Products > Test Equipment
HP 5335A Timer / Counter - Anything i should know?
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Orange:

--- Quote from: Dr. Frank on May 26, 2014, 08:27:25 am ---Change A4C36 from 10µ/10V to 22..47µ/10V. Correct value depends on tolerances in the circuitry, and on the capacitors leakage current.
This will increase "Gate Mode NORM"  time from (20ms..4s) to ca. (50ms..12s), delivering max. 10 digits instead of max. 9 only.

--- End quote ---

Nice addition, I noticed that I get 11 digits now when it has to display 10.000002399 for example. It is clever in a way, because it jumps automatically from the
10. 000 000 00 notation to the ones without blanks. HP did now how to write software in the old days  :)
Wim13:

--- Quote from: Vgkid on May 26, 2014, 05:49:13 am ---
--- Quote from: Dr. Frank on May 21, 2014, 09:27:09 pm ---
Well I tweaked  one electrolytic, which controls the manual gate time, so that I could measure up to 12.5secs, (instead of only 1s), to get 10 digits from the front panel.
Otherwise, GPIB control would do the job, up to 11 digits.
Frank

--- End quote ---
Can you go into detail on this.

--- End quote ---

You can do this also by hand, use the manual open/close push button, under gate mode.
if you leave the gate open for hundreds of seconds you get more digits.

Dr. Frank:

--- Quote from: Wim13 on May 26, 2014, 04:18:41 pm ---You can do this also by hand, use the manual open/close push button, under gate mode.
if you leave the gate open for hundreds of seconds you get more digits.

--- End quote ---

That's correct. 100s will give 11 digits resolution, but that's it.
For even longer times, say 1000s, the counter will not output more than 11 digits plus the trailing "1" maybe, neither on the display, nor over the GPIB.

That's a pity, as the counter internally counts and calculates to 20 digits, or so.



Dr. Frank:
Following a hint from the usual manual storage, the version 1.1 can be identified by the start up message of the GPIB address.
The (additional) decimal point before the address is displayed only for the V1.1

I got a 1988 counter, but 1987 firmware, presumably already the V1.1, although it is still in two EPROMs. Well, now I wonder if I should see 2 decimal points...

Perhaps owner of the old version may take a notice if the GPIB address is completely without decimal points.. I.e. "HP-IB Addr 18" or

"HP-IB Addr. 18"


And what is the "MK 36000 time bomb"?
Orange:
OK, so I changed the EPROMS from V1.0 to V1.1. Initially done some tests on Channel A  and B, and all seems fine...

Later today I checked Channel C  :palm:  With a 100MHz signal it displays 320MHz !, 1200MHZ gives 3840MHz on the display !

I presume that the later units have a different division factor for the Channel C board which is compatible with V1.1
I could not find this in the documentation.

So its back to V1.0 :(
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