User's Manual

10
2 GENERAL FEATURES
2.1 Input and output flexibility
Advanced flexibility of performance has been achieved using microprocessor technology. Each instrument, through a
menu-driven procedure, allows measurement or simulation of mV, V, mA, Ω, or any normalized IEC, DIN and JIS
thermoelectric sensor J, K, T, R, S, B, C, U, L, N, E, F, G, D, Pt100, Ni100 and Ni120.
The microprocessor performs automatic polynomial linearization and cold junction compensation to assure high
accuracy. °C or °F selection can be made through a reconfiguration set-up.
2.2 Self calibration
The hardware-firmware design allows an automatic calibration of the instrument. A precision source (from 0 to 10V), a
0°C reference system, a standard resistor of 400Ω (±0.02% accuracy) and an ohmmeter are necessary. The calibration
procedure is protected by a security code.
2.3 Keyboard
A thermoformed metal-click tactile polycarbonate membrane keyboard, with a working life of one million operations per
key, seals the internal electronics from the surrounding environment.
Contact closure of membrane keys is acknowledged, as a coded signal, directly by the microprocessor. Two membrane
slidewires (patent pending) allow operator setting of the simulation value.
2.4 Display
The high contrast alphanumeric LCD display with dot matrix (7x5 dots per character-16 characters) allows easy readings,
even in poor light conditions, and simultaneously indicates the active function (measured or simulated), engineering unit
and type of sensor or signal.
2.5 Digital interface
A digital interface with TTL logic levels is available as standard for communication with external units.
A serial data port provides communication capability at a logic level of 0-5V (four wires: Tx, Rx, GND, Vcc).
A seven-pole cable, with mini DIN connector is supplied as a standard accessory, and a TTL to RS 232 adaptor is
available as an option.
2.6 Scale factor function
Easy menu-driven set-up to read or simulate electrical signal value in terms of engineering units. Four programmable
alphanumeric characters are available on the display to show the symbol of the parameter (i.e. mbar, %RH, %CO, etc.).
The display will indicate the scaled input/output value.
2.7 Square root function
Can be programmed during the set-up procedure (e.g. linear ranges only) to obtain direct readings of flow from a dP
transmitter signal. The display limits are 0 and +2500.
2.8 Average measurements
For the measurement of unstable input signals by a progressive averaging of a programmable number of conversions.
2.9 Simulation programs
Menu-driven set-up to generate: