Equipment Settings 71
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 + 2ꞏlog (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,
1x10
-2
Torr l/s. Alternatively, the recorder otuput can be set so that 10 V corres-
ponds to 10 x trigger level, i. e. 1 V equals the selected trigger level.
In the modes "E
RROR”, "NOT 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.
Printer manual
The
PRINTER MANUAL protocol allows to send leak rates on pressing the right sniffer
probe button.
Notice When in any of the two printer modes, no ASCII commands must be sent
to the Protec P3000 as this will interrupt the printer mode.
Trigger leak rate Scientific notation Mantissa Trigger voltage
2*10
-5
mbarl/s 2*10
-5
2 3+2ꞏlog(2) = 3.6 V
5 g/a 5*10
0
5 3+2ꞏlog(5) = 4.4 V
0.4 oz/yr 4*10
-1
4 3+2ꞏlog(-1) = 4.2 V
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