Chapter 4 – Functions of the instrument
UM-18400E-U ATEQ F580 User manual Page 95/168
f) Calibration check by volume
A solenoid valve is used to create a pressure drop by increasing the volume at the end
of a test on a good part.
This auto-diagnostic check is done manually by the operator from the special cycles
menu, or automatically using programmable input 7 of the J3 connector programmed for
this function, or using a programmed function key on the optional RC5 keypad, if this is
installed. In these last two cases the first operation must be carried out manually in
order to set the volume parameter.
This cycle is only carried out if the test result is good and in this case you will see the
messages "Pass" and "end of cycle". If the test result is bad, you will see the
messages "Fail" and "end of cycle", and the auto-diagnostics cycle is not carried out. If
the test on the part is good and the auto-diagnostics check is bad, you will see
simultaneously the messages: "Pass", "alarm" and "end of cycle"
If the pressure drop is close to the diagnostic reject level set, this gives an auto-
diagnostics fault (value of auto-diagnostic reject plus or minus X %).
The auto-diagnostics check parameters include:
9 the last measurement value (not modifiable),
9 the value of the auto-diagnostics reject, (value of the expected pressure drop when
volume is increased),
9 the value of the tolerance as a percentage, higher or lower in relation to the
pressure drop.
9 the auto-diagnostics time must also be set so as to obtain repeat values. The
default setting for this time is zero and the parameter must be determined according
to the volumes used.
The auto-diagnostics time parameter must be set so as to obtain repeatable values.
) Select the option and enter settings if necessary.
g) ATR (Transient attenuation)
9 Problem:
This pressure drop during the test time is
due to a leak or a transient effect?
The test environment is not always ideal
to measure a pressure drop. Several
irregular variables (ex: temperature,
volume variations,...) can influence the
measurement. We call these transient
effects.
Fill Stab. Test Dump
Time
Pressure
Pressure
drop
To avoid any influence, a solution is to increase the stabilisation time to obtain the ideal
test time measurement conditions. However increasing the stabilisation time for each
test does not suit a normal production frequency.
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