Experimental Physics and
Industrial Control System

gjzhai--- via Tech-talk <tech-talk at aps.anl.gov> · Fri, 18 Mar 2022 10:01:48 +0800 (GMT+08:00)

The R&S®SMB100A microwave signal generator outputs 1Hz pulses to the EVG. I select the source of event 125 from front panel input 0.

epics> dbpf("TST{evg:1-TrigEvt:0}TrigSrc-Sel","Front0")
DBR_STRING:          "Front0" 
epics> dbpf("TST{evg:1}1ppsInp-Sel","1")
DBR_STRING:          "Front0" 
epics> dbpf("TST{evg:1}1ppsInp-MbbiDir_.TPRO","1")
DBR_UCHAR:          1         0x1                 

> -----原始邮件-----
> 发件人: "Michael Davidsaver" <mdavidsaver at gmail.com>
> 发送时间: 2022-03-09 15:05:05 (星期三)
> 收件人: gjzhai at mail.ustc.edu.cn
> 抄送: tech-talk at aps.anl.gov
> 主题: Re: Timestamp test questions on Linux
> 
> On 3/7/22 00:47, gjzhai--- via Tech-talk wrote:
> > Hello！
> > 
> > I installed mrfioc2 2.3.0 on MTCA platform. According to EVR Usage Guide, when I do the timestamp test, there are two problems：
> 
> Could you describe your setup in more detail?
> 
> Where does the 1Hz (aka. 1 pulse per second) signal to the EVG
> originate?  The same GPS receiver as the NTP server in question?
> 
> https://github.com/epics-modules/mrfioc2/blob/a8cb48d549b7aae13206cf2d168c6f1cfec2e1c4/evgMrmApp/Db/evgMrm.db#L93
> 
> > a. The system is configured with NTP, but the current time provider does not have NTP
> > 
> > [opi@localhost ~]$ ntpstat
> > synchronised to NTP server (202.38.64.7) at stratum 3
> >     time correct to within 11 ms
> >     polling server every 512 s
> > 
> > b. The time interval between the system clock and the EVR time is large.
> > 
> > epics> generalTimeReport(2) Backwards time errors prevented 446106 times. Current Time Providers: "EVR", priority = 50 Current Time is 2022-03-07 16:34:25.575015. "OS Clock", priority = 999 Current Time is 2022-03-07 16:36:55.978638. Event Time Providers: "EVR", priority = 50
> > 
> > 
> > Thank you for your time. I am looking forward to your reply.
> 

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System