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Summary of Contents for Extech Instruments MultiLog ML720
- Page 1 User’s Guide MultiLog™ Digital MultiMeter With built-in Datalogger Model ML720...
- Page 2 Introduction Congratulations on your purchase of Extech model ML720 True rms datalogging digital multimeter. Properly used, this meter will provide many years of reliable service. MultiLog™ measures AC/DC Voltage/Current, Resistance, Frequency, Capacitance, Temperature, Diode, and Continuity. The MultiLog™ offers a built-in datalogger and an optical RS-232 interface. The meter stores 43,000 data points in internal memory.
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Page 3: Overvoltage Category
8. Remove the battery from the meter if the meter is to be stored for long periods. 9. To avoid electric shock, do not measure AC current on any circuit whose voltage exceeds 500V AC. 10. Voltage checks on electrical outlets can be difficult and misleading because of the uncertainty of connection to the electrical contacts. - Page 4 Specifications DC VOLTAGE RANGE Accuracy 50.00 mV 0.12% + 2d 500.0 mV 0.06% + 2d 5.000V, 50.00V, 500.0V, 1000V 0.08% + 2d NMRR: >60dB @ 50/60Hz, CMRR: >120dB @ DC, 50/60Hz, Rs=1kΩ Input impedance: 10MΩ, 16pF nominal (44pF nominal for 50mV & 500mV ranges) AC VOLTAGE RANGE...
- Page 5 AC CURRENT RANGE Accuracy Burden Voltage 50 / 60Hz 0.6%+3d 500.0µA, 5000µA 0.15mV/µA 50.00mA, 500.0mA 0.6%+3d 3.3mV/mA 5.000A, 10.00A* 0.6%+3d 0.03V/A 40Hz to 1kHz 0.8%+4d 500.0µA, 5000µA 0.15mV/µA 50.00mA 0.8%+4d 3.3mV/mA 500.0mA 1.0%+4d 3.3mV/mA 5.000A, 10.00A* 0.8%+4d 0.03V/A *10A continuous, 20A for 30-second max with 5 minute cool down interval TEMPERATURE RANGE Accuracy...
- Page 6 FREQUENCY Function Sensitivity Range (ACrms) 300mV 10Hz - 125kHz 10Hz - 125kHz 10Hz - 20kHz 500V 10Hz - 1kHz 1000V 300V 10Hz - 1kHz Ω, Cx, diode 300mV 10Hz - 125kHz µA, mA, A 10% F.S. 10Hz - 125kHz Accuracy: 0.01% + 2d Accuracy Notes: Accuracy is ±...
- Page 7 Temp. Coefficient: Nominal 0.15 x specified accuracy per ºC (between 0 and 18 C or 28 to 50 C), or as otherwise specified Power Supply: 9V battery (NEDA1604, JIS006P or IEC6F22) AC Sensing: True RMS Auto Power Off: After 17 minutes of inactivity with no input signal Safety: Intended for indoor use and protected by double insulation per EN61010-1 and IEC61010-1 2nd Edition (2001) to CAT III...
- Page 8 Meter Description 1. 5000 count Liquid Crystal display 2. Function push-buttons 3. Rotary function switch 4. 10A input jack 5. V/Hz/Ω/Cap/Temp input jack 6. COM input jack 7. mA/uA current input jack 8. RS232 connector (rear)
- Page 9 Features Analog Bargraph display Visual indication of measurement in the tradition of an analog meter pointer. The bargraph consists of 52 discrete viewing segments. The bargraph useful detecting faulty contacts, identifying potentiometer gradations, and viewing signal spikes. True RMS vs. Average Sensing (AC Measurements) True RMS meters can accurately measure non-sinusoidal waveforms, as well as distorted sine waves that contain harmonics.
- Page 10 Operation Measurement Considerations NOTICE: Read and understand all warning and caution statements listed in the safety section of this operation manual prior to using this meter. 1. Always move the rotary function switch to the OFF position when the meter is not in use. This meter has Auto Power OFF that automatically shuts the meter OFF if 17 minutes elapse without activity.
- Page 11 Resistance and Continuity Measurements 1. Insert the black test lead banana plug into the negative COM jack and the red test lead banana plug into the V/Ω/CAP jack. 2. Set the function switch to the "Ω " position. 3. Press the SELECT key momentarily to select Continuity (if required). 4.
- Page 12 Frequency Measurements 1. Connect and make the measurement required as described in the previous paragraphs. 2. Press the Hz key to select the Frequency (Hz) function. 3. Read the frequency on the display Notes on sensitivity: Input sensitivity varies automatically with function range selected. The mV function has the highest (300mV) and the 1000V range has the lowest (300V) sensitivity.
- Page 13 Datalogging Datalogging Basics The ML720 can store up to 43,000 readings automatically. These readings can be viewed on the LCD display or transferred to a PC using the PC interface cable and Windows software included. Datalogging Note: Each time the datalogging "Strt" process is initiated, existing data will be erased.
- Page 14 Recalling Stored Readings To recall stored data, press the START, UP or DOWN arrow key momentarily to “CALL” the logged data. The LCD will show a flashing “C” (CALL) to indicate that the data shown is logged data. The data can also be transferred to a PC using the supplied Windows software and interface cable.
- Page 15 Datalogging Sampling Rate Press the TIMER key momentarily to display the datalogger’s sampling rate (recording interval). The factory default interval is 0.05 seconds, meaning that a reading will be logged every 5 hundredths of a second. Press the UP or DOWN arrow key momentarily to select an alternate sampling interval.
- Page 16 Maintenance WARNING: To avoid electrical shock, disconnect the meter from any circuit, remove the test leads from the input jacks and turn OFF the meter before opening the case. Do not operate with open case. Install only the same type of fuse or equivalent Cleaning and Storage Periodically wipe the case with a damp cloth and mild detergent;...
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