Preamble
UM-18400E-U ATEQ F580 User manual Page 8/168
4. THE THREE TYPES OF TEST
4.1. TEST WITH REFERENCE
TEST PART
SENSOR
REFERENCE PART
Measurement of a pressure variation
between a test part and a reference part.
The ideal measurement conditions are:
identical reference part and identical
ATEQ connections to both parts (identical
lengths, diameters, and natures of the
pipes). The measurement taken with a
reference part will shorten the time taken
for the pressure equalisation occur. It is
valid for parts which cannot be deformed
and which mimic thermal and mechanical
effects.
4.2. TEST WITHOUT REFERENCE
TEST PART
SENSOR
PLUG
Measurement of a variation in pressure
between a test part and a plug on the
reference side. A test without reference is
not recommended, except if parts with
very small volumes are being tested. It is
preferable to always have a certain
volume on the reference side.
4.3. TEST WITH CENTRAL NAUGHT
TEST PART
SENSOR
TEST PART
It is possible to test two parts at the same
time. One part is connected to the test
side and the other to the reference side.
The differential sensor measures the drop
in pressure of one part in respect of the
other. This method may be used when
the number of bad parts is very low
(generally inferior to 1%). The probability
of having two bad parts at the same time
is very low. This method is also used for
distortable parts and parts with a constant
temperature which is different to the
ambient temperature. The central naught
test offers a considerable time advantage
(two parts tested simultaneously).
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