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Products => Test Equipment => Topic started by: snoopy on March 03, 2017, 12:11:24 am

Title: Tektronix P6245 Active Probe issues with config data
Post by: snoopy on March 03, 2017, 12:11:24 am
Hi

Just got a 2nd hand Tek P6245 Active Probe. Probe seems to work but the scope (TDS784A) cannot read the configuration data from the probe and as such cannot run a probe compensation procedure which results in "Probe comp failed".

I note that the probe has TDS500/600 written on it but I thought the newer scopes would still be able to read the data. What data is stored in the EPROM ?

Any thoughts ?

Cheers
Title: Re: Tektronix P6245 Active Probe issues with config data
Post by: snoopy on February 12, 2022, 12:07:55 pm
For those interested in this probe I have uploaded all of the information I have on it which includes schematics, EEPROM dumps etc.

cheers
Title: Re: Tektronix P6245 Active Probe issues with config data
Post by: d37duck on May 20, 2022, 03:11:25 pm
Hi snoopy,

Thanks for the Tek 6245 data download, nice work.  Please tell us what equipment you used and your procedure for recording the data.

Regards,
Title: Re: Tektronix P6245 Active Probe issues with config data
Post by: snoopy on July 04, 2022, 09:10:31 am
Quote from: d37duck on May 20, 2022, 03:11:25 pm
Hi snoopy,

Thanks for the Tek 6245 data download, nice work.  Please tell us what equipment you used and your procedure for recording the data.

Regards,

It was a while ago but I picked up a small EEPROM programmer from ebay I think called CH341A programmer and used that to read and write the data on the probe EEPROM (24C02). From memory I may have used EZ hooks connected directly to the pins on the probe scope connector whilst it was not connected to the scope of course. Supply required.

cheers
Title: Re: Tektronix P6245 Active Probe issues with config data
Post by: Mechatrommer on July 04, 2022, 10:11:50 am
mind to tell what was the issue with config data? i have the Tek P6245 probe but dont have a Tek scope. was bought faulty with some ribbon carbon traces broken... i wonder how Tek scope communicates with the probe? does the Tek scope modify the eeprom content during recalibration?
Title: Re: Tektronix P6245 Active Probe issues with config data
Post by: snoopy on July 04, 2022, 12:52:53 pm
Quote from: Mechatrommer on July 04, 2022, 10:11:50 am
mind to tell what was the issue with config data? i have the Tek P6245 probe but dont have a Tek scope. was bought faulty with some ribbon carbon traces broken... i wonder how Tek scope communicates with the probe? does the Tek scope modify the eeprom content during recalibration?

A couple of the probes had blank data so I copied data from a another working probe. Not sure how they got corrupted but that's how I got them. Oddly enough according to the schematic I mapped out, the WP pin appears to be floating. Not sure if it has an internal pullup ?

cheers