Page 22
HUGO SACHS ELEKTRONIK - HARVARD
A P P A R A T U S
GmbH D-79232 March-Hugstetten Germany
HSE PLUGSYS
®
TAM-A Type 705/1 and TAM-D Type 705/2
Application note:
Adaptation of a blood pressure transducer to a PLUGSYS TAM-A module
Before using a blood pressure transducer (e.g. APT300, P75…) together with a Transdcuer
Amplifier Module TAM-A or TAM-D you have to do some adjustments and to perform a cali-
b r a t i o n .
As the different transducers deliver a different voltage signal first the GAIN on the amplifier
board must be set. Therefore you have to pull out the module from the housing. To do that
just open the upper and the lower screw (with a PHILIPS screwdriver) on the front panel
and pull the module out.
Coarse GAIN is adjusted on the jumper row J2.
Set GAIN for the transducers as follows:
APT300
x 2 0 0
P23XL
x 2 0 0
P75
x 5 0
After you have installed the jumper in position install the module back in the housing and
close the screws. Switch on main power and connect the transducer to the module.
TAM-A basic settings:
•
Lowpass Filter on 300 Hz
•
Move the switch CAL/OFF/ MEASURE in MEASURE position
First step is the Zero adjustment:
•
Remove load from the transducer, open horizontal por t on APT300 or P75 transducers
to air
•
Adjust Zero by pressing the AUTO ZERO button on the TAM module for 3 seconds
•
The red LED light above the button lights up during automatic zero adjustment. If
the module can not adjust zero the red LED light starts blinking, first is to check if
switch CAL/OFF/ MEASURE is really in MEASURE position.
•
If the module can not adjust Zero you have to adjust Zero manually with the
COARSE trimmer below to the AUTO ZERO button. Take the delivered little red screw-
driver and adjust zero, so that you see only one bar on the bargraph module at zero
position. If you have a voltmeter available, connect it to the OUTPUT BNC socket.
Zero Pressure should lead to 0V on the output.
•
After manual adjustment repeat ZERO adjustment by pressing again the AUTO ZERO
button for 3 seconds. This time the module should be able to adjust Zero automati-
cally. LED is no longer blinking.
Upper Calibration point / setting of measuring range
First you should think about the measurement range you intend to use. The range is the
area where you expect your measured signals.
In case of arterial blood pressure a range up to 200mmHg is in most cases good. (In case of
measuring on hypertensive species 300mmHg is recommended).
The range and the GAIN (amplification) run contrary. If you use more GAIN the range gets
smaller, if you use less GAIN the range gets larger. This means if you have e.g. to change
the range from 200mmHg to 300mmHg you have to reduce the GAIN to get a larger range.
