Instruction Manual MODEL 382860 True RMS Power MultiMeter 1. INTRODUCTION Congratulations on your purchase of the Extech Model 382860 True RMS Power MultiMeter. Four LCD displays offer four simultaneous readings e.g.
. SPECIFICATIONS 2.1 General Specifications Display One Main and three Sub 3-3/4-digit (3999 count) LCDs plus 40segment bargraph Max. Input DC/AC : 20A Current Operating 0 to 104oF (0 to 40°C), relative humidity: <75%, not wetting Conditions Storage 0 to 122oF (-10 to 50°C), relative humidity: <76%, not wetting Conditions Power 9V Battery: NEDA 1604 9 V or 6F22 Dimensions 7.36x3.3x1.34” (187x84x34mm) Weight 9.8oz (305g) 2.
Mode Frequency (Sensitivity:>300mVrms) Temperature Mode Resistance Capacitance Diode Test Continuity Check Mode Power Measurements AC Current AC Voltage True Power True Power Phase angle (cosine) Power Factor Measuring Range 4kHz 40kHz 400kHz 4MHz 40MHz Accuracy Resolution ± (0.1% + 2dgts) -40°C to 200°C ± (3%+5dgts) +200°C to 1200°C ± (3%+2dgts) Range Accuracy ± (0.5% + 1dgts) 400Ω 4k Ω 40k Ω 400k Ω 4M Ω ± (1% + 2dgts) 40M Ω 4nF ±2.
3. METER DESCRIPTION • • • • • • • Function Keys: Power ON/OFF Key FUNCTION Select Key Set/Reset Key AC/DC Ohm/Continuity Key UP Key DOWN Key Backlight Adjust Button • • • • Input Terminals 20-A Input Socket mA-input COM Socket (- Terminal) V-ohm Socket (+ Terminal) 4.
• • • • • • To avoid an electrical shock, don’t touch directly or indirectly the test probes and the test points during measurement. To avoid serious electrical shock and/or instrument damage, do not apply more than 500 VDC/VAC rms between any meter input terminal and earth ground. Do not use meter near strong magnetic fields (loudspeakers, magnets), electromagnetic fields (transformers, motors, coils, relays, contactors, electromagnets etc.
5. BASIC METER OPERATION 5.1 Quick Start • Connect the test leads to the meter • Press the “ON/OFF” key to power the meter. • Turn the rotary function switch to the desired measurement position. The meter is now ready for “normal” measurement operation. • To select an advanced function, press the FUNCTION key. The available functions will appear on the top of the LCD display. Press FUNCTION again to scroll through this function list. Press the SET/RESET key to select an advanced function.
• • • m A-Measuring Socket For DC/AC mA current measurements below 400mA, insert the Red test-lead to this terminal. COM (Common or Negative Input Terminal For all measurements, except capacitance, temperature and transistor measurements, the Black test lead is connected here V/Ohm -Socket For measurements of voltage, frequency, resistance, continuity, diode and logic, insert the Red test lead into this terminal. 5.
• MEM (Memory): Up to 10 measurements (0 to 9) can be stored and recalled. Press the FUNCTION key five times then press the SET/RESET key once to store the present measurement value in the first available memory location. The memory location number will flash to the upper left of the left-most sub-LCD. The memorized reading is shown on the center sub-LCD. Use the UP/DOWN keys to scroll to the next free memory location. Take another measurement and press the SET/RESET key to store it.
6. MEASUREMENT INSTRUCTIONS 6.1 Voltage AC/DC Measurements (True RMS for AC Voltage) Attention: Never exceed the maximum input limits (1000VDC or 750 VAC rms).Keep hands away from circuits where 25 VAC rms or 35 VDC exists. To measure DC / AC voltage proceed as follows: 1. Set the rotary function switch to the desired position (mV or V) 2. Press the DC/AC key until the desired units are displayed (AC or DC). 3. Connect the test-lead tips to the object under test (load, circuit etc.) 4.
2. Connect the test-leads to the device under test. Ensure that all power is removed from devices under test. Auto Range selects the appropriate range automatically. 3. Normally the resistance of the test-leads can be disregarded (approx. 0.1 to 0.2 Ohm). However, this small value can cause inaccuracy in the 400 Ohm range. To determine the error before measurement, short the test-lead tips and read the resistance value on the display. Subtract this value from readings to cancel lead resistance errors. 4.
6.7 Capacitance Measurement Attention: When shorting capacitors (discharging), high-energy discharge of electricity may occur. Do not touch the terminals if there are capacitors with voltages over 35 VDC or 25 VAC. Use special caution in environments where flammable gases, steam or dust could trigger combustion 1. 2. 3. 4. Discharge each capacitor before testing. Never attempt to measure the capacitance of a charged capacitor, you might damage your multimeter.
4. 5. 6. Now connect the other end of the black test-lead to the “ground” point of the digital circuit and the red test-probe to the supply voltage point (V+ or Vcc) When all leads are connected, press the SET/RESET key to save the “High” Reference Level. With the black test-lead-at ground, move the red test-probe from the supply voltage to the desired test points. The multimeter will immediately display one of the three modes.
Mode 0 Main LCD Watts Mode 1 Watts Mode 2 Accumulated Watts Left sub-LCD Center sub-LCD Right sub-LCD AC Load AC Voltage Phase angle (cosine) Current Rate Cost/hour Accumulated Accumulated consumption Watts cost in $ EDIT the Rate Unit 1KW/Hr NO DISPLAY Cost/hour TABLE 1: Three Power Measurement Display Modes 7.2.
4. Switch setting from POWER with the Adaptor connected. Serious injury and meter damage can result. The meter always memorizes the last input values of cost per hour, KW/H, and accumulated costs that were measured. 8. CMOS Signal Output Your meter is equipped with a “Function Generator” which supplies outputs of ten preset frequencies with a voltage max. of 3.3V. To “tap off” the signal, insert the enclosed signal adaptor into the capacitor socket, observing the correct polarity.
9.2.2 Using the Windows Software Follow these steps to install and run the Windows software Note: The following steps assume a basic knowledge of Microsoft Windows. This software requires Microsoft Windows, Version 3.1 or later and a VGA or EGA display. 1. Start your computer and run Windows. 2. Insert the supplied diskette in your computer’s 3 ½-inch floppy drive. 3. For Windows 3.1 go to Program Manager and pull down the FILE menu. Select RUN. 4. For Windows 95, choose RUN from the START menu. 5.
11. REPAIR AND CALIBRATION SERVICES Extech offers complete repair and calibration services for all of the products we sell. For periodic calibration, NIST certification or repair of any Extech product, call customer service for details on services available. Extech recommends that calibration be performed on an annual basis to insure calibration integrity. 12.
