USER MANUAL FLIR CM72 and CM74 CLAMP METERS CM72 600A True RMS AC Clamp Meter CM74 600A True RMS AC/DC Clamp Meter
Table of Contents 1. DISCLAIMERS 4 1.1 Copyright 4 1.2 Quality Assurance 4 1.3 Documentation 4 1.4 Disposal of Electronic Waste 4 2. SAFETY 5 3. INTRODUCTION 7 3.1 Key Features 7 4. METER DESCRIPTION 8 4.1 Meter Parts 8 4.2 Function Switch 9 4.3 Function Buttons 9 4.4 Display Icons and Indicators 5. 10 OPERATION 12 5.1 Powering the Meter 12 5.1.1 Auto Power Off 12 5.2 Auto/Manual Range Mode 12 5.3 HOLD Mode 12 5.4 Voltage and Current Measurements 13 5.4.
6. 7. 5.4.4.5 VFD Mode (low pass filter) CM74 only 16 5.4.4.6 Flex Clamp Adaptor Use 17 5.5 Resistance Measurements 18 5.6 Continuity Test 18 5.7 Capacitance Measurements 19 5.8 Diode Test 20 MAINTENANCE 21 6.1 Cleaning and Storage 21 6.2 Battery Replacement 21 SPECIFICATIONS 22 7.1 General specifications 22 7.2 Electrical specifications 23 8. TECHNICAL SUPPORT 28 9. WARRANTIES 28 9.
1. Disclaimers 1.1 Copyright © 2015, FLIR Systems, Inc., All rights reserved worldwide. No parts of the software including source code may be reproduced, transmitted, transcribed or translated into any language or computer language in any form or by any means, electronic, magnetic, optical, manual or otherwise, without the prior written permission of FLIR Systems.
2. Safety Safety Notes Before operating the device, you must read, understand, and follow all instructions, dangers, warnings, cautions, and notes. FLIR Systems reserves the right to discontinue models, parts or accessories, and other items, or to change specifications at any time without prior notice. Remove the batteries if the device is not used for an extended period of time. Warning Statements Do not operate the device if you do not have the correct knowledge.
Cautions Do not use the device for a procedure that it is not intended for. This can cause damage to the protection. This symbol, adjacent to another symbol or terminal, indicates that the user must refer to the manual for further information. This symbol, adjacent to a terminal, indicates that, under normal use, hazardous voltages may be present. Double insulation.
3. Introduction Thank you for selecting the FLIR CM72_CM74 Clamp Meter. The CM72 is a True RMS 600A AC Clamp Meter and the CM74 is a True RMS 600A AC/DC clamp meter with integrated VFD Mode, Inrush Current capture. Both meters have a Lo Z mode for eliminating ‘ghost’ voltages. This device is shipped fully tested and calibrated and, with proper use, will provide years of reliable service. 3.1 Key Features 6000‐count digital display Large‐scale 2.
4. Meter Description 4.1 Meter Parts Fig 4‐1 Front View 1. Jaw opening trigger 2. Hz‐MODE button 3. Backlight/Work light button (CM74); Backlight button only (CM72) 4. Function switch 5. COM (negative ‐) Probe Input jack 6. Positive (+) Probe Input jack 7. DCA Zero and Inrush button (CM74 only) Work light button (CM72) 8. MIN/MAX HOLD button 9. AUTO‐RANGE Button 11 1 10 2 9 8 7 3 4 10. LCD Display 11. Clamp jaw 5 Fig 4‐2 Rear View 1. Work light 2. Tripod mount 3.
4.2 Function Switch Select this position when connecting a FLIR Flex Clamp Adaptor. Select this position to measure in the low impedance mode. Select this position to switch the meter OFF (full power saving mode). Select this position to measure AC/DC Voltage through the probe inputs. The meter can measure resistance and continuity through the probe inputs. The type of measurement is selected by the MODE button. The meter can measure capacitance and diode through the probe inputs.
4.4 Display Icons and Indicators Fig 4‐3 Display Icons Refer to Fig. 4-3 above for the display icon descriptions below: Indicates that the meter is displaying maximum reading values. Indicates that the meter is displaying minimum reading values. Indicates that the meter is in Auto range mode. Indicates that the meter is in Hold mode. Indicates the battery voltage status. Indicates that the auto power off function is enabled. Indicates that the measured voltage is greater than 30 V DC or AC RMS.
