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Simpson 270 Series - Page 44

Simpson 270 Series
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4.14
4.15
Operation
DIRECT
CURRENT
MEASUREMENT
WARNING
DO
NOT
CHANGE
THE
RANGE
SETTING
OF
THE
RANGE
OR
FUNCTION
SWITCHES
WHILE
THE
CIR-
CUIT
UNDER
MEASUREMENT
15
ENERGIZED.
NEVER
DISCONNECT
THE
TEST
LEADS
FROM
THE
CIRCUIT
UNDER
MEASUREMENT
WHILE
THE
CIR-
CUIT
IS
ENERGIZED.
ALWAYS
TURN
THE
CIRCUIT
POWER
OFF
AND
DIS-
CHARGE
ALL
THE
CAPACITORS
BEFORE
SETTING
THE
SWITCHES
OR
DISCONNECTING
THE
LEADS.
NEVER
EXCEED
THE
CIRCUIT-TO-GROUND
VOLT-
AGE
OF
THE
INSTRUMENT
(1000
V
MAX.,
TABLE
1-1,
ITEM
16).
ALWAYS
CONNECT
THE
INSTRUMENT
IN
SERIES
WITH
THE
GROUND
SIDE
OF
THE
CIRCUIT.
DIRECT
CURRENT
MEASUREMENT
0-50,A
RANGE
a.
Set
the
function
switch
at
+
DC.
b.
Plug
the
black
test
lead
into
the
—
COMMON
jack
and
the
red
test
lead
into
the
--504АМР5/250тУ
jack.
с.
Set
the
range
switch
at
50uAMPS
(dual
position
with
SOV).
d.
Turn
power
OFF.
Then
discharge
any
capacitors
in
the
circuit.
e.
Open
the
ground
side
of
the
circuit
in
which
the
current
is
being
measured.
Connect
the
VOM
in
series
with
the
circuit.
Connect
the
red
test
lead
to
the
positive
side
and
the
black
test
lead
to
the
negative
side.
4-18

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