FLUKE 175 True-Rms Multimeters Owner’s Manual

: June 7, 2024
: FLUKE

Table of Contents

FLUKE 175 True-Rms Multimeters
Product Information
FAQ
Introduction
Contact Fluke
Maintenance
Performance Tests
Calibration Adjustment
Calibration Adjustment Procedure
User-Replaceable Parts and Accessories
Lifetime Limited Warranty
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

FLUKE 175 True-Rms Multimeters

Specifications:

Product Name: 175, 177, 179 True-rms Multimeters
Calibration Information

Product Information

The 175, 177, 179 True-rms Multimeters are precision instruments designed for accurate measurement of electrical parameters. These multimeters provide true RMS readings for reliable results.

Usage Instructions:

Calibration Information:

Warning: To avoid electric shock or injury, only qualified personnel should perform performance tests or calibration adjustments. Refer to the User Manual for complete operating instructions.

Safety Information:

Always follow the safety guidelines provided to prevent personal injury or damage to the product. Refer to the Safety Information document that comes with the product and online resources for detailed safety instructions.

Test Lead Alert:

Always ensure test leads are correctly placed. The display will show “LEAd” when switching between mA or A positions as a reminder. Incorrect placement can lead to fuse damage and personal injury.

Testing the Fuses:

Set the Rotary Switch to ‘e’.
Insert the test lead into the appropriate terminal and touch the probe to test the fuse.
If the display shows a resistance value within the specified range, the fuse is good.
If the display shows ‘0L’, replace the fuse and retest.
If any other value is displayed, seek service assistance.

FAQ

Q: How do I register my product?

A: Visit Fluke’s website at www.fluke.com and follow the instructions to register your product.

Q: What should I do if the display shows ‘0L’ during testing?

A: Replace the fuse and perform the test again. If the issue persists, contact Fluke for servicing.

Introduction

Warning
To avoid electric shock or injury, do not perform the performance tests or calibration adjustment procedures unless qualified to do so.
The information provided in this document is for the use of qualified personnel only.

The 175, 177, 179 Calibration Information provides the information necessary to adjust and verify the performance of the 175, 177, and 179 True-rms Multimeters (hereafter known as the Product).
See the 175, 177, 179 Users Manual for complete operating instructions.

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
fluke-info@fluke.com.

PN 1600476 (English)
March 2001 Rev. 7, 3/23
©2001-2023 Fluke Corporation. All rights reserved. Specifications are subject to change without notice.
All product names are trademarks of their respective companies.

Safety Information
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.
General Safety Information is located 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.

Specifications
Safety Specifications are located in the Safety Specifications section of the Safety Information manual. Complete specifications are in the Users Manual at www.fluke.com.

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 A position.

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.

Test the Fuses
To test the fuses (see Figure 1):

Set the Rotary Switch to e.
Plug a test lead into the terminal and touch the probe to the 400 mA (to test the 440 mA Fuse) or 10 A terminal (to test the 11 A Fuse).
- If the display shows a resistance value in the range shown in Figure 1 fuse is good.
- If the display reads 0L, replace the fuse and test again.
- If the display shows any other value, have the Product serviced. See Contact Fluke earlier in this manual.

Replace the Fuses

Warning
To prevent possible electrical shock, fire, personal injury, or damage to the Product:

Remove the test leads and any input signals before replacing the fuse.
Use ONLY fuses with the amperage, interrupt, voltage, and speed ratings specified.

To replace the Fuses (see Figure 2):

Turn the Rotary Switch to OFF.
Disconnect the test leads and/or any connectors from the terminals.
Remove the four screws from the Case Bottom and separate the Case Top from the Case Bottom.
Remove the fuses by gently prying one end loose, then slide the fuse out of its bracket, and replace with a properly rated good fuse.
Rejoin the Case Bottom and Case Top, and reinstall the four screws.

Replace the Battery

Warning
To prevent possible electrical shock, fire, personal injury, or damage to the Product, replace the battery as soon as the low battery indicator appears.

To replace the Battery (see Figure 2):

Turn the Rotary Switch to OFF and remove the test leads from the terminals.
Remove the two screws from the Battery Compartment Door, and remove it from the Case Bottom.
Remove the Battery from the battery connector.
Replace the Battery with a new 9 V battery (NEDA A1604, 6F22, or 006P).
Reattach the Battery Compartment Door to the Case Bottom and reinstall the two screws.

