Ashcroft ATE-100 Handheld LCD Digital Calibrator - Manual (Page 31)

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Revision 4.6 3/2004
measurement (velocity or volume) mode of operation.
Refer to Section 14.2 for information on setting up the
HHC for velocity measurement or Section 14.4 for infor-
mation on setting up the HHC for volume measurement.
Step 2 Select the desired engineering units as outlined
in Sections 14.3 for flow velocity and 14.5 for flow
volume.
Step 3 Press the port select key.
PORT
SEL
The HHC will respond by changing the right side of the
display from pressure/flow measurement to the display
of an mA measurement. The display will continue to
display the output from the left Quick Select module in
terms of flow.
To read the output of the right Quick Select module in
terms of flow and the electrical measurement output
from the device under test press the Port Select key a
second time.
Step 4 With the flow and electrical measurements
appearing in the desired locations on the display the cur-
rent measurement can be changed to a voltage measure-
ment by pressing the mA/V key.
mA V
Pressing the mA/V key once will change the display to
“------“.
Pressing the mA/V key a second time will change the
display to “volts”.
Step 5 Connect the Quick Select pressure module to be
used to the pressure source to be measured.
Step 6 Connect the output of the device to the minia-
ture banana jacks on the keypad of the HHC as follows:
For current output devices: use the mA and com jacks.
For voltage output devices: use the V and com jacks.
Percent mode operation is also available for flow test and
calibration of measurement instruments. Refer to Section
13.0 for percent function set up and use information.
Section 15.0 Leak Detection Function
The HHC provides the ability to detect and quantify
leaks in terms of pressure decay over time (psi change
per unit of time) or in terms of leak rate (cc/sec).
In the pressure decay over time mode the HHC will
monitor the desired pressure vessel for the programmed
time interval and, at the end of the monitoring time
period, display the measured change in pressure. In the
leak rate mode the HHC will monitor the pressure vessel
over the programmed time interval and display the leak
rate in terms of cc/seconds.
Use of the leak detection function requires the setup
of the leak test parameters. The following procedures
should be followed to set up and perform a leak test
using the HHC.
Section 15.1 Leak Rate Function Setup
Step 1 With the HHC on and displaying pressure press
the set up key.
SET
UP
Step 2 Using the arrow keys, locate and select the
words “LeakRate” in the set up menu. When selected the
words “LeakRate” will flash.
EvntTimr Dampen
LeakRate Status
Step 3 With the words LeakRate flashing press the
enter key.
ENT
The HHC will respond by displaying:
Leak Mode
Rate Decay
Step 4 Using the left/right arrow select the word Rate.
Leak Mode
Rate Decay
Step 5 With the word Rate flashing press the enter key.
ENT
The HHC will respond by displaying:
Vessel Volume
cu.in. .000000
Step 6 Using the number keys enter the volume of the
vessel to be tested in cubic inches.
Vessel Volume
cu.in. 12324
Step 7 With the HHC displaying the required vessel
volume press the enter key.
ENT
Step 8 The HHC will respond by displaying:
Time to Monitor
sec. xxxxx