ATEQ D520 - Page 68

Chapter 4 – Functions of the instrument
UM-22100H-U User manual ATEQ D520 Page 58/122
2.1.3. 8) Pressure correction
The "pressure correction" function allows the conversion of the results by the instrument
to a defined pressure instruction.
When the function is activated, the instrument recalculates the flow results depending
on the instruction pressure. The measurement results will therefore no take into account
pressure variations.
) Select the option and adjust settings if necessary.
2.1.3. 9) Pressure reset
The reset cycle in an ATEQ D520 instrument is carried out for each test cycle. This
function allows the positioning of the auto zero (reset) in the test cycle. The positioning
can be done BEFORE (just after the cycle start order and before the test cycle and
before the test cycle), AFTER (just after the test time) or WITHOUT (no pressure auto
zero).
) Select the option and adjust settings if necessary.
2.1.3. 10) Offset
This function allows the subtraction of the value set in the parameters from the value
actually measured by the instrument. Example: if the measurement of the flow is of 14
litres a minute and the value of the offset set is of 5, then the instrument will display a
flow value of 9 litres per minute (9 = 14 – 5).
) Select the option and adjust settings if necessary.
2.1.3. 11) ATR (Transient attenuation)
An ATR cycle enables time to be gained over a traditional cycle by enabling the
stabilization time to be reduced and absorbing the transient pressure. The transient
pressure is an unexpected drop in pressure caused by a stabilization time which is too
short. The ATR may require a “learning cycle” to enable the transient pressure to be
measured.
a) ATR1
The value of the transient is unknown. A special learning cycle must be carried out.
Associated parameters to be set: Initial (Initial value of the transient), Transit (actual and
non modifiable value of the transient), Tolerance (Drift tolerance on acquisition of the
transient, % of the reject level).
) Select the option and adjust settings if necessary.