Re: [time-nuts] PM6681 PROMs v109
On 11/13/2020 2:21 PM, ew via time-nuts wrote: Having contacted several time nuts off list to cut down traffic but no response will some one tell me the battery number covered and number of cells so I am properly prepared to exchange. Bert The backup battery really has nothing to do with the PROMs (Subject of this thread). It backs up, when the counter has no AC power, a section of SRAM memory. That memory holds a calibration constant that affects the accuracy of the counter's interpolation method for measurements. This memory also holds more mundane things like save and recall of counter user setups. The backup battery is a single standard CR2032-style lithium 3V coin cell. To open the case there are 3 torx head screws. One in the bottom center (T10 size) and two at the back plastic feet (T20 size). I started the opening process by prying with a small screwdriver in the cracks between the plastic front panel and the case. To keep the RAM memory intact, the counter must have AC applied and be in Standby. To remove the battery the holder has openings toward the front of the counter where you gently pry up the battery. I used a plastic screw driver adjustment tool. The new battery easily slides in the way the old one came out. For maximum long term goodness avoid touching the new cell with bare hands (possibly a bit too anal-retentive). Hopefully a small pic I took of the battery location will be attached. -Rex ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] PM6681 PROMs v109
The 3V cell is a BR2032 190mAh 20x3.2 [mm] (page 7-8 of the service manual). On Sat, Nov 14, 2020 at 12:11 AM ew via time-nuts wrote: > > Having contacted several time nuts off list to cut down traffic but no > response will some one tell me the battery number covered and number of > cells so I am properly prepared to exchange. > Thanks Bert Kehren In a message dated 11/13/2020 4:37:29 PM > Eastern Standard Time, r...@sonic.net writes: > I have a Fluke PM6681 Counter On the ko4bb site there is an image of the > counter's v1.05 PROMs. I just pulled the v1.09 PROMs from my counter and read > out the contents. I have placed the result > here:http://www.xertech.net/pm6681/Fluke_PM6681_Counter_PROM_v109.zip Anyone > interested, please download. If you see any issues or improvement > suggestions, please let me know. If all is well in a few days I'll look into > uploading this to ko4bb. Back story below I have been following and > participating in the thread "Frequency Counter Choice". There has been a long > discussion about the PM6681/Cnt-81 counter, mostly about saving and restoring > one calibration parameter that gets lost if the internal backup battery dies. > A method was described, but currently seems unresolved if the restore method > works as hoped. This promped me to open my PM6681 and ensure the battery was > good. Having done that, I knew about the v1.05 PROM image but had never seen > a v1.09 image. I decided to unplug the AC power and carefully remove the two > v1.09 PROMs from my counter. I read out their contents with a > reader/programmer tool I have. I returned the PROMs to my counter, applied > AC, and the counter seems to be working fine. The link provided above is my > sharing of the results of this exercise. > ___time-nuts mailing list -- > time-n...@lists.febo.comTo unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.comand follow the > instructions there. > ___ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] PM6681 PROMs v109
Having contacted several time nuts off list to cut down traffic but no response will some one tell me the battery number covered and number of cells so I am properly prepared to exchange. Thanks Bert Kehren In a message dated 11/13/2020 4:37:29 PM Eastern Standard Time, r...@sonic.net writes: I have a Fluke PM6681 Counter On the ko4bb site there is an image of the counter's v1.05 PROMs. I just pulled the v1.09 PROMs from my counter and read out the contents. I have placed the result here:http://www.xertech.net/pm6681/Fluke_PM6681_Counter_PROM_v109.zip Anyone interested, please download. If you see any issues or improvement suggestions, please let me know. If all is well in a few days I'll look into uploading this to ko4bb. Back story below I have been following and participating in the thread "Frequency Counter Choice". There has been a long discussion about the PM6681/Cnt-81 counter, mostly about saving and restoring one calibration parameter that gets lost if the internal backup battery dies. A method was described, but currently seems unresolved if the restore method works as hoped. This promped me to open my PM6681 and ensure the battery was good. Having done that, I knew about the v1.05 PROM image but had never seen a v1.09 image. I decided to unplug the AC power and carefully remove the two v1.09 PROMs from my counter. I read out their contents with a reader/programmer tool I have. I returned the PROMs to my counter, applied AC, and the counter seems to be working fine. The link provided above is my sharing of the results of this exercise. ___time-nuts mailing list -- time-n...@lists.febo.comTo unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.comand follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] PM6681 PROMs v109
I have a Fluke PM6681 Counter On the ko4bb site there is an image of the counter's v1.05 PROMs. I just pulled the v1.09 PROMs from my counter and read out the contents. I have placed the result here: http://www.xertech.net/pm6681/Fluke_PM6681_Counter_PROM_v109.zip Anyone interested, please download. If you see any issues or improvement suggestions, please let me know. If all is well in a few days I'll look into uploading this to ko4bb. Back story below I have been following and participating in the thread "Frequency Counter Choice". There has been a long discussion about the PM6681/Cnt-81 counter, mostly about saving and restoring one calibration parameter that gets lost if the internal backup battery dies. A method was described, but currently seems unresolved if the restore method works as hoped. This promped me to open my PM6681 and ensure the battery was good. Having done that, I knew about the v1.05 PROM image but had never seen a v1.09 image. I decided to unplug the AC power and carefully remove the two v1.09 PROMs from my counter. I read out their contents with a reader/programmer tool I have. I returned the PROMs to my counter, applied AC, and the counter seems to be working fine. The link provided above is my sharing of the results of this exercise. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
