PROF DT-9331 Instruction Manual page 6

Once voltage is applied to the measuring instrument,press the HOLD
buttom, the LCD and LEDs display shows the recoarded reading.
To delete the recorded value,press the HOLD button once again.the LCD and
LEDs display once again indicates the voltage currently being applied to the
probe tips.
5.3 Single-pole phase Test
The single-pole phase test is only possible when batteries are installed and
in good condition.
The single-pole phase test starts at an AC voltage of approx.100V
(pole>100V AC).
When using single-pole phase tests to determine external conductors
the display function may be impaired under certain conditions (e.g. for
insulating body protective equipment on insulation locations).
The single-pole phase testing is not appropriate to determine whether a
line is live or not. For this purpose, the double-pole voltage test is always
required.
Connect both test probes with power source.
A signal sound indicates the phase.
The " " LED is illuminated in the display.
5.4 Continuity Test
The continuity test test is only possible when batteries are installed and
in good condition. A signal sound is audible for continuity and the LED for
continuity LED (6) is illuminated.
5.5 Voltage Test with Switched Load, RCD Trip Test
During voltage tests, you can decrease the interference voltages from
inductive or capacitive coupling by loading the UUT with a lower impedance
than the Tester has in normal mode. In systems with RCD circuit breakers,
you can trip an RCD switch with the same low impedance as when you
measure voltage between L and PE.
To do an RCD trip test during voltage measurement, push the two low
imdedance buttons (14)at the same time. If you have 10 mA or 30 mA RCDs
between L and PE in a 230 V system, it will trip.
During load current,the low imdedance LED is the indication for the
flowing load current. This indication is not to be used for voltage test or
measurement.
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If the two pushbuttons are not used, the RCDs will not trip, even in
measurements between L and PE.
5.6 Resistance Test
The Tester measures low ohm resistances between 1Ω and 1999Ω at a
resolution of 1Ω.
To do a resistance test:
Do a Voltage test to make sure the UUT (unit under test) is not live.
Push and hold the measurement point illumination button (15) for 2
seconds .
Connect the two test probes with the UUT and read value on the display.
Push and hold the measurement point illumination button (15) for 2
seconds to turn the function off.
To save battery power the function automatically.
5.7 Rotary Field Indication
The voltage testers are equipped with a double-pole rotary field indicator.
The rotary phase indication is always active. The symbols "R"or "L" are
always displayed. However, the rotary direction can only be determined
within a three-phase system. Here, the instrument indicates the voltage
between two external conductors.
Connect the instrument test probe with
the supposed phase L2 and the handle
test probe with the supposed phase L1.
The voltage and the rotary field direction
are displayed.
"R" signifies that the supposed phase L1
is the actual phase L1 and the supposed
phase L2 is the actual phase L2.
"L" signifies that the supposed phase L1
is the actual phase L2 and the supposed
phase L2 is the actual phase L1.
When re-testing with exchanged test probes theopposite symbol has to be
illuminated.
L2 L3
N
L1
PE
L3
L2
N
L1
PE
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