Calibration VirTis Wizard 2.0
16 Revision 001, 03/09
© SP Industries, Inc. 2009
8. Set the thermocouple calibrator to the value near the unit’s specified low
temperature value (e.g., -60.0 °C for ES and XL models and -85.0 °C for the
EL model).
9. Adjust the Temperature Span until the Shelf Temperature matches the value
on the thermocouple calibrator. The Shelf Temperature reading should
stabilize at a value no higher than the thermocouple calibrator temperature
setting and no lower than -0.4 °C of that value (e.g., if the thermocouple
calibrator is set to -60.0 °C, the Shelf Temperature value should read between
-60.0 °C and -60.4 °C).
10. Repeat until both the high and low readings are within the stated accuracy
limits.
11. Press Synoptic to return to the Synoptic screen and verify temperature
values from -80 °C to 60 °C using the calibrator.
Note: Because of digital filtering, temperature values may take a few seconds to settle
to the correct value after changing from one to the next.
12. Remove the calibrator and reconnect the shelf probe.
Vacuum
For vacuum measurements, SP Industries recommends a high-quality calibrator such
as the Varian Vacuum Reference Gauge Tube.
For consistency, perform all vacuum calibrations in Torr. After calibration, you can
change the vacuum units, if desired.
1. Allow the system to equalize for at least ten minutes in a draft-free area.
2. Adjust the Vacuum Probe 1 potentiometer (located next to the probe tube
connector on the rear of the Wizard 2.0 controller) so that the rough vacuum
reads 760 Torr. Turning the potentiometer clockwise increases vacuum, while
turning the potentiometer counterclockwise decreases vacuum.
3. Turn the potentiometer an additional 1/8 turn. This will minimize drift effects
below 760 Torr at atmospheric pressure.
4. Replace the system vacuum tube with the vacuum reference gauge tube.
5. Press the Maintenance button.
6. Select the Service Routines menu.
7. Enter the security code (678) and press Enter.
8. Read the Vacuum 1 value. Adjust the Vacuum 1 Calibrate value up or down
until the vacuum reads 1 or 2 mTorr. Do not leave it at zero.
9. Press Enter.
10. Remove the vacuum reference gauge tube and replace the system vacuum
tube.
11. Allow the system time to warm up and recheck the rough vacuum reading of
760 Torr after a few minutes.
Note: If you need to change the rough vacuum, you must recalibrate the low vacuum
first.
12. Repeat steps 1 through 11 for Vacuum Probe 2, if present.
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