Vaisala PTB220 User Manual download pdf (Page 67)

CHAPTER 7__________________________________________________ADJUSTMENT AND CALIBRATION

VAISALA _________________________________________________________________________ 61

Offset and gain adjustment

LCI Entering linear corrections

LCI n <cr>

where:

n = number of the pressure transducer (1, 2 or 3)

The LCI command is used to enter new linear offset and offset/gain

corrections to the barometer. Note that the user must give the linear

corrections to each pressure transducer separately.

Entering new linear corrections is protected by switch. The switch

SW4 is normally in write DISABLE position (OFF) and the user must

change it to write ENABLE position (ON) to be able to enter new

linear corrections to the barometer.

The previous corrections must first be deactivated using the LC OFF

and/or MPC OFF commands. Pre-calibration of the barometer then

gives the required new corrections. The new linear corrections will

always cancel the previous corrections as well as the valid date of

calibration of the barometer (see CALD command). When the new

linear corrections have been entered, they must be activated with the

LC ON command. Use ESC to abort without executing the command.

In the following, an example of performing an offset adjustment for

pressure transducer P1 and an offset/gain adjustment for pressure

transducer P2 is given.

>lc off <cr>

Linear adj. : OFF

>lci 1 <cr>

P1 1. reading ? 1013.25 <cr>

correction ? -0.1 <cr>

P1 2. reading ? <cr>

>lci 2 <cr>

1. reading ? 800.00 <cr>

correction ? 0.05 <cr>

P2 2. reading ? 1000.00 <cr>

correction ? -0.02 <cr>

>lc on <cr>

Linear adj. : ON

Reading Correction Reading Correction

1013.250 -0.100 800.000 0.050

1013.250 -0.100 1000.000 -0.020

1 2 ... 62 63 64 65 66 67 68 69 70 71 72 ... 112 113

No comments

Vaisala PTB220 User Manual Page 67