Maintenance

Warning
To prevent possible electrical shock, fire, personal injury, or damage to the Product:

Repair the Product before use if the battery leaks.
Do not operate the Product with covers removed or the case open. Hazardous voltage exposure is possible.
Remove the input signals before you clean the Product.
Use only specified replacement parts.
Have an approved technician repair the Product.
Use only specified replacement fuses.
Replace a blown fuse with exact replacement only for continued protection against arc flash.

Clean the Product

Warning

To avoid electrical shock:

Remove test leads and any input signals before cleaning.
Do not reinstall the pca until it is completely dry.
Know that dirt or moisture in the terminals can affect readings.

Caution

To avoid damaging the Product:

Do not use aromatic hydrocarbons or chlorinated solvents for cleaning. These solutions will react with the plastics used in the instruments.
Do not use detergents of any kind for cleaning the pca.

Clean the instrument case with a damp cloth and mild detergent.
The pca may be washed with isopropyl alcohol or hot deionized water and a soft brush. Remove excess cleaning material with clean dry air at low pressure, then dry the pca at 50 °C.

Replace the LCD

Caution
To prevent contamination, do not handle the conductive edges of the LCD or the LCD Elastomeric Connectors. If the edges are contaminated, clean them with alcohol. Allow the alcohol to dry before reassembling.

To remove and replace the LCD, perform the following procedure (see Figure 3):

Turn the Rotary Switch to OFF and remove the test leads from the Product terminals.
Remove the four screws from the Case Bottom, and separate the Case Top from the Case Bottom.
The circuit board remains attached to the Case Bottom.
Remove battery compartment door and disconnect the battery from the battery connector.
Remove the PCA Screw located under the 440 mA Fuse, and lift the pca out of the Case Bottom. The beeper is loose in the bottom case. Exercise caution not to damage it.
Loosen the 4 screws on the back of the pca. This will facilitate reinstalling the LCD.
Insert a small, flat-head screwdriver under the LCD Mask edge and gently pry the LCD Mask from the snaps.
Caution
Take care to not break the LCD with the screwdriver.
Lift out the LCD.
Make sure that all connector contact points are clean. Refer to Clean the Product for more information.
Install a new LCD, taking care that it is correctly oriented.
Reattach the LCD Mask to the LCD assembly by snapping the LCD Mask into place.
Tighten the 4 screws on the back of the pca.
Lay the pca back into the Case Bottom, and screw it down.
Reinsert the 440 mA Fuse.
Reinstall the Battery.
Rejoin the Case Bottom, Case Top, battery compartment door and reinstall the four case screws.

Performance Tests

Warning
To avoid electric shock, do not perform the performance test procedures unless the Product is fully assembled.

The following performance tests verify the complete operation of the Product and check the accuracy of each Product function against its specifications. If the Product fails any part of the test, calibration adjustment and/or repair is indicated.
In the performance tests, the Product is referred to as the device under test (DUT).

Required Equipment
A Fluke 5500A Multi-Product Calibrator (or equivalent) is required for the performance test procedures in this document.
If an equivalent calibrator is used, it must meet the accuracy specifications shown in Calibrator Specifications.

Table 1. Calibrator Specifications

Recommended Equipment	Measurement Function	Accuracy

5500A Multi-Product Calibrator (or equivalent)

19 M W ±0.4 %

Prepare for the Performance Test

Warning
To avoid possible electric shock or personal injury:

Do not perform the following procedures unless qualified to do so. Some procedures involve the use of high voltages.
Before handling the test connections and in between tests, make sure the calibrator is in standby mode (STBY).

To prepare for the performance test:

Make sure that you have the required equipment (see Calibrator Specifications).
Warm up the calibrator as required by its specifications.
Allow the temperature of the DUT to stabilize at room temperature (23 °C ± 5 °C [73 °F ± 9 °F]).
Check the fuses and Battery, and replace them if necessary. Refer to Test the Fuses,Test the Fuses, Replace the Fuses, and Replace the Battery.