Unit of measure for current (Amps or Amperes). Volt. Unit of measure for Voltage. Farad. Unit of measure for Capacitance. Hertz. Unit of measure for Frequency. 103 (kilo) 10‐3 (milli) 10‐6 (micro) VFD mode icon (CM74 only). DC Zero mode icon (CM74 only). Inrush current mode icon (CM74 only). Flex Clamp Adaptor (FLIR TA72_TA74) icon. 100mV/Ampere Clamp Adaptor icon. Lo Z mode icon. 4.4.1 Out‐of‐range Warning If the input is out‐of‐range, OL is displayed.
5. Operation Note: Before operating the device, you must read, understand, and follow all instructions, dangers, warnings, cautions, and notes. Note: When the meter is not in use, the function switch should be set to the OFF position. Note: When connecting the probe leads to the device under test, connect the negative lead before connecting the positive lead. When removing the probe leads, remove the positive lead before removing the negative lead. 5.1 Powering the Meter 1.
5.4 Voltage and Current Measurements Note: If the measured voltage is greater than 30 V DC or AC RMS, the indicator is displayed. 5.4.1 Basic Voltage Measurements 1. 2. 3. 4. 5. 6. Set the function switch to the V position. To manually select AC or DC, press the MODE button. To manually select the measurement range (scale), press the RANGE button repeatedly. Refer to section 5.2 Auto/Manual range mode.
5.4.3 Basic Current Measurements WARNING Do not measure the current on a circuit when the voltage increases to more than 600V (CM72) or 1000V (CM74). This can cause damage to the instrument and can cause injury to persons. When measuring current using the clamp jaws, only one conductor should be enclosed by the jaws—refer to Figure 5.2. Figure 5.2 Correct and incorrect setup 1. 2. 3. 4. 5. 6. Ensure that the probe leads are disconnected from the meter. Set the function switch to the A position.
5.4.4 Extended Functionality Modes In addition to the basic measurements that the CM72 and CM74 can perform, a variety of extended functions are included. Refer to the following sections for details. 5.4.4.1 Inrush Current Mode (CM74 only) In Inrush current mode, the meter displays the highest AC current reading in the first 100ms period after the trigger point (current detection threshold) is reached, see Fig. 5.3 below. The current detection threshold is 0.5A for the 60.00A range and 5.0A for the 600.
5.4.4.2 DCA Zero Mode (CM74 only) The DC zero feature removes offset values and improves the accuracy for DC current measurements. 1. Ensure that there is no conductor in the clamp jaws. 2. Press the DCA Zero button to enable DC Zero. The display will zero. 5.4.4.3 Frequency Mode In Frequency mode, the meter measures and displays the frequency. Frequency mode is available when measuring AC current or voltage.
5.4.4.6 Flex Clamp Adaptor Use A FLIR Clamp Adaptor (Models TA72 and TA74) can be connected to the CM72 or CM74 to display current measurements made by the FLEX Clamp Adaptor. 1. Turn the function dial to the 2. Connect the Flex Clamp as shown. position. 3. Set the Range of the Flex Clamp Adaptor to match the range of the CM174. 4. Operate the Flex Clamp per instructions provided with the Flex Clamp meter. 5. Read the current measured by the Flex Clamp on the CM72 or CM74 LCD. Figure 5.
5.5 Resistance Measurements Warning: Do not perform resistance tests before removing the power from resistors and other devices under test during a measurement. Injury to persons can occur. 1. 2. 3. 4. 5. Set the function switch to the position. Use the MODE button to select the resistance mode (continuity symbol should be OFF). Insert the black probe lead into the negative COM terminal and the red probe lead into the positive Ω terminal.
5.7 Capacitance Measurements Warning: Do not perform capacitance tests before removing the power to the capacitor or to other devices under test during a measurement. Injury to persons can occur. 1. 2. 3. 4. 5. Set the function switch to the position. Use the MODE button to select capacitance function (capacitor symbol must be displayed). Insert the black probe lead into the negative COM terminal and the red probe lead into the positive terminal. Touch the tips of the probe across the part under test.
5.8 Diode Test Warning: Do not perform diode tests before removing the power to the diode or other devices under test during a measurement. Injury to persons can occur. position. 1. Set the function switch to the diode 2. Insert the black probe lead into the negative COM terminal and the red probe lead into the positive Ω terminal. 3. Use the MODE button to select the diode test function. The diode indicator displayed. 4.
6. Maintenance 6.1 Cleaning and Storage Clean the meter with a damp cloth and mild detergent; do not use abrasives or solvents. If the meter is not to be used for an extended period, remove the batteries and store them separately. 6.2 Battery Replacement 1. 2. 3. 4. To avoid electrical shock, disconnect the meter if connected to a circuit, remove the probe leads from the terminals, and set the function switch to the OFF position before attempting to replace the batteries.
