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Method of equivalent circuit used on HP 4284A LCR meter

Dr. David Kirkby from Kirkby Microwave Ltd #3978 There has been some discussion about the best way to represent data measured as impedance, into an equivalent circuit. The most comprehensive of these I have seen, which my company owns, is my obsolte HP 4284A precision LCR meter. which is not a VNA, but measures the impedance of a device using a 4-wire Kelvin measurement. This means everything shown here could conceivably be displayed. Someone might want to implement all or a subset of these. I'm not suggesting they are all implemented - I am just listing them for possible discussion. I suspect my HP 4285A LCR meter (75 kHz to 30 MHz) does the same, but I have not checked. HP 4284A 1 MHz LCR meter. Cp-D - a parallel capacitance Cp, with a dissipation fact D Cp-Q - a parallel capacitance Cp, with a Q of Q Cp-G - a parallel capacitance Cp, with a conductance G Cp-B - a parallel capacitance Cp, with a susceptance B Cp-Rp - a parallel combination of a capacitance Cp, and resistance Rp Cs-D - a series capacitance Cs, with dissipation factor Q Cs-Q - a series capacitance Cs, with a Q of Q Cs-Rs - a series combination of capacitance Cs and resistance Rs Lp-D - a parallel inductor, with a dissipation factor D Lp-Q - a parallel inductor, with a Q of Q Lp-G - a parallel inductor, with a conductance of G measured in siemens Lp-Rp - a parallel combination of an inductance Lp and resistance Rp. Ls-Q - a series inductor Ls, with a Q of Q Ls-Rs - a series inductor Ls with resistance Rs R - X - I don't need to explain what that is. Z-theta (degrees) - The magnitude and phase of an impedance expressed in degrees. Z-theta (rad) - The magnitude and phase of an impedance expressed in radians. G-B - G is the conductance measured in siemens (admittance Y = G + j B) Y-theta (degrees) the magnitude of the admittance Y, and phase angle expressed in degrees Y-theta (rad) the magnitude of the admittance Y, and phase angle expressed in radians -- Dr David Kirkby Ph.D C.Eng MIET Kirkby Microwave Ltd Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, CHELMSFORD, Essex, CM3 6DT, United Kingdom. Registered in England and Wales as company number 08914892 Tel 01621-680100 / +44 1621-680100
Rune Broberg All Messages By This Member #4034 Hi David, thanks for the list! That's a lot of ways to display the same couple of numbers ;-) But I'm sure all very useful. I'll keep it around for future reference :-) -- Rune On Fri, 4 Oct 2019 at 17:14, Dr. David Kirkby from Kirkby Microwave Ltd < drkirkby@...> wrote: There has been some discussion about the best way to represent data measured as impedance, into an equivalent circuit. The most comprehensive of these I have seen, which my company owns, is my obsolte HP 4284A precision LCR meter. which is not a VNA, but measures the impedance of a device using a 4-wire Kelvin measurement. This means everything shown here could conceivably be displayed. Someone might want to implement all or a subset of these. I'm not suggesting they are all implemented - I am just listing them for possible discussion. I suspect my HP 4285A LCR meter (75 kHz to 30 MHz) does the same, but I have not checked. HP 4284A 1 MHz LCR meter. Cp-D - a parallel capacitance Cp, with a dissipation fact D Cp-Q - a parallel capacitance Cp, with a Q of Q Cp-G - a parallel capacitance Cp, with a conductance G Cp-B - a parallel capacitance Cp, with a susceptance B Cp-Rp - a parallel combination of a capacitance Cp, and resistance Rp Cs-D - a series capacitance Cs, with dissipation factor Q Cs-Q - a series capacitance Cs, with a Q of Q Cs-Rs - a series combination of capacitance Cs and resistance Rs Lp-D - a parallel inductor, with a dissipation factor D Lp-Q - a parallel inductor, with a Q of Q Lp-G - a parallel inductor, with a conductance of G measured in siemens Lp-Rp - a parallel combination of an inductance Lp and resistance Rp. Ls-Q - a series inductor Ls, with a Q of Q Ls-Rs - a series inductor Ls with resistance Rs R - X - I don't need to explain what that is. Z-theta (degrees) - The magnitude and phase of an impedance expressed in degrees. Z-theta (rad) - The magnitude and phase of an impedance expressed in radians. G-B - G is the conductance measured in siemens (admittance Y = G + j B) Y-theta (degrees) the magnitude of the admittance Y, and phase angle expressed in degrees Y-theta (rad) the magnitude of the admittance Y, and phase angle expressed in radians -- Dr David Kirkby Ph.D C.Eng MIET Kirkby Microwave Ltd Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, CHELMSFORD, Essex, CM3 6DT, United Kingdom. Registered in England and Wales as company number 08914892 Tel 01621-680100 / +44 1621-680100

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