Fluke Calibration RPM4, Operation And Maintenance Manual

Page: 20 / 150

RPM4™ OPERATION AND MAINTENANCE MANUAL
Page 10
2.3.4 REMOTE [ENT] CONNECTION (FOOTSWITCH OR OTHER
SWITCH)
Connect the optional remote ENTER footswitch, if available or a user supplied switch fitted to
the optional cable (see Section 7.1). Connect the cable to the RPM4 rear panel connection
labeled
REMOTE ENTER . Activating the switch is equivalent to pressing the [ENT] key on
the front panel (see Section 3.1.3).
2.3.5 CONNECTING TO MEASURE PRESSURE (TEST(+) AND
TEST(-) PORTS)
Using a pressure connecting hose or tube of appropriate pressure rating, connect the device
or system to be tested to the RPM4
TEST(+) port.
The RPM4 TEST(+) connection is 1/8 in. NPT female (Q-RPTs of A70M or lower) or DH500 F
(Q-RPTs higher than A70M).
DH500 is a gland and collar type fittings for 6.35 mm (1/4 in.) coned and left hand
threaded tubes. DH500 is equivalent to AE F250C, HIP HF4, etc.
The TEST(+) and TEST(-) ports on Q-RPT modules of A70M and lower are threaded into
the aluminum Q-RPT manifold. Take care in making and breaking fittings not to cross
thread or otherwise damage the threads. It is recommended that an adaptor be
installed in the in Q-RPT manifold and make break operations be made on the adaptor
rather than the manifold.
SDS Self Defense System: Q-RPT modules designated A7M or lower include the SDS Self
Defense System. SDS, operated properly, allows a the Q-RPT TEST(+) port to be left
connected to a pressure up to 10 MPa (1 500 psi) without damage to the Q-RPT.
Do NOT attempt to use SDS in this manner without first becoming thoroughly familiar
with its operation and limitations (see Sections 3.2.7, 3.3.8, 3.5.4).
Q-RPT MODULE TEST(+) AND TEST(-) PORTS
Q-RPT modules of A70M and lower have both TEST(+) and TEST(-) ports. Q-RPT modules
greater than A70M have a TEST(+) port only. See Section 5.6, Figure 8 for RPM4 Q-RPT
module TEST port configurations.
The TEST(+) port is connected to Axxx (absolute) Q-RPTs’ sole measurement port and to the
high side of Gxxx or BGxxx (gauge or bi-directional gauge) Q-RPTs.
The TEST(-) port of Axxx and BGxxx Q-RPTs is connected to RPM4’s internal barometer.
The TEST(-) is connected to the low side of Gxxx (gauge) or Gxxx (bi-directional gauge)
Q-RPTs.
•
When operating in absolute mode: The TEST(-) port, if present, is left open to
atmosphere.
•
When operating in gauge or negative gauge mode with a range greater than 50 kPa
(7.5 psi):
The TEST(-) port, if present, is normally left open to atmosphere. A possible
exception is when the device or system under test is in an ambient pressure that may differ
significantly from the ambient pressure around the RPM4. For example, if the RPM4 is
measuring the pressure applied to DUTs in an environmental chamber, the pressure in the
environmental chamber may be different from ambient pressure around the RPM4. In this