Generic noise bridge calculator

This calculator solves for some interesting results from the measurements using a generic noise bridge which is calibrated for increasing pF either side of null, +ve for 'inductive' pF, -ve for 'capacitive' pF.

For the VK3AQZ RX1 / RX2 Noise Bridge, see RX1, RX2 Noise bridge calculator.

R (Ω)
C (pF)
Frequency (MHz)
Cnull (pF)
R0 (Ω)
Rexp (Ω)
Z (Ω)
Y (S)


Input fields

Note that the use of an expander resistor (say 200Ω) is popular with these type of instruments, in fact some have a built in resistor with switch. Whilst it does enable an expanded measuring range, it does that at the expense of accuracy. Do a check by varying the inputs a little in the calculator to determine sensitivity of results to small measurement errors.

Output fields

If you're clever, you will have worked out you can download this page to your hard disk. If you're smart, you won't, you will run it from the web site and automatically take advantage of any updates.

Common values for Cnull, Re:

Links / References

Other tools.

© Copyright: Owen Duffy 1995, 2017. All rights reserved. Disclaimer.