Carrying Out Measurements; Voltage Measurement; Current Measurement; Resistance Measurement - Monacor DMT-2570 Manual De Instrucciones

5 Carrying out Measurements

Measurements of objects which carry more than
B
42 V must only be made by persons able to recog-
nize a hazard of contact and to take corresponding
safety precautions. In case of measurements with
hazard of contact avoid working on your own. Ask a
second person to assist.
To start with the measurement, adjust the highest
measuring range. Then for a high accuracy, switch
down to the smallest possible range (e. g. measure
15 V in the 20 V range and not in the 200 V range). If a
measuring range is exceeded, the unit signalizes "1" or
"-1". In this case select the next higher range.
Below the decimal point the value is displayed
which can max. be measured in the selected range.
However, in the ranges "hFE" and "°C" this indication is
not shown.

5.1 Voltage measurement

Take into account unexpected voltages at test ob-
jects. For instance, capacitors may be dangerously
charged even if the voltage source is switched off.
With this meter no measurements in current circuits
with corona discharges (high voltage) must be car-
ried out. Danger of life!
The voltage max. to be measured must not exceed
1000 V or 700 V~. Otherwise there is danger of
life!
1) Connect the red test lead to the red jack "VΩHz"
(10) and the black test lead to the black jack "COM"
(9). Do not accidentally use one of the two jacks for
current measurement (7 or 8) under any circum-
stances! The meter and the voltage source may be
damaged.
2) In case of AC voltages set the range switch (5) to
one of the ranges "V~", in case of DC voltages to
one of the ranges "V ".
3) Hold the test tips to the test object or to the measur-
ing points, and read the measuring value on the dis-
play.
4) In case of DC voltage measurements with the nega-
tive pole at the red test tip and the positive pole at
the black test tip, the displayed measuring value is
preceded by a minus sign.

5.2 Current measurement

The current max. to be measured must not exceed
10 A.
The 10 A measuring current circuit is not fused. Be
especially careful in this case.
If the red test lead is connected to one of the two
jacks for the current measurement (7 or 8), do not
feed any voltage to the meter in any case. The
meter and the voltage source may be damaged.
1) Connect the black test lead to the black jack "COM"
(9). In case of measurements above 200 mA
connect the red test lead to jack "A" (7) and set the
range switch (5) to position "10" of the ranges "A "
or "A~".
For measurements up to 200 mA connect the red
test lead to jack "mA" (8) and set the range switch (5)
at first to position "200m" of the ranges "A " or "A~".
2) Open up the current circuit to be measured and
connect it with the meter. Only measure for a very
short time (max. 15 s) in the 10 A range, otherwise
the measurement will be inaccurate due to the inter-
nal heating-up.
3) In case of DC current measurements with the nega-
tive pole at the red test tip and the positive pole at
the black test tip, the displayed measuring value is
preceded by a minus sign.
4) If no current measurement is possible except in the
two 10 A ranges, check the fuse and replace it, if
necessary – see chapter 6 "Replacing of Battery or
Fuse".

5.3 Resistance measurement

Do not measure in any case within a circuit if it car-
ries a voltage. The meter may be damaged.
A resistor should always be measured separately,
otherwise the measurement will be inaccurate. If
necessary, if must be soldered out of the circuit.
1) Connect the red test lead to the red jack "VΩHz"
(10) and the black test lead to the black jack
"COM" (9).
2) Set the range switch (5) to one of the ranges "Ω".
3) Hold the test tips at the resistor or the correspond-
ing measuring points, and read the measuring
value on the display.
4) In the 200 MΩ range the value "1.0" is displayed
with short-circuited test tips. This value must be
deducted from the measuring result.
Example:
151.0 (reading value) - 1.0 (correction) = 150.0 MΩ
(actual value)

5.4 Continuity check

Do not measure within a circuit in any case if it car-
ries a voltage. The meter and the test object may be
damaged.
1) Connect the red test lead to the red jack "VΩHz"
(10) and the black test lead to the black jack
"COM" (9).
2) Set the range switch (5) to position
3) Hold the test tips at the corresponding measuring
points. If the (transition) resistance between both
measuring points is below 50 Ω, the continuity buz-
zer will sound.
GB
.
9