How to Configure the 270 Instrument
Chapter Four: Operation
38
3. Plug the power cable from the 270 instrument into a 115 VAC - 60 Hz power source.
For a 230 VAC - 50 Hz power source, the power entry module must be set to the proper
voltage. Refer to the How to Change the Line Voltage Selection section, beginning on
page 40.
4. Apply power to the 270 instrument by placing the Power switch in the
ON
position.
5. If you are using the 270 with a single pressure sensor, place the
SENSOR RANGE
position the switch in the full scale value of the sensor in use.
If you are using the 270 with the 274 multiplexer unit, position the
SENSOR RANGE
switch in the
MPX
position. Place the
HEAD RANGE IN TORR
switches, on the 274, to
the full scale value of the sensor in use, for each channel.
6. Position the
DISPLAY UNITS
selector switch in the mmHg position.
7. If you are using the 270 with a single pressure sensor, place the
HEATER
switch to the
REG
position.
If you are using the 270 with the 274 multiplexer unit, place the
REG HEATER
switches,
on the 274, to the
ON
position. Place the
REG
switch on the 270 in the
OFF
position.
This step applies power to the proportional heater circuit in the sensor. There will be a
small delay between the closing of this switch and the lighting of the
HEATER
lamp.
The lamp will turn on brightly and then, after the sensor warms up, the lamp will go to a
lower intensity. Allow a minimum of four hours to stabilize a “cold” sensor. If possible,
leave the heat on the sensor overnight. For optimal performance, leave the heater on
constantly.
8. Place the
RESPONSE
switch in the
STD
position.
The
STD
position offers the best all-around response versus noise performance for
pressure measurement. Select the
FAST
position when you need a fast (1 millisecond)
response. Select the
SLOW
position when reducing the amount of noise level on the
DC output is more important than the system response time.
9. Position the
RANGE SELECT
switch in the
NULL
position.
If necessary, adjust the
NULL
control to produce a zero reading on the front panel
display or on an external display.
10. To calibrate the 270 instrument to its internal Full Scale standard, position the
RANGE
SELECT
switch in the
F
.
S
. position.
If necessary, adjust the
F
.
S
. control to produce a full scale reading of 10000 on the
front panel display or an external display.
11. Pump the system to a pressure below the resolution of the pressure sensor.
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