Digitimer NeuroLog NL108A 사용자 설명서 - 페이지 3

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Users Manual

With the port B stop-cock set to atmosphere, adjust the NL108A ZERO ADJ front panel potentiometer

so the 0V is recorded at the OUT sockets. (CALIB switch in OFF position and the pressure range toggle switch

in the 1.0V = 100mm position). Now switch the port B stop-cock so that the column of water is connected to the

transducer. The output of the NL108A should give an output of +1.0V, if the excitation voltage and sensitivity of

the transducer are correct.

transducer data sheet).

Deviations from 1.0V output (for the 1.36m pressure) can be adjusted with the trimmer on the NL108A

printed circuit board labelled GAIN. Small adjustments can also be made with the BRIDGE VOLTAGE setting -

but be careful not to exceed the limits for your particular transducer.

When correctly set up, pushing the OUT GND push-button should produce the same effect on the

output as opening port B to the atmosphere. Switching the CALIB toggle switch to its 1.0V position should also

produce the same output deflection as opening port B to the 1.36m column of water.

10)

Steps 6 and 9 can be repeated for the 100mV = 1cmH

column of water should be 10cm for 1.0V output deflection.

USE OF THE OUT GND AND CALIB SWITCHES

The OUT GND push-button is used to locate the zero pressure dc level on the output recording (some chart

recorders drift!). A 0.0V to 1.0V calibration deflection is produced on a recording trace by switching the CALIB

switch to 1.0V and pushing the OUT GND push-button a couple of times. Similarly for the 0.0V to 100mV

calibration deflection.

Specification

Input voltage range

Gain

DC offset

Bandwidth

O/P voltage range

O/P impedance

Bridge supply

First Issued: before July 1984

File Reference: N:\DOCS\COMPANY\MANUALS\NEUROLOG \ NL108A.SAM

Digitimer Ltd

E-mail: [email protected]

NeuroLog™ System

If not, check the BRIDGE VOLTAGE setting again (also double check the

: ±15V

: 1V/100mmHg or 100mV/cmH

(for a pressure transducer having an output of 50µV/mmHg)

: ±60cmH

O or ±40mmHg

(when switched to the appropriate range)

: DC - 150Hz

: ±12V

: 600ohms (nom)

except 'zero out', where O/P is s.c to ground

: 0-24V dc (25mA)

Last Revision: October 18, 2000

Page 3 of 3

Tel:+44 (0)1707 328347; Fax:...373153

O switch position. In this case, however, the

Printed:

Website: www.digitimer.com

NL108A

October 18, 2000