SU940742A1 - Apparatus for measuring electric resistance of human skin - Google Patents
Apparatus for measuring electric resistance of human skin Download PDFInfo
- Publication number
- SU940742A1 SU940742A1 SU802907601A SU2907601A SU940742A1 SU 940742 A1 SU940742 A1 SU 940742A1 SU 802907601 A SU802907601 A SU 802907601A SU 2907601 A SU2907601 A SU 2907601A SU 940742 A1 SU940742 A1 SU 940742A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- electric resistance
- human skin
- measuring electric
- resistance
- skin
- Prior art date
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- Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Description
Устройство работает следующим образом .The device works as follows.
При замкнутых электродах 2, 5 усилитель 1 охвачен глубокой обратной св зью, и нанр жение на его выходе равно напр жению источника 4, приложенн-ому к неинвертирующему входу зсилител . Поэтому измерительный мост находитс в состо нии равновеси , и ток через измеритель 6 тока не протекает. При измерении сопротивлени кожи между электродами 2, 5 равновесие моста нарушаетс . На выходе усилител но вл етс носто лное напр жение , величина которого повышаетс пр мо нроиорционально величине измер емого сопротивлени участка кожи, а измеритель 6 тока иоказывает величину этого сонротивлени в линейной шкале отсчета. Чем больше сопротивление участка кожи, тем выше выходное напр жение на выходе , и поэтому ток, протекающий в измерительной цепи, остаетс практически посто ииым независимо от величины сопротивлени участка кож:и.With the closed electrodes 2, 5, the amplifier 1 is covered by deep feedback, and the output at its output is equal to the voltage of source 4 applied to the non-inverting input of the force. Therefore, the measuring bridge is in a state of equilibrium, and the current through the current meter 6 does not flow. When measuring skin resistance between electrodes 2, 5, the balance of the bridge is disturbed. At the output, a voltage is amplified, the value of which rises directly to the value of the measured resistance of the skin, and the current meter 6 indicates the magnitude of this resistance in a linear scale of reference. The greater the resistance of the skin area, the higher the output voltage at the output, and therefore the current flowing in the measuring circuit remains almost constant regardless of the resistance of the skin area: and.
Благодар большому динамическому диапазону и коэффициенту усилени операционного зсилител при переходе на другой диапазон измерени сопротивление эталонного резистора не измен ют, а в цепь измерител тока 6 включают резистор 7 другого сопротивлени , при котором в ИОВОМ поддиапазоне измерени обеспечиваетс отклонение в измерителе 6 на всюDue to the large dynamic range and gain of the operating amplifier when switching to a different measurement range, the resistance of the reference resistor is not changed, and a different resistance resistor 7 is connected to the current meter circuit 6, where in the JOB the measurement subrange is provided
щкалу. Поэтому во всех диапазонах измерение сопротивлени кожи проводитс при посто нной величине тока, это создает одинаковые физиологические услови воздействи на ткани кожи, и следовательно, повышаетс точность измерени .sckalu Therefore, in all ranges, skin resistance measurement is carried out at a constant current value, this creates the same physiological conditions on the skin tissue, and consequently, the measurement accuracy is improved.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU802907601A SU940742A1 (en) | 1980-04-22 | 1980-04-22 | Apparatus for measuring electric resistance of human skin |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU802907601A SU940742A1 (en) | 1980-04-22 | 1980-04-22 | Apparatus for measuring electric resistance of human skin |
Publications (1)
Publication Number | Publication Date |
---|---|
SU940742A1 true SU940742A1 (en) | 1982-07-07 |
Family
ID=20888665
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SU802907601A SU940742A1 (en) | 1980-04-22 | 1980-04-22 | Apparatus for measuring electric resistance of human skin |
Country Status (1)
Country | Link |
---|---|
SU (1) | SU940742A1 (en) |
-
1980
- 1980-04-22 SU SU802907601A patent/SU940742A1/en active
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