4. OPERATION
Page 61 © 2005 DH Instruments, Inc.
4.2 FREQUENTLY USED FUNCTIONS
Regular ADCS-601 operations relating to connecting and disconnecting devices under test and
setting pressures are performed from the ADCS Tools ADCS Run Screen (see Section 4.3.5).
How to perform common ADCS-601 functions is summarized in Sections
4.2.1 to 4.2.8).
4.2.1 CONNECTING A DEVICE UNDER TEST (DUT)
The ADCS-TEST(+) port should never be pneumatically accessed (make or break connection)
unless the ADCS is “vented” following the instructions below. Damage to the system and/or
the DUT may result from opening the TEST(+) port in other than “vented” condition.
The device or devices under test (DUT) are connected to the TEST port(s) at the front of the
ADCS-601 Reference Bench.
Absolute measurement mode devices are connected to the TEST(+) port only. For gauge or
“differential” mode devices the high side is connected to the TEST(+) and the low side is
connected to the TEST(-) port. The TEST(-) port is at atmospheric pressure when the
ADCS-601 is in gauge mode.
The TEST port connections are self sealing quick connectors (with no quick connector stem
installed, they are closed). To connect, use one of the quick connector stems supplied with
the ADCS-601 accessories. For proper ADCS-601 operation it is important that the system
connected to the TEST port(s) be leak free and the volume connected to the TEST (+) port
not exceed 1 liter (61 in.
3
). When operating ADCS-601 with nothing connected to the TEST
(+) port, the quick connector plug supplied should always be used to seal it. Though the
quick connectors are self sealing, they may leak.
To access the test port, it must be vented to atmosphere.
In gauge measurement mode: the TEST(-) port is always vented. To vent the TEST(+)
port, press the [VENT] button on the ADCS Run Screen Toolbar (see Section
4.3.5.3) and
wait for the vent process to complete (indicated <Pressure> is <0.000> and Ready). The
TEST(+) port can then be accessed safely without damage to the DUT or the system.
In absolute measurement mode: The
TEST(-) is not used and in an unknown state. To
vent the TEST(+) port, press the [VENT] button on the Run Screen Toolbar (see Section
4.3.5.3) and wait for the vent process to complete (indicated <Pressure> is < --- VENT--- >
and Ready). The TEST(+
) port can then be accessed safely.
4.2.2 CHANGING PRESSURE UNIT OF MEASURE
ADCS-601 supports a variety of pressure units of measure. To change the pressure unit for the
ADCS pressure, press the [Unit of Measure] button on the ADCS Run Screen Toolbar (see
Section
4.3.5.3) and select the desired unit. When the ADCS pressure unit of measure
is changed,
the unit of measure of the ADCS-601 components (RPM pressure monitor, PPC pressure
controllers) is also changed, if the unit selected is supported by the component. If the unit is not
supported by the component, the component does not make a unit of measure change.
A shortcut to changing pressure unit of measure is to click on the pressure value. If the
pressure unit shortcut is supported for that value, a pop menu gives the change unit option.
Note that the pressure unit of measure for the values of <ATM> (atmospheric pressure) and
<Reference Vacuum> are set separately from the rest of the ADCS pressure value units.
For information on the pressure conversion calculations used by ADCS-601, see Section 9.1.1.
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