Quote:
Originally Posted by Radio Wrangler
Have you had a look at the lab-grade bridges made by Wayne-Kerr?
These measure conductance and susceptance separetely, at teh same time. You could use the same system without their ultra-precision decade transformers and just use 10-turn pots for balancing the bridge.
The clever bit is that their AC voltmeters (two of them) don't simply rectify the unbalance signal, they use synchronous detectors, essentially diode bridges commutated by the same oscillator signal which drives the bridge. The output of these rectifiers will be zero on balance, but will show negative one side of balance, and positive the other side.
[snip]...
https://www.vintage-radio.net/forum/...d.php?t=133081
They are quite a looker, and in terms of lab-cred, score you almost as many points as a Jacob's ladder running in the corner, certainly equal to the score achieved by a scope left running a Lissajous figure.
David |
Recently acquired a slighty newer Wayne-Kerr bridge, it's currently in the repair queue as it neither DVM seems to be working other then being stuck showing zeros.
The advert has a bit of artist exaggeration for the symbol display, they are in reality only small sections with filament lamps behind, guessing they didn't make a readout-bulb* with all the correct symbols required.
I'm guessing this is the precision transformer you were referring too.
Also need to find some triax connectors & cable to make up proper test leads for it.
*don't want to use the correct name, as I don't want to help people that are only interested in removing them.
David