Products > Test Equipment
Flood of new Agilent 82357B GPIB-USB adaptors on eBay the real deal?
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Noise Floor:
FWIW I ordered one early, appears to work well.  Not sure if I'll keep it or scrap it.
Thanks to High Voltage for the images of real vs. fake.
orin:

--- Quote from: N8AUM on September 16, 2015, 06:08:55 am ---So far so good with the 82357B GPIB USB Interface-Compatible that cost me $51 DELIVERED in 5 days from China !

Had no problems when I hooked up my 53131 but had change the "Agilent 488 properties" in order to use the programs from KE5FX for my old 8591E.

I opened it up and was surprised how well it looked, no complaints from me  :-+

In my opinion it was well worth the $51

--- End quote ---


I have been trying one out and my labview program that used the VISA trigger function failed whereas the "Agilent" version from the same seller had been working fine.  I changed the trigger method and the program worked again.

The instrument is an HP 3456A and it is initialized with T4.  A gpib trigger should cause it to take a reading which I then read with the VISA read function.  The read times out with this clone adapter.  The alternative trigger is to write "T3" to the instrument.  In this case, the instrument does take a reading and the VISA read succeeds.

 The Agilent(Keysight) IO monitor shows the VISA trigger command succeeding and the VISA read command timing out.  Given that the Agilent branded adapter does work, it is probably a firmware bug in the adapter.

I noted that when the Agilent branded adapter is plugged in, it comes up as vid:pid 0957:0518.  The firmware is loaded by the driver and the adapter disconnects/reconnects as 0957:0718 with product string "82357B".

When the so called clone is plugged in, it immediately comes up as 0957:0718 and has product string "H82357"... so its firmware is built in.

Is it worth the $51?  Perhaps if you are writing your programs from scratch.  If not, I'd say all bets are off.  I will communicate this problem to the ebay seller.

I have not managed to make either of these adapters work at all on Windows 10 (cannot find instruments) and just don't ask about mixing Agilent IO libraries with NI Visa...

Edit: clone and IO libraries 17 seem to work on 2012 Server R2 - at least it finds an instrument and Keysight Interactive IO can communicate with a 3456A.  Interactive IO can't do trigger command so that problem hasn't been tested yet.

N8AUM:
orin,
Sorry to hear that the "$51 special" isn't working out for you. The seller does allow returns but I wonder how much that would cost ?
Do you have any other devices you can hook up and try ?
Wish I knew more about this subject but these gizmos weren't around back in the vacuum tube days when I was in school so I am trying to learn LOL
Good luck !


 
orin:

--- Quote from: N8AUM on September 25, 2015, 11:52:09 pm ---orin,
Sorry to hear that the "$51 special" isn't working out for you. The seller does allow returns but I wonder how much that would cost ?
Do you have any other devices you can hook up and try ?
Wish I knew more about this subject but these gizmos weren't around back in the vacuum tube days when I was in school so I am trying to learn LOL
Good luck !


 

--- End quote ---


Oh, I'm not concerned about returning the device.  This problem was easy enough to work around.  I will try a different instrument... Mr 5335A, your turn!

I did reproduce the problem with a different computer, OS (2012 Server R2) and different 3456A.  (The log file from Keysight IO Monitor is attached as a .txt file; it's actually xml if the forum lets it through.  It shows the assert trigger succeeding, but the following read failing.)


Edit (9/28/15):  Message sent to seller on eBay on 9/26) about the trigger problem.  No response as yet.
bingo600:
Did anyone try the $51 clone with linux-gpib ?

I have an "Agilent" (prob a clone) , and 2 Beimings , that both work excellent with linux-gpib.

I worked with Beiming, to get their versions to work with linux-gpib.
So i know they had to change something in their firmware to make it compatible with the way the "Agilent" behaved under linux-gpib.

A non working linux-usb would be a 100% showstopper for me.

/Bingo
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