Time Electronics 1090 Portable Process Calibrator - Manual (Page 19)

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1090 Technical Manual P a g e | 19
If the PRT/Current board is fitted and requires calibration, this must be done after the
voltage steps 1-6 above have been performed P50 calibrates the current measure
mode, and P51 current source mode. These should be adjusted at full-scale (30mA
measure, 80mA source).
If the PRT/Current board is recalibrated, you must repeat step 8 above afterwards
(use CLEAR to skip past the other steps).
Notes on the PRT/Current option board.
The PRT/Current board has calibration adjustments on-board for current source and
measure and can be supplied ready-calibrated for retrofitting in the field.
When a 1090 unit is initially factory calibrated, it is necessary to fit a calibrated
PRT/Current option board so that step 8 can be completed
(this calibrates for the initial accuracy of the on-board voltage reference).