DaveC wrote in
:

Does the fact that both show ~ 0.6 v-drop rule out zeners?

Thanks.



You sound like a man who imagines that by scrunchign his shoulders, no-one
will mind when he passes annopyingly several times through the same doorway.


And no. To test a zener you need to try a reverse voltage. Try a variable
voltage through a 10K resistor. A sine wave off a 30V transformer will do,
just look for the clipping voltages on a scope (or DC voltmeter if you add a
capacitor in parallel with the diode). Vz equals peak-peak voltage minus
about 0.58V. You may also have to remove one end of it from the circuit to be
certain.