Defort DMM-1000 Instrucciones De Servicio página 9

6. AFTER SALES SERVICE
Please retain the original packing. If the device needs to
be transported again, the risk of damage during transport
is minimised if you use the original packing. If a warranty
claim is made, the device must be sent in as securely
packed as possible, preferably in the original packing. All
products undergo exhaustive testing before they leave
the factory. Should however a defect be detected in your
device, please contact at your Service address ¿ rst.
7. BEFORE PUTTING IN SERVICE
1. In case the voltage and/or the current to be meas-
ured is/are unknown, set the rotary knob on the
largest measuring range. If the accuracy on the
rotary knob is insuf¿ cient, set on a lower range and
soon.
2. If the device is not going to be used temporarily, put
the rotary knob in the OFF position.
3. The switching of the multimeter is different for
measuring voltage and for measuring current.
Parallel connection in voltage measurement and
series connection in current measurement. In the
latter case, a conductor in the power circuit to be
measured must be interrupted.
4. Never connect a power source or voltage to the
multimeter, if the FUNCTION switch is in the Ÿ or
position.
5. Never connect a voltage higher than 1000 V DC or
750 V AC to the measuring device.
8. BRIEF SYNOPSIS FOR MEASUREMENTS
The multimeter is suitable for measuring:
• Direct voltage (VDC, voltage of accumulator or bat-
tery, for example)
• Direct current (ADC)
• Alternating voltage (VAC, voltage of the mains input
of a device, for example)
• Resistance (Ÿ, Ohm)
• Diodes and hFE transistor measurement
• Alternating current (AAC)
• Continuity test
A measurement object can be under voltage. To meas-
ure it, connect the multimeter in parallel.
If the current strength is to be measured, include the
multimeter in the circuit (series connection). The power
circuit for measuring the current must necessarily be
isolated, because the current has to À ow through the
multimeter.
You must not switch the multimeter on Current meas-
urement, for example, if you are measuring the volt-
age. You could damage the multimeter beyond repair
by causing a short circuit in this case.
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9. OPERATION
A. 3,5-digit LCD display (max. display: 1999. Display
of decimal point, polarity, overload and discharged
battery indication.
B. FUNCTION switch: Rotary switch for the range to
beset
C. 20 A. Positive connection for current measurements
over 200 mA up to a maximum value of 20 A.
D. mA. (0-200 mA)
E. COM. Negative connection.
F. VŸ. Positive connection for voltage and resistance
measurements.
10. MEASUREMENTS
10.1 MEASURING DIRECT VOLTAGE (V DC)
1. Connect the BLACK lead to the «COM» connector
socket and the RED lead to the «VŸmA» connector
socket.
2. Set the FUNCTION switch on the desired «V» set-
ting and connect the leads to the voltage source to
be measured or measuring points. Observe correct
polarity (red is + and black is -), otherwise the dis-
play shows a minus sign before the value.
3. Read offthe measured value in Volt.
RANGE ACCURACY
200 mV
2 V
± 0,5% of rdg
± 1 dgt
20 V
20 V
± 0,8% of rdg
1000 V
± 2 dgt
Input resistance 10 MŸ
Overload protection DC 1000 V or AC 750 V
Effective value (outside 200-mV-range with highest
value of 250 V Effective value).
HINT:
1. In case the voltage range is unknown, you must put
the FUNCTION switch in the highest measurement
range and then reduce the range gradually if re-
quired.
2. If the ¿ gure «I» now appears on the display, the
measurand lies outside the range set. The FUNC-
TION switch must be switched to a higher range.
3. The maximum input voltage is 1000 V DC. Higher
voltages cannot be measured.
4. Proceed extremely cautiously with the measure-
ment of high voltages.
10.2 MEASURING ALTERNATING VOLTAGE
(V AC)
1. Connect the BLACK lead to the «COM» connecting
point and the RED lead to the «VŸmA» connecting
point.
2. Set the FUNCTION switch on the desired «V» set-
ting and connect the leads to the voltage source to
be measured or measuring points. The polarity of
the measuring tips is not relevant.
3. Read off the measured value in Volt.
RANGE ACCURACY
2 V
± 0,8% of rdg
20 V
± 3 dgt
200 V
± 1,2% of rdg
750 V
± 3 dgt
GB
RES.
100 V
1m V
10m V
100m V
1 V
RES.
100 V
1m V
10m V
1 V
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