Service manual

MD-MS701W/MS702
– 16 –
Ambient temperature Temperature correction
-5
o
C ~ +9
o
C 08h + 0.5
o
C
+6
o
C ~ +21
o
C 07h + 12.5
o
C
+17
o
C ~ +32
o
C 06h + 23.6
o
C
+29
o
C ~ +44
o
C 05h + 35.0
o
C
Center temperature
[3] Power IC VREF feed control output
• Test/R-ROM write power input
*Meaning of values
• Temperature reference = Value to be predicted to be measured by the microcomputer at reference temperature
(+23.6
o
C)
• Temperature correction = Value to convert to measurement value at reference temperature (+23.6¯C)
*Determining the temperature correction value
• Temperature detection characteristics formula
Ambient temperature (
o
C) = (-2.876 x TEMP input AD value) + 463
Hence, TEMP input AD value = (463 - Ambient temperature)/2.876
• The reference temperature (+23.6
o
C) is taken as a reference. (it is taken as '0'). Whenever the input AD value changes
by '1', temperature is determined.
For temperature correction, the input AD value is +/- inverted.
Ambient temperature
Temperature correction
+14
o
C ~ +16
o
C - 03h + 15.0
o
C
+17
o
C ~ +19
o
C - 02h + 17.8
o
C
+20
o
C ~ +22
o
C - 01h + 20.7
o
C
+23
o
C ~ +25
o
C ± 00h + 23.6
o
C
+26
o
C ~ +27
o
C + 01h + 26.5
o
C
+28
o
C ~ +30
o
C + 02h + 29.4
o
C
[2] Temperature measurement value correction table
Center temperature