Temperature Compensation with PICOSTRAIN in Practice

Six simple measurements are necessary to get the correction factors for the span compensation resistor and the offset correction.

The correction factors are calculated as

These values are to be written into registers TKOffs and TKGain of the PS021. By means of this simple method a scale can be built that fulfills the quality requirements of calibrated scales.

M1:

= M(T1,L0,TkG0)

Result with TKGain = 0 (TkG0) at lower temperature (T1) and no load (L0)

No Load

Low Temperature

M2:

= M(T1,L1,TkG0)

Result with TKGain = 0 (TkG0) at lower temperature (T1) and maximum load (L0)

Max. Load

M3:

= M(T1,L1,TkG1)

Result with TKGain = 1 (TkG1) at lower temperature (T1) and maximum load (L1)

M4:

= M(T2,L0,TkG0)

Result with TKGain = 0 (TkG0) at upper temperature (T2) and no load (L0)

No Load

High Temperature

M5:

= M(T2,L1,TkG0)

Result with TKGain = 0 (TkG0) at upper temperature (T2) and maximum load (L1)

Max. Load

M6:

= M(T2,L1,TkG1)

Result with TKGain = 1 (TkG1) at upper temperature (T2) and maximum load (L1)

>> Example

6 Measurements

(Click to enlarge)

Measurement points

Download Application Note AN015

as Acrobat PDF (108 KB, June 2006)

Download Calculator for TKGain and TKOffs

as Exell-Sheet

(23 KB, June 2006)