44
TWITE INSTRUMENTS
THERMOSTAT MODEL TD-196 OPERATING MANUAL
CALIBRATION AND DEFAULT VALUES CONT.
C
ALIBRATE
V
ALUES
C
HECK
& A
LTER
(1) “SET” & “ENT” &
“
s
” KEYS CONT.
When the correct values have been entered
(make sure to keep a copy of the correct
values in case of memory loss)
press the
“SET”
key while the
"CAL"
switch is
depressed, the display will then show
"done"
, press the
"ENT"
key again to reset
the unit for normal operation.
IF ANY VALUES WERE CHANGED BY THE ABOVE OPERATION. THE UNIT
MAY GIVE AN ERROR MESSAGE OF "C-CA' TO INFORM OF AN ERROR IN
CALIBRATION VALUES. TO RECTIFY THIS IT WILL BE NECESSARY TO
ENTER THE CALIBRATION VALUES INTO OTHER SECTIONS OF RAM FOR
THE CHECK SUM AND CORRUPTION TESTING.
TO DO THIS, USE THE "CALIBRATION VALUES UPDATE" FOLLOWING.
C
ALIBRATION
V
ALUES
U
PDATE
(2) “SET” & “ENT” & “
t
”
KEYS.
If an error message appears
"C-CA"
it means that the calibration values have been
altered or are corrupt. To rectify this, first check that all calibration values are
checked by using the previous function "CALIBRATE VALUES CHECK & AL-
TER". After doing this, use this function to update all values for the check sum and
corruption testing in the unit. When this function is first entered the display will show
"CALS"
to indicate that the
"CAL"
switch must be pressed, press the
"CAL"
switch and then the display will show
"C U"
to indicate that the update has been
done, press the
"ENT"
key to reset the unit and resume normal operation.
T
EST
D
ISPLAYS
(3) “ENT” & “
s
” KEYS
All LED displays and Indicators will be lit. If some segments are not lit, those
segments will be faulty and service is required.
Press the
“ENT”
key for reset and normal operation.
M
EMORY
(RAM) T
EST
(4) “ENT” & “
t
” KEYS
If the memory test was successful the LED will display
"r O"
. If the RAM was
found to be faulty the display will display
"A EE"
, and if the CPU RAM was found
to be faulty
"C EE"
.
Press the
“ENT”
key for reset and normal operation.
