92―1509A
04―12
DISTRIBUTOR
Kyoritsu reserves the rights to change specifications or designs
described in this manual without notice and without obligations.
3-phase 3-wire system
(In 4-wire system with neutral,
clamp onto all 4 wires)
Single-phase 2-wire system
(in 3-wire system with neutral,
clamp onto all 3 wires)
Load
Load
6. OPERATING INSTRUCTIONS
DANGER
●In order to avoid possible shock hazard, never make measurement
on circuits having a potential of 300VAC or greater.
●The transformer jaws are made of metal and their tips are not
completely insulated. Be especially careful about the possible
shorting where the equipment under test has exposed metal parts.
●Never make measurement with the battery compartment cover
removed.
●Keep your fingers and hands behind the barrier during
measurement.
CAUTION
●Take sufficient care to not to apply shock, vibration or
excessive force to the jaw tips. Otherwise, precisely adjusted
Transformer Jaw tips will be damaged.
●When a foreign substance is stuck in the jaw tips or they
cannot properly engage, the transformer jaws do not fully
close. In such a case, do not release the jaw trigger abruptly or
attempt to close the transformer jaws by applying external
force. Make sure that the jaws close by themselves after
removing the foreign substance or making them free to move.
●The maximum size of a conductor to be tested is 28mm in
diameter. Accurate measurement cannot be made on a
conductor larger than this, because the transformer jaws
cannot fully close.
●When measuring large current, the transformer jaws may buzz.
This has no effect on the instrument's performance or safety.
6-1 Leakage Current Measurement
(1)Set the Range Selector Switch to the desired position. Current
to measure should be within the selected measuring range.
(2)Measuring out of balance leakage current (See Fig.1):
Clamp onto all conductors except a grounded wire. Measured
current value is shown on the display.
(3)Measuring earth leakage current (See Fig.2):
Clamp onto a grounded wire.Measured current value is shown on
the display.
Fig. 1 Measuring out of balance leakage current
6-2 How to Use Frequency Selector Button
When high frequencies from such equipment as inverters are
present in the circuit under test, the instrument measures AC
current of not only 50Hz or 60Hz of fundamental frequency but also
of these high frequencies and harmonics.
To eliminate the effect of such high frequency noise and measure
AC current of 50Hz or 60Hz fundamental frequency, a "high-cut"
filter circuit in incorporated into the instrument which works when
"50/60Hz" frequency response is selected with the Frequency
Selector Button. Cut-off frequency of the "high-cut" filter is about
160Hz with attenuation characteristic of approx. -24dB/octave.
When the Frequency Selector Button is pressed, "50/60Hz" mark is
shown on the left side of the display. When the Frequency Selector
Button is pressed again, frequency response is switched to WIDE
with "WIDE" mark shown on the display.
Note:
Characteristic of -24dB/octiave means that signal magnitude
declines to about one sixteenth of that at the initial frequency when
frequency doubles. KEW SNAP 2434 have the following two
settings for the Frequency Selector Button.
WIDE (40Hz-): Permits measurement of currents of fundamental
frequencies as well as currents of high frequencies
generated by such equipment as inverters
50/60Hz (40-approx.160Hz): Filters out high frequency currents and
measures current of fundamental
frequency only
Fig.3 KEW SNAP 2434 Frequency Characteristic
Output characteristic are shown in Fig.3.
;;;;
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;;;;
;;;;
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100％
50％
20％
10％
5％
5ｋ
1ｋ 2ｋ
500
100 200
50
20
10
ー30
ー20
ー10
0
Attenuation〔dB〕
10
Frequency〔Hz〕
Percentage
Typical characteristic：
400mA/４A Range
Typical characteristic：
WIDE frequency response
Typical characteristic：
50/60Hz frequency response
high-cut filter -24dB/oct
Typical characteristic：
100A Range
Fig.2 Measuring earth leakage current
Load
Grounded wire
Recently there has been increased use of power through inverters,
switching regulators, etc. When the high frequency noise from such
appliances leaks or flows into the ground through capacitors not
filtering completely, the earth leakage breaker may trip even though
there is no "actual" leakage. In such a case, the instrument do not
give leakage current reading if "50/60Hz" frequency response is
selected.