Performance Tests

Note
When calibrating or measuring AC current, avoid the potential for errors from coupled noise, by either:

Shorting the to the COM input.
or
Having NO connection to the input.

Set the DUT Rotary Switch to the position called for in Table 2 (175) or Table 3 (177/179), and for all measurements other than current (amps), connect the calibrator to the and COM input terminals.
If testing the milliamps function, connect the calibrator to the 400 mA and COM input terminals on the Product.
If testing the amps function, connect the calibrator to the 10A and COM input terminals on the Product.
Apply the indicated calibrator output voltages to the DUT for each test (see Table 2 or Table 3).
Verify that the DUT displays a reading that is within the limits shown in the Product Response column.

Table 2. Performance Tests 175

Test (Switch Position)	5500 Output	Product Response
Lower Limit	Upper Limit

AC Volts

AC Volts Frequency [1]

| 1 V 45 Hz| 44.94 Hz| 45.06 Hz
1 V 900 Hz| 899 Hz| 901 Hz
1 V 9 kHz| 8.99 kHz| 9.01 kHz
5 V 50 kHz| 49.94 kHz| 50.06 kHz

DC Volts

| 5 V| 4.990 V dc| 5.010 V dc
50 V| 49.90 V dc| 50.1 V dc
300 V| 299.3 V dc| 300.7 V dc
1000 V| 996 V dc| 1004 V dc
-1000 V| -1004 V dc| -996 V dc
Hz

DC Volts Frequency [1]

| 3 V 45 Hz| 44.94 Hz| 45.06 Hz
30 V 50 kHz| 49.94 kHz| 50.06 kHz

Table 2. Performance Tests 175 (cont.)

Table 3. Performance Tests 177/179

Table 3. Performance Tests

Calibration Adjustment

Perform the calibration adjustment procedures if the Product fails the performance test.
The Product buttons behave as follows when the calibration mode is enabled:

Press and hold to test the present function. This measurement is uncalibrated and may be inaccurate. This is normal.
Press and hold to display the required input.
Press to skip the present calibration step without accepting the input signal.
Note
If a calibration step is skipped, the remaining calibration procedure may be invalidated.
Note
This feature is not available for units with serial numbers 83911001 to 83911240 and 84060001 and above.
(YELLOW button) Press to store the calibration value and advance to the next step. This button is also used to exit calibration mode after the calibration adjustment sequence is complete.

Calibration Adjustment Procedure

Use the following steps to adjust the Product’s calibration:
For Products with a serial number of 84060000 and below, switch the Product to volts AC (C). For Products with a serial number of 83911001 to 83911240 and 84060001 and above, switch the Product to DC.

Turn the Product over and find the Calibration Seal located near the top of the Product (see Table 4).
With a small probe, break the Calibration Seal and press the Calibration Button for 1 second. The Product will beep and change to the calibration mode. The display reads C-01, designating the first calibration step. The Product remains in calibration mode until the Rotary Function Switch is turned to OFF.
Proceed through the calibration steps by entering the input value listed in the table for each step.
Note
When calibrating or measuring AC current, avoid the potential for errors from coupled noise, by either:
Shorting the to the COM input or
Having NO connection to the input
Note
Press and wait until the step number advances before changing the calibrator source or turning the Rotary Function Knob.
After each input value is applied, press to accept the value and proceed to the next step ( and so forth).
When the last step in a function is reached, turn the Rotary Function Knob to the next required function. The Product will not allow a step to be completed if the Rotary Function Knob is turned to the wrong function.

Note
If the calibration adjustment procedure is not completed correctly, the Product will not operate correctly. When calibration adjustment is not performed correctly, the Product displays the messages CAL and Err and the Product must be recalibrated.

The Product is damaged and requires service if:

messages continue to appear after a proper recalibration.
messages are alternating on the display.
message appears on the display.

Table 4. Calibration Steps

User-Replaceable Parts and Accessories

User-replaceable parts and accessories are shown in Table 5 and Figure 5.

Table 5. User-Replaceable Parts and Accessories

Figure 5. User-Replaceable Parts and Accessories

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
P.O. Box 9090 Everett, WA 98206-9090 U.S.A.

Fluke Europe B.V. P.O. Box 1186 5602 BD Eindhoven The Netherlands