Fluke 175 User manual

May 2003 Rev. 3, 4/23

All product names are trademarks of their respective companies.

175, 177, 179

True-rms Multimeters

Users Manual

Introduction

The Fluke 175, 177, and 179 are battery-powered, True-rms

multimeters (the Product) with a 6000-count, 3 3/4-digit display

and a bar graph. This manual applies to all three models. All

figures show the 179.

Contact Fluke

Fluke Corporation operates worldwide. For local contact

information, go to our website: www.fluke.com

To register your product, view, print, or download the latest

manual or manual supplement, go to our website.

+1-425-446-5500

[email protected].

Safety Information

General Safety Information in the printed Safety Information

document that ships with the Product. It can also be found online

at www.fluke.com. More specific safety information is listed in this

manual where applicable.

In this manual, a Warning identifies conditions and procedures

that are dangerous to the user. A Caution identifies conditions

and procedures that can cause damage to the Product or the

equipment under test.

Unsafe Voltage

During a voltage measurement, the Product alerts you to the

presence of a potentially hazardous voltage. When the Product

detects a voltage ≥30 V or a voltage overload (0L), the Ysymbol

shows on the display to alert you to the presence of a potentially

hazardous voltage.

175, 177, 179

Users Manual

Product Disposal

Dispose of the Product in a professional and environmentally

sound manner:

•Delete personal data on the Product before disposal.

•Remove batteries that are not integrated into the electrical

system before disposal and dispose of batteries separately.

•If this Product has an integral battery, put the entire Product in

the electrical waste.

Test Lead Alert

To remind you to check that the test leads are in the correct

terminals, LEAd momentarily shows on the display when you move

the rotary switch to or from the mA or Aposition.

XW Warning

Attempting to make a measurement with a test lead in an

incorrect terminal might blow a fuse, damage the

Product, and cause serious personal injury.

Terminals

Table 1 shows the terminals on the Product.

Table 1. Terminals

FUSED

aik01f.em

Item Description

AInput terminal for ac and dc milliamp measurements to

400 mA and frequency measurements.

BInput terminal for ac and dc current measurements to

10 A and frequency measurements.

Input terminal for voltage, continuity, resistance, diode,

capacitance, frequency, and temperature (179 only)

measurements.

DCommon (return) terminal for all measurements.

True-rms Multimeters

Product Buttons

Table 2 identifies the basic functions of the buttons on the Product.

The buttons have other functions described later in the manual.

Table 2. Product Buttons

RANGEHOLD MINMAX

1 2 3 4 5

aik14.em

Item Description

Toggles the backlight on and off. The backlight

automatically turns off after 2 minutes (177 and 179

only).

In MIN MAX AVG mode, push to pause or continue

MIN MAX AVG recording.

In the Display HOLD mode, the Product holds the

reading on the display.

In the AutoHOLD mode, the Product holds the

reading on the display until it detects a new stable

reading. Then the Product beeps and displays the

new reading.

Table 2. Product Buttons (cont.)

Item Description

CActivates MIN MAX AVG mode.

Toggles between Auto Range and Manual Range

modes.

In Manual Range mode, increments the range. After

the highest range, the Product wraps to the lowest

range.

(Yellow button) Selects alternate measurement

functions on a rotary switch setting, for example, to

select dc mA, dc A, Hz, temperature (179 only),

capacitance, diode test.

Rotary Switch Positions

Table 3 identifies the switch positions on the Product.

Table 3. Rotary Switch Positions

Switch

Position Measurement Function

AC voltage from 30.0 mV to 1000 V.

Frequency from 2 Hz to 99.99 kHz.

DC voltage 1 mV to 1000 V.

Frequency from 2 Hz to 99.99 kHz.

175, 177, 179

Users Manual

Table 3. Rotary Switch Positions (cont.)

Switch

Position Measurement Function

DC mV 0.1 mV to 600 mV.

Temperature −40 °C to +400 °C.

−40 °F to +752 °F.

Beeper turns on at <25 Ωand turns off at >250 Ω.

Diode test. Displays 0L above 2.4 V.

AC A from 0.300 A to 10 A.

DC A from 0.001 A to 10 A.

>10.00, display flashes.

>20 A, 0L is displayed.

Frequency of ac A 2 Hz to 30 kHz.

Ohms from 0.1 Ωto 50 MΩ.

Farads from 1 nF to 9999 μF.

AC mA from 3.00 mA to 400 mA.

DC mA from 0.01 mA to 400 mA.

Frequency of ac mA 2 Hz to 30 kHz.

Note: AC voltage and current AC-coupled, true-rms, up to 1 kHz.

Display

Table 4 shows the items on the Product display.

Table 4. Display

14 15

aik02f.em

Item Symbol Description

AsContinuity test.

BODiode test.

CKNegative readings.

DYUnsafe voltage. Voltage ≥30 V, or

voltage overload (0L).

True-rms Multimeters

Display

Table 4. Display (cont.)

Item Symbol Description

Display HOLD is enabled. Display

freezes present reading.

In MIN MAX AVG mode, MIN MAX

AVG recording is interrupted.

AutoHOLD is enabled. Display holds

present reading until it detects new

stable input. Then the Product beeps

and displays the new reading.



MAX, MIN,

AVG

MIN MAX AVG enabled.

Maximum, minimum, average or

present reading.

nμF, °F, °C

mVA, Mke,

kHz

Measurement units.

