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®
Models 175, 177, 179
True RMS Multimeters
Users Manual
May 2003 (English)
© 2003 Fluke Corporation. All rights reserved. Printed in USA.
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, "life-
time" 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 re-
pair, 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 DAM-
AGES 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 limita-
tion 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
Visit the Fluke website at: www.fluke.com
Register your Meter at: register.fluke.com
2/02
Table of Contents
Title Page
Contacting Fluke ................................................................................................................... 1
"Warning" and "Caution" Statements..................................................................................... 1
Unsafe Voltage...................................................................................................................... 1
Test Lead Alert ...................................................................................................................... 1
Battery Saver ("Sleep Mode")................................................................................................ 2
Terminals .............................................................................................................................. 2
Rotary Switch Positions......................................................................................................... 2
Display .................................................................................................................................. 3
MIN MAX AVG Recording Mode ........................................................................................... 4
Display HOLD and AutoHOLD Modes ................................................................................... 4
YELLOW Button .................................................................................................................... 4
Display Backlight (Model 177 and 179 Only) ......................................................................... 4
Manual Ranging and Autoranging ......................................................................................... 5
Power-Up Options ................................................................................................................. 5
Making Basic Measurements................................................................................................. 6
Measuring AC and DC Voltage......................................................................................... 6
Measuring Resistance ...................................................................................................... 6
Measuring Capacitance.................................................................................................... 6
Testing for Continuity........................................................................................................ 7
Measuring Temperature (Model 179 Only) ....................................................................... 7
Testing Diodes ................................................................................................................. 7
Measuring AC or DC Current ........................................................................................... 8
Understanding AC Zero Input Behavior of True RMS Meters ........................................... 8
Measuring Frequency....................................................................................................... 9
Using the Bar Graph.............................................................................................................. 9
Cleaning ................................................................................................................................ 10
Testing the Fuses.................................................................................................................. 10
Replacing the Battery and Fuses........................................................................................... 10
Specifications ........................................................................................................................ 11
i
XW Warning. Read before using the Meter:
To avoid possible electrical shock or personal injury, follow these guidelines:
Use the Meter only as specified in this manual or the protection provided by the Meter might be impaired.
Do not use the Meter or test leads if they appear damaged, or if the Meter is not operating properly. If in doubt, have the
Meter serviced.
Always use the proper terminals, switch position, and range for measurements.
Verify the Meter's operation by measuring a known voltage.
Do not apply more than the rated voltage, as marked on the Meter, between the terminals or between any terminal and earth
ground.
Use caution with voltages above 30 V ac rms, 42 V ac peak, or 60 V dc. These voltages pose a shock hazard.
Replace the battery as soon as the low battery indicator ( b ) appears.
Disconnect circuit power and discharge all high-voltage capacitors before testing resistance, continuity, diodes, or
capacitance.
Do not use the Meter around explosive gas or vapor.
When using the test leads, keep your fingers behind the finger guards.
Remove test leads from the Meter before opening the Meter case or battery door.
Symbols
B AC (Alternating Current) I Fuse
F DC (Direct Current) Conforms to European Union directives
F DC/AC Canadian Standards Association
B
Earth ground T Double insulated
Important Information; see manual Underwriters Laboratories, Inc.
Meter in accordance with IEC 61010-1. 54CJ
b Battery (Low battery when shown on ; Conforms to relevant Australian standards
display.) N10140
Inspected and licensed by TÜV VDE (Verband Deutscher Electroniker)
(Technischer Überwachungs Verein)
Product Services
ii
Models 175, 177 & 179
True RMS Multimeters
The Fluke Model 175, Model 177, and Model 179 are battery- "Warning" and "Caution" Statements
powered, true-RMS multimeters (hereafter "the Meter") with a
A " XWWarning" identifies hazardous conditions and actions
6000-count, 3 3/4-digit display and a bar graph. This manual
that could cause bodily harm or death.
applies to all three models. All figures show the Model 179.
A "Caution" identifies conditions and actions that could damage
These meters meet CAT III and CAT IV IEC 61010 standards.
the Meter, the equipment under test, or cause permanent loss of
The IEC 61010 safety standard defines four overvoltage
data.
categories (CAT I to IV) based on the magnitude of danger from
transient impulses. CAT III meters are designed to protect against Unsafe Voltage
transients in fixed-equipment installations at the distribution level;
CAT IV meters are designed to protect against transients from the To alert you to the presence of a potentially hazardous voltage,
primary supply level (overhead or underground utility service). when the Meter detects a voltage 30 V or a voltage overload
The Meter measures or tests the following: (OL), the Y symbol is displayed.
