WIRELESS DATA LOGGING MULTIMETER WITH DUAL 7-SEGMENT LCD PLUS NCVD/NCCD USER’S MANUAL (laptop not included) GT310 (optional RD330 not included) Please read this manual carefully and thoroughly before using this product.
TABLE OF CONTENTS Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 – 4 Key Features & Specs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 What’s in the Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 – 8 Product Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 – 11 Setup Instructions. .
INTRODUCTION Thank you for purchasing General Tools & Instruments’ GT310 Wireless Data Logging Multimeter with Dual 7-Segment LCD plus NCVD/NCCD. Please read this manual carefully and thoroughly before using the instrument. The GT310 can measure—with better than 1% accuracy, in most cases—the six electrical parameters (DC voltage, AC voltage, DC current, AC current, resistance and capacitance) that most professional-grade multimeters measure.
The GT310 can be part of three different kinds of wireless communication schemes. 1. The meter includes a small USB receiver—called a dongle—that enables any PC to display all the information shown on the unit’s display. The “Going Wireless” section of this user’s manual provides instructions for downloading the software needed to activate this connection.
KEY FEATURES & SPECS • 12 functions, 33 ranges • Measures AC/DC voltage (up to 750VAC/1000VDC), AC/DC current (up to 400mA), resistance (up to 40mΩ) and capacitance (up to 100 uF) • Verifies integrity of diodes and checks circuits for continuity • Includes double-insulated test leads; red lead has fast-acting ceramic fuse rated at 500mA/500V and unique square plug. Corresponding square jack on meter prevents potentially damaging use of round, non-fused leads.
WHAT’S IN THE BOX The GT310 comes in a black soft pouch inside a box. Also inside the box are: • A pair of fused test leads (General Part No. TL300) • A USB dongle (General Part No. GTSF05) for wireless viewing of the meter’s display on a PC. Software for enabling the dongle to display the GT310’s readings on a PC is downloadable from the GT310 page of General’s website.
• !WARNING Do not measure voltages above 500V in CAT III installations. • !WARNING Do not measure voltage with the rotary dial pointing to the resistance (ohms), current, capacitance or NCVD or NCCD positions. Never measure current with the dial pointing to the resistance (ohms), capacitance or NCVD or NCCD positions. • Use caution when working with voltages above 42V ACrms, or 60V DC. These voltages pose a shock hazard. • Use the proper terminals, function, and range for all measurements.
PRODUCT OVERVIEW Fig. 1 shows the labels and positions of the controls, indicators and connectors on the front and top of the GT310. Familiarize yourself with their functions, as explained below, before moving on to the Setup Instructions and Operating Instructions. GT310 Fig. 1. The GT310’s controls, indicators and connectors 1. Replaceable 2.4GHz transceiver module (on top of unit) 2. NCCD sensor (on top of unit) 3. NCVD sensor (on top of unit) 4. Two-line, 7-segment LCD 5.
6. Two-function Range button: a) In all measurement modes, press briefly to exit Auto ranging mode (default) and enter Manual Ranging mode. With two exceptions (the highest voltage ranges), each subsequent brief press of the button decreases the measurement sensitivity (increases the full-scale measurement range) by a factor of 10 (one decimal place) b) In all measurement modes, press and hold for >3 seconds to exit Manual Ranging mode and enable Auto ranging 7.
c) In channel entry mode (with channel number flashing in top or bottom readout), press briefly to increment channel number. Pressing the button briefly with the display showing CH-9 resets readout to CH-0 11. Two-function Hold/CH button: a) Press briefly to hold (freeze) reading(s). Press briefly again to release hold. b) Press and hold for >3 seconds to enter Hi channel entry mode. In Hi channel entry mode, press briefly to enter Lo channel entry mode.
Diode Auto ranging Low battery Overvoltage Category 3 Overvoltage Category 4 Ground Beeper Non-Contact Voltage (AC) Detection Non-Contact Current (AC) Detection SETUP INSTRUCTIONS INSTALL BATTERY The battery of your GT310 may or may not already be installed. If the display remains dark after you turn the rotary dial to any position other than OFF: • Return the rotary dial to the OFF position. • Disconnect test leads.
OPERATING INSTRUCTIONS GENERAL INSTRUCTIONS • To hold (freeze) a reading, briefly press the Hold/CH button. • To turn the beeper on or off, press and hold the Buzzer button. • To turn the backlight on or off, briefly press the Buzzer button. • The meter is equipped with an Auto Power Off (APO) function that is triggered by 15 minutes with no input. It cannot be disabled.
