OPERATING INSTRUCTIONS :
INSTALLATION :
When unpacking the instrument, inspect for any damage during transit. Any such damage
should immediately be intimated to the factory for appropriate action.
The instrument is light weight and portable and does not require any permanent
installation. Before connecting to the mains supply, it should be ensured that the mains voltage is
between 200 to 240 volts a.c. and a
good earth connection is available in the power socket.
OPERATING INSTRUCTIONS :
1.
Ensure that the Main's switch is in 'OFF' position. Connect the instrument to a three pin
well earthed
main's point.
2.
Switch 'ON' the instrument. Allow one minute for warm up, stabilisation of components
and circuits.
3.
Using 'Zero adj' adjust the panel meter reading to zero.
4.
Connect the coaxial cable to the source and select appropriate range.
PRECAUTIONS :
1.
The instrument should be placed as near to the source as possible. This will minimise
current leakage paths, noise pick-ups and capacitive loading.
2.
Use only the best quality coaxial cable with amphenol connectors at both ends. Cable
system should be made as rigid and vibration free as possible, since cable movement can
cause various noise signals, which are significant in the high impedance systems.
3.
Many instrumentation situations, such as flame detectors in gas chromatographs, involve
measurement of low level currents from high voltage sources. If the source is not current
limited it requires input protection. All that is required is a resistor in series with the
affected input terminal so that the maximum overload current is 0.5 mA (for example
200 K ohms for a 100 volt overload). The instrument is protected for 200 volts and a
suitable series resistor should be added in the source circuit for additional voltage of the
source. This will not cause any significant reduction in the performance.
4.
Please note that the instrument is essentially designed for very low current measurement
from high impedance source. Measurement of currents from comparative low impedance
source may require zero adjustment even at higher ranges. This may be checked and
corrected if necessary, for a particular load.
