Voltage Range, Resolution, and Accuracy

Resolution Accuracy

Range

5,000

Counts

50,000

Counts 183 185

0.5 V 100 µV 10 µV
5 V 1 mV 100 µV
50 V 10 mV 1 mV
500 V

1000 V

2

2

100 mV 10 mV

1 V 100 mV 40 Hz – 10 kHz:

AC: Add (0.03% + 0.1 ct.)/°C beyond rated

Temperature coefficient

temperature range.
AC+DC: Add (0.06% + 0.1 ct.)/°C beyond rated

temperature range.

40 Hz – 20 kHz
± (0.6% + 2
counts):

± (0.6% + 2
counts)

1

40 Hz – 20
kHz: ± (0.4%
+ 2 counts)

40 Hz – 10
kHz: ± (0.4%
+ 2 counts)

1

Accuracy in 50,000-count mode is % + 20 counts.

2

For voltages > 100 V, the maximum volts–Hz product < 1 X 107 VHz.

Table 9. DC Current Characteristics

Characteristics Description

Burden voltage 5 mA to 5 A: 0.3 V max.

10 A: 0.5 V max.

Percent 4-20 mA (calculated in 50
mA range)

4 mA = 0%

20 mA = 100%
Settling time 4 readings (typical)
Reading rate 5,000 ct.: 4 readings per second

50,000 ct.: 1 reading per second

36

True RMS Digital Multimeters

Table 10. DC Current Range, Resolution, and Accuracy

Resolution Accuracy

50,000

Range 5,000 Counts

Counts 183 185

Specifications

500 µA 100 nA 10 nA ± (0.2% + 4 counts)
5 mA 1 µA 100 nA

± (0.2% + 2 counts)
50 mA 10 µA1 µA
500 mA 100 µA 10 µA
5 A 1 mA 100 µA ± (0.4% + 2 counts)

10 A for 3 minutes

10 mA 1 mA ± (0.8% + 2 counts)

(15 A for 30 sec.)
Allow 10 minutes of
cooling between
measurements

Temperature
coefficient

1

Accuracy in 50,000-count mode is % + 40 counts.

2

Accuracy in 50,000-count mode is % + 20 counts.

Add (0.05% + 0.1 ct.)/°C beyond rated
temperature range.

Table 11. AC Current Characteristics

1

2

2

2

Characteristics Description

Burden voltage 0.5 mA to 5 A: 0.9 V max.

10 A: 1.0 V max.

AC+DC1 Accuracy AC RMS amps accuracy + DC amps

accuracy
Upper display frequency
Accuracy ± (0.002% + 1 count) for 20 Hz to 5 kHz
Sensitivity 10% of range
Settling time 4 readings (typical)
Reading rate 5,000 ct.: 4 readings per second

50,000 ct.: 1 reading per second

1

5,000-count mode only.

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Users Manual

Table 12. AC Current Range, Resolution, and Accuracy

Resolution Accuracy

Range

5,000

Counts

50,000

Counts 183 185

0.5 mA 100 nA 10 nA
5 mA 1 µA 100 nA
50 mA 10 µA1 µA
500 mA 100 µA 10 µA
5 A 1 mA 100 µA
10 A for 3 minutes

10 mA 1 mA
(15 A for 30 sec.)
Allow 10 minutes
of cooling
between
measurements

1,2

40 Hz – 1 kHz:

± (0.6% + 2 counts)

1 kHz – 5 kHz:

± (7.5% + 2 counts)

Temperature coefficient Add (0.05% + 0.1 ct.)/°C beyond rated

temperature range.

1

Accuracy in 50,000-count mode is % + 20 counts.

2

> 5% of range.

Table 13. Resistance (Ω) Characteristics

Characteristics Description

Update rate 5,000 ct.: 2 readings per second

50,000 ct.: 1 reading per second
50 MΩ: 1 reading per second

Settling time 50 Ω to 5 MΩ range: 3 readings (typical)

50 MΩ range: 4 readings (typical)
Compliance voltages (typical) 0.6 V (50 Ω and 500 Ω range is 1.3 V)
Common mode rejection ratio 60 dB at DC, 50 Hz, or 60 Hz
Normal mode rejection ratio 20 dB at ≥ 50 Hz

38

True RMS Digital Multimeters

Specifications

Table 14. Resistance Range, Resolution, and Accuracy

Resolution Accuracy

Range 5,000 Counts 50,000 Counts 183 185

50 Ω 0.01 Ω

1

–– ± (0.1% + 10

counts)

