Users’ Manual
EDI-53 Series Digital Indicator
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SPECIFICATIONS
EDI-53P
Input : Potentiometric displacement transducers with 0…2V DC output.
Excitation voltage output: 5 V DC
EDI-53L
Input : Resistance strain gauge bridge load cell with 0…3 mV/V output.
Excitation voltage output: 5 V DC nominal.
Recommended minimum L/C input resistance : 350 ohms (i.e. excitation current = 14 mA)
Absolute Minimum L/C input resistance : 90 ohms (i.e. maximum excitation current = 55 mA ).
Preamplifier gain : 100
NOTE: As the EDI-53 uses a four wire resistance bridge measurement system, signal lead resistance will
introduce an error proportional to the ratio of signal lead resistance to the load cell input resistance. E.g.
for a 350 ohms load resistance, 3.5 ohms lead resistance will introduce an additional full scale error of
0.1% [ = (3.5 / 350) x 100 ].
EDI-53I
Input : 4-20 mA DC current input.
Input resistance : 50 ohms
GENERAL
(The following specifications are common for all versions)
Display
LCD dot matrix alphanumeric display.
16 characters x 1 line.
Red led provided for battery low indication.
Keyboard
16 key environmentally sealed membrane keypad. Keys are multiple function. Primary key function and
numerical values are marked on keys.
Analogue to Digital Converter
Measurement resolution: +/- 20,000 counts resolution for 2V input.
Display resolution : Recommended maximum 2000 counts for 2V at ADC input.
ADC accuracy : +/- 0.1% FS for 2 V DC input.
Engineering Units Display
The indicator accepts linearization coefficients for linear scaling like Y = BX + C, or second order
polynomial calculation like Y = AX
2
+ BX + C, where X is measured value and Y is converted value in
engineering units. Indicator can store calibration coefficients A, B and C for up to 500 transducers.
CPU
Atmel AT89C51RC, 8-bit microcontroller.