AC / DC voltage & current Diodes Test Lead Alert
Resistance Continuity To remind you to check that the test leads are in the correct
Voltage & current frequency Capacitance terminals, LEAd is momentarily displayed when you move the
Temperature (Model 179 only) rotary switch to or from the mA or A position.
XW Warning
Contacting Fluke
Attempting to make a measurement with a test lead in
To contact Fluke, call: an incorrect terminal might blow a fuse, damage the
1-888-993-5853 in USA Meter, and cause serious personal injury.
1-800-363-5853 in Canada
+31 402-678-200 in Europe
+81-3-3434-0181 in Japan
+65-738-5655 in Singapore
+1-425-446-5500 from anywhere in the world
Visit Fluke's web site at: www.fluke.com
Register your Meter at: register.fluke.com
1
Models 175, 177 & 179
Users Manual
Battery Saver ("Sleep Mode") Rotary Switch Positions
The Meter enters the "Sleep mode" and blanks the display if there Switch
is no function change or button press for 20 minutes. To disable Position Measurement Function
the Sleep mode, hold down the YELLOW button while turning the
Meter on. The Sleep mode is always disabled in the MIN MAX K AC voltage from 30.0 mV to 1000 V.
AVG mode and the AutoHOLD mode. Hz Frequency from 2 Hz to 99.99 kHz.
Terminals L DC voltage 1 mV to 1000 V.
.
Hz Frequency from 2 Hz to 99.99 kHz.
1 3
mL DC mV 0.1 mV to 600 mV.
Temperature - 40 °C to + 400 °C
V T - 40 °F to + 752 °F
e Ohms from 0.1 to 50 M.
E Farads from 1 nF to 9999 µF.
FUSED
2 4 R Beeper turns on at <25 and turns off at >250 .
G Diode test. Displays OL above 2.4 V.
FB AC mA from 3.00 mA to 400 mA (600 mA overload
AIK01F.EPS for 2 minutes maximum).
mA
Item Description DC mA from 0.01 mA to 400 mA (600 mA overload
Input terminal for AC and DC milliamp measurements for 2 minutes maximum).
1
to 400 mA (600 mA overload for 2 minutes maximum) Hz Frequency of AC mA 2 Hz to 30 kHz.
and frequency measurements.
Input terminal for AC and DC current measurements to F AC A from 0.50 A to 10 A (20 A overload for 30
2 BA seconds maximum).
10 A (20 A overload for 30 seconds maximum) and
frequency measurements. DC A from 0.01 A to 10 A (20 A overload for 30
Input terminal for voltage, continuity, resistance, diode, seconds maximum)
3
capacitance, frequency, and temperature (Model 179 >10.00 display flashes.
only) measurements. >20 A, OL is displayed.
4 Common (return) terminal for all measurements. Hz Frequency of AC A 2 Hz to 30 kHz.
Note: AC voltage and current AC-coupled, true RMS, up to 1 kHz.
2
Display
Display No. Symbol Meaning
.
7 nµ F, °F, °C Measurement units.
5 6 mVA, Mke, kHz
8 DC, AC Direct current, alternating current.
4
7 9 b Low battery. Replace battery.
3 8 10 610000mV All possible ranges.
2 11 Bar graph Analog display.
7
1
9
12 Auto Range The Meter selects the range with
the best resolution.
13 10 Manual Range The user selects the range.
11
12 14 15 13 ± Bar graph polarity.
0L
O
14
W
AIK02F.EPS The input out of range.
No. Symbol Meaning 15 LEAd Test lead alert. Displayed when
the rotary switch is moved to or
1 s Continuity test. from the mA or A position.
h
2 Diode test.
3 K Negative readings. Error Messages
4
Y Unsafe voltage. Voltage 30 V, or bAtt Replace the battery immediately.
voltage overload (OL)
Ah
5 Display HOLD is enabled. Display diSC In the capacitance function, too much electrical
freezes present reading. charge is present on the capacitor being tested.
In MIN MAX AVG mode, MIN MAX EEPr Invalid EEPROM data. Have Meter serviced.
