Varian 990 dCLD II, Руководство по эксплуатации

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Model 990 dCLD II Component Leak Detector
4-2
➃
Zero The ZERO button is used to initiate a function that zeros the leak
rate. The LED illuminates while Zeroing is taking place.
➄
Read Standard Leak The READ STANDARD LEAK button is used to verify calibration by
exposing the internal calibrated leak to the system. The LED illumi-
nates while the function is taking place.
➅
Calibrate The CALIBRATE button is used to initiate an automated calibrate
function. The LED illuminates while calibration is taking place.
➆
Audio
Volume Control The Audio Volume Control buttons are provided to change the vol-
ume level of the audio leak rate indication.
➇
Key Switch The three-position key switch, SET-UP/RUN/SERVICE, is used to
access and control operational parameters, as well as
service-related functions
NOTE
These panel items are not operational:
4.1 Control Buttons
The ZERO button is functional only when the key switch is in the SET-UP or
SERVICE positions, and when PARALLEL ENABLE is off.
Press the ZERO button to cause the 990 dCLD II to read the background leak
rate signal, store the reading in memory, and then reset the zero reference point.
While zeroing is taking place, ZEROING displays on the HOME screen operat-
ing state line and the ZERO button LED indicator lights.
NOTE
Pressing the ZERO button while you are introducing helium
tracer gas to the test object could result in the suppression of a
real leak. Only use the ZERO button after the helium tracer gas
source has been removed.
❑
Test Port Pressure Bar Graph (displays as full)
❑
SNIFFER ON/OFF button
❑
VENT button
❑
TEST/HOLD button
The LED above the TEST/HOLD button lights when
the System is ready, it does not refer to the function
of the button.