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Resisitor to evaluate baord testing connections-- 2 wire bioz measurement

Category: Hardware
Product Number: AD5940

Hi, I am wondering if this is the appropriate way of connecting resistors to the eval board when trying to test measurements. I have a differnt version of the board so i am unable to reference previous examples. Please could you confirm?

  • hi, just wanted to follow up once more  

  • Hi  ,

    Apologies for the late response. I will contact the product owner and get back to you.

    Thanks,
    Francis

  • Yes, you may connect resistor load like above.

  • Hi, thanks for getting back to me. I did and the result are not making sense so fat. here is what I see on the debug terminal -- this is a 1000  ohm resistor and I am measuring in 2 wire configuration. Any guidance would be helpful

    THIS DATA DOESNT LOOK RIGHT (USING A 10K RTIA, MEASUIRNG A 1K RES)

     app_timer: RTC: initialized.
     app: SoftDevice wants RAM start: 0x200024D0
     app: AD5940 ADIID: 0x4144 (expected 0x4144)
     app: AD5940 SPI OK
     app: RTIA Cal Real: 11108.86 Imag: -121.49
     app: BioZ BLE app started
     app: Fast advertising.
     app: DataCount: 4
     app: Freq: 10000.00
     app: Real(ohm): 2891.13 Imag: 1909.53
     app: Real(ohm): -1036.11 Imag: 1424.33
     app: Real(ohm): -1037.00 Imag: 1425.14
     app: Real(ohm): -1032.67 Imag: 1420.82
     app: DataCount: 5
     app: Freq: 10000.00
     app: Real(ohm): -1085.55 Imag: 1655.03
     app: Real(ohm): -1033.22 Imag: 1421.83
     app: Real(ohm): -1039.78 Imag: 1425.60
     app: Real(ohm): -1033.42 Imag: 1420.09
     app: Real(ohm): -1036.94 Imag: 1425.54
     app: DataCount: 4
     app: Freq: 10000.00
     app: Real(ohm): 2885.78 Imag: 1908.08
     app: Real(ohm): -1036.20 Imag: 1424.27
     app: Real(ohm): -1034.52 Imag: 1422.53
     app: Real(ohm): -1031.77 Imag: 1419.75
     app: DataCount: 4
     app: Freq: 10000.00
     app: Real(ohm): 2880.11 Imag: 1911.20
     app: Real(ohm): -1037.76 Imag: 1423.59
     app: Real(ohm): -1033.96 Imag: 1421.22
     app: Real(ohm): -1032.16 Imag: 1420.95
     app: DataCount: 4
     app: Freq: 10000.00
     app: Real(ohm): -1085.12 Imag: 1656.19
     app: Real(ohm): -1032.85 Imag: 1421.19
     app: Real(ohm): -1043.82 Imag: 1426.87
     app: Real(ohm): -1039.21 Imag: 1424.57
     app: DataCount: 4
     app: Freq: 10000.00
     app: Real(ohm): -1089.31 Imag: 1659.30
     app: Real(ohm): -1036.58 Imag: 1423.50
     app: Real(ohm): -1033.42 Imag: 1422.40
     app: Real(ohm): -1037.89 Imag: 1423.24
     app: DataCount: 4
     app: Freq: 10000.00
     app: Real(ohm): 2888.49 Imag: 1910.89
     app: Real(ohm): -1038.23 Imag: 1423.98
     app: Real(ohm): -1037.40 Imag: 1424.33
     app: Real(ohm): -1036.27 Imag: 1423.60
     app: DataCount: 4
     app: Freq: 10000.00
     app: Real(ohm): 2883.78 Imag: 1906.21
     app: Real(ohm): -1036.84 Imag: 1421.80
     app: Real(ohm): -1041.55 Imag: 1426.76
     app: Real(ohm): -1038.14 Imag: 1423.46
     app: DataCount: 4
     app: Freq: 10000.00
     app: Real(ohm): -1084.40 Imag: 1658.16
     app: Real(ohm): -1042.11 Imag: 1427.11
     app: Real(ohm): -1038.38 Imag: 1423.86
     app: Real(ohm): -1036.02 Imag: 1422.28
     app: DataCount: 4
     app: Freq: 10000.00
     app: Real(ohm): -1091.72 Imag: 1659.05
     app: Real(ohm): -1039.37 Imag: 1425.19
     app: Real(ohm): -1036.62 Imag: 1422.84
     app: Real(ohm): -1038.32 Imag: 1424.73
     app: DataCount: 4
     app: Freq: 10000.00
     app: Real(ohm): 2884.55 Imag: 1906.88
     app: Real(ohm): -1034.67 Imag: 1419.81
     app: Real(ohm): -1035.41 Imag: 1422.14
     app: Real(ohm): -1033.71 Imag: 1419.93