Instruction Manual for Model 8112 BNC
INTRODUCTION
Model 8112BNC is a small sized, high sensitivity clamp – on AC current probe
designed for use with an oscilloscope. The differential coil incorporated permits
a wide range of current measurements with the minimum effect of the external
magnetic field. Jaws can be opened or closed simply by sliding the knob.
Three current ranges can be switch selected.
SPECIFICATIONS
Range Switch
Position
200mA/200mV
(1mA/mV)
2A/200mV
(10mA/mV)
20A/200mV
(100mA/mV)
Output Impedance – 2k ohms
Input Output Accuracy
0-0.5A AC 0-500mV AC
0-1A AC 0-1000mV AC
0-20A AC 0-2000mV AC
0-20A AC 0-200mV AC
20-40A AC
40-80A AC
200mV-400mV
AC
400mV-800mV
AC
2% of output
0.2mV
4% of output
0.4mV
1% of output
0.2mV
1.5% of
output 0.2mV
1% of output
0.1mV
1.5% of
output 0.2mV
2.5% of
output
2.5% of
output
Frequency
Range
100Hz-1kHz
50Hz-10kHz
40Hz-1kHz
1kHz-10kHz
40Hz-1kHz
1kHz-10kHz
50Hz-10kHz
100Hz-10kHz
Size of conductor under test
8mm maximum
Output cord
Approx. 1.5mm long coaxial cable with a connector
Accessory
Pouch
MEASUREMENT METHOD
(1) Jaws (2) Knob (3) Range Selector (4) Connector
Fig.1
(1) Connect the connector (4) of the adaptor to the vertical input terminal
of the oscilloscope.
(2) Slide the knob (2) backward to open the jaws and clamp on a current
carrying conductor (refer to Fig.2). In example (a), output voltage
selected by the range selector will be obtained. In case of (b), output voltage
twice the value selected by the range selector will be obtained since two
turns of the conductor is clamped as illustrated.
(3) Arrow mark on the jaws indicates polarity relative to the current flowing
through the conductor. When the current flows in the arrowed direction, output
will be positive (+).
(4) Select a desired range according to the current flowing through the conductor.
(5) Where the current waveform is affected by noise, clip the earth lead onto
the earth terminal of the probe and connect it to the circuit under test.
Frequency Characteristics – Within 3dB at 30Hz to 100kHz
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(a) (b)
Model-8112BNC Model-8112BNC
i
E
R
i
E
R
IN S T R U CT I O N M A N U AL
Fig.2
CAUTION
(1) Though the maximum voltage of the circuit under test is specified as
CAT .100V when the jaws are closed, sufficient precaution
should be taken not to bring the conductive portion of the jaws (jaw tips)
into contact with a bare conductor under measurement.
(2) When the jaws are not fully closed, measurement errors will result.
(3) Reading will be affected by the strong external magnetic field when
measurement is taken in its proximity, to minimize this effect, change the
position or orientation of the jaws when making current measurement.
11/2005 92-1821
f o r
M O D E L 811 2 BNC
KYORITSU ELECTRICAL INSTRUMENTS WORKS, LTD
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