INFICON Protec P3000(XL) Helium Leak Detector - Manual (Page 80)

4-25
Equipment Settings
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26
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20
9)
Converting a trigger leak
rate to a trigger output
voltage
If you want to know the corresponding voltage for a specific trigger leak rate, the
following formula applies:
U = 3 + 2·log (mantissa of scientific notation of trigger value)
(The factor of 2 is used since one decade is spread over 2 Volts. The summand of 3
is used because the trigger level will always be within the range of 3 to 5 V).
Example
Recorder Output
In linear output scale different settings can be chosen in the submenu RECORDER
OUTPUT . The voltage range spans from 0 V to 10 V.
The recorder output can be set so that the max. 10 V corresponds to either 1 x 10
-4
mbar l/s, 1 x 10
-3
mbar l/s, 1 x 10
-2
mbar l/s, 1 x 10
-4
Torr l/s, 1 x 10
-3
Torr l/s,
1 x 10
-2
Torr l/s. Alternatively, the recorder otuput can be set so that 10 V
corresponds to 10 x trigger level, i. e. 1 V equals the selected trigger level.
In the modes "E RROR ”, "N OT READY TO MEASURE ” and " STANDBY ” a voltage of
U = 10 V will be output through channels 1 and 2.
Default setting: AUTO
4.5.3 RS232 Protocol
The RS232 protocol can be set to “ ASCII ”, “ DIAGNOSTICS ”, “ PRINTER AUTO ” or “ PRINTER
MANUAL ”. The ASCII protocol is a protocol similar to the SCPI, a standard protocol
widely used for measuring equipment. For details on this protocol please refer to the
Interface Description (kins26e1).
Default setting: ASCII
Diagnostics
The DIAGNOSTICS protocol is a binary protocol used by INFICON for analysis in quality
control and trouble shooting during manufacturing and service.
Trigger leak rate Scientific notation Mantissa Trigger voltage
2*10
-5
mbarl/s 2*10
-5
2 3+2·log(2) = 3.6 V
5 g/a 5*10
0
5 3+2·log(5) = 4.4 V
0.4 oz/yr 4*10 -1 4 3+2·log(-1) = 4.2 V