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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
For evaluating the measurement signal with the built-in digital display it is important
that the trimmer ADJ. on the right next to the display is turned fully clockwise. The multi-
turn potentiometer has 19 turns and no fixed limit stop.
The digital display is normalised with ADJ. turned fully clockwise. The range of ±10 Volt corresponds to a
reading of ±1000. The decimal point is disregarded. You can now consider the displayed value as ±10.00
Volt or as ±100.0% of the measuring range.
The transducer calibration is therefore very simple on the TAM-D. Similar to the example
in the calibration description for the TAM-A, a range of 200mmHg and a reference loading
on the transducer of 100 mmHg is assumed. This corresponds to a calibration of 100mmHg
per 5 Volt.
The next step now is to set the digital display on the TAM-D so that it displays the value in units of use.
Here e.g. 100 (mmHg). Apply the calibration reference e.g. 100mmHg again to the
transducer and adjust the digital display with the ADJ trimmer so that you get 100 on the
display. Now your output should show 100mmHg on the display and deliver 5 Volt on the output BNC
socket. If you have set the display to show one decimal you will not be able to adjust the display to more
than 50.5. Please remove the module and remove the decimal point jumper (J1). Now you are able to
display 100.
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The last step is to set the CAL value which can simulate a preset value on the TAM output. Set switch
CAL-OFF-MEASURE to CAL position. A freely set static calibration value e.g. 100mmHg can at any time
be simulated on the signal output of the TAM. Set switch CAL-OFF-MEASURE to CAL position. Turn on
the CAL trimmer so that your display shows the choosen simulation value e.g. 100 (mmHg). If you switch
now to CAL your TAM-D always simulates 100mmHg on the display and on the output.
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6.1.4 Transducer calibration on a TAM-D with using the digital display (procedure for users who
don´t have a digital voltmetern nor a DAQ system
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With no load on the transducer, carry out an approximate zero adjustment manually with the trimmers
ZERO-COARSE first and then ZERO-FINE. Adjust Zero so that your digital display shows almost zero.
Detailed description:
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Start the AUTOZERO function by pressing the AUTO button in MEASURE MODE until the LED ZERO
goes on, for precise zeroing. The LED ZERO must automatically go off after a few seconds and not be
flashing at the end of the adjustment (no error, zero adjustment OK!).
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Using a pressure calibrator, apply the calibration reference e.g. 100mmHg to the transducer without alter-
ing the position of the transducer (zero error).
Take the litle red screwdriver which was delivered with the system and adjust on the
GAIN 20-100% trimmer the gain so that you see e.g. 500 on your TAM-D Display. The output now must
deliver 5V.
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The next step now is to set the TAM-D digital display so that it displays the value in units of use.
Here e.g. 100 (mmHg). Apply the calibration reference e.g. 100mmHg again to the
transducer and adjust the digital display with the ADJ trimmer so that you get 100 on the
display. Now your output should show 100mmHg on the display and deliver 5V on the
output BNC socket
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The last step is to set the CAL value which can simulate a preset value on the TAM output. Set switch
CAL-OFF-MEASURE to CAL position. A freely set static calibration value e.g. 100mmHg can at any time
be simulated on the signal output of the TAM. Turn on the CAL trimmer so that your display shows e.g. 100
(mmHg). If you switch now to CAL your TAM-D always simulates 100mmHg on the display and on the
output.
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