RTC & Drift

I am using the d21g and the integrated RTC for time.

We are finding a very large drift ( 30-50 ms/sec) leading (we go ahead in time)

This seems very high as it adds up to minutes over a week.

Now I know I can calibrate it - but I would have anticipated that would only be required in the most extreme circumstances and I expected the crystal to be more accurate than this.

 

Appreciated

Colin Ragush
Colin Ragush
27
| 0 0 0
Asked on 7/25/19, 2:04 PM
0
vote
195 Views

Hi Loic,

We have quite a list here - we did keep records (for the most part)

For the total units

AR00006548
AR0000634
AR0000644
AR0000550
AR0000650
AR0000779
AR0000456
AR0000548
AR0000629
AR0000613
AR0000533
AR0000556
AR0000624
AR0000464
AR0000620
AR0000546
AR0000608
AR0000462
AR0001908
AR0001919
AR0001857
AR0001875
AR0002246
AR0002337
AR0002339
AR0001885
AR0002340
AR0001953
AR0001932
AR0002035
AR0001983
AR0002330
AR0002074
AR0002071
AR0002097
AR0001969
AR0002055
AR0002058
AR0002266
AR0002073
AR0002350
AR0002282
AR0002276
AR0001990
AR0001905
AR0001906
AR0001946
AR0001899

Top boards associated

(not all recorded)

R00002116
R00001684
R00002054
R00001960
R00001966
R00002044
R00002032
R00002130
R00001640
R00000799
R00000735
R00002136
R00000665
R00002100
R00002160
R00002154
R00001686
R00002034
R00000733
R00000667
R00001678
R00000674
R00002102
R00002092
R00001968
R00002182
R00002106
R00002004
R00000682
R00000730

If there is more information let me know. we haven't done a full investigation with respect to some working and some not as we have only noticed the ones that fail.

most of our systems update the RTC to an NTP server once an hour and so we don't see the drift. However, we see the drift when the NTP call has failed repeatedly (which we have had happen to systems)

Colin Ragush
on 8/1/19, 3:10 PM

I realized afterwards instead of forum – you requested e-mail

 

We have quite a list here - we did keep records (for the most part)

For the total units

AR00006548
AR0000634
AR0000644
AR0000550
AR0000650
AR0000779
AR0000456
AR0000548
AR0000629
AR0000613
AR0000533
AR0000556
AR0000624
AR0000464
AR0000620
AR0000546
AR0000608
AR0000462
AR0001908
AR0001919
AR0001857
AR0001875
AR0002246
AR0002337
AR0002339
AR0001885
AR0002340
AR0001953
AR0001932
AR0002035
AR0001983
AR0002330
AR0002074
AR0002071
AR0002097
AR0001969
AR0002055
AR0002058
AR0002266
AR0002073
AR0002350
AR0002282
AR0002276
AR0001990
AR0001905
AR0001906
AR0001946
AR0001899

Top boards associated

(not all recorded)

R00002116
R00001684
R00002054
R00001960
R00001966
R00002044
R00002032
R00002130
R00001640
R00000799
R00000735
R00002136
R00000665
R00002100
R00002160
R00002154
R00001686
R00002034
R00000733
R00000667
R00001678
R00000674
R00002102
R00002092
R00001968
R00002182
R00002106
R00002004
R00000682
R00000730

If there is more information let me know. we haven't done a full investigation with respect to some working and some not as we have only noticed the ones that fail.

most of our systems update the RTC to an NTP server once an hour and so we don't see the drift. However, we see the drift when the NTP call has failed repeatedly (which we have had happen to systems)

 

 

From: Loic De Buck <connect@industruino.com>
Sent: August 1, 2019 11:11 AM
To: Colin Ragush <cragush@islandwatertech.com>
Subject: Re: RTC & Drift

 

A new answer for RTC & Drift has been posted. Click here to access the post.

--
Industruino
Sent by Industruino using Odoo about Forum Post RTC & Drift

Colin Ragush
on 8/1/19, 3:13 PM

Hi Loic,

 

Is there any other questions regarding our controllers?

 

Is there any other information required?

 

Best,

 

Colin

 

From: Colin Ragush
Sent: August 1, 2019 12:14 PM
To: Industruino <catchall@industruino.com>
Subject: RE: RTC & Drift

 

I realized afterwards instead of forum – you requested e-mail

 

We have quite a list here - we did keep records (for the most part)

For the total units

AR00006548
AR0000634
AR0000644
AR0000550
AR0000650
AR0000779
AR0000456
AR0000548
AR0000629
AR0000613
AR0000533
AR0000556
AR0000624
AR0000464
AR0000620
AR0000546
AR0000608
AR0000462
AR0001908
AR0001919
AR0001857
AR0001875
AR0002246
AR0002337
AR0002339
AR0001885
AR0002340
AR0001953
AR0001932
AR0002035
AR0001983
AR0002330
AR0002074
AR0002071
AR0002097
AR0001969
AR0002055
AR0002058
AR0002266
AR0002073
AR0002350
AR0002282
AR0002276
AR0001990
AR0001905
AR0001906
AR0001946
AR0001899

Top boards associated

(not all recorded)

R00002116
R00001684
R00002054
R00001960
R00001966
R00002044
R00002032
R00002130
R00001640
R00000799
R00000735
R00002136
R00000665
R00002100
R00002160
R00002154
R00001686
R00002034
R00000733
R00000667
R00001678
R00000674
R00002102
R00002092
R00001968
R00002182
R00002106
R00002004
R00000682
R00000730

If there is more information let me know. we haven't done a full investigation with respect to some working and some not as we have only noticed the ones that fail.

most of our systems update the RTC to an NTP server once an hour and so we don't see the drift. However, we see the drift when the NTP call has failed repeatedly (which we have had happen to systems)

 

 

From: Loic De Buck <connect@industruino.com>
Sent: August 1, 2019 11:11 AM
To: Colin Ragush <cragush@islandwatertech.com>
Subject: Re: RTC & Drift

 

A new answer for RTC & Drift has been posted. Click here to access the post.

--
Industruino
Sent by Industruino using Odoo about Forum Post RTC & Drift

Colin Ragush
on 8/12/19, 11:49 AM

Hi Colin,

Could you please email us the details of your unit (serial number or batch code) ? There might be an issue with your unit so we can arrange a replacement. 

Thank you for reply.

Best Regards,

Loic

Loic De Buck
Loic De Buck
1263
| 3 1 3
Answered on 8/1/19, 2:11 PM
0
vote

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Asked: 7/25/19, 2:04 PM
Seen: 195 times
Last updated: 8/12/19, 11:51 AM