Digitimer NeuroLog NL108A Руководство пользователя - Страница 2
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Users Manual
Set Up
The NL108A is supplied calibrated for any of our supplied NeuroLog™ pressure transducers which have a
stated accuracy. If a more precise calibration is required, or a different transducer is to be used, you will need to
perform the following procedure.
1)
Check the data sheet of the particular transducer you wish to use with the NL108A for its EXCITATION
VOLTAGE at its rated output (in the case of the NeuroLog™ transducers this is 10.0V). The NL108A is
designed so that the excitation voltage may be varied between 0 and 11 volts with the preset mounted on the
board. This is so that damaging voltages cannot be applied to the NeuroLog™ transducers. If voltages up to 24
volts are required a single resistor change is required - see circuit diagram and assembly drawings for the
NL108A.
2)
Attach a good isolated voltmeter between the two pins on the NL108A printed circuit board marked
BRIDGE VOLTAGE + and -. The voltages at these pins are symmetrical above and below 0V (i.e. ground or
earth). DO NOT GROUND EITHER OF THESE TWO PINS. In general, an oscilloscope is not accurate
enough to use in setting the excitation voltage - use a good voltmeter.
3)
Plug the NL108A module into the rack with the power OFF, leaving several empty bays to the left of the
module so that the trimpot marked set bridge voltage can be adjusted. DO NOT CONNECT THE PRESSURE
TRANSDUCER YET.
4)
Switch on the NL900 rack and adjust the set bridge voltage trimmer to give the correct excitation voltage
at the bridge voltage pins.
5)
The pressure transducer can now be plugged into the NL108A module and the voltmeter disconnected
after ensuring no drop in voltage.
TO NL108
6)
Attach a three-way stop-cock to each of the two points of the transducer as shown in the diagram. One
of these stop-cocks (A) is closed. The second, at port B, is set up so that it can either vent the port to the
atmosphere (i.e. zero pressure), or set to connect the port to a piece of 3 or 4mm inside diameter plastic tubing.
The tubing is suspended vertically and filled with water to a height of 1.36 meters (the pressure exerted by a
1.36m column of water is equal to that for a 100mm column of mercury).
Digitimer Ltd
E-mail: [email protected]
NeuroLog™ System
TRANSDUCER
Page 2 of 3
Tel:+44 (0)1707 328347; Fax:...373153
1.36m
A
B
Copyright © 1996-2000
Website: www.digitimer.com
NL108A
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