Models 947, 948 and 960 Leak Detectors Operations and Service Manual
3-11
3.4 Calibration and Sensitivity Checks
At the beginning of each workday or shift, or as conditions require, verify 947/948/960
integrity by performing the Calibration and Sensitivity Check
procedure. Compliance with
this procedure prepare your detector for normal daily operation. If the
NOT READY
LED
comes on during calibration, refer to the condition code that appears in the leak rate
exponent display shown in Figure 3-3.
Figure 3-3
Exponent Display with Condition Code Indicated
➀
Condition Code
Exponent area with condition code displayed.
Table 3-1 lists the Not Ready condition codes and the action to take to correct the error
condition.
➀
Table 3-1
NOT READY Condition Codes
Code
Problem Solution
c0
Amplifier Offset is
out of range
Notify Varian Vacuum Technologies Customer Service. Spectrometer
Tube Amplifier needs service.
c2
Rough pump is off
Turn on the rough pump.
c4
No emission
Select the other ion source filament. Replace ion source if necessary.
Refer to Section 4, “Maintenance” on page 4-1.
c5
Auto calibrate function is
out of range
Notify Varian Vacuum Technologies Customer Service. Leak detector
requires maintenance.
c6
Auto tune function is
out of range
Tap the AUTO CAL button. (A brief tap may clear this code to allow
the leak detector to operate.) If this clears c6 then the leak detector is
operable. If c5 appears with c6 it is the priority condition code.
Press
VENT
to clear.
NOTE: A c6 condition code means that maintenance of the leak
detector may soon be necessary. Notify Varian Vacuum Technologies
Customer Service at 1-800-8VARIAN.
c7
Auto Zero function is
out of range
Notify Varian Vacuum Technologies Customer Service. Leak detector
requires maintenance.
c8
Power interruption
Perform a Calibration and Sensitivity Check. This condition code may
be accompanied by an intermittent c9 indication.
c9
System pressure is
too high
Check for vacuum leaks. Refer to Section 4, “Maintenance” on
page 4-1.
Summary of Contents for 948
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