Measuring Currents - ADInstruments AD71B Manual De Usuario

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less) if the circuit impedance is 10k or less.
z Special care should be taken when measuring high voltage.
z When voltage measurement has been completed, disconnect the connection
between the testing leads and the circuit under test and remove testing leads away
from the input terminals of the Meter.

Measuring Currents

B.
Black Red
Figure 3-2. Currents Measurement
Warning
If the fuse burns out during measurement, the Meter may be damaged or
the operator himself may be hurt.
To avoid possible damage to the Meter or to the equipment under test,
check the Meter's fuses before measuring current. Use proper terminals,
function, and range for the measurement. Never place the testing leads in
parallel with any circuit or component when the leads are plugged into the
current terminals.
To measure AC or DC current, set up the Meter as Figure 3-2 and proceed as follows:
1. Turn off power to the circuit. Discharge all high-voltage capacitors.
2. Insert the red test lead into the mA A or A terminal and black test lead into the
COM terminal.
3. If you are using the A terminal, set the rotary switch to A . If you are using
mA A terminal, set the rotary switch to A for currents below 20000 A , or
mA (UT71A) or mA
4. DC measurement is default, press blue button to select AC measurement.
5. Open the circuit path to be tested. Touch the red testing leads to the more
positive side of the break; touch the black probe to the more negative side of the
bread. Reversing the leads will produce a negative reading, but will not damage
the Meter.
6. Turn on power to the circuit; then read the display.
AC measurement displays the True RMS value.
DC measurement displays the effective value of sine wave (mean value response)
7. Turn off power to the circuit and discharge all high-voltage capacitors. Remove
the Meter and restore the circuit to normal operation.
When a ACA function is selected, you can press the Yellow Button to view the AC +
©Copyright Abacanto Digital SA.
(UT71B) for current above 20000 A.
Manual de usuario AD71B
AD Instruments
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