Products > Test Equipment
HP 5335A Timer / Counter - Anything i should know?
max_torque:
Wow, nice to get the precision Osc & high speed channel C options! Less good about the shoddy shipping and subsequent damage |O
The more i see how clean and undamaged my unit is, the more i'm convinced it's lead a sheltered life in some air-conditioned and filtered test system somewhere!
Thomas:
For a GPIB interface, you should consider this:
http://galvant.ca/shop/gpib-usb-adapter-rev3/
Low cost, $59 on sale now 8)
I got one for my Racal Dana 1992 Universal Counter, haven't really gotten around to testing it properly.
But I get some response on the counter, the REM and ADDR leds light. Just played around in a terminal.
Shows up as a serial port on the computer.
Edit:
Oooh, almost forgot: nice instrument you got there!
Vgkid:
--- 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.
Dr. Frank:
--- 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 ---
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.
Edit: I assembled a 22µF/10V Ta capacitor for 12.5s max.
In later versions, HP replaced all the tantalums they used before.
Orange:
Hi,
Attached you will find V1.1 EPROM images. My HP5335 counter was equipped with V1.0 firmware in two ROM sockets, so I split-up the V1.1 from an 27128 into two MCM68764 EPROMS.
Main changes for this firmware are related to the HP-IB section.
This is also a safe upgrade to get rid of the MK36000 time bomb.
Works OK in an 'old' style 5335 with two ROM sockets.
Edit : Beaware of the Channel C prescaled factor; V1.0 has a division ratio of 20. The version here posted requires a div. by 64
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