hi guys,
would be interested in your thoughts on this.
we have a customer where the time keeps going out of sync (by several hours) on their khw electricity meter. the meter has a real time clock driven by a 32khz oscillator to facilitate different metering tariffs.
The meter has been replaced with an identical one, and within a few weeks the same issue is apparent (wrong time).
we have several thousand of these meters installed at other sites and never had this issue.
some form of meter tampering is suspected, but it is hard to see how this is happening as the unit is heavily sealed and these are all intact.
Onr possibility is that the frequency of the mains line supply is been altered by the customer to cause malfunction of the meter. possibly by hooking up a variable frequency motor drive to the incomming supply. could supplying the unit and presumably its onboard DC power supply witha frewuency much lower or higher than intended fool the onboard clock?
Appreciate any thoughts.
thanks guys.
mike
would be interested in your thoughts on this.
we have a customer where the time keeps going out of sync (by several hours) on their khw electricity meter. the meter has a real time clock driven by a 32khz oscillator to facilitate different metering tariffs.
The meter has been replaced with an identical one, and within a few weeks the same issue is apparent (wrong time).
we have several thousand of these meters installed at other sites and never had this issue.
some form of meter tampering is suspected, but it is hard to see how this is happening as the unit is heavily sealed and these are all intact.
Onr possibility is that the frequency of the mains line supply is been altered by the customer to cause malfunction of the meter. possibly by hooking up a variable frequency motor drive to the incomming supply. could supplying the unit and presumably its onboard DC power supply witha frewuency much lower or higher than intended fool the onboard clock?
Appreciate any thoughts.
thanks guys.
mike