AVG recording is interrupted. Err
m
AutoHOLD is enabled. Display holds
present reading until it detects new CAL Invalid calibration data. Calibrate Meter.
stable input. Then the Meter beeps Err
and displays new reading.
6 MIN MAX AVG enabled.
MAX , MIN, Maximum, minimum, or average
AVG reading.
3
Models 175, 177 & 179
Users Manual
MIN MAX AVG Recording Mode Display HOLD and AutoHOLD Modes
The MIN MAX AVG recording mode captures the minimum and
maximum input values, and calculates a running average of all
XW Warning
readings. When a new high or low is detected, the Meter beeps. To avoid electric shock, do not use the Display HOLD or
AutoHOLD mode to determine if a circuit is live.
Note Unstable or noisy readings will not be captured.
For DC functions, accuracy is the specified accuracy of the In the Display HOLD mode, the Meter holds the reading on the
measurement function ± 12 counts for changes longer than
hh
display.
275 ms in duration.
A
In the AutoHOLD mode, the Meter holds the reading on the
For AC functions, accuracy is the specified accuracy of the display until it detects a new stable reading. Then the Meter
measurement function ± 40 counts for changes longer than beeps and displays the new reading.
1.2 s in duration. Press HOLD to activate Display HOLD. lights.
To use MIN MAX AVG recording: Press HOLD again to activate AutoHOLD.
Make sure that the Meter is in the desired measurement lights.
m
function and range. (Autoranging is disabled in the MIN MAX Press HOLD again to resume normal operation.
AVG mode.)
To resume normal operation at any time, press HOLD for 1
Press MIN MAX to activate MIN MAX AVG mode. second or turn the rotary switch.
and MAX light, and the highest reading detected
YELLOW Button
h
since entering MIN MAX AVG is displayed.
Press MIN MAX to step through the low (MIN), average Press the YELLOW button to select alternate measurement
functions on a rotary switch setting, e.g., to select DC mA, DC A,
h
(AVG), and present readings.
Hz, temperature (Model 179 only), capacitance, diode test.
To pause MIN MAX AVG recording without erasing stored
values, press HOLD. is displayed. Display Backlight (Model 177 and 179 Only)
To resume MIN MAX AVG recording, press HOLD again.
turns off.
Press S to toggle the backlight on and off. The backlight
automatically turns off after 2 minutes.
To exit and erase stored readings, press MIN MAX for 1
second or turn the rotary switch.
4
Manual Ranging and Autoranging
Manual Ranging and Autoranging Power-Up Options
The Meter has both Manual range and Autorange modes. To select a Power-Up Option, hold down the button indicated
In the Autorange mode, the Meter selects the range with the while turning the Meter from OFF to any switch position.
best resolution. Power-Up Options are cancelled when the Meter is turned OFF.
In the Manual Range mode, you override Autorange and
select the range yourself. Button Power-Up Options
When you turn the Meter on, it defaults to Autorange and Auto
Range is displayed. AutoHOLD Turns on all display segments.
1. To enter the Manual Range mode, press RANGE. H Release HOLD to turn off display; the software
version number is displayed and the Meter
Manual Range is displayed. resumes normal operation.
2. In the Manual Range mode, press RANGE to increment the
range. After the highest range, the Meter wraps to the lowest M Disables beeper.
range.
R Enables "Smoothing" mode.
Note Dampens display fluctuations of rapidly changing
You cannot manually change the range in the MIN MAX inputs by digital filtering.
AVG, Display HOLD, or AutoHOLD modes.
If you press RANGE while in MIN MAX AVG, Display
B Disables automatic power-down ("Sleep mode").
HOLD, or AutoHOLD, the Meter beeps, indicating an (YELLOW) Sleep mode is also disabled while the Meter is in a
invalid operation, and the range does not change. MIN MAX AVG Recording mode, or the AutoHOLD
mode.
3. To exit Manual Range, press RANGE for 1 second or turn the
rotary switch. S Disables automatic 2-minute backlight timeout.
The Meter returns to Autorange and Auto Range is displayed. (Model 177 and 179 Only)
5
Models 175, 177 & 179
Users Manual
Making Basic Measurements Measuring Resistance
The figures on the following pages show how to make basic
measurements.
When connecting the test leads to the circuit or device, connect
the common (COM) test lead before connecting the live lead; HOLD MIN MAX RANGE
when removing the test leads, remove the live lead before
removing the common test lead.
