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TD744A Probe cal storage

David Slipper All Messages By This Member #149130 Every time I power up my 'scope it complains that two (and only two) probes have changed and "do you want to use the existing cal data or re-cal". If I choose to use the existing cal data it works fine, or if I recalibrate the probe it works fine too but I still get challenged the next time I power up. Do I need to "enable write access" to the nvram when I re-cal a probe ?? Or is the nvram failing ?? The 'scope is working fine in all other respects. Best regards, Dave
Dave Casey All Messages By This Member #149131 I believe this is normal. It will do this anytime you connect a probe that has readout scaling or power up with any connected. My 754C does the same thing. Dave Casey toggle quoted message Show quoted text On Sat, Jun 23, 2018 at 3:49 AM, David Slipper <softfoot@...> wrote: Every time I power up my 'scope it complains that two (and only two) probes have changed and "do you want to use the existing cal data or re-cal". If I choose to use the existing cal data it works fine, or if I recalibrate the probe it works fine too but I still get challenged the next time I power up. Do I need to "enable write access" to the nvram when I re-cal a probe ?? Or is the nvram failing ?? The 'scope is working fine in all other respects. Best regards, Dave
David Slipper All Messages By This Member #149132 The thing is - I have 4 identical probes on this 4 channel 'scope - but only 2 channels do this. Regards, Dave toggle quoted message Show quoted text On 23/06/2018 10:17, Dave Casey wrote: I believe this is normal. It will do this anytime you connect a probe that has readout scaling or power up with any connected. My 754C does the same thing. Dave Casey On Sat, Jun 23, 2018 at 3:49 AM, David Slipper <softfoot@...> wrote: Every time I power up my 'scope it complains that two (and only two) probes have changed and "do you want to use the existing cal data or re-cal". If I choose to use the existing cal data it works fine, or if I recalibrate the probe it works fine too but I still get challenged the next time I power up. Do I need to "enable write access" to the nvram when I re-cal a probe ?? Or is the nvram failing ?? The 'scope is working fine in all other respects. Best regards, Dave .
EricJ All Messages By This Member #149133 David, try switching the two probes on the channels that do this with the two that don't so you can check whether the problem is with the scope channels or with the probes. --Eric Sent from my Samsung Galaxy S8. toggle quoted message Show quoted text -------- Original message --------From: David Slipper <softfoot@...> Date: 6/23/18 7:25 AM (GMT-06:00) To: [email protected] Subject: Re: [TekScopes] TD744A Probe cal storage The thing is - I have 4 identical probes on this 4 channel 'scope - but only 2 channels do this. Regards, Dave On 23/06/2018 10:17, Dave Casey wrote: I believe this is normal. It will do this anytime you connect a probe that has readout scaling or power up with any connected. My 754C does the same thing. Dave Casey On Sat, Jun 23, 2018 at 3:49 AM, David Slipper <softfoot@...> wrote: Every time I power up my 'scope it complains that two (and only two) probes have changed and "do you want to use the existing cal data or re-cal". If I choose to use the existing cal data it works fine, or if I recalibrate the probe it works fine too but I still get challenged the next time I power up. Do I need to "enable write access" to the nvram when I re-cal a probe ?? Or is the nvram failing ?? The 'scope is working fine in all other respects. Best regards, Dave .

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