Digital AVC Instruction Manual
EAR99 Technology Subject to Restrictions Contained on the Cover Page
Page 14 of 17
Calibration
The HPM 4/5/6 is calibrated for all three tube types (DV-4, DV-5, and DV-6) at the factory. This ensures valid
readings will be displayed for each tube type when delivered. The user may re-calibrate the HPM 4/5/6 if
desired using either a reference tube or a vacuum gauge tube at a known vacuum using the instructions below.
3.5.1.
Preparation
•
Ensure the HPM 4/5/6 is turned off.
•
Plug in a DV-4, DV-5 or DV-6 Reference tube or plug into a tube at a known vacuum within the valid
range of the tube (see 1.2 for tube ranges).
3.5.2.
Enter Calibration Mode
•
Push and hold “TUBE SELECT” and “UNITS SELECT” simultaneously.
•
While holding these buttons, press and hold the “Power”
button.
•
When the LCD displays “CALIBRATION MODE”, release all three buttons.
•
The LCD will display “CAL MODE” at the top and will flash “Select Tube Type” while
flashing the tube
type in the upper right-hand corner.
3.5.3.
Select Tube Type and Units
•
Press “TUBE SELECT” or “UNITS SELECT” until the correct gauge tube is displayed.
•
Press “POWER” to accept the tube type selection.
•
The LCD will flash “Select Units” while flashing the Pressure Units in the lower right
-hand corner
•
Press “TUBE SELECT” or “UNITS SELECT” un
til the desired pressure units are displayed.
•
Press “POWER” to accept the
unit selection.
•
The LCD will now display the current pressure in the selected units.
3.5.4.
Adjustment
•
The user may now adjust the displayed pressure value by pressing “TUBE SELECT” (Up) to
increase or
“UNITS SELECT” (Down) to decrease.
•
Use the buttons to match the displayed pressure to the known vacuum level.
•
While adjusting, a message may be displayed informing the user that they must wait before further
adjustment is allowed.
•
Allow time for the reading to settle (DV-5 tubes take about 3 minutes).
•
When the desired pressure value has been reached, press the “POWER” button to set this selection
and exit calibration mode.
NOTE:
The table in 1.3.2 specifies which Teledyne Hastings reference tube to be used in calibration.