General CM660, User Manual

Page 1: ...RUGGED AUTO RANGING TRUE RMS AC DC CLAMP METERS USER S MANUAL CM660 0 TO 600A MAX CM700 0 TO 1000A MAX Please read this manual carefully and thoroughly before using this product ...

Page 2: ...to Power Off APO 12 13 Using the Analog Bar Graph 13 Turning on the Backlight 13 14 Measuring AC or DC Current 14 16 Measuring AC Inrush Current 15 Measuring Microamp Currents 15 16 Measuring AC or DC Voltage 16 19 Using the Non contact Voltage Detector 16 19 Measuring Resistance 20 Checking for Continuity 20 21 Checking the Integrity of a Diode 21 Measuring Capacitance 22 Measuring Frequency and ...

Page 3: ...he CM660 and CM700 involves their current measurement range and resolution Where the CM660 has a 0 to 600A measurement range and a maximum current resolution of 0 01A the CM700 has a 0 to 1000A measurement range and a maximum resolution of 0 1A Both clamp meters are easy to use and ruggedly built Each meets the ETL CAT III 600V CAT II 1000V safety standard KEY FEATURES 16 functions 49 ranges Measu...

Page 4: ...ete from height of 5 ft 1 6m 20 minute Auto Power Off APO function can be disabled ETL certified CAT III 600V CAT II 1000V 3 year limited warranty WHAT S IN THE BLISTER PACK The meter is supplied in a blister pack with a cavity in the rear for a soft black nylon carrying pouch Inside the pouch are a set of double insulated test leads with screw on alligator clips a K type stem thermocouple probe a...

Page 5: ... LED work light 4 Rotary function switch 5 Multi function buttons ZERO REL Used to 1 Reset DC current measurement baseline to 0A 2 Enter relative measurement mode in which main readout shows difference between real time reading and stored reading shown on secondary readout 3 Disable meter s Auto Power Off function AUTO 1 2 3 4 7 8 6 5 9 ...

Page 6: ... on secondary readout Pressed twice switches to display minimum value recorded during current measurement session on secondary readout Pressed a third time exits Max Min mode HOLD Pressed once holds measured value s freezes main and secondary readouts Pressed again releases both readouts Pressed briefly enters manual ranging mode in broadest range Each subsequent button press switches to next narr...

Page 7: ...aged Look for cracks or missing plastic Pay particular attention to the insulation around the connectors WARNING Inspect the test leads for damaged insulation or exposed metal Check the test leads for continuity Replace damaged test leads before using the meter Verify the meter s operation by measuring a known voltage Do not use the meter if it operates abnormally Protection may be impaired When i...

Page 8: ...ger guards Do not touch the metal probes of the test leads when making a measurement When making connections connect the black test lead before connecting the red test lead when disconnecting disconnect the red test lead before disconnecting the black test lead Disconnect circuit power and discharge all high voltage capacitors before measuring testing resistance continuity diodes or capacitance Fo...

Page 9: ...o electric shock and personal injury Remove the test leads from the meter before opening the meter case or battery compartment Electrical Symbols Used On the Meter and In This Manual Symbol Description Symbol Description AC Alternating Fuse Current DC Double Direct Current Insulated Caution risk of Risk of danger electric shock Important Hazardous information voltage Refer to the manual Battery Lo...

Page 10: ... the single screw securing the battery compartment cover Be careful not to lose the small screw Put the screw and the cover to the side Install the three supplied AAA batteries in the battery compartment Use the polarity marks stenciled inside the compartment as a guide Replace the battery compartment cover and secure it with the Phillips head screw For measurements on circuits connected directly ...

Page 11: ... to 27 for a list of the measurement ranges available for each parameter Once the meter is in manual ranging mode each subsequent press of the button will narrow the full scale range by an order of magnitude a factor of 10 For example pressing the button with the meter operating in the 0 to 600애F full scale manual range will narrow the full scale range to 0 to 60애F and improve measurement resoluti...

Page 12: ...ge in effect at that moment Making Relative Measurements Pressing the ZERO REL button during measurement of a current voltage resistance or capacitance freezes the value being measured at that moment on the secondary readout The term REL will appear on the top line of the LCD to indicate operation in this special mode In REL mode the primary readout will show the difference between ongoing measure...

Page 13: ...ed on until its batteries discharge typically several days later Using the Analog Bar Graph The bar graph at the bottom of the LCD see below provides an analog representation of every measurement shown in digital form on the primary readout above it The key feature of the bar graph is its fast response time It can reflect a change in a measured value 10 times more quickly than the digital readout ...

Page 14: ...t the DC current measurement baseline to 0A 2 Squeezing the clamp jaw release to open the jaw place it around the conductor whose current you wish to measure Be sure to enclose only one conductor see figure below Enclosing both conductors of a pair will produce a reading of 0 Notes Clamp the jaw around one conductor only Close the jaw completely Center the wire in the jaw for highest accuracy When...

Page 15: ...er ACL10 in the SEARCH box Measuring AC Inrush Current To measure the inrush current of a motor during startup press the FUNC INRUSH button with the rotary function switch in the position The term INR will appear on the top line of the LCD and the primary readout will show the motor s surge current to a maximum of 600A for the CM660 and 1000A for the CM700 For this application the current is measu...

Page 16: ...sure AC voltage To measure DC voltage press the FUNC INRUSH button to change the icon at the lower left of the LCD from to 2 Plug the red and black test leads into the red and black jacks at the bottom front of the meter 3 Touch or clip the black test lead to the lower potential point of the circuit under test and the red test lead to the higher potential point 4 Read the measured voltage on the d...

