Digi-Star Analog Output EZIII - Manual (Page 8)

Analog Output
8
Specifications
Operating Temp. Range: -30 to +40 degree C
Output Signal:
0-20mA (Default)
4-20mA (optional) or 0 to 5V (optional)
0-20mA or 4-20mA Output Load Resistance: < 350 ohm
Resolution: 16 bits, 1LSB = 0.0015% of full scale range where 1 LSB
=244 nA or 7.5 mV
Nonlinearity: < +/- 0.012%
Gain plus Offset Error: +/- 0.15% max.
Temperature Drift: 50 ppm/degree C, 0.35% max.
Update rate: 10 times per second
Calibration
Calibration is an iterative process alternating between the “MIN” and
“MAX”
because offset adjustments affect the gain and gain
adjustments affect the offset.
Enter the Analog Output Test mode.
Select the “MIN” mode and adjust the Offset potentiometer (R1) on
the Analog Output PCB assembly to get 0.0000 mA(0.0000V).
Select the “MAX” mode and adjust the Gain potentiometer (R3) to get
20.000mA(5.0000V).
Repeat steps 1 and 2 until adjustments are not needed.