FPG8601™/VLPC™ OPERATION AND MAINTENANCE MANUAL
© 2007 DH Instruments, a Fluke Company
Page 32
It might be necessary to use tubing in order to attach the DUT to the FPG. If needed,
KF16 bellows tubing is recommended. Tubing of comparable volume and flexibility can
be used.
Power on the DUT.
Most DUTs require a warm-up time before they can be calibrated accurately. Check the
DUT users manual for the proper warm-up time.
Using two tubes and a shut-off valve, connect the DUT’s test and reference ports
together.
For safety reason, shorting the test port to the reference port will ensure that the
differential pressure across the DUT will remain near zero in all conditions. When the test
begins, the DUT's test and reference ports should be isolated using the shut-off valve
between the two ports.
Open the shut-off valve between the high and low port of the DUT.
Turn on both vacuum pumps.
Switch the FPG to absolute mode (see Section 6.9.2.2).
4.11
CONNECTING THE DUT MANIFOLD
This section describes how to setup the optional DUT manifold. If properly setup, the manifold can be
used in gauge, absolute and absolute differential mode with up to 3 DUTs without having to
adjust plumbing. The manifold must be turned on in FPG Tools by using tools on the
[Config], [System
Setup], <Options>
tab (see Section 6.6.2.2).
The steps below describe what is required to setup the DUT manifold.
Set the manifold on the table so that the two pneumatic valves are closest the left side of the FPG
test ports.
Attach a KF16 15 in. bellows tube to the Test (hi) port on the FPG.
Attach a KF16 15 in. bellows tube to the Test (low) port on the FPG.
Attach the remaining ends of the bellows tubes to the DUT manifold’s hi and low ports.
The two bellows tubes should be parallel to each other.
Fasten the external valve driver cable to the connector labeled “external drivers” on the back of the FPG.
Attach the remaining end of the external valve driver cable to the associated connector on the DUT
manifold.
Attach shop air (regulated to 700 kPa (100 psi)) to the 1/8 in. NPTF fitting on the manifold.
DUTs should be connected to the manifold by adapting as necessary. When possible connect
differential and gauge DUTs to both the high and low ports of the manifold. This ensures that the
DUTs and the FPG are using the same reference pressure.
