Page 2 - INTRODUCTION; KEY
Extech Instruments 2 GX900-EU-EN V1.6 4/14 INTRODUCTION Thank you for selecting the Extech Model GX900 True RMS Multimeter with high measurement accuracy, quick A/D conversion rates, and built ‐ in datalogging and trending features. This de...
Page 3 - TABLE
Extech Instruments 3 GX900-EU-EN V1.6 4/14 TABLE OF CONTENTS INTRODUCTION ....................................................................................... 2 KEY FEATURES ......................................................................................... 2 T...
Page 4 - FUNCTIONS
Extech Instruments 4 GX900-EU-EN V1.6 4/14 CURRENT CLAMP MEASUREMENTS ....................................................... 17 DC CURRENT MEASUREMENTS .............................................................. 18 AC CURRENT MEASUREMENTS ............................
Page 5 - TM; BATTERY
Extech Instruments 5 GX900-EU-EN V1.6 4/14 ZOOMING ON TREND DATA ................................................................... 32 METER SETUP OPTIONS ......................................................................... 32 RESET THE METER SETUP OPTIONS ...
Page 6 - SAFETY
Extech Instruments 6 GX900-EU-EN V1.6 4/14 SAFETY INTERNATIONAL SAFETY SYMBOLS This symbol, adjacent to another symbol or terminal, indicates the user must refer to the manual for further information. This symbol, adjacent to a term...
Page 7 - CAUTIONS
Extech Instruments 7 GX900-EU-EN V1.6 4/14 CAUTIONS Improper use of this meter can cause damage, shock, injury or death. Read and understand this user manual before operating the meter. Always remove the test leads before replacing ...
Page 9 - FCC
Extech Instruments 9 GX900-EU-EN V1.6 4/14 FCC COMPLIANCE This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: 1. This device may not cause harmful interference. 2. This device ...
Page 10 - DESCRIPTIONS; METER
Extech Instruments 10 GX900-EU-EN V1.6 4/14 DESCRIPTIONS METER DESCRIPTION 1. LCD display 2. Sub ‐ function keys F1, F2, F3, and F4 3. Data HOLD button 4. MAX ‐ MIN memory button 5. Rotary Primary Function Select Switch 6. Input jack for Ampe...
Page 11 - KEYPAD
Extech Instruments 11 GX900-EU-EN V1.6 4/14 KEYPAD DESCRIPTION The meter’s 12 push ‐ button keypad activates features, augments functions selected by the rotary switch, and allows the navigation of the displayed menu structure F1 ‐ F2 ‐ F3 ‐ ...
Page 12 - LCD
Extech Instruments 12 GX900-EU-EN V1.6 4/14 LCD DISPLAY DESCRIPTION 1. Soft key labels indicate the function of the button just below the displayed label. 2. Bar graph Analog display for the input signal (See the "Bar Graph" sec...
Page 13 - QUICK
Extech Instruments 13 GX900-EU-EN V1.6 4/14 QUICK START GUIDE Step One: Ensure that batteries are installed and are fresh Step Two: Carefully read the Safety section of this Instruction Manual Step Three: Check the Table of Cont...
Page 14 - MEASUREMENTS; WARNING; OFF; DC; COM
Extech Instruments 14 GX900-EU-EN V1.6 4/14 MEASUREMENTS WARNING : Risk of electrocution. High ‐ voltage circuits, both AC and DC, are very dangerous and should be measured with great care. 1. ALWAYS turn the function switch to the OFF ...
Page 15 - AC
Extech Instruments 15 GX900-EU-EN V1.6 4/14 AC VOLTAGE MEASUREMENTS WARNING: Risk of Electrocution. The probe tips may not be long enough to contact the live parts inside some 240V outlets for appliances because the contacts are rec...
Page 16 - mV
Extech Instruments 16 GX900-EU-EN V1.6 4/14 LOW PASS FILTER FOR ACV MEASUREMENTS The meter is equipped with a Low Pass Filter for AC measurements. To activate the filter please follow the steps below: 1. Set the rotary switch to t...
Page 17 - CURRENT
Extech Instruments 17 GX900-EU-EN V1.6 4/14 CURRENT CLAMP MEASUREMENTS 1. This meter offers remote current clamp measurement functionality. 2. Set the rotary switch to the mV position. 3. Press the F1 key (MENU), move the menu selector to...
