Ashcroft ATE-100 Handheld LCD Digital Calibrator - Manual (Page 21)

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Revision 4.6 3/2004
Section 9.0 Tare Function
The HHC has the ability to tare (subtract an operator
selected value) from the displayed pressure or tempera-
ture measurement value of either one or two installed
Quick Select modules. This is most commonly required
in applications where a pressure pre-load, as in a weigh-
ing application, must be subtracted from the displayed
pressure measurement.
If the HHC is in use with two Quick Select modules,
independent tare values can be entered for each of the
pressure modules. If one of two installed Quick Select
modules has been deactivated, meaning the measured
values are not shown on the display, the calibrator will
request a tare value only for the active module. To input
a tare value for one or two Quick Select pressure mod-
ules follow the steps below:
Step 1 With the HHC on and displaying pressure mea-
surement data press the tare key.
TARE
The HHC will respond by displaying the following:
Left tare value
+xxxxxx
If a tare value was previously programmed the HHC will
display that value. If the previous tare value was zero the
HHC will display the last pressure measurement value
displayed prior to pressing the TARE key.
Step 2 Use the number keys to input a tare value other
than the default value or to change the existing tare
value. If no tare value is desired input zero (0).
Warning: Failure to enter the zero (0) will result in the
HHC automatically accepting the last displayed value as
the desired tare value.
Left tare value
+12345
Step 3 With the desired value displayed press the
enter key.
ENT
The HHC will respond by displaying the following:
Right tare value
+xxxxx
Step 4 Use the number keys to input a tare value other
than the default value or to change the existing tare
value. If no tare value is desired input zero (0).
Warning: Failure to enter the zero (0) will result in the
HHC automatically accepting the last displayed value as
the desired tare value.
Right tare value
+12345
Step 5 With the desired value displayed press the
enter key.
ENT
Note: The measurement data on the display will flash if
the HHC is operating in the tare mode.
After pressing the enter key the HHC will resume
normal pressure measurement activities. Tare values may
be reviewed at any time by pressing the TARE key. If the
HHC is being used with two Quick Select modules and
only one module has a nonzero tare value the display
will only flash on the side that corresponds to the Quick
Select module with the nonzero tare value.
Step 6 To exit the tare mode follow the procedures out-
lined in steps 1 through 5 and at the tare value prompt
enter zero (0). When the tare values for both modules
have been reset to zero tare mode operation will be dis-
continued and the display will stop flashing.
Section 10.0 Hold Function
The hold function provides the ability to freeze the dis-
played pressure, flow or electrical measurement values.
In addition, pressing the hold key will result in an H
appearing in the RS232 output data stream and will also
result in a flashing H appearing on the left side of the top
line of the instrument display.
The RS232 output will look as follows for a dual sensor
measurement:
Normal Operation
+1.2345 inH2O +1.2345 inH2O
Left Min: +0.00000 Max: +1.2345
Right Min: +0.0000 Max: +1.2345
With Hold Function Invoked
+1.2345 H inH2O +1.2345 inH2O
Left Min: +xxxxx.x Max: +xxxxx.x
Right Min: +xxxxx.x Max: +xxxxx.x
Section 10.1 Using the Hold Function
Step 1 To invoke the hold function press the hold key.
HOLD
The HHC will respond by freezing the displayed values
and adding a flashing “H” that will appear in the left
most position on the top line of the display.