500 Ω 0.1 Ω 0.01 Ω± (0.1% + 4

counts)

2

5 kΩ 1 Ω 0.1 Ω± (0.1% + 2

counts)

3

50 kΩ 10 Ω 1 Ω
500 kΩ 100 Ω 10 Ω
5 MΩ 1 kΩ 100 Ω± (0.4% + 4

counts)

2

50 MΩ 10 kΩ –– ± (1.0% + 4

counts)

2

Temperature coefficient 50 Ω to 500 kΩ: Add (0.03% + 0.1 ct.)/°C

beyond rated temperature range.
5 MΩ to 50 MΩ: Add (0.2% + 0.1 ct.)/°C

beyond rated temperature range.

1

5,000 count mode only.

2

Accuracy in 50,000-count mode is % + 40 counts.

3

Accuracy in 50,000-count mode is % + 20 counts.

Table 15. Continuity Characteristics

Characteristics Description

Beeper sounds when resistance is 100 Ω or

Continuity threshold

less (typical)

Response time < 1 ms

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Table 16. Diode Test Characteristics

Characteristics Description

Test current (typical) 0.35 mA
Test voltage 3.3 V maximum, open circuit
Accuracy ± 1.0%

Table 17. Capacitance Range, Resolution, and Accuracy

(5,000 counts only)

2

Range Resolution

3

5 nF

1 pF ± (1.0% + 5 counts) (using REL t mode)

Accuracy

1

183 185

50 nF 10 pF ± (1.0% + 3 counts) (using REL t mode)
500 nF 100 pF

± (1.0% + 3 counts)
5 µF1 nF
50 µF 10 nF

± (3.0% + 3 counts)
500 µF 100 nF
5 mF 1 µF
50 mF 10 µF
Temperature

Add (0.05% + 0.1 ct.)/°C beyond rated temperature range.

coefficient

1

5,000 count mode only.

2

> 1% of range.

3

± (1% + 10) below 0.500 nF

40

True RMS Digital Multimeters

Specifications

Table 18. Frequency Characteristics, Resolution, and Accuracy

Characteristics Description

Signal coupling AC
Minimum frequency 0.5 Hz
Maximum frequency 1 MHz
Accuracy ± (0.002%) + 1 count
Best resolution 10,000 count: 0.01 Hz

100,000 count: 0.001 Hz

Temperature coefficient Add 0.00004%/°C beyond rated temperature

range.

Table 19. Frequency Voltage Range

Range Sensitivity, 10 Hz - 100 kHz Sensitivity, 1 MHz

1

500 mV 100 mV ––

5 V 500 mV 2 V
50 V 5 V 20 V
500 V 50 V ––

1

For voltages > 100 V, the maximum volts–Hz the meter is < 107 VHz.

Table 20. Duty Factor Characteristics

Characteristics Description

Range 1 Hz to 100 kHz
Accuracy ± (0.1% + 0.05% per kHz) for 5 V input (logic

signals only)
Signal coupling DC
Resolution 0.1%
Sensitivity 30% of range

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Table 21. Temperature Characteristics

Characteristics Description

Main di splay
Range –50 °C to +980 °C

Accuracy ± 3 °C1 (typical)
Thermocouple type K
Upper display

Accuracy ± 3 °C of ambient temperature (typical)

1

Use the water and ice offset calibration method in the "Temperature

Measurements (185 only)" section for accuracy to ±1.0 °C.

Table 22. FAST MIN MAX (1 ms)Characteristics

Characteristics Description

Accuracy

1

Specified voltage or current measurement
± 30 counts of the peak value of a single 1ms
pulse.

1

5,000-count mode only.

Table 23. Physical Characteristics

Characteristic Description

Dimensions (H × W × D) 38 mm × 88 mm × 183 mm (without holster)
Weight (with batteries) 383 g (13.5 oz)
With holster 539 g (1 lb 3 oz)

42

True RMS Digital Multimeters

Table 24. Environmental Characteristics

Characteristic Description

Temperature

Operating –10 to +50 °C

Non-operating (storage) –40 to +60 °C

Humidity –40 to +35 °C: < 80%

+35 to +40 °C: < 70%
+40 to +60 °C: < 55%

Altitude

Operating 2,000m (6,562 ft)

For altitudes from 2,000 m up to
3,000 m (9,843 ft) derate voltage input to
600 VAC CAT III.

