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Post by jmariano on Sept 6, 2019 9:15:50 GMT -5
Dear all,
I'm in Brazil. We have an old 421 gaussmeter with a MMT-6J04 probe. The probe is not working (421 shows the message "probe not connected"). I know for sure that it is the probe because I have try the gaussmeter with another probe installed on our VSM and the instrument works fine. We really need the probe working since we have urgent measurements to preform but if we buy one (and we will), it is going to take at least one month for the probe to arrive. I would like to give it a try fixing the probe. So my question is, is there an easy way to tell is the problem is a broken wire or is it is the eprom that was erased or is malfunctioning? The wire I can fix.
Thanks
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Post by Lake Shore Ogi on Sept 6, 2019 9:32:50 GMT -5
Hello!
Unfortunately there is not much that can be done since the probes are permanently assembled/epoxied. You can inspect the wiring inside the connector shell to see if one of the wires somehow broke loose and check their solder connections. If the problem is within the probe stem or the Hall sensor at the tip, there is regretfully nothing you can do to fix it.
Greetings,
Ogi K.
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Post by jmariano on Sept 9, 2019 8:29:16 GMT -5
Ok Ogi, thanks for the information.
How about the eprom? What are the chances of it being broken (erased?) due, eventually, to misuse. Can i test it?
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Post by Lake Shore Ogi on Sept 9, 2019 9:01:19 GMT -5
Hello!
There is always a possibility for the EEPROM to fail but I don't think that we're dealing with this issue here. Please measure the resistance across [Pins 8 and 15] and also [Pins 1 and 9]. I'm guessing that one of the pairs is going to measure open in your case but normally they should measure between 2 and 4 Ohms.
Best Regards,
Ogi
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Post by jmariano on Sept 9, 2019 11:22:11 GMT -5
Great, Thanks!
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Post by jmariano on Sept 10, 2019 13:05:44 GMT -5
Hello Ogi,
Pins 8-15 and 1-9 read around 2 ohms, as you said, but pins 4-5, which I think is the temperature sensor, read open circuit.
Any ideas?
Mariano
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Post by Lake Shore Ogi on Sept 10, 2019 15:14:43 GMT -5
Hello Mariano,
I spoke to one of our engineers after seeing your response. The resistance appears perfect and there is no temperature sensor installed on this probe so that is fine too. He advised that this particular model does look into the EEPROM and your initial suspicion is most likely correct, which is that the EEPROM is dead. Regretfully, there is nothing "quick" that can be done. If we had the probe here at the factory, we would replace the EEPROM and re-calibrate the probe.
-Ogi K.
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Post by jmariano on Sept 11, 2019 13:28:09 GMT -5
Ok Ogi, thank for the reply. I'll talk to my boss here. Maybe we can send the probe to you for repair, but, depending on the price, we will buy a new one. Shall I contact your sales person to get a quotation?
Mariano
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Post by Lake Shore Ogi on Sept 11, 2019 14:37:57 GMT -5
Hi Mariano, You might be better off buying a new one because you'll pay a lot for the transit and customs import/export fees. This you can further discuss with our rep listed below, as they have handled this many times and will have better information than I do. If you have any other technical questions, please contact me/us at support@lakeshore.com ANALOG-LAB Serviços e Tecnologia Ldiva - EPP www.analoglab.com.brinfo@analoglab.com.br Phone: +55 11 4612 4387 Rua Nazira 74, Cotia-SP, CEP 06708-150, Brazil Greetings, Ogi K. |
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Post by jmariano on Sept 12, 2019 7:12:04 GMT -5
Hi Ogi,
Thanks very much for your help.
Regards
Mariano
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Post by Lake Shore Ogi on Sept 12, 2019 15:06:22 GMT -5
Of course!
-Ogi K.
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Post by munirashraf9821 on Aug 18, 2023 6:18:32 GMT -5
Dear all, I'm in Brazil. We have an old 421 gaussmeter with a MMT-6J04 probe. The probe is not working (421 shows the message "probe not connected"). I know for sure that it is the probe because I have try the gaussmeter with another probe installed on our VSM and the instrument works fine. We really need the probe working since we have urgent measurements to preform but if we buy one (and we will), it is going to take at least one month for the probe to arrive. I would like to give it a try fixing the probe. So my question is, is there an easy way to tell is the problem is a broken wire or is it is the eprom that was erased or is malfunctioning? The wire I can fix. Thanks Hello ,Munasir here , It 's unfortunate to hear about the probe malfunctioning, especially during urgent times. If you've isolated the issue to the probe, first inspect the physical connections and the wire for any obvious signs of wear or breakage. If the wire appears intact, you can check its continuity using a multimeter. If there's a break, you should be able to detect it this way. If the wire is not the issue, it might be more complicated, like an issue with the internal components or the EEPROM. If you're not familiar with the probe's intricate workings, I'd advise caution when poking around to avoid causing further damage. Good luck, and hopefully, you can get your measurements done in time!🔧🧲 Cheers, Munasir. |
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Post by munirashraf9821 on May 2, 2024 9:17:45 GMT -5
Dear all, I'm in Brazil. We have an old 421 gaussmeter with a MMT-6J04 probe. The probe is not working (421 shows the message "probe not connected"). I know for sure that it is the probe because I have try the gaussmeter with another probe installed on our VSM and the instrument works fine. We really need the probe working since we have urgent measurements to preform but if we buy one (and we will), it is going to take at least one month for the probe to arrive. I would like to give it a try fixing the probe. So my question is, is there an easy way to tell is the problem is a broken wire or is it is the eprom that was erased or is malfunctioning? The wire I can fix. Thanks To troubleshoot whether the issue with your MMT-6J04 probe is due to a broken wire or a malfunctioning EPROM , you can perform a simple continuity test on the probe's wiring. Use a multimeter set to the continuity test mode and check for continuity along the length of the probe's cable. If there is continuity throughout the wire, the issue may lie with the EPROM or other internal components of the probe. However, if there is a break in continuity at any point along the wire, then the problem is likely due to a broken wire that needs repair or replacement. Once you've identified and fixed any broken wires, retest the probe to see if it resolves the "probe not connected" issue with your gaussmeter. |
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