g) Rotate knob to display a DAC value of
200
. Adjust potentiometer VR1 on power
supply board to the point where the heater
neon just stops flashing and stays on
continuously. (On some early models the
power supply boards do not have a
potentiometer if this is the case go straight to
(h).
h) Rotate knob to set DAC to a value where
the heater neon just stops flashing and
remains off for at least 10 secs.
i) Rotate the knob to set the DAC value to 10
less than the value in (h) e.g. If value found
in (h) is
52
set DAC value to
42
. Press
'S'
to
enter value.
j) Press
'F'
twice to return to main screen.
7.4 Heater
Control
a) Press button
'S'
the display should now
flash
b) Rotate the setting knob to give a SET
TEMPERATURE at least 5°C above ambient
or initial indicated bath temperature (but not
higher than 40°C).
c) Allow bath to stabilise for at least 5
minutes at the SET TEMPERATURE
d) BATH SET TEMP and BATH TEMP must
be identical viewed over a period of at least
10 seconds on the LED
7.5 Calibration
a) Place the unit in a tank of water who's
temperature is below 20°C. Set the SET
TEMPERATURE to a temperature which is
above the water temperature but not greater
than 20°C, allow the unit to stabilise for
at
least 5 minutes.
b) Press
'F'
and
'S'
simultaneously for 5
seconds. The display should show
LCAL
. (It
may take several attempts to achieve this).
c) Press
'S'
d) Turn knob so that the average
temperature of the display over a period of
15secs, equals the temperature on the
external thermometer.
e) Press
'S
' to accept
f) Press
'F'
g) Set temperature to 70°C
h) Allow the water temperature to reach
70
and stabilise for at least 5 minutes.
i) Press
'F'
and
'S'
simultaneously for 5
seconds. Display will read
LCAL
. (It may
take several attempts to achieve this).
j) Turn the knob to select on the LED display
hCAL
then
k) Turn the knob so that the average
temperature of the display over a period of
15secs, equals the temperature on the
external thermometer.
l) Press
'S'
to accept.
7.6
Store Calibration Figures
a) Press 'F' and 'S' simultaneously for 5
seconds. The display will show
L
CAL
. It may
take several attempts to achieve this
b) Rotate the knob through
hCAL
,
rst
to
FCAL
.
c) Press
'S'
, LED shows
0
.
d) Rotate knob to display password of
1763
on green LED.
e) Press
'S'
to return to main screen and
store the calibration figures.
7.7 Accuracy Check
a) Having completed 7.5 and 7.6 allow a
further 5 minutes to elapse, check that the
difference between the units indicated
temperature and the external thermometer is
not more than 0.1 C
Press
'S'
GD100/GD120
Part No. 17592/Issue 1
July 2002
Page 15
Содержание OPTIMA RANGE GD100
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