Specifications

Non-operating (storage) 12,300 m (40,354 ft)
Vibration

Operating 2.66 gRMS, 5 to 500 Hz, 3 axes

(10 minutes each)

Non-operating 3.48 gRMS, 5 to 500 Hz, 3 axes

(10 minutes each)

W Warning

This meter is sensitive to strong external magnetic fields.
Do not use the meter within 1-inch (2.54 cm) of strong

external magnetic fields such as that produced by the
Fluke ToolPak hanging magnet accessory. Incorrect
readings may result. If erratic behavior is noted, turn meter
off to reset.

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Category Standards or description

Table 25. Certifications and Compliances

EC Declaration of Conformity

– EMC

Australia/New Zealand
Declaration of Conformity –
EMC

EC Declaration of Conformity
– Low Voltage

Meets intent of Directive 89/336/EEC for
Electromagnetic Compatibility.
Compliance was demonstrated to the
following specifications as listed in the
Official
Journal of the European Communities:

EN 61326 Class A

1,2

Complies with EMC provision of Radio
communications Act per the following
standard(s):

AS/NZS 2064.1/2 Class A Radiated
Emissions

Compliance was demonstrated to the
following specification as listed in the
Official Journal of the European
Communities:

Low Voltage Directive 73/23/EEC as
amended by 93/69/EEC.
EN 61010-1/A2:1995

Safety requirements for electrical
equipment for measuring control, and
laboratory use.

U.S. Nationally Recognized
Testing Laboratory Listing

ANSI/ISA S82.01-1994
CAN/CSA C22.2 No. 1010.1

Safety requirements for electrical
equipment for measurement, control,
and laboratory use

Additional Compliance IEC61010-1/A2:1995

Safety requirements for electrical
equipment for measurement, control,
and laboratory use.

44

True RMS Digital Multimeters

Table 25. Certifications and Compliances (cont.)

Category Standards or description

Specifications

Installation Category
DUAL RATINGS

Complies with IEC 1010-1 to 1000 V Overvoltage
Category III, Pollution Degree 2; and IEC 664-1 to
600 V Overvoltage Category IV, Pollution Degree 2

OVERVOLTAGE (Installation) Categories refer to the
level of Impulse Withstand Voltage protection provided
at the specified Pollution Degree.

• Overvoltage Category III equipment is equipment
in fixed installations. Examples include switch
gear and polyphase motors.

• Overvoltage Category IV equipment is equipment
for use at the origin of the installation. Examples
include electricity meter and primary over-c urrent
protection equipment.

Pollution Degree A measure of the contaminates that could occur in the

environment around and within a meter. Typically the
internal environment inside a meter is considered to
be the same as the external. Meters should be used
only in the environment for which they are tested.

Pollution Degree 2 Normally only dry, nonconductive pollution occurs.

Occasionally a temporary
conductivity that is caused by condensation must be
expected. This location is a typical office/home
environment. Temporary condensation occurs only
when the meter is out of service.

Pollution Degree 3 Conductive pollution, or dry, nonconductive pollution

that becomes conductive due to condensation. These
are sheltered locations where neither temperature nor
humidity is controlled. The area is protected from
direct sunshine, rain, or direct wind.

1

Add 25 counts (250 counts in 50,000 count mode) to the accuracy

specifications when in the presence of an RF field as defined in IEC801–3.

2

Amps DC: Add 60 counts (600 counts in 50,000 count mode) to the amps
accuracy specifications when in the presence of an RF field as defined in
IEC801–3.

45

183 & 185

Users Manual

Accessories

This section lists all standard accessories for the 183 and 185 true RMS digital
multimeters.

Table 26. Standard Accessories

Standard accessory Product or part number

Test lead set TL75, or equivalent
Test leads

(1 red, 1 black)
Alligator clips (185 only)

(1 red, 1 black)
Protective Holster PN 1556861

Installed dry cell batteries - Two AA 1.5 V alkaline batteries (IEC

W Fuse (installed)
11 A, 1000 VRMS

Users Manual

Language Part Number

English
English, French, Spanish,

Portuguese
English, French, German, Italian,

Dutch

Certified to 1000 V CAT III

AC70 (red) PN 738120
AC70 (black) PN 738047

LRG or ANSI/NEDA 15A)
PN 803293

FUSE, 11A, 1000V

1574586
1574599

1574607

English, Simplified Chinese,
Traditional Chinese, Korean,
Japanese

English, Danish, Finnish, Norwegian,
Swedish

46

1574629

1587740

True RMS Digital Multimeters

Setup for Optional Computer Interface Accessory (FlukeView Forms)

Setup for Optional Computer Interface
Accessory (FlukeView Forms)

Follow the steps below to set up the computer interface accessory (see Figure 8):

1. Press the plastic receptacle into place in the top of the DMM protective

holster. Connect the FlukeView cable to the plastic receptacle.

