Major tech MT330 Instruction Manual - Page 7

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7. BUTTON FUNCTION OPERATION

The hold function freezes the reading in the display. Press the HOLD

key momentarily to activate or to exit the hold function

Press the

backlight will automatically turn off after 15 seconds.

8. MEASUREMENT OF EFFECTIVE RESISTANCE OF EARTH

ELECTRODES

BEFORE PROCEEDING MEASUREMENT, READ SAFETY NOTES ON

PAGE 4.

1. In proceeding with measurement, if symbol appears on the display,

replace with new batteries.

2. Short the tips of the leads and press the "TEST" button. Adjust the 0Ω

"ADJ" turn cap control to set the reading of zero.

3. Rotary to function switch to "EARTH VOLTAGE" position and press to

test. Earth voltage will displayed on the LCD. When earth voltage is

more than 10V, it may result in errors in earth resistance measurement.

Accurate earth resistance measurement may not be made.

4. Precision earth resistance measurement method :

(1) Connect green, yellow and red test leads to instrument terminals E, P

and C with auxiliary earth spikes P1, C1 stuck into earth "IN A

STRAIGHT LINE ".(Fig.1)

(2) Rotary the function switch to suitable range then press the push

button to test and take the reading.

key for to turn on the display backlight function. The