PRODUCT SHEET
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BIOPAC Hardware |
BioNomadix Series
| Page 20 - 26
Updated: 8.18.2020
BN-EDA ELECTRODERMAL CALIBRATION
Transmitter/Receiver set can be calibrated by applying a known resistance (conductance) to the EDA
electrode pinch connectors via alligator clips. Suggested values of conductance would be 0 µSiemens (infinite
ohms – no connection) and 10 µSiemens (100 K ohms). The EDA Transmitter/Receiver set o10 V for
a 50 µS measured conductance. The EDA Transmitter/Receiver set will output approxi2 V for a 10
µS measured conductance.
BN-NICO CALIBRATION
Mapping for Z:
0.8 V to 10 ohms
9 V to 100 ohms
The calibration values for Z are approximate. For a more
exact calibration for Z, introduce a 10 ohm resistor
between the paired leads (Iout, Vin+) and (Vin-, Iin) to
simulate a 10 ohm impedance magnitude. Use a 100 ohm
resistor to simulate a 100 ohm impedance magnitude. See
figure at right for details:
For the most accurate calibrations, use known impedances
(resistances) that bracket the expected high and low values
being recorded. For conventional noninvasive cardiac
output measurements, optimal low impedance is 15 ohms
and optimal high impedance is 40 ohms.
Mapping for dZ/dt
:
0 V to 0 ohms/sec
10 V to 10 ohms/sec
The calibration values for dZ/dt can be accomplished by introducing a known and varying resistance that can
be precisely set to a specific rate of change. For calibration related to cardiac output measurements, a varying
resistance of ±1 ohms/seconds to ±5 ohms/second is ideal. A photonically-isolated voltage controlled
resistance can be used for this calibration. A cadmium sulfide cell in parallel with a resistance of 25 ohms can
be employed in conjunction with a signal generator driven LED to provide a varying light intensity to
modulate the resistance of the cadmium sulfide cell.
BN-PPG AND BN-RSP PULSE AND RESPIRATION CALIBRATION
User-calibration not recommended
, as the measurements performed are essentially dimensionless.
However, it’s possible to calibrate the PPG Transmitter/Receiver set by introducing a variable gray-scale
density pattern to the PPG probe in a dark environment. The RSP Transmitter/Receiver set can be calibrated
by applying differing amounts of force to the RSP transducer/belt combination to stretch the belt over
different distances.
BN-SKT SKIN TEMPERATURE CALIBRATION
Insert probe into temperature well set to the appropriate temperature. As an alternative, replace the thermistor
with known temperature(s) that reflects the specific temperature(s) simulated. The temperature probe
specifications are equivalent to YSI@ 400 series probes. The temperature range for the SKT
Transmitter/Receiver set is 13 to 51 degrees C. Using the specified temperature probe: 13 degrees provides a -
10 V output and 51 degrees provides a +10 V output.