ION 8650 IRIG-B clock source

[Liangchen1982]

Hello,

I have many ION 8650s with IRIG-B time synchronize connection, and have a question regarding the CL1 Clock Source: I know it should be set to "COMM". however, I have many sites and they are set to "internal" or "line frequency", and they all work well. see below:

 

I am wondering do I need to modify it to "COMM"?  Is there any potential risk to leave it as "internal" and "line frequency"? 

Thanks 

Leo 

[Liangchen1982]

I am wondering do I need to modify it to "COMM"?  Is there any potential risk to leave it as "internal" and "line frequency"? 

Thanks 

Leo 

[Charles_Murison]

Hello @Liangchen1982 ,

I am not able to see the images but to answer your question. The official configuration that is tested and supported is to change the Clock Source to comm.

Regards,

Charles

[Yut]

In Thailand we use INTERNAL clock source with IRIG-B for ION8800.

We let the internal run if the internal clock shift from IRIG-B time value time change will occur to adjust the clock to IRIG-B. This is what I learned from ION meter long ago since the ION8400. 

[Liangchen1982]

Thanks Yut, 

Officially should use COMM for IRIG-B. 

Actually we use both internal and line frequency, and they are working fine.  Not sure if there is any potential risk with these configurations. 

[Yut]

We are using INTERNAL clock source for more than 10 years it work well at least if the signal loss the internal clock still running. Some meter running the clock with external source when loss occurred the meter lost measurement.

There are many things good in ION meter the customer appreciate very much.

[DanL · Accepted solution]

The ION8650 "Internal" clock source is a very stable temperature controlled oscillator and as such will provide reasonable performance, but in the long run not as good as using COMM with IRIG-B.
The only expected symptom should be an occasional extra time adjustment once the two clocks have drifted far enough apart.

Using "Line Frequency" with any periodic external clock adjustments is much more problematic and never recommended with IRIG-B