Setting The Real Time Clock; Real Time Clock Power Source - Siemens MD-12HD User Manual

Setting the Real Time Clock

The MD-xxHD meter includes a Real Time Clock. The clock is used only to time stamp Interval Data in
the log, it is not used for calculation within the meter. For those customers using the IDR function of the
meter, it is helpful (but not strictly necessary) to set the real time clock so that data records can be
uniquely identified. The time can be set using ViewPoint HD, under the Advanced Tab, by clicking on the
small time icon in the bottom right corner of the clock.
The clock icon launches the Window Calendar and allows the user to enter any desired date and time.
Set Time to Now populates the current time. Press the OK button to commit this time to the RTC chip
onboard the meter.

Real Time Clock Power Source

The RTC integrated circuit is a stand alone low power circuit within the MD-xxHD meter. Time is kept in
the absence of a connected external power source (AC or USB power) by a super capacitor. The
capacitor can keep the RTC running over normal power outages (days to weeks) but is not expected to
keep time while the meter is being stored or shipped.
Users desiring to use the Interval Data Recording capability of the MD-xxHD meter will want to
have a procedure that ensures the Real Time Clock is set as part of the commissioning process.
29 Siemens Industry, Inc.