17
To avoid possible damage to the Meter or to the equip-
ment under test, check the Meter’s fuses before measur-
ing current. Use the proper terminals, function, and range for
your measurement.
Never place the probes across (in parallel with) any
circuit or component when the leads are plugged into the
current terminals.
When measuring current, the Meter acts like a impedance
such as 5Ω at AC/DC mA (0.005Ω at DC / AC A) in series
with the circuit.
This loading effect of the Meter can cause measurement
errors, loading effect error, especially in low impedance
circuits.
For example : To measure a 5Ω impedance circuit at DC / AC
mA range will cause a –50% measuring error. The error per-
centage of the loading effect of the Meter is expressed as
following :
Caution
- 5Ω
Zcircuit + 5Ω
% 100 x
or
- E
Burden
E
S
% 100 x
E
S
I
m
Z
Circuit
E
Burden
AMMETER SHUNT
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