XW
Warning
To avoid electric shock, injury, or damage to the Meter,
disconnect circuit power and discharge all high-voltage
capacitors before testing resistance, continuity, diodes,
or capacitance.
Measuring AC and DC Voltage
Volts AC Volts DC Millivolts DC AIK04F.EPS
Measuring Capacitance
HOLD MIN MAX RANGE HOLD MIN MAX RANGE HOLD MIN MAX RANGE
V mV
V HOLD MIN MAX RANGE
+ _ + _
AIK03F.EPS + _
+
AIK05F.EPS
6
Making Basic Measurements
Testing for Continuity Testing Diodes
Good Diode Good Diode
HOLD MIN MAX RANGE HOLD MIN MAX RANGE
HOLD MIN MAX RANGE HOLD MIN MAX RANGE
+ _ + _
Single Beep
AIK06F.EPS
Forward Bias Reverse Bias
Measuring Temperature (Model 179 Only)
Bad Diode Bad Diode
HOLD MIN MAX RANGE HOLD MIN MAX RANGE
HOLD MIN MAX RANGE
RANGE
Vent CAT
or
80BK1 Type K
Pipe + _ + _
Thermocouple
Probe
and
XWWarning: Do not connect 80BK1 to live circuits.
AIK10F.EPS
Open
Shorted
AIK07F.EPS
7
Models 175, 177 & 179
Users Manual
Measuring AC or DC Current Understanding AC Zero Input Behavior of True RMS Meters
XWWarning Unlike averaging meters, which can accurately measure only pure
sinewaves, True RMS meters accurately measure distorted
To avoid personal injury or damage to the Meter: waveforms. Calculating True RMS converters require a certain
· Never attempt to make an in-circuit current measure- level of input voltage to make a measurement. This is why AC
ment when the open-circuit potential to earth is voltage and current ranges are specified from 5% of range to
> 1000 V. 100% of range. Non-zero digits that are displayed on a True RMS
· Check the Meter's fuses before testing. (See "Testing meter when the test leads are open or are shorted are normal.
the Fuses".) They do not affect the specified AC accuracy above 5% of range.
· Use the proper terminals, switch position, and range Unspecified input levels on the lowest ranges are:
for your measurement. · AC voltage: below 5% of 600 mV AC, or 30 mV AC
· Never place the probes in parallel with a circuit or
component when the leads are plugged into the · AC current: below 5% of 60 mA AC, or 3 mA AC
current terminals.
Turn power OFF, break circuit, insert Meter in series, turn power
on.
DC
HOLD MIN MAX RANGE
mA
+ A
CAT
CAT
+
AIK08F.EPS
8
Using the Bar Graph
Measuring Frequency Using the Bar Graph
XWWarning The bar graph is like the needle on an analog Meter. It has an
overload indicator ( ) to the right and a polarity indicator (±) to the
To avoid electrical shock, disregard the bar graph for
frequencies > 1 kHz. If the frequency of the measured left.
signal is > 1 kHz, the bar graph is unspecified. Because the bar graph updates about 40 times per second, which
The Meter measures the frequency of a signal. The trigger level is is 10 times faster than the digital display, the bar graph is useful
0 V, 0 A AC for all ranges. for making peak and null adjustments and for observing rapidly
changing inputs.
AC/DC Voltage Frequency AC Current Frequency
The bar graph is disabled when measuring capacitance or
temperature. In frequency, the bar graph accurately indicates the
x2 Hz voltage or current up to 1 kHz.
HOLD MIN MAX RANGE
Hz HOLD MIN MAX RANGE
The number of lit segments indicates the measured value and is
relative to the full-scale value of the selected range.
V mA
In the 60 V range, for example (see below), the major divisions on
the scale represent 0, 15, 30, 45, and 60 V. An input of -30 V
V lights the negative sign and the segments up to the middle of the
A
scale.
+
+
AIK09F.EPS
To exit frequency, press YELLOW button or turn the rotary AIK11F.EPS
switch.
In frequency, the bar graph shows the AC/DC voltage or AC
current accurately up to 1 kHz.
Select progressively lower ranges using manual ranging for a
stable reading.
