How To Interface to the Type 274 Multiplexer
Chapter Five: Operation
70
Configuring the 274 Multiplexer
1.
Place the
CHANNEL SELECT
switch in the
REM
position.
This allows the 670 instrument to select the active channel.
2.
Place the
TEMP COMP
switch (on the left-hand side), in the
OUT
position, for each
channel.
This allows the 670 instrument to set the temperature compensation. Refer to the discussion
of the temperature compensation screen, page 50, for details.
3.
Turn the
REG HEATER
switch
ON
to control the heater power, if necessary. Set this
switch for each channel on the 274 multiplexer.
The Heater screen in the [
SETUP
] menu allows the 670 instrument to provide power to the
transducer heater. Refer to Heater, page 47, for a discussion of the heater function.
4.
Place the
HEAD RANGE IN TORR
switch, for each channel, in the
SP
position.
This allows the 670 instrument to set the sensor range. Refer to Sensor Range, page 49, for a
complete discussion.
5.
Plug in the power cord on both the 670 instrument and the 274 multiplexer.
Configuring the 670 Instrument
To configure the 670 instrument, complete steps 3 through 6 in How To Configure the 670
Instrument, page 67.
Note
If you are using heated transducers, turn the Heater entry OFF (in the
Setup menu). The 274 multiplexer, rather than the 670 instrument,
supplies power to heat the transducers.
If the 670 instrument has not been calibrated, complete the steps outlined in How To Calibrate
the 670 Instrument, page 72. If the 670 instrument has been calibrated, you only need to zero
each channel with a transducer connected. Steps 11 through 15 on page 73, describe the zero
procedure.
Refer to How To Set the Sensor Full Scale Entry, page 71, if you need to change the full scale or
pressure unit entries.
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