EEVblog Electronics Community Forum
Products => Test Equipment => Topic started by: e61_phil on June 08, 2015, 06:40:18 pm
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Hello,
I have a Hioki 7005 DC Standard which works fine. Know, I would like to control this unit over GPIB.
I've tried to connect to the unit via "Agilent Connection Expert" and an Agilent 82357B USB to GPIB adaptor. But the uni isn't shown under GPIB devices. My HP3478A is however shown although it is also not react to *IDN?
After that, I've build a litle LabView tool which sends "F1R5P0L2O1D10000" (a control string for the Hioki) on every GPIB adress from 1 to 31. But no reaction on the Hioki unit and an error message on every adress. I've checked the LabView tool with a HP 53131A which was reacting.
The Hioki 7005 has 5 DIP-Switches under the GPIB connector labeled with A1 to A5. I've tried unsuccessfully different DIP settings.
Has anyone a hint what could be wrong here? Is there a "trick" with such old equiment?
Thanks
Philipp
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Thanks Mojo-Chan
I've wrote an email to hioki for a while and ask for the manual, but nobody answered. Today, I've created a myhioki account and was able to download the manual :)
Sadly there is nothing new in the manual. I know the address setting with the DIP-switches know, but I think I had done everything like described in the manual already.
I noticed another thing toady: If my HP 53131A is runing together with the Hioki DC Standard (on another adress of course) the national instruments MAX (I switched to an NI PCI-GPIB card but nothings changes) can't read the *IDN? string. The 53131A is still detected but without further communication. The Hioki isn't shown in the devices list but it seems to me, that the hioki is disturbing the GPIB-Bus..
Hmm, perhaps the GPIB-Interface is broken? I thougt this is very unsual on a working device.
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I made a basic check on the GPIB-Interface:
- 5V power supply looks fine
- I've tested the GPIB Transceiver (two MC3447) on a breadboard with an LED as load. They also work in both directions.
Too bad :(
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Thanks Mojo-Chan
I've wrote an email to hioki for a while and ask for the manual, but nobody answered. Today, I've created a myhioki account and was able to download the manual :)
Sadly there is nothing new in the manual. I know the address setting with the DIP-switches know, but I think I had done everything like described in the manual already.
I noticed another thing toady: If my HP 53131A is runing together with the Hioki DC Standard (on another adress of course) the national instruments MAX (I switched to an NI PCI-GPIB card but nothings changes) can't read the *IDN? string. The 53131A is still detected but without further communication. The Hioki isn't shown in the devices list but it seems to me, that the hioki is disturbing the GPIB-Bus..
Hmm, perhaps the GPIB-Interface is broken? I thougt this is very unsual on a working device.
Definitely sounds like a broken interface. The hioki should not interfere with the other device having a different address. Also, any addressable device should be identifiable as being present on the bus due to the fact that it will (should) handshake when addressed as a listener. If NI max is not identifying the presence of the device then it isn't working.
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Ok :(
Is there a good point to start a repair? Some parts which often fail?
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Attached a photo of the GPIB interface board.
It's a bit tricky to measure signals because of the other boards direct next to the gpib-interface.
I've measured the clock of the M5L8085 and it seems to be ok.
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I made some more simple tests:
- without the MC68488 on the board there are no gpib disturbances
- without the 8085 even the NI max software is hanging
I've measured the DB0 Pin on the MC68488 (see photo attached) and there is traffic. So I hope the RAM, ROM and the CPU are fine. I will simply try to replace the MC68488 with a new one.
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Did you try reseating all the socketed chips on the GPIB board?
I see that there are 4 LEDs on the GPIB board. Does the manual say anything about their functions?
Ed
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Yes, I reseated all socketed chips.
The 4 LED are labeld as RMT, SRQ, TLK, LSN. Nevertheless, none of these LEDs has shined anytime.
I've ordered a "new" MC68488 from ebay...