Publication 1794-6.5.12 - November 1997
Calibrating Your Module 6-7
If the BTR word reads 80FF (hex), repeat the BTW. Make sure that
sufficient time is allowed for the module to respond to your request.
5. Set the precision millivolt source to the value required for a gain of 2.
Repeat steps 3 and 4 for gain 2. Repeat for each gain setting.
6. When all offset calibrations are successful, proceed to the gain cali-
bration.
Gain Calibration
After completing the offset calibration, proceed with the gain calibration.
1. Connect a precision millivolt source across each input channel. Set
the source to 320.00mV for a gain of 1. Connect all (L) signal
terminals together and attach to the positive lead from the precision
voltage source. Connect all (–) signal terminals together and attach to
the negative lead.
2. Apply power to the module for 20 minutes before calibrating.
3. After the connections stabilize, send a block transfer write with the
corresponding EDT command for your input to the module.
4. Monitor the block transfer read word 10 bits 00-15 for an echo of the
EDT command.
If the BTR word reads 80FF (hex), repeat the BTW. Make sure that
sufficient time is allowed for the module to respond to your request.
5. Set the precision millivolt source to the value required for a gain of 2.
Repeat steps 3 and 4 for gain 2. Repeat for each gain setting.
6. When all gain calibrations are successful, proceed to “current source
calibration.”
Gain Selected Input (mV)
EDT Command
Hex Decimal
1 320.00±0.160mV 2420 9248
2 320.00±0.160mV 2421 9249
4 110±0.055mV 2422 9250
8 70.00±0.035mV 2423 9251
16 29.00±0.015mV 2424 9252
32 19.00±0.010mV 2425 9253
64 4.000±0.002mV 2426 9254
128 2.000±0.001mV 2427 9255
To Next Page
Loading...
