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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 20 minutes* of inactivity. Press any button or turn either of the rotary
knobs to turn back on.
* 2 minute option 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. The left RED button also performs storage and lock functions on the
MFT1730.
3.1.4 Test button lock
To lock the test button hold down either of the RED test lock buttons with the
symbol, whilst holding down the test but-
ton. 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:
3.3 Test inhibit
Each test mode has conditions under which testing will be inhibited, as below:
3.3.1 Insulation
Detection of a circuit voltage above 50 V (a warning is displayed at 25 V)
3.3.2 Continuity
Detection of a circuit voltage above that used by the instrument will inhibit testing.
Test selected Function Options Comments
V/ºC Volts (mv model specific) Temperature requires suitable transducer
Continuity
RLO
Buzzer
ENABLE/DISABLE
Buzzer ON
Buzzer OFF
Buzzes on <2 Ω
May be changed in SETUP.
Refer to Section 10.
Insulation
RSIO
Buzzer
ENABLE/DISABLE
Buzzer ON
Buzzer OFF
Buzzes on <1 MΩ
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
0º /180º selection
0º
180º
(Press and release)
RCD Type
AC
A
AC(s)
A(s)
B
(Press and HOLD)
Type B available on MFT1730 only
EARTH (RE) Touch voltage limit 50 V/ 25 V
(Press and release)
MFT1730 only
SETUP
Refer to instrument setup
section 10.
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