DigiVac Bullseye Piezo Podręcznik użytkownika - Strona 13

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Vacuum Calibration

The calibration screen contains the numbers necessary to calibrate the gauge to a known good

standard. The "Vacuum" number on in the top right corner is millitorr x 10. For example, in the above

picture 1.3 Torr is displayed. The next number is counts, which is an internal number that literally

represents what is coming into the microcontroller's A2D converter and is a useful diagnostic. The

numbers on the bottom are:

• 760T – the Atmospheric pressure calibration number

• 3T – the vacuum or low-pressure calibration number

These numbers on the bottom represent the digital calibration points to be adjusted in order to

achieve optimal calibration. There are 2 ways to calibrate: Manually and Automatically. Press the

circular arrow Select button

when highlighted.

Automatic Calibration Procedure:

1. Press select until you get to calibration mode

2. Press select until you get to automatic

3. Set the manifold to 5.0 Torr

4. Press up and down simultaneously

5. Set the manifold 760.0 Torr

6. Press the up and down arrows simultaneously

7. Press up and down again simultaneously to store (This is the step where the calibration

numbers get stored)

At pressures above 775 Torr, the unit may display the text "Overrange"; this is typical as this is the

sensor's highest rated pressure range. For optimal accuracy, readings above 775 Torr, if displayed at

all, should not be used for precision readings.

to cycle through the calibration presets. Each function will capitalize

1 0 2 0 C a m p u s D r i v e W e s t , M o r g a n v i l l e , N J 0 7 7 5 1

s a l e s @ d i g i v a c . c o m w w w . d i g i v a c . c o m

7 3 2 - 7 6 5 - 0 9 0 0