Take current readings with the 50/60Hz and WIDE frequency
responses respectively to make effective use of the Frequency
Selector Button.
6-3 Load Current Measurement
(1)Set the Range Selector Switch to the desired position. Current to
measure should be within the selected measuring range.
(2)Measuring load current (See Fig.4):
Press the jaw trigger to open the transformer jaws and close
them over one conductor only.Measured current value is shown
on the display.
7. OTHER FUNCTIONS
7-1 Sleep Function
This is a function to prevent the instrument from being left powered
on in order to conserve battery life.
The instrument automatically enters the Sleep (powered-down)
Mode about 10 minutes after the last switch operation.
To exit the Sleep Mode, press the Data Hold or Frequency Selector
Button or turn the Range Selector Switch to OFF, then to any other
position.
How to Exit the Sleep Mode:
Turn the Range Selector Switch from
OFF
to another position
with the Data Hold Button pressed. Then,
P.OFF
is shown on
the display. This disables the Sleep function and enables
continuous use of the instrument.
To enable the Sleep function, turn the Range Selector Switch back
to
OFF
, then to any other position.
Note:
The instrument consumes small amount of current in the Sleep
Mode. When the instrument is not in use, make sure to set the
Range Selector Switch to
OFF
.
7-2 Date Hold Function
This is a function to freeze the readings on the display. When the
Data Hold Button is pressed once, the current reading is held even
though current under test varies. "H" mark is shown on the upper
right corner of the display.
To exit the data hold mode, press the Data Hold Button again.
Note: When the Sleep function works while the instrument is in the
data hold mode, data hold is cancelled.
Fig.4 Measuring load current
Load
8. BATTERY REPLACEMENT
CAUTION
●Do not mix new and old batteries.
●Install batteries in the orientation as shown inside the battery
compartment, observing correct polarity.
●In order to avoid possible shock hazard, always set the Range
Selector Switch to the OFF position before trying to replace the
batteries
When the battery voltage warning mark "BATT" is shown on the
top left corner of the LCD, replace the batteries. Note that the
display blanks and "BATT" mark is not shown if the batteries are
completely exhausted.
(1)Set the Range Selector Switch to "OFF."
(2)Loosen the battery-compartment-cover-fixing screw on the lower
back of the instrument.
(3)Replace the batteries with two new R03 (UM-4) 1.5V
batteries.
(4)Put the battery compartment
c o v e r b a c k i n p l a c e a n d
tighten the screw.
Note: U s e a l k a l i n e b a t t e r i e s t o
perform measuring for long
9. OPTIONAL ACCESSORIES
Model 8004 and 8008 (Multi-Tran)
These models help KEW SNAP 2434 to measure current greater than
1000A or to make measurement on a large bus-bar or conductor.
(1)Set the Range Selector Switch to "100A".
(2)As shown, open the jaws and close them over the pickup coil
of Model 8004 or Model 8008.
(3)Clamp on a conductor with Model 8004 or Model 8008.
(4)Take the reading and multiply it by 10.
Note: Model 8004 and Model 8008 cannot be used for leakage current
m e a s u r e m e n t . F o r d e t a i l e d s p e c i f i c a t i o n s , r e f e r t o t h e
instruction manual for Model 8004 or Model 8008.
KEW2434
M-8004
M-8008
Pickup Coil
Conductor
Transformer
jaws
10
：
１
M-8004
M-8008
Max. Conductor Size
60mm in diameter
100mm in diameter
Measuring
Range
0〜1000A
Current Transformation
Ratio
10:1
Screw
Battery
Compartment
Cover
Batteries