Page 17: ...has four sensitivity levels They were chosen to optimize voltage detection over four practical ranges 12 to 25VAC 70 to 125VAC 150 to 240VAC and 250 to 600VAC The ability to detect the presence of 12VAC in noncontact fashion comes in very handy during troubleshooting of branch circuits and process plant and industrial automation systems and equipment such as gas and water valves fans lights relays...

Page 18: ...l produce a field strong enough to activate the NCV s alarms In this way the adjustable sensitivity of the CM660 700 s NCV detector takes the guesswork out of identifying the hot wire of a bundle By default powering on the CM660 700 enables the NCV function indicated by the term NCV on the left side of the LCD and sets it to a sensitivity of 3 At this level the corresponding voltage detection rang...

Page 19: ...on and even after a battery replacement Warning The NCV detector in the CM660 700 is designed to indicate the presence of AC voltage with an amplitude between 12VAC and 600VAC Accordingly do not assume that the absence of a positive indication means that the circuit under test is de energized not hot Although they can cause shock and or serious personal injury voltages below 12V may not be detecte...

Page 20: ...st leads into the red and black jacks at the bottom front of the meter 3 Measure the resistance by touching or clipping the tips of the leads to the desired test points of the circuit or to the terminals of a component as shown below 4 Read the measured resistance on the display If the measured resistance value is greater than 60MΩ O L will appear on the primary readout The meter will take a few s...

Page 21: ... diode check function If test leads are not plugged into the meter s front panel jacks the primary readout will show O L with the icon of a diode above it 2 Plug the red and black test leads into the red and black jacks at the bottom front of the meter 3 Touch or clip the red test lead to the anode positive terminal of the diode to be tested and the black test lead to its cathode negative terminal...

Page 22: ... 5 Plug the red and black test leads into the red and black jacks at the bottom front of the meter 6 Touch or clip the test leads to the terminals of the capacitor 7 Read the measured capacitance on the display MEASURING FREQUENCY AND DUTY CYCLE Frequency measurements can be made with the rotary function switch in the or Hz position The most accurate measurements over the widest range are made wit...

Page 23: ...eads In both cases The measured frequency is displayed on the secondary readout in the upper right corner of the LCD Measurement accuracy is limited to 1 5 of the reading 3 digits Measurement range is limited to 10Hz to 1kHz With the rotary function switch in the position the meter can measure the frequency of AC currents with amplitudes up to 1ARMS With the switch in the position the meter can me...

Page 24: ...y DC current Measurement ranges Measurement accuracy AC DC microamp current Measurement ranges True RMS Measurement accuracy Resistance Measurement ranges Measurement accuracy Frequency through clamp jaw Measurement ranges Measurement accuracy Frequency in mode Measurement ranges Measurement accuracy 3 Plug the included K type thermocouple or a different K type thermocouple into the adapter Make s...

Page 25: ...MΩ 0 8 of reading 3 digits 1MΩ 1 2 of reading 3 digits 1MΩ 10Hz to 60Hz 600Hz 6kHz for inputs 1AACRMS 1 5 of reading 5 digits 10Hz to 60Hz 600Hz 6kHz 60kHz for inputs 20mAACRMS 1 5 of reading 5 digits 4 To measure a surface temperature firmly attach the tip or bead of the thermocouple to the surface To measure the temperature of a liquid or gas including ambient air make sure that the tip of the t...

Page 26: ...fety rating Clamp jaw opening Display No of digits Maximum count Auto power off trigger Operating temperature Storage temperature Maximum altitude Power source Dimensions Weight including batteries Note Accuracy values are guaranteed for 1 year after factory calibration at an operating temperature between 64 and 82 F 18 and 28 C All accuracy specifications must be derated increased by 5 5 for each...

Page 27: ...Ω 250msec ETL CAT III 600V CAT II 1000V 1 65 in 42mm 3 3 4 6000 20 minutes of front panel inactivity 14 to 122 F 10 to 50 C 4 to 140 F 20 to 60 C 6562 ft 2000m Three AAA batteries 8 86 x 3 31 x 1 30 in 225 x 84 x 33mm 14 8 oz 420g 3 165 3 3 x 5 5 x 1 for operation at 63 F and 83 F one degree outside the range 3 33 3 3 x 5 5 x 2 for operation at 62 F and 84 F two degrees outside the range 3 495 3 3...

Page 28: ...ons on p 10 Do not operate the CM660 700 in the presence of flammable or explosive gas or near an arc welder or induction heater After subjecting the meter to a large change in ambient temperature wait at least 30 minutes before making measurements to guarantee the accuracy of readings Remove the batteries when storing the meter or when you do not expect to use it for an extended period of time mo...

Page 29: ...be from an attempted repair by non authorized personnel or misuse alterations normal wear and tear or accidental damage The defective unit must be returned to General Tools Instruments or to a General authorized service center freight prepaid and insured Acceptance of the exclusive repair and replacement remedies described herein is a condition of the contract for purchase of this product In no ev...

Page 30: ...e contact our Customer Service to obtain an RGA Return Goods Authorization number before forwarding the unit via prepaid freight to the attention of our Service Center at this address General Tools Instruments 75 Seaview Drive Secaucus NJ 07094 212 431 6100 Remember to include a copy of your proof of purchase your return address and your phone number and or e mail address ...

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Page 32: ...9 TOLL FREE 800 697 8665 e mail sales generaltools com www generaltools com CM660 CM700 User s Manual Specifications subject to change without notice 2015 GENERAL TOOLS INSTRUMENTS NOTICE WE ARE NOT RESPONSIBLE FOR TYPOGRAPHICAL ERRORS MAN CM660 CM700 6 10 15 General Tools Instruments GeneralToolsNYC ...