HDC, AC Direct current, alternating current.

IbLow battery. Replace battery.

J610000mV All possible ranges.

KBar graph Analog display.

Table 4. Display (cont.)

Item Symbol Description

Auto Range

Manual Range

The Product selects the range with

the best resolution.

The user selects the range.

M±Bar graph polarity.

N0L The input out of range.

OLEAd

WTest lead alert. Displayed when

the rotary switch is moved to or

from the mA or Aposition.

Table 5 identifies error messages that can show on the display.

Table 5. Error Messages

Error Description

bAtt Replace the battery immediately.

di'C In the capacitance function, too much electrical charge

is present on the capacitor being tested.

EEPr

Err Invalid EEPROM data. Have Product serviced.

CAL

Err Invalid calibration data. Calibrate Product.

0PEn Open thermocouple is detected.

175, 177, 179

Users Manual

Battery Saver (Sleep Mode)

The Product enters the Sleep mode and the display goes blank if

there is no function change or button press for 20 minutes. To

disable the Sleep mode, hold down Bwhile turning the Product

on. The Sleep mode is always disabled in the MIN MAX AVG

mode and the AutoHOLD mode.

MIN MAX AVG Recording Mode

The MIN MAX AVG recording mode captures the minimum and

maximum input values and calculates a running average of all

readings. When a new high or low is detected, the Product beeps.

Note

For dc functions, accuracy is the specified accuracy of the

measurement function

12 counts for changes longer than

350 ms in duration.

For ac functions, accuracy is the specified accuracy of the

measurement function

40 counts for changes longer than

900 ms in duration.

To use MIN MAX AVG recording:

1. Set the desired measurement function and range.

(Autoranging is disabled in the MIN MAX AVG mode.)

2. Press

Mto activate MIN MAX AVG mode.

and MAX come on, and the highest reading detected

since entering MIN MAX AVG shows on the display.

3. To step through the low (MIN), average (AVG), and present

readings, press M.

4. To pause MIN MAX AVG recording without erasing stored

values, press H.

hcomes on.

5. To continue MIN MAX AVG recording, press Hagain.

hturns off.

6. To erase stored readings and exit, press Mfor 1 second or

turn the rotary switch.

True-rms Multimeters

Display HOLD and AutoHOLD Modes

XW Warning

To avoid electric shock, fire, or personal injury, do not

use the Display HOLD or AutoHOLD mode to determine

if a circuit is live. Unstable or noisy readings will not be

captured.

In the Display HOLD mode, the Product holds the reading on the

display.

In the AutoHOLD mode, the Product holds the reading on the

display until it detects a new stable reading. Then the Product

beeps and displays the new reading.

1. Press

Hto activate Display HOLD.

hcomes on.

2. Press

Hagain to activate AutoHOLD.

Ah shows on the display.

3. To continue normal operation at any time, press Hfor

1 second or turn the rotary switch.

Manual Range and Autorange

The Product has both Manual range and Autorange modes.

•In the Autorange mode, the Product selects the range with

the best resolution.

•In the Manual Range mode, override Autorange and select

the range yourself.

When you turn the Product on, it defaults to Autorange and Auto

Range shows.

1. To enter the Manual Range mode, press R.

Manual Range shows.

2. In the Manual Range mode, press Rto increment the

range. After the highest range, the Product wraps to the lowest

range.

Note

You cannot manually change the range in the MIN MAX

AVG, or Display HOLD modes.

If you press Rwhile in MIN MAX AVG, or Display HOLD,

the Product beeps twice, indicating an invalid operation,

and the range does not change.

175, 177, 179

Users Manual

3. To exit Manual Range, press Rfor 1 second or turn the

rotary switch.

The Product returns to Autorange and Auto Range shows.

Power-Up Options

Table 6 shows the Power-Up Options. To select a Power-Up

Option, hold down the button indicated while turning the Product

from OFF to any switch position.

Power-Up Options are cancelled when the Product is turned OFF.

Table 6. Power-Up Options

Button Power-Up Options

AutoHOLD

Kswitch position turns on all LCD segments.

Lswitch position displays the software version

number.

Eswitch position displays the model number.

MDisables beeper. (bEEP)

Enables "Smoothing" mode. ('___)

Dampens display fluctuations of rapidly changing

inputs by digital filtering.

(Yellow button) Disables automatic power-down

(Sleep mode). (PoFF)

Sleep mode is also disabled while the Product is in

a MIN MAX AVG Recording mode, or the

AutoHOLD mode.

SDisables automatic 2-minute backlight timeout.

(LoFF) (177 and 179 Only)

True-rms Multimeters

Basic Measurements

The figures on the following pages show how to make basic

measurements.

XW Warning

To avoid electric shock, fire, or personal injury:

•Connect the common test lead before the live test

lead and remove the live test lead before the

common test lead.

•Disconnect power and discharge all high-voltage

capacitors before you measure resistance,

continuity, capacitance, or a diode junction.

Measure AC and DC Voltage

+__ +_

Volts AC Volts DC Millivolts DC

VVmV

RANGEHOLD MINMAXRANGEHOLD MINMAXRANGEHOLD MINMAX

AIK03F.emf

Measure Resistance

RANGEHOLD MINMAX

AIK04F.emf

Measure Capacitance

RANGEHOLD MINMAX

AIK05F.emf

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