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Instruction Manual MM850099 ed.02a
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The character generation is by a dedicated secondary microprocessor driven by the bus of the main
microprocessor.
The 16 characters are displayed with a 7 x 5 dot matrix.
4.7
Digital to analog converter
The digital to analog is based on a special reconfiguration of the A/D integrated circuit.
A section of the analog switch and output amplifier are also operative.
4.8
Serial digital interface
The serial digital interface circuit is essentially based on the serial communication interface subsystem
(SCI) on the chip of the microprocessor at 0 to +5V level.
An adaptor to convert TTL to RS 232 voltage levels can be obtained on request.
4.9
Battery charger. Operation from line source.
The auxiliary module, supplied as a standard accessory, allows operation from 110-120 or 220-240 V ac
50/60 Hz.
The calibrator, if needed, can be operated directly from a line source through the charger.
The plastic case of the battery charger incorporates the line voltage plug and cable for connection to the
instrument.
The charger circuit is designed with an insulating transformer and a voltage stabilizer circuit.
The step-down transformer reduces the power line (110-120 Vac or 220-240 Vac nominal) to a value of
10 Vac.
The above voltage is full wave rectified, filtered and stabilized.
The output voltage of 6.45 Vdc is the ideal value to recharge the internal Ni-Cd batteries.