9
Models 175, 177 & 179
Users Manual
Cleaning Replacing the Battery and Fuses
Wipe the case with a damp cloth and mild detergent. Do not use
abrasives or solvents. Dirt or moisture in the terminals can affect
XW Warning
readings. To avoid shock, injury, or damage to the Meter:
· Use ONLY fuses with the amperage, interrupt,
Testing the Fuses voltage, and speed ratings specified.
Warning XW · Replace the battery as soon as the low battery
indicator ( b ) appears.
To avoid electrical shock or injury, remove the test
leads and any input signals before replacing the fuse.
Test fuses as shown below. b
440 mA 11 A
<12 OK <.5 OK
HOLD MIN MAX RANGE
OK OK B1
F1
F2
V
AIK12F.EPS AIK13F.EPS
F1 Fuse, 440 mA, 1000 V, FAST Fluke PN 943121
F2 Fuse, 11 A, 1000 V, FAST Fluke PN 803293
B1 Battery, 9 V Alkaline, Fluke PN 614487
NEDA 1604 / 1604A
10
Specifications
Specifications
Accuracy is specified for 1 yr after calibration, at operating temperatures of 18 °C to 28 °C, with relative humidity at 0 % to 95 %. Accuracy
specifications take the form of:
± ( [ % of Reading ] + [ Counts ] )
Maximum voltage between any terminal and earth ground:
1000 V DC or AC RMS
W
Surge Protection: 8 kV peak per IEC 61010
W
Fuse for mA inputs: 440 mA, 1000 V FAST Fuse
Fuse for A input: 11 A, 1000 V FAST Fuse
Display: Digital: 6000 counts, updates 4/sec
Bar Graph: 33 segments;
Updates 40/sec
Frequency: 10,000 counts
Capacitance: 1,000 counts
Altitude: Operating: 2000 m; Storage: 12,000 m
Temperature: Operating: -10 °C to +50 °C;
Storage: -30 °C to +60 °C
Temperature coefficient: 0.1 X (specified accuracy / °C
(< 18 °C or > 28 °C)
Electromagnetic In an RF field of 3 V/M, accuracy = specified accuracy except in temperature: specified accuracy ± 5 °C (9 °F)
Compatibility
(EN 61326-1:1997):
Relative Humidity: Noncondensing < 0 °C
0 % to 95 % @ 10 °C to 30 °C
0 % to 75 % @ 30 °C to 40 °C;
0 % to 40 % @ 40 °C to 50 °C
Battery Life: Alkaline: 300 hrs typical
Size (H x W x L): 4.3 cm x 9 cm x 18.5 cm
Weight: 420 g
Safety Compliances: ANSI/ISA S82.02.01, CSA C22.2-1010.1, IEC 61010 to 1000 V Overvoltage Category III, 600 V Overvoltage
P;
Category IV
Certifications: CSA, TÜV (EN61010), UL, , (N10140),VDE
11
Models 175, 177 & 179
Users Manual
Accuracy ± ( [ % of Reading ] + [ Counts ] )
1
Function Range Resolution Model 175 Model 177 Model 179
AC Volts 2,3 600.0 mV 0.1 mV 1.0 % + 3 1.0 % + 3 1.0 % + 3
6.000 V 0.001 V (45 Hz to 500 Hz) (45 Hz to 500 Hz) (45 Hz to 500 Hz)
60.00 V 0.01 V
600.0 V 0.1 V
1000 V 1V 2.0 % + 3 2.0 % + 3 2.0 % + 3
(500 Hz to 1 kHz) (500 Hz to 1 kHz) (500 Hz to 1 kHz)
DC mV 600.0 mV 0.1 mV 0.15 % + 2 0.09 % + 2 0.09 % + 2
DC Volts 6.000 V 0.001 V
60.00 V 0.01 V 0.15 % + 2 0.09 % + 2 0.09 % + 2
600.0 V 0.1 V
1000 V 1V 0.15 % + 2 0.15 % + 2 0.15 % + 2
Continuity 600 1 Meter beeps at < 25 , beeper turns off at > 250 ; detects
opens or shorts of 250 µs or longer.
