IM CL235
13
5. Specifications
Instrument Specifications
●
Measuring Ranges and Accuracy (at 23±5°C, 45 to 75% relative humidity)
DC Current
A
Measuring Range (Auto-ranging)
Accuracy
0 to 399.9A
150 to 1000A
±1.0% rdg ±5dgt
Auto-ranging
Lo : 0 to 399.9A (Shifts to Hi at 399.9A)
Hi : 150 to 1000A (Shifts to Lo at 150A. At 1020A or above, "OL" is shown.)
AC Current
A (Crest factor (CF): 3.0)
Measuring Range (Auto-ranging)
Accuracy
0 to 399.9A
150 to 600A
±1.5% rdg ±5dgt (50/60Hz)
±3.5% rdg ±5dgt (40 to 1kHz)
Conversion method : AC coupled, true rms responding, calibrated to the rms
Auto-ranging
Lo : 0 to 399.9A (Shifts to Hi at 399.9A)
Hi : 150 to 600A (Shifts to Lo at 150A. At 620A or above, "OL" is shown.)
DC Voltage
V (Input impedance: 2M
Ω
)
Measuring Range (Auto-ranging)
Accuracy
0 to 39.99V
15.0 to 399.9V
150 to 600V
±1.0% rdg ±5dgt
Auto-ranging
Lo : 0 to 39.99V (Shifts to Mid at 39.99V)
Mid : 15.0 to 399.9V (Shifts to Lo at 15.0V and to Hi at 399.9V)
Hi : 150 to 600V (Shifts to Mid at 150V. At 620V or above, "OL" is shown.)
AC Voltage
V Input impedance: 2M
Ω
(Crest factor (CF): 3.0 or less)
Measuring Range (Auto-ranging)
Accuracy
0 to 39.99V
15.0 to 399.9V
150 to 600V
±1.5% rdg ±5dgt (50/60Hz)
±3.5% rdg ±5dgt (40 to 1kHz)
Conversion method : AC coupled, true rms responding, calibrated to the rms
Auto-ranging
Lo : 0 to 39.99V (Shifts to Mid at 39.99V)
Mid : 15.0 to 399.9V (Shifts to Lo at 15.0V and to Hi at 399.9V)
Hi : 150 to 600V (Shifts to Mid at 150V. At 620V or above, "OL" is shown.)
14
IM CL235
Resistance
Ω
Measuring Range (Auto-ranging)
Accuracy
0 to 399.9
Ω
150 to 3999
Ω
±1.0% rdg ±5dgt
Auto-ranging
Lo : 0 to 399.9
Ω
(Shifts to Hi at 400.0
Ω
)
Hi : 150 to 3999
Ω
(Shifts to Lo at 150
Ω
. At 3999
Ω
or above, "OL" is shown.)
Continuity Check
Measuring Range
Accuracy
0 to 399.9
Ω
±1.0% rdg ±5dgt
The buzzer beeps when the resistance is 20
Ω
or less.
Frequency
Measuring Range
Accuracy
10 to 3000Hz
±1.5% rdg ±5dgt
IM CL235
15
*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.
Waveform
Effective
value
Average
value
Conversion
factor
Reading
errors for
average
sensing
instruments
Crest factor
*CF(Crest Factor) is found by dividing the peak value by the effective value.
Examples:
DC: CF=1
Sine wave: CF=1.414
Square wave with a 1:10 duty ratio: CF=3
16
IM CL235
General Specifications
●
Operating System : Dual integration
●
Measurement Function : AC current, DC current, AC voltage, DC voltage,
resistance, continuity check, frequency
●
Display : Liquid crystal display with maximum counts of 3999
●
Overrange Indication : "OL" is shown on the display
●
Response Time : Approx. 2 seconds.
●
Sample Rate : Approx. 3 times per second.
●
Temperature and Humidity for Guaranteed Accuracy : 23°C ±5°C, relative
humidity up to 75% without condensation
●
Operating Temperature and Humidity : 0 to 40°C, relative humidity up to
90% without condensation
●
Storage Temperature and Humidity : -10 to 50°C, relative humidity up to
75% without condensation
●
Effect of conductor position : Within 2% difference between maximum and
minimum values to a 10 mm-dia conductor, at every part inside the jaws
●
Power Source : 6F22 or 6LR61 9V battery
●
Battery Life : Approx. 15 hours (continuity)
●
Current Consumption : Approx. 15mA max.
●
Sleep function : Automatically powered down in Approx. 30 minutes after
the last switch operation (power consumption : Approx. 20
µ
A)
●
Withstanding Voltage : 5500V AC, 50/60Hz for 1 minute between electrical
circuit and housing case or metal part of the jaws
●
Insulation Resistance : 10M
Ω
or greater at 1000V between electrical circuit
and housing case or metal part of the jaws
●
Conductor Size : Approx. 33mm diameter max.
●
Dimensions : Approx. 91(W) x 208(H) x 40(D) mm
●
Weight : Approx. 450g (with battery)
●
Safety Standard : IEC61010-1:1995
IEC61010-2-032:1994
AC/DC 600V CAT III, Pollution degree 2, indoor use
●
EMC Standard : BS EN 55022:1995
●
Radiation immunity : IEC801-3:1993
●
Accessories : Test leads Model 98010 ············ 1set
6F22 or 6LR61 battery ·············· 1
Carrying case Model 93032 ······ 1
User’s Manual ··························· 1
●
Optional Accessories : Clamp adapter Model 99025