Hama EM393B Bedienungsanleitung Seite 5

Measuring operation
Never exceed the maximum permitted input values for current and voltage.
Never grip the test prods outside of the grip area identified with tactile markings while
taking a measurement.
Only the two measuring cables required for the respective measuring operation may be
connected to the measuring device. For safety reasons, remove all measuring cables
from the measuring device that are not required.
a) Voltage measurement „V"
Before measuring the voltage, always make sure that the measuring device is not set to
the measuring range for current or resistance.
To measure DC voltages (V
• Switch on the "EM393B" by turning the switch to the largest measuring range (250 V=, DC).
• Plug the measuring cables into the measuring sockets according to the colour coding.
• Connect the two test prods to the object to be measured (battery, circuit, etc.).
• The red test prod corresponds to the positive pole, the black test prod to the negative pole.
• The respective polarity of the measured value together with the actual measured value is
shown on the display.
• Depending on the result, you can now adjust the measuring range by turning the switch.
• If you measure the DC voltage and a minus sign "-" is shown in front of the measured value,
the measured voltage is negative (or the measuring cables are reversed).
• After completing the measuring process, remove the measuring cables from the object to be
measured and switch off the "EM393B" (rotary switch in "OFF" position).
To measure AC voltages (V ~), proceed as follows:
• Put the "EM393B" into operation as described for the measuring of DC voltage and select the
largest measuring range (250 V~, AC).
• Connect the two test prods to the object to be measured (generator, circuit, etc.).
• The measured value is shown on the display.
• Depending on the result, you can now adjust the measuring range by turning the switch.
• After completing the measuring process, remove the measuring cables from the object to be
measured and switch off the "EM393B" (rotary switch in "OFF" position).
b) Current measurement „A"
The maximum permissible voltage must not exceed 250 V.
Measurements above 200 mA may only be carried out for a maximum of 10 seconds and
with a subsequent break of at least 15 minutes between measurements.
To measure direct currents (A
• Plug the red measuring cable into the 10 A measuring socket (blue, for currents >200 mA) or
into the red measuring socket (for currents <200 mA). Plug the black measuring cable into the
COM measuring socket.
• Select the largest measuring range, i.e., 200 mA for low direct currents; for larger currents,
set the selection switch to 10 A.
• Connect the two test prods in series to the object to be measured (battery, circuit, etc.); the
respective polarity of the measured value together with the actual measured value is shown
on the display.
), proceed as follows:
, DC), proceed as follows:
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