M871 Digital indicator
Digital indicator type M871 has been specifically designed to operate in connection to load cells or other strain-gauges transducers.
The instrument is compact, rugged, reliable, with a very good noise immunity, manufactured with first-class components and carefully assembled and tested.
The analog-to-digital conversion of the input signal is effected by a sigma-delta A/D
converter, with a 16-bit internal resolution; the instrument is a ratio meter, using the
transducer supply voltage as reference voltage, so compensating any error due to voltage drops along the connecting cable.
The digital functions of the instrument are carried out by a CHMOS single-chip microprocessor; several options are available (see relevant list).
Instrument setup and calibration, commands and parameter settings are carried out through the front waterproof polycarbonate keyboard, with 16 numeric and function keys.
The built-in stabilized and short-circuit protected power supply unit, 5 V DC 60 mA max, is suitable to energize up to four strain-gauges bridges, 350 W, parallel connected.
Display: 5 digits, LED 7 segments, 14 mms high, red (adjustable brightness)
Range: internal 16 bit, engineering unit to be stated; resolution 1,2,5,10; programmable decimal point
Polarity: lighting the (-) sign for negative value
Zero and calibration: through keyboard
Accuracy: ± (0.01% of reading + 1 unit of LSD)
Sensitivity: 1 µV/LSD
Reading rate: up to 100 readings/second
Input impedance: greater than 100 Mohms
Common mode rejection: 100 db
Room temperature: operating 0 ÷ 55 °C; storage -10 ÷ 70 °C
Relative humidity: max. 80%
Temperature coefficient: 4 ppm/°C on zero; 4 ppm/°C on span
Line voltage: 115 or 230 V ± 10% - 50/60 cycle, or 12 or 24 V DC consumption: 5 VA max
Case: panel mounting, aluminium, complete with brackets, overall dimensions 96x96x180 mms
Connections: binding post connectors on rear side
-TA Zeroing, through keyboard, of net weight, with selection of indication of gross or net weight
-TA/D Zeroing of net weight as above, but with remote command (external free contact)
-S1-S2 One-two alarms for minimum or maximum load (programmable action), with settable alarm value and time delay; each alarm is provided with an SPST relay, 2 A capacity @ 110/220 V AC
-RS232 RS232C serial output, without control signals, programmable parameters
-RS485 RS485 serial output, programmable parameters
-PK Peak capture, selectable through keyboard: the instrument is di splaying and memorizing the maximum measured value
-DUM Dual range, or dual measuring unit (Kg – N or bar - Kg/cm², etc.) selectable through keyboard
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