DH Instruments ADCS-601-AF, Руководство по эксплуатации и обслуживанию

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4. OPERATION
Page 61 © 2005 - 2007 DH Instruments, a Fluke Company
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-AF 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-AF 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-AF accessories. For proper ADCS-601-AF 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-AF 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-AF 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-AF 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-AF, see
Section 9.1.1.