On-line Time-Base Calculator
This JavaScript works well with the newer version of Microsoft Internet Explorer (IE), but not with Netscape. Since all of our customers use IE, we will not expend any effort to debug this script for other browser versions. There's also information provided at the bottom of this page concerning an inexpensive WWV timepiece we recommend to check controller clocks that loose coordination with StreetWise.
The time is now , which is seconds after midnight (00:00:00).
Since midnight, complete second cycles plus seconds have elapsed.
The number of seconds in the current cycle is the counter in the Naztec controller
Tbc counter plus the controller offset is called the counter and is referenced to the the beginning or end of the coord phase.
The TBC and Loc counters for the current example (60" cycle / 0" offset) resets to zero on the even minute.
Go ahead and vary the offset and cycle length. Remember, the offset should always be less than the cycle length.
Setting the controller clock is the most important job of any ATMS system, because all controller reference their offsets from midnight as shown above. If a green band is 30" on a coordinated arterial and one of the controller clocks is 30" off from WWV, your progression will be lost until you correct the time synch in that controller.
The Naztec StreetWise communications server (com server) provides facilities to synchronize the system clock with the WWV time standard from either a GPS receiver, a telephone dial-up connection or over the internet. The user can schedule events to download the WWV time from the com server to all local intersection controllers once per month, once per week, once per day or once per second as desired.
When portions of your system are down because of communication problems, line breaks, etc, you can still maintain system progression by synchronizing the controller clocks in the field to WWV from the controller menu MM->4->1. This menu allows you to set the hour, minute and seconds separately. This allows you to enter the seconds forward in time and hit the "Enter" key when the true WWV seconds "come around". The controller can maintain an accurate WWV for weeks or months depending on the accuracy of the AC power grid (controllers count time using the 60 Hz power reference).
We recommend the following timepiece to synchronize clocks in the field. This unit automatically synchronizes to the WWV radio signal 6 times per day and is very accurate. Model 63-964 can be purchased from Radio Shack for approximately $30 US. and can be distributed to all of your maintenance personnel for a minimal cost.