Ashcroft ATE-2 - Handheld Calibrator - Manual (Page 69)

67
0.025% - 0.07% standard accuracy
11 points (approximately 10% increment)
0.1% standard accuracy
6 points (approximately 20% increment
0.25% standard accuracy
5 points (approximately 25% increment)
When calibrating linearity, the HHC will automatically choose the
number and pressure value of data points based on the module’s
full scale pressure range and it’s base accuracy specification.
Pressure module recalibration is a firmware based, menu driven
procedure that provides prompts on the HHC display directing
the operator to apply precision pressure at zero, full scale and
several cardinal points, the quantity of which is determined by
the accuracy specification of the module. Module recalibration is
accessed via the menu system.
NOTE Following Pressure Module Calibration, damping is auto-
matically set to 16 (maximum.). To reduce the damping level to
1 (minimum), power cycle the HHC, or remove and reinstall the
pressure module.
REQUIRED EQUIPMENT
A Precision Pressure standard must be used to maintain the
stated accuracy of the pressure module. It is recommended to
have the pressure standard accuracy 4 times better, than the
accuracy of the calibrated module.
PRESSURE MODULE FIELD CALIBRATION PROCEDURE
1. Insert Pressure Module to be calibrated into the CH 1 Module
bay (left bay, when the HHC faces the operator with module
bays up).
2. Turn the base unit on by pressing the green “ON/OFF” button
on the keypad
3. Initiate the calibration process as follows:
a. Press MENU key
b. Press DOWN or UP ARROW key to highlight “Setup…”
c. Press ENTER
d. Press DOWN or UP ARROW key to highlight “Calibrate”
e. Press ENTER
Cal Password screen appears. Enter Calibration Password
f. Press left and RIGHT ARROWs to position cursor beneath
desired character
g. Press UP and DOWN ARROWs to increment numeric
characters
h. When the password is correct press ENTER
i. “Calibrate” screen appears
Note: If the incorrect password is entered, the HHC display
will show a message “Bad Cal PW”, and the user will be
asked to Retry or Abort.
j. Press DOWN or UP ARROW key to highlight “Pressure
Module…”
k. Press ENTER
l. “Pres Mod CH1 Cal” screen appears
SECTION 15 o. PRESSURE MODULE CALIBRATION
CONT.
Cal Password
00000
^
Enter to accept
Esc to cancel
Ꮨƽ