Model 979 Series Helium Mass Spectrometer Leak Detector
2-24
DRAFT 9/15/03
2.6.6 Output Control Set-Up
Touch the OUTPUT CONTROL SET-UP box to display the Output Control Set-Up screen
(Figure 2-13). From this screen, select the desired leak rate output, BARGRAPH DISPLAY
mode, and the RS-232 communication protocol.
Figure 2-13
Output Control Set-Up Screen
2.6.6.1 Leak Rate Analog Output Voltage Selection
Touch the Output toggle box located at the top left of Output Control Set-Up screen to
switch the output voltage at the I/O port on the back of the leak detector between
1V/DEC LOG OUTPUT and LINEAR ANALOG OUTPUT.
1V/DEC LOG
OUTPUT
The output voltage conversion chart is displayed in Figure 2-14.
LINEAR ANALOG
OUTPUT
The output voltage conversion chart is displayed in Figure 2-15.
2.6.6.2 Bargraph Display Set-Up
Touch the Bargraph Display toggle box to switch the bar graph display between
LOG BARGRAPH DISPLAY mode and LINEAR BARGRAPH DISPLAY mode.
LOG BARGRAPH
DISPLAY
In the LOG BARGRAPH DISPLAY mode, the 50-segment bar graph
display represents the entire leak rate range of the leak detector,
spanning from 10
−
11
atm cc/sec to 10
0
atm cc/sec. The numerical
display, located to the upper right of the bar graph, is not lit in this
mode.
LINEAR BARGRAPH
DISPLAY
In the LINEAR BARGRAPH DISPLAY mode, the 50-segment bar
graph display represents the mantissa value of the leak rate, span-
ning from 0 to 10. The numerical display, located to the upper right
of the bar graph, indicates the leak rate exponent value. This mode
offers exceptional resolution within a decade.
9600
OUTPUT CONTROL SET-UP
BAUD
1 STOP
BIT
NO
PRTY
DONE
IV/DEC
LOG
OUTPUT
LINEAR
BARGRAPH
DISPLAY
SERIAL PORT
BACK
LEAK RATE
OUTPUT
CAL
TRANSFER
LEAK
SET-UP
AUTO
SEQUENCER
SET-UP
RANGING
SET-UP
CONTROL
SET-UP
NEXT
POINTS
SET-UP
ROUGH
PUMP
SET-UP
REJECT &
AUDIO SET
POINTS
Summary of Contents for 979 Series
Page 139: ......
