I had wondered about the battery doing just that and plan to try this with a better source. I was seeing a very brief jump of current and if the battery does indeed drop to nearly nothing under any load, then that might make sense.
The two 410Bs I have both use an EA53 and the other 11036A uses an EA53. This is the only probe I have that uses the 2-01C. It would be nice if I had another probe to test the 2-01C.
I'll try substituting a plain diode for the tube and see what that reveals.
Thanks,
Barry - N4BUQ
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----- Original Message -----
From: "Richard Knoppow" <dickburk@...>
To: [email protected]
Sent: Monday, July 29, 2019 1:55:18 PM
Subject: Re: [HP-Agilent-Keysight-equipment] Testing a 2-01C Diode
Try testing the probe with a solid state diode, nearly any
diode will do. Hook it up across the terminals for the tube with
correct polarity. See if it works. If it does the tube is
probably bad, if not the problem is something other than the
tube. Check your tube testing set up the same way. The 410B is a
very simple meter, essentially a DC meter with a series diode
rectifier for AC measurements.
You could also test the meter by putting a low DC voltage
across the diode output terminals.
Maybe your worn out 9V battery drops to zero with any sort
of load, I've found some like that. Try a plain old D cell.
On 7/29/2019 9:18 AM, n4buq wrote:
I tried setting up a test for the diode using approximately a 3VDC source
(a very weak 9V battery I happened to have on hand) with a 3.3K resistor
in series between the anode and cathode (naturally, with the heater
connected and sufficiently warmed up). I could not measure any voltage
across the resister regardless of the polarity of the source voltage. I
also tried it with the DVM in series with the resistor/voltage source and
still could not detect anything even close to 1ma.
Thinking that was more-or-less conclusive of a bad tube, I tried this with
a NIB EA53 (adjusting the heater voltage accordingly) and still could not
see any significant current flow regardless of the polarity of the source
voltage.
Unless _both_ tubes are bad (unlikely but I can test the EA53 in the
working probe to verify that one), then I think this test setup is somehow
invalid (although I don't see how with such a simple setup).
I'm not where I can get to my workshop for a while so can't report more
findings until I get back there but thought I'd pass this along.
Thanks,
Barry - N4BUQ
--
Richard Knoppow
dickburk@...
WB6KBL
