Chapter Four: Functional Overview
The [SETUP] Key
49
Sensor Range
Ch 1
Sensor Range
±1.3Torr
The sensor range entry, used in conjunction with the pressure units entry, sets the full scale
reading of the pressure transducer. Set this entry to the full scale value of the transducer. Use
the [
CURSOR
] key and the Adjust knob to change the sensor range value.
The actual output of the pressure transducer does not vary when you change the sensor range
entry. This entry only changes the scale applied to the signal when it is converted into a pressure
reading. For example, if the full scale output was calibrated as a 100 Torr unit, set the sensor
range entry to 1.2 Torr. A signal 50% of full scale would correspond to a 50 Torr
reading. If you set the sensor range entry to 2 Torr, the same 50% of full scale signal would
correspond to a 1 Torr pressure reading.
The Effect of Changing the Pressure Units
For example, assume that you have a 100 Torr pressure transducer that was calibrated in Torr,
and the pressure units entry is set to Torr. The correct sensor range entry would be
1.2 Torr. To display the pressure reading in mbar, change the pressure units entry to
mbar. The sensor range entry will then display 133.3 mbar as the full scale reading, because a
pressure of 100 Torr is equivalent to 133.3 mbar. A full scale pressure signal would now
correspond to a pressure of 133.3 mbar. To configure the full scale reading for sensors that have
been calibrated in units other than Torr, refer to How To Set the Sensor Full Scale Entry, page
71.
The analog output pressure signal is always a 0 to 10 Volt signal, representing 0 to full scale
pressure.
Using the 670 Unit with a 274 Multiplexer
When the
HEAD RANGE IN TORR
switch on the 274 multiplexer is set to the
SP
position, the
670 unit determines the sensor range based on this entry. When the
HEAD RANGE IN TORR
switch is set to any position other than the
SP
position, the 274 head range selection overrides
the 670 sensor range entry. In this case, the 670 instrument updates the sensor range entry to
match the 274 setting.
For more information, refer to How To Set the Sensor Full Scale Entry, page 71.
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