Ashcroft ATE-100 Handheld LCD Digital Calibrator - Manual (Page 66)

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Revision 4.6 3/2004
Calibration done
Save Cancel
Step 20 Using the left/right arrow keys select “Save” to
write the new data to the EEPROM calibration storage.
To discard the electrical readings select Cancel.
***WARnInG***
Selecting and entering the word “Save” will overwrite
the calibration data previously stored in EEPROM
memory. Previously stored calibration data will be per-
manently
destroyed.
Step 21 With the desired selection flashing (Save or
Cancel) press the enter key.
ENT
Step 22 If “cancel is selected the calibrator will exit
the calibration mode. If “save” is selected the calibrator
will prompt you to enter the date of the new calibration
as follows:
mmddyy
- - - - - -
Step 23 Using the number keys enter the current date
such as:
mmddyy
031196
For March (03), eleventh (11), 1996
Step 24 With the desired date entered and displayed,
press the enter key.
ENT
Step 25 Turn off the calibrator and install the desired
Quick Select module.
Step 26 Turn on the calibrator to resume general pres-
sure measurement activities.
Note: During electrical recertification any of the calibra-
tion ranges may be skipped by pressing the clear entry
(CE) key. When the clear entry key is pressed during the
electrical calibration process the calibrator will advance
to the next electrical input in the calibration sequence.
Section 27.5 Recertification of Quick Select
Pressure Modules
The calibrator is available in a selection of accuracies
from ±0.1% of span through ±0.025% of span, covering
ranges from 0.25 inches of water to 10,000 psi. Whereas,
the calibrator can be calibrated in the field, appropriate
pressure standards must be used to assure the accuracy
of the calibrator system is not degraded by the calibra-
tion process. As recommended by standards organiza-
tions such as A.S.M.E., n.I.S.T and various U.S. and
world government agencies calibration standards should
be at least 4 times more accurate than the device to be
calibrated.
Therefore, if you will be calibrating a ±0.1% of span
Quick Select pressure module, a standard of equiva-
lent range would have to have an accuracy of at least
±0.025% of span. If the standard to be used is of a
higher range than the Quick Select pressure module
to be calibrated, even greater accuracy is required. For
example, if a ±0.1% of span Quick Select pressure
module with a range of 50 psi is to be calibrated with a
100 psi standard, the calibrating standard should have a
minimum accuracy of ±0.0125% of span.
To recertify a Quick Select pressure module follow the
procedure outlined below.
Step 1 With the power to the calibrator off install the
Quick Select pressure module to be calibrated in the left
module bay (looking down on the unit with the keypad
up and the display at the top).
Step 2 Power up the calibrator system by pressing the
on/off key.
ON
OFF
Step 3 Set the left side of the display for the engineer-
ing units to be used for the calibration process. Informa-
tion on engineering unit selection is provided in Section
8, Engineering Unit Selection.
Step 4 With the calibrator on and displaying pressure
measurement data press the set up key.
SET
UP
Step 5 Using the arrow keys locate the text “Calib” in
the set up menu.
Calib RTmodule
Select the text “Calib”. When selected the text will flash
on the display.
Step 6 With the text “Calib” displayed and flashing
press the enter key.
ENT
Step 7 The calibrator will respond by displaying:
Access code ?
.000000