Agilent Technologies 947 Betriebs- Und Servicehandbuch Seite 41

Models 947, 948 and 960 Leak Detectors Operations and Service Manual
1 Volume Control
2 Display Button
3 Rough Pump Power
Switch
4 Detector Power Switch
5 System Pressure
Bar Graph
6 Transfer to Fine Test
Switch
7 Display Set Point Button Displays the transfer-pressure set point on the Test Port
8 Test Port Pressure
Bar Graph
9 Leak Rate Exponent
Display
10 Leak Rate Mantissa Bar
Graph
11 Leak Rate Over
Indicator
12 Auto/Man Mode Switch Selects automatic ranging or manual ranging. When in the
Controls the volume of the audible leak rate signal.
Displays the selected reject level of the leak detector
using the 50-segment leak rate bar graph and the
appropriate range exponent.
Controls the power to the roughing pump.
Controls the power to the backing pump and high
vacuum pump.
Displays system pressure monitored at the inlet of the
spectrometer tube on a 20-segment bar graph. The green
portion of the graph indicates normal operating vacuum
level.
Holds the leak detector in gross leak mode in the
NO position. In the AUTO position, it transfers into fine
test mode.
Pressure bar graph.
Displays the test port pressure as measured by a
thermocouple gauge mounted near the test port. Used as
an indicator to help prevent damage to the detector due to
over-pressure situations.
Indicates the leak rate range exponent in a two-digit
numeric display. Capable of showing 10
range in atm cc/sec. The RANGE EXPONENT is also used
to display the error condition code.
A 50-segment bar graph. The left most segment indicates
0.0 and is on at all times.
Goes on when the upper limits of the Leak Rate scale
have been exceeded.
AUTO position, the display starts each test sequence in
the least sensitive range, and ranges down to the most
sensitive range. When in the MAN position, the operator
selects a single range to display the range manually.
−11
0
range to 10
1-7