Models 947, 948 and 960 Leak Detectors Operations and Service Manual
1-8
13
Smaller/Larger Exponent
Selection Buttons
When Manual Range changing is selected:
SMALLER
decreases the leak rate exponent.
LARGER
increases the leak rate exponent.
Holding the
SMALLER
or
LARGER
button down for more
than 3 seconds (wait for the exponent to begin flashing)
stores the value of the manual range exponent in EPROM.
The range changes one decade each time a button is
pushed.
14
Start Button
Press to initiate test mode.
15
Vent Button
Press to initiate vent mode. This allows a test device to be
connected to the 947/948/960 for leak detection.
16
Zero Button
Press to initiate auto-zero sequence. The leak detector
automatically zeroes a negative signal.
17
Std Leak Button
Press to initiate Std leak check. Opens the standard leak
test valve so that the calibrated leak can be measured to
check the leak detector.
18
Auto Cal Button
Press to initiate automatic calibration check. The system
must be in TEST mode to initiate Auto Cal. During the
check, all front panel pushbuttons are disabled. The
947/948/960 transitions back to TEST mode at the
completion of the Auto Cal routine.
19
LED Display Area
Refer to Section 3, “Operation” for definitions of the LEDs.
