6
．
HOW TO MAKE MEASUREMENT
6-1 Current Measurement
#
DANGER
●
In order to avoid possible shock hazard, never make
measurement on circuits with a maximum voltage difference
of 600V or greater between conductors (300V or greater
between a conductor and ground).
●
Do not make measurement with the test leads connected to
the circuit under test.
●
Never make measurement with the battery compartment cover
removed.
●
Keep your fingers and hands behind the barrier during
measurement.
●
To avoid electrical shock by touching the equipment under test
or its surroundings, be sure to wear insulated protective gear.
#
CAUTION
●
When handling the clamp sensor, exercise caution not to apply
excessive shocks or vibration to the sensor.
●
Maximum measurable conductor size is 12mm in diameter.
Note:
◇
Make sure that the test leads are in the holster while
making current measurement.
◇
Instrument can show the value over 120A, but the safe and
proper measurement range is limited lower than 120A.
6-1-1 DC Current Measurement
(1) The Function Selector Switch to the "60A" or "120A" position.
("AC" marks are shown on the top of the display.)
(2) Press the
SEL
Button. " " mark is shown on the display.
(3) Press the A ZERO ADJ Button to set the reading of the
instrument to zero.
(Incorrect zero adjustment makes measurement errors.)
(4) Adjust one of the conductors to the center of the clamp
sensor's arrow.
( When the position of the conductor is not at the center of
the arrow, the error occurs.)
Measured value is shown on the display.
Note:
◇
The direction of current is plus(+) when the current
flows from the upside (A ZERO ADJ. Button side) to the
underside The direction is minus(-) when the current flows
from the underside to the upside.
◇
Minus "-" mark is shown at the left side of the value and
the bar graph while making minus current measurement.
◇
By changing the function switch 60A or 120A to the other
position, the AC/DC mode is reset to the default (AC
mode). To set the DC mode, press the
SEL
Button again.
◇
The zero adjustment is effective only for the current
measurement.
◇
After the zero adjustment the instrument operates as
follows.
(1) The bar graph disappears.
(2) The maximum counts is changed according to the
adjusted value.
(ex.) The maximum count is 6039-100=5939, when
ad100 counts to zero.
(3)
△
mark is shown on the display.
(4) Pressing A ZERO ADJ. Button again or
SEL
Button, or
changing the function switch releases zero adjustment
function when the zero adjustment is effective.
◇
Pressing the A ZERO ADJ button over 2 sec releases the
zero adjustment function.
6-1-2 AC Current Measurement
(1) Set the Function Selector Switch to "60A." or "120A".
(" " mark is shown on the top of the LCD.)
(2) Adjust one of the conductors to the center of the clamp
sensor's arrow.
( When the position of the conductor is not at the center of
the arrow, the error occurs.)
Measured value is shown on the display.
Note:
◇
Unlike DC current measurement, zero adjustment is not
necessary. There is not polarity indication either.
6-2 Voltage Measurement
#
DANGER
●
In order to avoid possible shock hazard, never make
measurement on circuits with a maximum voltage difference
of 600V or greater between conductors (300V or greater
between a conductor and ground).
●
Do not make measurement with the battery compartment
cover removed.
●
Keep your fingers and hands behind the barrier during
measurement.
Note:
◇
Make sure that the clamp sensor is in the holster while
making voltage measurement.
◇
Instrument may show the value over 600V, but the safe
and proper measurement range is limited lower than 600V.
6-2-1 DC Voltage Measurement
(1) Set the Function Selector Switch to " ".
(" " mark is shown on the LCD.)
(2) Short-circuit the tips of test leads to make the indication zero.
(3) Connect the red test lead to the positive (+) side of the circuit
under test and the black test lead to the negative (-) side.
Measured voltage value is shown on the display.
When the connection is reversed, "-" is shown on the display.
6-2-2 AC Voltage Measurement
(1) Set the Function Selector Switch to " ".
(" " mark is shown on the LCD.
）
(2) Connect the test leads to the circuit under test.
Measured voltage value is shown on the display.
Note:
◇
The displayed value might be few digits instead of zero
even if shorting the test leads.
6-3 Resistance Measurement
#
DANGER
●
Never make measurement on circuits that are live.
●
Never make measurement with the battery compartment cover
removed.
●
Keep your fingers and hands behind the protective fingerguard
during measurement.
(1) Set the Function Selector Switch to "
".
(2) Press the
SEL
Button and "
Ω
" mark is shown and " " mark
is not shown on the display (Resistance Measurement).
Immediately after setting the Function Selector Switch to
"
", is not necessary to operate the
SEL
Button.
(3) Check that the display shows " ". Short the test leads and
check that the display reads about zero.
(4) Connect the test leads to the circuit under test. Measured
resistance value is shown on the display.
Note:
◇
When the test leads are shorted, the display may read a small
resistance value. This is the resistance of the test leads.
◇
If there is an open in either of the test leads, " " is
shown on the display.
◇
The capacitive factor of the tested circuit may cause the
fluctuation of the measurement value, while making the
resistance measurement of high value .
◇
Make sure that the clamp sensor is in the holster while
making resistance measurement.
Adjust a
conductor to
the center of
the arrow.
Correct
Incorrect
Conductor
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