Ohms 600.0 0.1 0.9 % + 2 0.9 % + 2 0.9 % + 2
6.000 k 0.001 k 0.9 % + 1 0.9 % + 1 0.9 % + 1
60.00 k 0.01 k 0.9 % + 1 0.9 % + 1 0.9 % + 1
600.0 k 0.1 k 0.9 % + 1 0.9 % + 1 0.9 % + 1
6.000 M 0.001 M 0.9 % + 1 0.9 % + 1 0.9 % + 1
50.00 M 0.01 M 1.5 % + 3 1.5 % + 3 1.5 % + 3
Diode test 2.400 V 0.001 V 1%+2
Capacitance 1000 nF 1 nF 1.2 % + 2 1.2 % + 2 1.2 % + 2
10.00 µF 0.01 µF 1.2 % + 2 1.2 % + 2 1.2 % + 2
100.0 µF 0.1 µF 1.2 % + 2 1.2 % + 2 1.2 % + 2
9999 µF 4 1 µF 10 % typical 10 % typical 10 % typical
5
AC Amps 60.00 mA 0.01 mA
(True RMS) 400.0 mA 0.1 mA 1.5 % + 3 1.5 % + 3 1.5 % + 3
6.000 A 0.001 A
(45 Hz to 1 kHz) 10.00 A 0.01 A
1. All AC voltage and AC current ranges are specified from 5 % of range to 100 % of range.
2. Crest factor of 3 at full scale up to 500 V, decreasing linearly to crest factor 1.5 at 1000 V.
3. For non-sinusoidal waveforms, add -(2% reading + 2% full scale) typical, for crest factors up to 3.
4. In the 9999 µF range for measurements to 1000 µF, the measurement accuracy is 1.2 % + 2 for all models.
5. Amps input burden voltage (typical): 400 mA input 2 mV/mA, 10 A input 37 mV/A.
12
Specifications
Accuracy ± ( [ % of Reading ] + [ Counts ] )
1
Function Range Resolution Model 175 Model 177 Model 179
4
DC Amps 60.00 mA 0.01 mA
400.0 mA 0.1 mA
1.0 % + 3 1.0 % + 3 1.0 % + 3
6.000 A 0.001 A
10.00 A 0.01 A
Hz 99.99 Hz 0.01 Hz
(AC- or2,DC- coupled,
3
999.9 Hz 0.1 Hz 0.1 % + 1 0.1 % + 1 0.1 % + 1
V or A input ) 9.999 kHz 0.001 kHz
99.99 kHz 0.01 kHz
-40 °C to +400 °C 0.1 °C
5
Temperature 1 % + 10
NA NA
-40 °F to +752 °F 0.1 °F
5
1 % + 18
MIN MAX AVG For DC functions, accuracy is the specified accuracy of the measurement function ± 12 counts for changes longer than
275 ms in duration.
For AC functions, accuracy is the specified accuracy of the measurement function ± 40 counts for changes longer than 1.2 s
in duration.
1. All AC voltage and AC current ranges are specified from 5 % of range to 100 % of range.
2. Frequency is specified from 2 Hz to 99.99 kHz in Volts and from 2 Hz to 30 kHz in Amps.
3. Below 2 Hz, the display shows zero Hz.
4. Amps input burden voltage (typical): 400 mA input 2 mV/A, 10 A input 37 mV/A.
5. Does not include error of the thermocouple probe.
13
Models 175, 177 & 179
Users Manual
Input Impedance Common Mode Rejection Ratio
1
Function Overload Protection (Nominal) (1 k Unbalanced) Normal Mode Rejection
Volts AC 1000 V RMS > 10 M < 100 pF > 60 dB @ DC, 50 Hz or 60 Hz
Volts DC 1000 V RMS > 10 M <100 pF >120 dB @ DC, 50 Hz or 60 Hz > 60 dB @ 50 Hz or 60 Hz
2
mV/T 1000 V RMS > 10 M < 100 pF >120 dB @ DC, 50 Hz or 60 Hz > 60 dB @ 50 Hz or 60 Hz
Open Circuit Test Full Scale Voltage To:
Voltage 600 k 50 M Short Circuit Current
2
Ohms 1000 V RMS < 8.0 V DC < 660 mV DC < 4.6 V DC < 1.1 mA
2
Continuity/Diode 1000 V RMS < 8.0 V DC 2.4 V DC < 1.1 mA
test
7
1. 10 V-Hz maximum.
2. For circuits < 0.3 A short circuit. 660 V for high energy circuits.
Function Overload Protection Overload
mA Fused, 44/100 A, 1000 V FAST Fuse 600 mA overload for 2 minutes maximum
A Fused, 11 A, 1000 V FAST Fuse 20 A overload for 30 seconds maximum
14