Advanced Instruments 3900, Service Manual

Page: 137 / 184

For 4C3 Cryoscopes & 3900 Osmometers:
1. Reconnect the fan and reinstall the
instrument back cover.
2. Reconnect the power cord and turn the
instrument on.
3. Make sure the Supervisor/Operator
keyswitch is in the Supervisor position
while using the
TEST
and
CALIB
menus
(see User Guide, Chaper 2).
4. When “
Cryoscope
(or
Osmometer
)
Ready
” is displayed, press the
TEST
soft
key. The display will change to “
Select
Test Item
” .
5. At
“
Select Test Item
”
, repeatedly press
the
>
soft key until the display reads
“
Probe Bin Test
”
.
6. At “
Probe Bin Test
” , press
START
. The
display will change to “
[Start] Ready?
” .
7. At
“
[Start] Ready?
”
, pipet or measure a
sample of probe bin-setting fluid into a
clean sample tube, place the tube in the
first position in a cassette.
8. Place the cassette in the left (input) deck
and press the
START
soft key. The
instrument will run a special freezing-
point test to determine the sample probe
resistance and bin number.
9. Record the sample probe resistance and
bin number in the Service Log at the end
of the user’s guide; then press the
STOP
soft key. The display will change to
“ Probe Bin Test ” .
10. Press SETUP to enter the SETUP menu,
then repeatedly press the
>
soft key until
the display reads
“
Set Sample Bin #
”
.
11. At “
Set Sample Bin #
” , press the
START soft key. The display will report
the current sample bin number setting.
12. If the current sample bin number setting
is not the same as that just determined,
enter the correct bin number by means of
the numeric keypad; then press the
ENTER
soft key. The display will change
to
“
Set Sample Bin #
”
; then press the
STOP soft key to return to
“
Cryoscope
(or
Osmometer
)
Ready
” . If the current
sample probe bin setting is the same as
that just determined, simply press the
STOP
soft key twice to return to
“
Cryoscope (or Osmometer ) Ready
”
.
Press the CALIB soft key and calibrate
the instrument as recommended in the
User Guide, Chaper 4.
NOTE:
Recalibration using the
CALIB
procedure is required when the
sample probe is replaced; trying
to use the automatic calibration
cassette when replacing the sample
probe may cause a
“
Calibrator
Out of Range
” error message.
4CP700 Rev5
(4C35/3905 Service Manual)
Page 5 of 5