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OMEGA Model CYD201/CYD208 User’s Manual
3-4 Operation
SoftCal™ calibrations are made at three temperature points: liquid helium
(4.2 K), liquid nitrogen (about 77 K), and 305 K. Below is the accuracy* of
the CY-7-SD-13 sensor:
+0.5 K 2 K to <30 K +
0.25 K 345 K to <375 K
+0.25 K 30 K to <60 K +1.0 K 375 K to 475 K
+0.15 K 60 K to <345 K
* These values generally apply to all silicon diode sensors. Only two-point
SoftCal™ calibrations appropriate for CY-7 series Band 11, 11A sensors.
This section covers the SoftCal™ Calibration Procedure (Paragraph 3.6.1),
Verifying SoftCal™ Operation (Paragraph 3.6.2), and Erasing SoftCal™
Compensations (Paragraph 3.6.3).
3.6.1 SoftCal™ Calibration Procedure
1. Turn on thermometer 30 minutes prior to operation.
2. Place the SET switch in position 1.
3. Hold
UNITS
until 0 kelvin (or equivalent in °C or °F) displays. The key
acts as a toggle. If the display rises, release and press again.
4. Press
CAL ENABLE
on rear panel with a pen tip. The display reads
"-SOF-" to indicate the unit is ready to erase the current SoftCal™
calibration. Within 2 seconds press
UNITS
again. The temperature
display changes from "-SOF-" to the current SoftCal™ setting.
5. Hold
UNITS
until the sensor temperature displays. For example, if
setting SoftCal™ for liquid helium, the display reads 4.2 K. If setting for
ice point, the display reads 0 °C.
6. Verify sensor stabilization at calibration temperature.
7. Press
CAL ENABLE
again. "-SOF-" again displays to indicate the unit is
ready to accept the calibration point. Within 2 seconds, press
UNITS
to
enter a new calibration point. (If
UNITS
is not pressed within 2 seconds,
the display returns to the alarm temperature). After 15 seconds, the
alarm setpoint temperature displays.
8. To enter more than one point, go back to step 5.
NOTE:
One point may
be entered between 1.4 K to 9.9 K. No point may be entered between
10 K and 40 K. Two points may be entered above 40 K.
9. Return the SET switch to position 0.