10
3. Operation
3.1 General operation – all models
3.1.1 Switching on
Turn the rotary knob away from the off position.
The instrument will perform internal self tests then display the appropriate test screen, depending on the position of the function knobs.
3.1.2 Switching off
Turn the primary function knob to the OFF position.
The instrument will automatically turn itself off after 10 minutes* of inactivity. Press any button or turn either of the rotary knobs to turn
back on.
* 2 minute or ‘no auto-off’ options in SETUP, refer to section 10.
3.1.3 Backlight
Press the backlight button. The backlight will operate for 20 seconds.
3.1.4 Test buttons
Test buttons are duplicated on the Left and right. Both buttons perform the same function except when the is displayed, in this case
the right hand buttons perform a scrolling function.
3.1.5 Test button lock
To lock the test button hold down either of the RED test lock buttons with the L symbol, whilst holding down the test button. If
is displayed the right hand buttons perform a scrolling function.
3.2 Mode button functions
The function of the mode button is dependent on the test function selected:
Test selected Function Options Comments
V/mVºC Volts (mv model specific)
Temperature
Temperature requires a suitable
transducer
Continuity
RLO
Buzzer
ENABLE/DISABLE
Buzzer ON
Buzzer OFF
Buzzes on <2W
May be changed in SETUP. Refer to
Section 10.
Insulation
RSIO
Buzzer
ENABLE/DISABLE
Buzzer ON
Buzzer OFF
Buzzes on >1MW
May be changed in SETUP. Refer to
Section 10.
Loop impedance (Z)
L-PE
3Lo – 3 wire no trip
2Hi – 2 wire high current
2Lo – 2 wire no trip
3Lo
2Hi
2Lo
3Lo default measurement
2Lo not available if 3 wire
connection is detected
RCD 0 º /180 º selection 0º
180 º
(Press and release)
RCD Type AS
A
AS(s)
A(s)
B
(Press and HOLD)
Type B available on MFT1835 only
EARTH (RE) Touch voltage limit 50V / 25v (Press and release)
SETUP Refer to instrument setup section 10
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