#
WARNING
●
Never attempt to make any measurement, if any abnormal
conditions are noted, such as broken case, cracked test leads
or Clamp Sensor Cable and exposed metal parts or internal
wiring.
●
Do not turn the Function Selector Switch while the test leads
are connected to the circuit under test.
●
Do not install substitute parts or make any modification to
the instrument. Return the instrument to Kyoritsu or your
distributor for repair or re-calibration.
●
Do not try to replace the batteries if the surface of the
instrument is wet.
●
Always disconnect the clamp sensor and the test leads
from the circuit under test and switch off the instrument
before opening the battery compartment cover for battery
replacement.
●
A cap is provided on the tip of a test lead. Use a test lead with
the cap on for safety.
●
Stop using the test lead if the outer jacket is damaged and the
inner metal or color jacket is exposed.
#
CAUTION
●
Make sure that the Function Selector Switch is set to an
appropriate position before making measurement.
●
Always make sure to place the test leads in the holster before
making current measurement.
●
Do not expose the instrument to the direct sun, extreme
temperatures or dew fall.
●
This instrument isn't dust & water proofed. Keep away from
dust and water.
●
Be sure to set the Function Selector Switch to the "OFF"
position after use. When the instrument will not be used for
a long period of time, place it in storage after removing the
batteries.
●
Use a damp cloth and detergent for cleaning the instrument.
Do not use abrasives or solvents.
●
Keep your fingers and hands behind the protective fingerguard
during measurement.
2
．
FEATURES
●
Permits AC/DC current measurement up to 120A using a
clamp sensor that comes standard with the instrument
●
Clamp sensor for ease of use in crowded cable areas and
other tight places
●
Permits current measurement with an open current-clamp sensor
that does not require opening and closing operations by the user
●
True-RMS measurements ACV and ACA.
●
Auto-power-save function
●
Buzzer for easy continuity checking
●
Data hold function to freeze the readings
●
LCD with a bar graph
●
Shock absorbing holster for ease of storage
●
Designed to international safety standard IEC61010-1: over-voltage
category CAT III 300V, CAT II 600V and pollution degree 2.
[ Effective Value (RMS) ]
Most alternating currents and voltages are expressed in
effective values, which are also referred to as RMS (Root-Mean-
Square) values.
The effective value is the square root of the average of square
of alternating current or voltage values. Many clamp meters
using a conventional rectifying circuit have "RMS" scales for AC
measurement. The scales are, however, actually calibrated in
terms of the effective value of a sine wave though the clamp
meter is responding to the average value. The calibration is
done with a conversion factor of 1.111 for sine wave, which
is found by dividing the effective value by the average value.
These instruments are therefore in error if the input voltage or
current has some other shape than sine wave.
[ CF (Crest Factor) ]
CF (Crest Factor) is found by dividing the peak value by the
effective value.
Examples: Sine wave: CF=1.414
Square wave with a 1: 9 duty ratio: CF=3
Waveform
Crest factor
CF
Average value
Vavg
Effective value
Vrms
Conversion
factor
Vrms/ Vavg
Reading errors for
average sensing
instrument
≒
0.637
≒
1.111
≒
1.414
≒
1.155
≒
1.732
＝
-3.8
％
×
100
％
＝
11.1
％
≒
0.707
2
1
2
2
π
A
3
D
1
3
2
D
1
3
A
0.5A
×
1.111-
3
A
A
A
A
A
1
0.5A
1
0
％
2 A
π
＝
AD
f
A
＝
A
・
D
T
2
A
A
×
1,111-A
×
100
×
100
D
A
D
1
＝
A
D
A
（
1.111
-1
）
D
A
0
A
0
A
0
A
0
T
D=f/T
f
3
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