01-04-2013, 09:17 AM
Hi Al, I'm wondering then if old "blown" thermocouples can be replicated, there seems to be a fair selection of modern thermocouples available with various characteristics so a match might be possible, I would have thought that it's the heating element that fails, if that is so then it appears that the element wire/strip is still available? Maganin comes to mind.
In all this I am thinking say of someone who has a duff thermocouple on an old piece of test gear or an old WW2 transmitter then maybe a thermocouple assembly could be made up as a replacement to drive the meter, assuming that the meter movement is still ok.
The other thing that comes to mind is that it could form the basis for a Q meter assuming that a signal source of low enough impedance can be found or made, in that respect I wonder what the output impedance of a standard signal generator is before it hits the attenuator, if sufficiently low enough then maybe that output could be used, it could be the basis of an accurate homebrew Q meter?
Lawrence.
In all this I am thinking say of someone who has a duff thermocouple on an old piece of test gear or an old WW2 transmitter then maybe a thermocouple assembly could be made up as a replacement to drive the meter, assuming that the meter movement is still ok.
The other thing that comes to mind is that it could form the basis for a Q meter assuming that a signal source of low enough impedance can be found or made, in that respect I wonder what the output impedance of a standard signal generator is before it hits the attenuator, if sufficiently low enough then maybe that output could be used, it could be the basis of an accurate homebrew Q meter?
Lawrence.
