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Can't test LED with HP34401A
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tautech:
Get the right tool for the job.



wmundstock:

--- Quote from: tautech on March 10, 2024, 10:02:54 pm ---Get the right tool for the job.

--- End quote ---

Thank you for the reply tautech, I do have other meters that are capable of doing this test, however, because I recently bought a 34401a, I wanted to test and learn its specifics ;D.
TimFox:
As you found in the manual, the programming for the 34401A will recognize a diode if 0.3 V < V < 0.8 V.
This allows the machine to distinguish between
  a short circuit with 0.3 V > V
  a diode with 0.3 V < V < 0.8 V  and
  an open circuit with 0.8 V < V
The physical voltage with V > 0.8 V at 1 mA will be limited by the design of the current source, but is roughly 7 V max.
These three possibilities are a reasonable set of conditions for a good or damaged silicon PN diode.
Kean:

--- Quote from: wmundstock on March 10, 2024, 09:53:40 pm ---In fact, I just referred to the manual one more time, and it is actually stated but I did not know how to read it.

To Check Diodes
Test current source: 1 mA
Maximum resolution: 100 μV (range is fixed at 1 Vdc)
Beeper threshold: 0.3 volts ≤ Vmeasured ≤ 0.8 volts (not adjustable)

--- End quote ---

I adjusted your bold highlighting.  The text now in bold is the key thing.
In diode mode, the measurement range is fixed at 1VDC - so this meter cannot measure Vf beyond 1V.
wmundstock:
Thanks for the replies, that clears out my questions.
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