Page 20 - RESISTANCE
Extech Instruments 20 GX900-EU-EN V1.6 4/14 RESISTANCE MEASUREMENTS WARNING: To avoid electric shock, disconnect power to the unit under test and discharge all capacitors before taking any resistance measurements. Remove the batteries and u...
Page 21 - CONTINUITY; DIODE
Extech Instruments 21 GX900-EU-EN V1.6 4/14 CONTINUITY CHECK WARNING: To avoid electric shock, never measure continuity on circuits or wires that have voltage on them. 1. Set the function switch to the Ω CAP position. 2. Press the ...
Page 22 - TEMPERATURE; TEMP
Extech Instruments 22 GX900-EU-EN V1.6 4/14 TEMPERATURE MEASUREMENTS 1. Set the function switch to the TEMP position. 2. Press the F1 key (MENU), move the menu selector to the item labeled TEMP, and then press the OK key 3. Move t...
Page 23 - CAP
Extech Instruments 23 GX900-EU-EN V1.6 4/14 CAPACITANCE MEASUREMENTS WARNING: To avoid electric shock, disconnect power to the unit under test and discharge all capacitors before taking any capacitance measurements. Remove the batteries and ...
Page 24 - RPM; COUNTER; RPM
Extech Instruments 24 GX900-EU-EN V1.6 4/14 RPM MEASUREMENTS 1. Set the rotary function switch to the RPM position. 2. Insert the black lead banana plug into the negative COM jack and the red test lead banana plug into the positive ...
Page 27 - MINIMUM
Extech Instruments 27 GX900-EU-EN V1.6 4/14 MINIMUM (MIN) AND MAXIMUM (MAX) READINGS The MIN ‐ MAX recording mode captures minimum, maximum, and average measurement values. When the measurement falls below the recorded minimum value or abov...
Page 28 - CAPTURING
Extech Instruments 28 GX900-EU-EN V1.6 4/14 CAPTURING PEAK VALUES To activate the PEAK Mode, press the F1 key (MENU). Move the menu selector to the menu item labeled PEAK/CREST F (Crest Factor) and then press the OK key. Move th...
Page 30 - VIEW
Extech Instruments 30 GX900-EU-EN V1.6 4/14 VIEW TREND DATA Viewing data stored in the meter’s memory is performed through the SAVE menu as described below: 1. Press the F2 key (SAVE) and select menu item MEMORY and Press the OK ...
Page 31 - RECORDING
Extech Instruments 31 GX900-EU-EN V1.6 4/14 RECORDING MEASUREMENTS (DATALOGGING) The meter’s datalogger collects measurement information over a user ‐ specified duration (sampling rate). A datalogging recording session is made up of one or more...
Page 34 - CALIBRATION; CAPABILITY
Extech Instruments 34 GX900-EU-EN V1.6 4/14 CALIBRATION ACCESS The Calibration selection allows a qualified calibration technician to enter a password that grants access to the meter for calibration purposes. 1. Press the F4 key (SETUP) t...
Page 38 - FUSE
Extech Instruments 38 GX900-EU-EN V1.6 4/14 FUSE REPLACEMENT 1. Switch the meter off and remove the test leads from the meter’s input jacks 2. Remove the battery compartment cover. 3. Remove the fuse from the battery compartment by firs...
Page 39 - SPECIFICATIONS; GENERAL
Extech Instruments 39 GX900-EU-EN V1.6 4/14 SPECIFICATIONS GENERAL SPECIFICATIONS Enclosure Double molded, waterproof Shock (Drop Test) 2m (6.5 ft) Diode Test Test current 0.9mA maximum, open circuit voltage 3.2V DC (typ.) Continuity Check Audible signal will sound if the resistance is l...
Page 40 - ELECTRICAL
Extech Instruments 40 GX900-EU-EN V1.6 4/14 ELECTRICAL SPECIFICATIONS Function Range Resolution Accuracy DC Voltage 50mV [¹] 0.001mV (0.05% + 20) 500mV [¹] 0.01mV (0.025% + 5digits) 5V 0.0001V (0.025% + 5digits) 50V 0.001V (0.025% + 5digits) 500V 0.01V (0.05% + 5digits) 1000V 0.1V (0.1% + ...
