Capacitance Measurement And Diode Test; Capacitance Measurement; Frequency Measurement; Current Measurement - Bosch MMD 302 Original Instructions Manual

4.3 Capacitance measurement and
diode test
4.3.1

Capacitance measurement

1. Connect red measuring cable to test input for ca-
pacitance measurement (fig. 1, pos. 12).
2. Turn measurement-mode switch (fig. 1, pos. 8) to the
position.
3. nF appears in the display.
4. Discharge the condenser (capacitor) and connect to
the test probes.
4.3.2 Diode test
1. Connect red measuring cable to test input for diode
test (fig. 1, pos. 12).
2. Turn measurement-mode switch (fig. 1, pos. 8)
to the position, and switch to diode test by
means of the blue function button (fig. 1, pos. 2).
The diode symbol and a voltage value of approx. 3 V
appear in the display.
3. Connect the test probes to the diode as follows:
Connect the black test probe to the cathode and the
red probe to the anode. The measured value now
shown should be between 0.5 V and 0.9 V. If the
displayed value is clearly above or below the quoted
levels, the diode is faulty.
4. Connect the black test probe to the anode and the
red probe to the cathode. The measured value now
shown should be the same as when the test probes
are not connected (approx. 3 V). The diode is faulty
if the measuring device gives a different reading.
4.4

Frequency measurement

1. Connect red measuring cable to test input for volt-
age measurement (fig. 1, pos. 12).
2. Turn measurement-mode switch (fig. 1, pos. 8)
to ADP Hz position, and switch over to frequency
measurement by means of the blue function button
(fig. 1, pos. 2). Hz appears in the display.
Robert Bosch GmbH
Connection and operation | MMD 302 | 21
4.5

Current measurement

!
Always observe the current limit values of the se-
lected measuring range and at the test inputs.
i
In the case of all current measurement ranges, the
blue function button (fig. 1, pos. 2) is used to switch
over from alternating to direct current. In the dis-
play, AC appears for alternating and DC for direct
current.
1. Connect the red cable to the test input for the ap-
propriate measuring range.
2. Turn the measurement-mode switch (fig. 1, pos. 8)
to the desired position.
3. Switch off the power supply to the measure- ment
object and open the current circuit to be measured.
4. Connect the test probes in series with the measure-
ment object.
Currents up to 400 mA
1. Connect red measuring cable to test input for mA
(fig. 1, pos. 10).
2. Turn measurement-mode switch (fig. 1, pos. 8) to
the desired position (4mA, 40mA, 400mA).
Currents from 400 mA to 20 A
!
Currents in excess of 10 A must not be measured for
longer than 30 seconds. A 3-minute measurement
interval must be allowed after this period.
1. Connect red measuring cable to test input for A (fig. 1,
pos. 9).
2. Turn measurement-mode switch (fig. 1, pos. 8) to
position A.
4.6 Possible uses of the protective
rubber cover
4.6.1

Single-handed multimeter

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1 689 979 642 2014-11-03