Feature #1285
Updated by tin over 6 years ago
**Computation of the drift rate of calibration constant 72 (will take 1 week to complete): C = [(A – B) * 1000000] / [A * D] ppm per day A = the value of the calibration constant 72 (following an ACAL on day 1 of the test) B = the value of calibration constant 72 (following an ACAL on the last day of the test) C = the drift rate of calibration constant 72 in ppm per day D = the number of test days where the instrument was powered on during the test interval (See Note # 1) If the absolute value of C is > 0.43 ppm per day, then the A3 assembly in your instrument needs to be replaced. *Complete an ACAL just prior to obtaining the present value of Calibration Constant 72* |Date |CAL 72 after ACAL|ppm Deviation|TEMP?| |11/16| 981.648769E-3 |Initial| +41.3°C | |11/16 +3h| 981.652110E-3 |+0.334| +35.5°C | |11/17|981.652541E-3 |+0.043|+37.0°C | |11/17 7PM|981.665868E-3 |+1.333|+40.1°C | |11/18| | | |Date |CAL 72 after ACAL|ppm Deviation|TEMP?| Deviation from day 0, ppm | |1/18|997.711415e-03 |11/19| | 0 | 32.5 |11/20| | 0 | |1/19|997.711486E-03 |11/21| | +0.0712 | 31.9 | +0.0712 | |1/20|997.711441E-03 |11/22| | -0.0451 | 33.8 | +0.0261 | |1/21|997.711391E-03 | -0.0501 | 31.5 | -0.0241 | |1/24|997.711709E-03 |11/23| | +0.3187 | 30.6 | +0.2947 | |1/25|997.711798E-03 |11/24| | +0.0892 | 31.9 | +0.3839 | |1/26|997.712097E-03 |11/25| | +0.2997 | 29.9 | +0.6836 | |1/28|997.711577E-03 |11/26| | -0.5212 | 32.3 | +0.1624 | h2. Drift rate : *-0.01623 ppm/day*