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Feature #1285

Updated by tin over 5 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|                   |        | 
 |11/19|                   |        | 
 |11/20|                   |        | 
 |11/21|                   |        | 
 |11/22|                   |        | 
 |11/23|                   |        | 
 |11/24|                   |        | 
 |11/25|                   |        | 
 |11/26|                   |        |

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