8
Notes:-
Method of measurement
The 2-wire lead set must be used for this measurement. The instrument
produces a d.c. voltage of nominally 4,5 V with a current limit of at least
200 mA when measuring 2 Ω.
Possible sources of error
Measurement results can be affected by the following:
■ The impedance of operating circuits connected in parallel.
■ Impedance such as inductors that vary during the measurement.
■ A poor connection to the circuit under test, which can give readings as
much as 100 mΩ (0,10 Ω) high. The best way to avoid this error is to
use sharp prods and press these firmly into the conductors being
measured.
INSULATION RESISTANCE [MΩ] [250 V] [500 V] [1000 V]
Warning: Prior to any insulation testing, ensure the circuits under test are
isolated and not live.
TEST LEAD CONNECTION
are connected to the circuit under test. The contact symbol on the
display closes when a resistance of approximately 200 kΩ or less is
detected.
Lead null (up to 9.99 Ω)
Short test probes or clips together and press the YELLOW TEST button on
the instrument (or on the switched probe if fitted). The
z
will be
displayed to indicate lead null is active.
This null value is stored until the YELLOW TEST button is pressed
again.
To cancel the LEAD NULL, press the YELLOW TEST button.
Continuity Buzzer
Z
Test leads OPTIONS 1 or 2 above
The MFT buzzer will sound continuously if the resistance between the
leads is less than a set limit (Default value 2 Ω).
If being used with the illuminated switched probe (OPTION 2) continuity
is also indicated by a GREEN LED on the probe.
To turn off the buzzer press the TEST button whilst in BUZZER mode. The
display will indicate ON or OFF status.
Buzzer threshold
The resistance at which the buzzer stops sounding can be changed to
meet individual test requirements. Press the ORANGE
Z
button to select
the resistance limit.
Selectable limits of 2 Ω, 5 Ω, 10 Ω, 20 Ω, 50 Ω and 100 Ω.
This setting is stored even when the instrument is switched off.
OPTION 1
2 wire lead
set
OPTION 2
Switched
probe
BLACK
BLACK
RED
PROBE
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