Agilent Technologies VS Series Operation Manual page 41

VS Series Helium Mass Spectrometer Leak Detectors
LCD Display
Leak Rate Bar Graph
VENT
TEST
Represents:
Leak Rate - in a Bar Graph format with a numeric range
❑
indicator
Leak Rate, System Status and Parameters - in alphanumeric
❑
format
Series of
screens
❑
interface
Leak Rate, System Status and Parameters in alphanumeric format:
Leak Rate is presented in a scientific notation: XXE-YY with
❑
appropriate units
Where: X .X mantissa is a leak rate value
E- Y = 10-YY exponent is a leak rate range
X and Y are any numbers from 0 to 9
System Status and/or Mode are represented on the screen in
❑
alpha format on the screen and an italic font in this manual
Parameters are represented on the screen in alphanumeric
❑
format a bold font in this manual.
The large bar graph displays the leak rate in one of three forms:
A linear bar graph
❑
A logarithmic bar graph
❑
Both linear and logarithmic bar graphs
❑
Use the Output Control Set-Up screen (Section 3.1.8.3.1 "Cal Leak
Expiration Set-Up" on page 3-23) to change the type of bar graph
that appears.
Over-range and under-range conditions are indicated using two up
and down arrows on the right and left side of the bar graph, respec-
tively.
The VENT button advances the leak detector to the vented state. A
red LED illuminates while the leak detector is in the vented state.
When the system is in the Vent or Hold states, pressing the TEST
button automatically advances the leak detector through roughing,
then through the various test states, depending on the achievable
test port pressures and leak rates. A green TEST LED in the button
illuminates when the leak detector is in the Test or Fine Test state.
Press the VENT button to isolate the test port from the leak detector
vacuum system and vent the test port to atmosphere. The red VENT
LED remains lit while the leak detector is in the vented state. To
activate the VENT function, press and hold VENT for one second.
with the soft key buttons for operator
1-19