2. Connect the other end of the FlukeView cable to your computer using the

9-pin connector. If you require a 25-pin connection to your PC, you will
need to use a 9-pin-to-25-pin adapter.

3. Insert FlukeView Forms CD-ROM into your computer drive and proceed

with software installation. Refer to the FlukeView Forms documentation
for further instructions on using Fl ukeView Forms.

You can find further information about FlukeView Forms features on the
FlukeView Forms CD-ROM.

Plastic receptacle

Figure 8. Setup for the Optional Computer Interface Accessory

Cable

9–pin connector

ahr18f.eps

47

183 & 185

Users Manual

Using Protective Holster and Tilt-Stand

ahr19f.eps

Figure 9. Holster and Tilt Stand

Battery Replacement

When you replace a battery, the meter calibration is not affected and the stored
data is not lost.

Refer to Figure 10 to replace the battery.
Remove the battery cover only in a clean, dry environment.
See Table 26 for the descriptions and part numbers of the replaceable batteries.

48

TRUE RMS MULTIMETER

185

True RMS Digital Multimeters

Servicing the Meters

4

F

3

F

2

F

1

F

Hz

V

RANGE

MIN MAX

FAST MN MX

HOLD

REL

A

MEMORY

V

COM

OFF

A

10A MAX

FUSED

1

Hz

CAT

1000V

2

ahr20f.eps

A Batteries (2 AA alkaline or rechargable)
B Battery Cover

Figure 10. Replacing the Batteries

Servicing the Meters

Only qualified personnel should perform service procedures. Read the Safety
Information section before performing any service procedures.

WWarning

• Do not service alone. Do not perform internal service or

adjustments of this meter unless another person capable
of rendering first aid and resuscitation is present.

• Use care when servicing with power on. Dangerous

voltages or currents may exist in this meter. Disconnect
power, remove battery (if applicable), and disconnect test
leads before removing protective panels, soldering, or
replacing components.

• To avoid electric shock, do not touch exposed

connections.

• Service only in a clean, dry environment.

• Annual calibra tion verification is recommended.

• Installing improper fuses can cause injury and meter

damage.

49

183 & 185

Users Manual

Replacing the Fuse

Follow the steps below to access and replace the service-replaceable fuse:

1. Remove the battery cover. Remove the batteries and two screws on both

sides of the batteries (see Figure 11).

Remove 2 screws

(1566978)

Remove gasket

(1567042)

Figure 11. Opening the Case

2. Carefully insert a screwdriver between the gasket and meter case and

gently li ft and remove the gasket. You must re move the gasket before
opening the meter case.

3. Carefully lift the rear panel of the meter up to access the fuse F1 (see

Figure 12). Remove and replace the fuse. Refer to Table 26 for more
information on which fuse to use.

WWarning

Installing improper fuses can cause injury and meter
damage.

4. Verify meter calibration after replacing F1.

ahr21f.eps

50

True RMS Digital Multimeters

General Care and Cleaning

Fuse F1

ahr22f.eps

Figure 12. Fuse Access

General Care and Cleani ng

Caution

Protect the meter from adverse weather conditions.

•

Do not expose the LCD display to direct sunlight for long

•

periods of time.
To avoid damage to the meter, do not expose the interior

•

of the meter to sprays, liquids, or solvents.

Clean the exterior of the meter by removing dust with a lint-free cloth. Use
care to avoid scratching the clear plastic display filter.

For further cleaning, use a soft cloth or paper towel dampened with water. You
can use an alcohol-free glass cleaner for more efficient cleaning.

Caution

To avoid damage to the surface of the meter, do not use
abrasive or chemical cleaning agents.

51

183 & 185

Users Manual

WWarning

The meter is not protected from exposure to water.
Exposing the meter to water can create a shock hazard.

If the meter is exposed to water, open the case and allow the meter to fully dry.
To open the meter, use the procedure in the "Servicing the Meters" section.

52