7. Specifications 7.1 General specifications Display counts: Measuring rate: Over‐range indication: Auto power off: Low battery indicator: 0~6000 3 times per second OL or –OL. 10 minutes (can be disabled) is displayed. Replace battery when indicator appears. Power requirement: Battery life: 4 × 1.5 V AAA alkaline batteries. Approx. 200 hours for CM72; 100 hours for CM74 (with alkaline batteries and backlight/work light off) 1 year calibration cycle.
7.2 Electrical specifications Accuracy is ± (% reading + number of digits (dgt)) at 73.4 °F ±9 °F (23°C ±5 °C), <80% RH. Table 7.1 Voltage (TRMS) Function Range Accuracy (of reading) 60.00 V DCV 600.0 V ± (1.0% + 5 dgt) 1000 V (CM74) 60.00 V ACV 600.0 V (CM72) ± (1.0% + 5 dgt) 45~400 Hz 1000 V (CM74) 60.00 V ACV VFD (CM74 only) ± (1% + 5 dgt) 45~65 Hz ± (5% + 5 dgt) 65~400Hz 600.0 V 1000 V 60.0V AC/DC Lo Z (Low Impedance) 600.0V AC/DC (CM72) AC: ± (1.0% + 5 dgt) 45~400 Hz DC: ± (1.
Table 7.2 Current (TRMS) Function Range Accuracy 60.00 A DCA (CM74 only) ± (2% + 5 dgt) 600.0 A 60.00 A ± (2% + 5dgt) 45~65Hz ± (2% + 5dgt) 65~400Hz for CM74 600.0 A ACA ± (2% + 5dgt) 45~65Hz ± (3% + 5dgt) 65~400Hz for CM72 ACA VFD (CM74 only) 60.00 A ± (2% + 5 dgt) 45~65Hz ± (6% + 5 dgt) 65~400Hz 600.0 A Notes: CM72: No VFD Mode and ACA Only CM74: Integrated VFD Mode always ON in ACA MODE Overload protection: 600A (rms) Position Error: ±1% of reading for CM74 (CM72 not specified).
Table 7.3 Frequency Function Accuracy Range 600.0 Hz Frequency ± (0.1% + 2 dgt) 6.000 kHz 60.00 kHz Notes: These frequency specifications also apply to ‘Lo Z’ Frequency measurements Overload protection: CM72: 600Vrms and 600 A (rms); CM74: 1000Vrms and 600 A (rms) Trigger Sensitivity: >5Vrms for ACV 10Hz~10kHz >15Vrms for ACV 10kHz~60kHz range >4Arms for ACA 10Hz~10kHz >8Arms for ACA 1kHz~10kHz (CM74 only) Reading will be 0.0 for signals below 10.0 Hz. Table 7.
Table 7.5 Resistance and continuity and diode Function Range Accuracy 600.0 Ω (CM74 only) Resistance ±(1.0% + 5 dgt) 6000 Ω (6.000kΩ for CM74) Continuity 600.0 Ω ±(1.0% + 5 dgt) Diode 1.5V ±(1.5% + 5 dgt) CM72 Overload protection: 600 V (rms). CM74 Overload protection: 1000 V (rms). Maximum test current: Approx. 0.1 mA. Maximum open circuit voltage for Ω: Approx. 1.8 V. Maximum open circuit voltage for diode: Approx. 1.8 V. Continuity threshold: < 30 Ω beeper on; > 150 Ω beeper off.
Table 7.7 Flex Clamp Adaptor Function Function Range Accuracy 30.00 A Flex (ACA) 300.0 A ±(1% + 5 dgt) 45 ~ 400Hz 3000 A LCD displays ‘0’ counts when the reading is < 10 counts Additional accuracy for the Flex function is listed in the FLIR clamp adaptor User Manuals (Models TA72_TA74). Table 7.8 Flex Clamp Adaptor Function (Frequency) Function Range Accuracy 600.0 Hz Frequency (Flex) 6.000 kHz ±(0.1% + 2 dgt) 10.00 kHz Sensitivity: >4A (rms) for ACA 10Hz ~ 10kHz.
8. Technical Support Main Website http://www.flir.com/test Technical Support Website http://support.flir.com Technical support Email TMSupport@flir.com Service/Repair Support Email Repair@flir.com Support Telephone number +1 855‐499‐3662 option 3 (toll‐free) 9. Warranties 9.1 FLIR Global Limited Lifetime Warranty A qualifying FLIR Test and Measurement product (the “Product”) purchased either directly from FLIR Commercial Systems Inc.
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