Touch the test leads to two points in a circuit at different electric potential. A minus sign (–) at the left of the reading indicates a negative voltage. To switch to Manual Ranging mode, press the Range button briefly once to remove the AUTO indication from the top left of the display. With two exceptions (the highest ranges), each subsequent brief press of the button decreases the measurement sensitivity (increases the full-scale measurement range) by a factor of 10 (one decimal place).
CHECKING THE INTEGRITY OF A DIODE OR THE CONTINUITY OF A CIRCUIT Before checking a diode or checking for continuity, be sure to remove power from the circuit under test. Turn the rotary dial to the Ω position. With the symbol MΩ at the right of the display, briefly press the Select/0-9 button once to call up the diode symbol . Connect 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).
The default mode is DC current measurement (indicated by the symbol near the top left of the display). To measure AC current, press symbol to ~. the Select/0-9 button to change the Touch the test leads to two points in the circuit and read the displayed value. A minus sign (-) at the left of the reading indicates a negative value in DC current mode. If applying current produces a reading of OL in uA Measurement mode, switch to mA Measurement mode.
GOING WIRELESS Transmitting Data to a PC Use the following procedure to enable your GT310 to display its readings on a PC monitor using digits that are several inches high— large enough to be visible across a room. You will first download and install the software that enables your GT310 to communicate with the GTSF05 wireless USB receiver (dongle) supplied with the meter. The final few steps of the procedure explain how to match the software’s receiving channel to the transmitting channel of the GT310. 1.
15. Plug the dongle into any open USB port on your computer. Doing so will cause the following screen to appear. 16. On the meter, press the Power/Tx/Rx/Ax button once. The icon will appear at right. You will next choose CH-1 as the meter’s transmitting channel. To do so, press and hold the Hold/CH button. When a flashing “0” (the default channel number) appears at the right of CH- on the upper readout, quickly (within 10 seconds) press the Select/0-9 button once to advance the channel counter to “1”.
19. The reading on the DMMD_PCView screen will continue to duplicate the contents of the GT310’s upper readout. Receiving and Displaying Data from a Second GT310 or a GT320 To configure your GT310 to receive display measurements and indications from another GT310 or a GT320 wireless multimeter, use the Power/Tx/Rx/Ax button. When the meter is powered on, the default setting is no communication. To enable transmission, briefly press the Power/Tx/Rx/Ax button once.
To enable transmission and reception, briefly press the Power/Tx/Rx/Ax button a third time. This will cause both “satellite dish” icons to appear at the right of the display. The upper readout will display data from your GT310 and the lower readout will display data from the second multimeter.
• Communication Range: >33 ft. (10m) • Auto Power Off Interval: 15 minutes • Backlight Fadeout Interval: 90 seconds • Power Source: (1) “9V” battery • Power Consumption: <3mA (standby mode); <20mA (normal operating mode); <25mA (transmitting mode); <60mA (receiving mode); <80mA (transmit + receive mode) • Dimensions (Excluding Test Leads): 7.1 x 3.7 x 2.1 in. (180 x 95 x 54mm) • Weight (Excluding Battery): 1 lb.
DC Current (uA Setting, Manual Range) Range 0-400uA 0-4000uA Resolution 0.1uA 1uA Accuracy ±0.12% of reading ±3 digits ±0.12% of reading ±3 digits AC Current (mA Setting, Manual Range Range 0-40mA 0-400mA Resolution 0.01mA 0.1mA Accuracy ±0.15% of reading ±5 digits ±0.15% of reading ±5 digits DC Current (mA Setting, Manual Range) Range 0-40mA 0-400mA Resolution 0.01mA 0.1mA Accuracy ±0.15% of reading ±5 digits ±0.15% of reading ±5 digits Resistance (Manual Range) Range 0-400Ω Resolution 0.
Continuity Check Range 400Ω (Display reading) Beeper sounds when<30Ω Resolution 0.0Ω 0.0Ω Accuracy ±0.8% of reading ±6 digits ±0.
WARRANTY INFORMATION General Tools & Instruments’ (General’s) GT310 Wireless Data Logging Multimeter with Dual 7-Segment LCD plus NCVD/NCCD is warranted to the original purchaser to be free from defects in material and workmanship for a period of one year. Subject to certain restrictions, General will repair or replace this product if, after examination, the company determines it to be defective in material or workmanship.
GENERAL TOOLS & INSTRUMENTS 80 White Street New York, NY 10013-3567 PHONE (212) 431-6100 FAX (212) 431-6499 TOLL FREE (800) 697-8665 e-mail: sales@generaltools.com www.generaltools.com GT310 User’s Manual Specifications subject to change without notice ©2012 GENERAL TOOLS & INSTRUMENTS NOTICE - WE ARE NOT RESPONSIBLE FOR TYPOGRAPHICAL ERRORS.
