Finest 701 - Page 10

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4 . Turn on power to the circuit and read the display.
5 . After measuring current, turn off power to the circui t and discharge all high-
voltage capacitors . Dis connec t the meter and restore the circuit to normal
o p e r a t i o n .
Tips for measuring current
When measuring a 3-phase system, special at t ention should be taken to the
phase to phase voltage which is significan t ly higher than the phase t o earth
voltage. To avoid exceeding the vol t age rating of the protecti on fus e(s)
accidentally, always consider the phase to phase voltage as the working vol t age
for the protec t ion fuse(s).
When measuring current, the meter’s internal shunt resis t ors develop a vol t age
across the me t er’s terminals called “burden voltage”.
This voltage drop may affect precision circuits or measurements.
Current ( , , ) Measurements
Current is the flow of electrons through a conductor. To measure current, you must
open t he circuit under test, then place the me t er in series with the circuit.
The available current ranges are :
400.0 µA, 4000 µA, 40.00 mA, 400.0 mA, 4.000 A, and 10.00 A
The meter defaults a t d c. Press S E L E C T button momentarily to select a c .
To measure dc o r ac current,
1 . Turn of f power to the circuit and discharge all high-voltage capacitors.
2 . I nser t the black lead into the C O M terminal and the red lead in t o an input
terminal appropriate for t he measurement range as the following table.
To avoid blowing the meter’s 440 mA fuse, use the mAµA terminal only if you are sure the
current is less t han 400 mA.
3 . Open the current path to be tes t ed. Touch the red probe t o the more positive
side of the break and touch the black probe to the more negative side of the
break. (Reversing the leads will produce a negative reading, but will not damage
the meter.)
Warning
Never a t tempt an in-circuit current measurement where the
open-circuit potential to earth is greater than 1000V. You may
damage the meter or be injured if the fuse blows during such
a measurement.
Caution
Check the meter f uses before measuring current. Use the
proper terminals , functi on, and range for c urrent
measurements. Never place the probes in parallel wi t h any
circuit or component when the test leads are plugged into the
current terminals.
Range RangesInput
mAµA
mAµA
10A
400.0 µA, 4000 µA
40.00 mA, 400.0 mA
4.000 A, 10.00 A
SERIES CONNECTION SER I ES CONN E CTION