Extech Instruments GRT300 User Manual Download Page 8

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GRT300-EU-EN v1.1 08/13

Specifications

Measuring Ranges

Earth Resistance: 0-2

Ω

, 0-20

Ω

, 0-200

Ω

, 0-2k

Ω

Earth Voltage:

0-300V AC (40 to 500Hz)

Accuracy

Earth Resistance: ±(2%rdg+3dgt)
Earth Voltage:

±(2%rdg+3dgt)

Earth Resistance
Resolution

0-2

Ω

: 0.01

Ω

0-20

Ω

: 0.1

Ω

0-200

Ω

: 1

Ω

0-2k

Ω

: 0.01k

Ω

Test Frequency

820Hz

Test Current

2mA

Temperature & Humidity

Operating : 0 to 50°C (32 to 122°F)

80%R.H.

Storage : -10 to 60°C (14 to 140°F)

80%R.H.

Power Source

1.5V(AA) x 8

Dimensions

250(L) x 190(W) x 110(D)mm (9.84x7.5x4.33”)

Weight

Approx. 1430g(battery included)

Fuse(

0.1A/250V 5 x 20mm

Summary of Contents for GRT300

Page 1: ...User Guide 4 wire Earth Resistance Tester Model GRT300 ...

Page 2: ...se the meter only as specified in this manual Otherwise the protection provided by the meter may be impaired Rated environmental conditions Indoor outdoor use Installation Category IV 300V Pollution Degree 2 Altitude up to 2000m Relative Humidity 80 max Ambient temperature 0 40 C Observe the International Electrical Symbols listed below Detector is protected throughout by double insulation or rein...

Page 3: ...tic P spike check 2 wire test 3 wire test 4 wire test Auto power off Data hold Safety standard EN 61010 1 CATIV 300V EN 61326 1 Meter Description 1 C1 terminal Black test lead connection 2 P1 terminal Green test lead connection 3 P2 terminal Yellow test lead connection 4 C2 terminal Red test lead connection 5 Display 6 Rc LED 7 Rp LED 8 2 Wire button 9 3 Wire button 10 4 Wire button 11 ACV button ...

Page 4: ...X AC 300V P2 C2 C1 P1 H S E ES 1 2 1 Earth electrode rod under test 2 Test spike 2 Press the ON OFF button and wait for Select Function to appear on the display 3 Press the ACV button and then the TEST STOP button 4 The earth voltage will be displayed on the display Note When the earth voltage is more than 10V errors in earth resistance measurements may occur Make sure that the indicated value is ...

Page 5: ...s possible into the soil The distance between spikes must be 5 to 10 meters 16 to 32 feet Four terminal earth resistance measurements 1 2 MAX AC 300V H S E ES P2 C2 C1 P1 3 1 Earth electrode rod under test 2 Potential spike 3 Current spike Three terminal earth resistance measurements 1 2 MAX AC 300V H S E ES P2 C2 C1 P1 3 1 Earth electrode rod under test 2 Potential spike 3 Current spike Two termi...

Page 6: ...utput Check connections Rp If Rp is on and the display indicates 2 kΩ the earth resistance is greater than 2000Ω If in 4P mode the display shows Vp Error short circuit C1 black and P1 green Measurement Considerations 2 terminal testing of earth resistance is appropriate for most general purpose testing in normally conductive soil But 2 terminal measurements include test lead and contact resistance...

Page 7: ...ery Low appears on the display replace the batteries 1 Disconnect the test leads from the instrument and remove the rear cover and the batteries 2 The tester s battery is situated under the tester 3 Replace with eight 1 5V AA light batteries taking care to observe correct polarity 4 Reinstall battery holder and the battery cover Cleaning And Storage WARNING To avoid electrical shock or damage to t...

Page 8: ...Earth Voltage 2 rdg 3dgt Earth Resistance Resolution 0 2Ω 0 01Ω 0 20Ω 0 1Ω 0 200Ω 1Ω 0 2kΩ 0 01kΩ Test Frequency 820Hz Test Current 2mA Temperature Humidity Operating 0 to 50 C 32 to 122 F أ 80 R H Storage 10 to 60 C 14 to 140 F أ 80 R H Power Source 1 5V AA x 8 Dimensions 250 L x 190 W x 110 D mm 9 84x7 5x4 33 Weight Approx 1430g battery included Fuse 0 1A 250V 5 x 20mm ...

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