Simpson 260 - Measuring Direct Currents, 50 Microamperes to 500 Milliamperes

OPERATING INSTRUCTIONS
MEASURING DIRECT CURRENTS,
1.
2,
3.
he
5e
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26
50 MICROAMPERES TO 500 MILLIAMPERES
Set the function switch at +D.C.
Connect the black test lead in the CCMMON-
jack and the red test lead in the + jack.
Set the range switch in any of the four range
positions required. These are marked 1 MA.,
10 MA., 100 MA., and 500 M4. When in doubt
as to the current flowing, always select the
highest range initially.
Open the circuit which is to be measured and
connect the meter in series. Connect the red
test lead toward the positive side and the
black test lead toward the negative side.
Turn on the power in the circuit. Observe
the meter. If the pointer is deflected to
the left, the current polarity is opposite
to that which was anticipated. Turn off the
power, set the function switch to -Dee and
restore the power.
Read the current directly on the black D.C.
scale arc.
For the 1 MA, range use the O-1C figures
and divide by 10.
For the 10 MA. range use the C-10 figures
directly.
For the 100 MA. range read the 0-10
figures and multiply by 10.
For the 500 MA, range read the 0-50
figures and multiply by 10.
The current values are in milliamperes.
Turn off the circuit power. Remove the test
leads and restore circuit continuity.