User's Manual

ANSI Electric Meter v3.1 User’s Guide 83
Category Detail
Nominal voltage: Dependent on ANSI form and model
Form 2S: 240 VAC
Input voltage range: -20% to +15% of nominal voltage
Frequency: 60 Hz (+/- 5%)
Current: Dependent on ANSI form and model
Form 2S: CL200, TA 30A
Timing: Real-time clock accurate to +/- .5 seconds per day, battery-backed
Data logging intervals: User-selected at 5, 15, 30, 60 minutes, or 1 day
Verification output: 2 pulse-output LEDs representing kWh and kvarh. Signaling at 1 Wh per pulse
Data security: Password protection for optical communication. Authenticated and encrypted
password-protected transactions for power line communication.
Data storage: Non-volatile memory
Data communications: Power line carrier (PLC) using Echelon’s CENELEC A-Band compliant PLC
technology
Optical port: per ANSI C12.18
Communication error
detect:
CRC for optical communication, authentication and handshaking for PLC
communication
Life Expectancy The NES meter has been designed for a life expectancy of at least 20 years, at
annual average ambient temperatures less than or equal to 35°C and greater
than or equal to -40°C.
The predicted mean time between failures (MTBF) of the NES meter, based on
MIL-217F Notice 2, with realistic modifications at 25°C, is approximately 341
years (2,991,000 hours). These MIL calculations are very conservative. NES
meters have been designed such that the failure rate for 20 years at an annual
average ambient temperature of up to 25°C will not exceed 0.3% failures per
year.