How do you measure bias with no source resistors?

[damuffin]

If your really lazy and In a fiddling mood you can use a laser temperature gauge on your big heat sink. I don’t recommend this method for first time bias, but if you think it’s a little hot or a little cold this is by far the easiest.

 

[Mark Johnson]

FLIR camera is even easier, and it gives you a softcopy record (photograph) of the reading.

 

[wrenchone]

A while ago, I nabbed a Fluke Y8100 clamp-on DC current probe on E-pray. This is what we used at my last job for power supply current measurements without breaking the line to insert an ammeter. It plugs into your standard DVM and outputs a voltage that is a function of current.

 

[Extreme_Boky]

Like this?

one resistor is fine; don't need two.

 

[GKTAUDIO]

Perfect, thank you. I suspected that after posting the image, figuring placement might depend on enhancement vs. depletion mode FETs (d vs. s).