4. OPERATION
DC CURRENT MEASUREMENTS
a. Set the range selector switch to one of the 4 positions shown in Fig. 3. If in doubt as to
range to be used, first select the highest available range.
b. Set the function switch to “DC”.
c. For current
less than 1.5Amps
, connect red marked lead into the “+” jack.
Connect the black marked lead to the “COM (-)”.
d. For current
greater than 1.5 Amps
, connect the red marked lead into either the 30A
or 6A jack. Connect the black marked lead into the “AMPS” jack.
e. Turn off power in the circuit to be measured.
f. Connect test leads in series with the circuit to be measured, with the red )
lead to the positive side of the opened circuit.
g. Turn on power. If necessary to change jack connections for a more suitable range,
first turn off the power and discharge circuit capacitors, if any.
h. Use 0-15 DCA (Blue) or 0-15 DCMA (Black) scale for the DC current readings.
i. Turn off circuit power and discharge capacitors, if any, before disconnecting test leads.
Figure 3. Measuring DC Current
Note:
The range switch position for DC serves the 1.5A,
6 A and 30 A ranges, and the correct jack must be selected.
The 6A and 30A connections are unfused.
Use caution when testing these high currents.
Do not leave the unit measuring 30 Amps unattended, or for a long
period of time as contact points can overheat rapidly.
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