Ashcroft ATE-100 Handheld LCD Digital Calibrator - Manual (Page 69)

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Revision 4.6 3/2004
Step 31 With the applied pressure displayed press the
enter key.
ENT
The calibrator will respond by displaying:
+xxxxx working
After 3-5 seconds the calibrator will request the next
calibration point by displaying.
Apply and enter
value 2.00000
Step 32 Apply the pressure required for the next cali-
bration point and enter the applied pressure value with
the number keys. For the second point a pressure of
20.003 has been applied.
Apply and enter
value 20.003
Step 33 With the required pressure level applied and
shown on the display press the enter key.
ENT
Step 34 Repeat steps 23-26 as many times as required
to produce the desired number of linearization points.
Points must be in sequence (low to high).
A maximum of 18 linearization points plus the zero and
span points may be programmed for Quick Select pres-
sure modules. Factory calibration consists of a 10 point
linearization combined with a 10 point upscale and 10
point down scale linearization and hysteresis check.
Important Note: The number of calibration points
needed to assure adequate correction for non-linearity is
as follows:
Sensor Accuracy number of Points
0.025% & 0.05% 20
including temperature (5% increments)
0.025-0.07% 11
(10% increments and zero)
0.1% 6
(20% increments and zero)
0.25% 5
(25% increments and zero)
Step 35 When the final linearization point to be per-
formed has been completed press the clear entry key.
CE
The calibrator will respond by displaying:
Calibration done
Save Cancel
Step 36 To save the new linearization data to memory,
thereby overwriting the previously stored values in the
EEPROM, select “Save” and press enter. To discard the
newly generated calibration information select “Cancel”
and press enter.
Step 37 If “cancel” is selected the calibrator will exit
the calibration mode. If the enter key is pressed with the
word “save” flashing the calibrator will prompt entry of
the date of the new calibration as follows:
mmddyy
- - - - - -
Step 38 Using the number keys enter the current date
such as:
mmddyy
031196
For March (03), eleventh (11), 1996
Step 39 With the desired date entered and displayed,
press the enter key.
ENT
Step 40 Turn off the calibrator and install the desired
Quick Select module.
Step 41 Turn on the calibrator to resume general pres-
sure measurement activities.