9 CALIBRATION (CAL) MODE
57
4) CAL then
vE
will appear on the leak rate indicator, and the calculated equivalent internal volume will be
displayed on the leak limit indicator in unit of L. The displayed value will blink.
5) Pressing the ENTER key clears the display of the equivalent internal volume and displays the
volumetric leak rate on the LO limit indicator. This value represents leak rate Q, in unit mL/min, under
the atmospheric pressure corresponding to the volume change to be given (
∆
V). Calculate the value
of Q using the equation above and enter the Leak rate with the
▲
UP and DOWN
▼
keys. Pressing
the SHIFT key moves the current setting digit to left.
6) Press the ENTER key to complete entry.
Press the RIGHT
►
key for 1 second or longer to view the drift value on the leak rate indicator for
verification.
7) Press the START key to run a leak test.
8) When the leak test enters the DET stag, immediately turn the dial of the Leak Calibrator to generate
volume change. The differential pressure caused by the volume change is compensated by the
pre-measured drift value and the equivalent internal volume is displayed on the leak rate indicator after
sampling is completed.
9) Press the STOP key to change the leak unit to mL/min and return to Measurement mode.
9.1.5 Go/No Go judgement during leak calibration
1) Tester makes large leak judgement if the leak rate exceeds ±1000 Pa (or ±300 Pa as selected with a
memory switch) during DL2 stage.
Tester also makes No-Go judgement if the leak rate exceeds ±1000 Pa during the BAL stage or the
compensated leak rate exceeds ±1000 Pa in the DET stage.
2) An error,
E-7
, is displayed if the leak rate exceeds the full scale of the A/D converter.
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<Operation>
1) Press the SHIFT key in Measurement mode to display
SFt
on the leak indicator.
2) Press the CAL./COMP. key.
When you press the RIGHT
►
key,
oFS
will appear on the leak rate indicator, and the DPS output will
be displayed on the HI and LO leak limit indicators. This is the output under atmosphere.
If the equivalent internal volume is known, the
▲
UP and DOWN
▼
keys allow
manual entry. To enter an equivalent internal volume manually, press the
ENTER key and then press the STOP key to return to Measurement mode to
exit the setup.
NOTE
If the DPS reading exceeds 30 % of the full scale of the display, it can be
provisionally adjusted by turning its ZERO volume. If this measure does
not work, DPS may be contaminated. Contact manufacturer in such case.
CAUTION
Never touch the SPAN volume.
NOTE
