Sanwa EM7000, Instruction Manual, Page: 48 / 68

DRAWING No.EM7000 09-1306 2040 2040
1. Never apply voltage to the
input terminals.
2. Be sure to make a series
connection via load.
3. Do not apply an input
exceeding the maximum
rated current to the input
terminals.
— 44 —
6-6 Current Measurement
WARNING
○ Correct × Incorrect
Power
Load
Power
Load
6-6-1 DCA (DCA ) Maximum measurable current DC 300 mA
1) Objects of measurement
Current that flows in batteries and DC circuits.
2) Measuring ranges (5 ranges) : 0.12 µ/0.3 m/3 m/30 m/300 mA
3) Measurement procedure
0
A
•
V
C
D
Insert the red plug of
test leads into the
+input terminal, and the
black plug into the
–COM terminal.
Turn the function/range
selector to the appropriate
DCA range.
Turn on the power switch
(power ON: Lamp blinks).
Turn the electrical
zero adjuster (ZERO ADJ) to adjust the pointer to the zero
position of black DCV
•
A scales.
Connect the black test pin to the negative potential side of the
circuit to be measured, and the red test pin to the positive
potential side through the load (in series).
Read the indication on the DCV
•
A scales in a unit of µA
(microampere) or mA (milliampere) depending on the range used.
Detach the test pins from the circuit to be measured.
Turn off the power switch (power OFF: Lamp blinking goes off).
In the current measurement, the internal resistance of the current
range is inserted in series in the circuit to be measured, and
therefore the measured value will be smaller than the actual
current value depending on the intensity of internal resistance.
The fuse (500 mA) in this unit shuts off the circuit if a voltage or
current over 500 mA (0.5 A) is applied.
Battery Resistance
(Load)
EM7000_08_英_再校 13.6.10 1:26 PM ページ18