User's Manual

US Smart Outlet Purchase Spec September 21, 2012
Doc: D10025-002 Tendril Confidential Page 5
3.3 Sub-metering Accuracy
The unit measures and reports Voltage, Current, Instantaneous Power, and Energy as described in
Section 2.1. Note that only Power and Energy are presently reported to TNOP. The accuracy is
specified as follows:
Current
RMS
Voltage
RMS
Instantaneous
Demand
Current Summation
Delivered
Low Normal
Range 0-1.7 A
RMS
1.7-15 A
RMS
100-150 V
RMS
0.1 -3.0 kW [0, 281 TWhr)
Average
Accuracy
+ 50 mA
RMS
+ 3% + 2% + 4% or + 6 W Same as Inst
Demand in %
The current shunt sense accuracy is stated as 3% or 50mA, whichever is higher. Similarly, Instantaneous
Demand accuracy is either 4% or 6W, whichever is larger. Finally, the same % error determined for
Instantaneous Demand carries forward into Current Summation Delivered.
Distortion of the voltage or current can adversely affect the accuracies declared above. Typically this is
not an issue for line powered devices without an SCR or other switching components.
Tendril does not have the equipment or procedure to calibrate units.
3.4 Radio
3.4.1 HAN Radio Specifications
The product conforms to the Zigbee (IEEE 802.15.4 RF) specification and utilizes the ZigBee Smart
Energy profile with additional Tendril functionality. The unit utilizes a fully tested and certified transceiver
module with the following specifications:
• Indoor Range: 300 ft
• Outdoor Line of Sight: 1000 ft
• Tx Power: +20dBm (100mW)
• Rx Sensitivity: -102 dBm
• RF Data Rate: 250 kbps
3.4.2 Channel Tx Power
In order to comply with US FCC Requirements as stated in OET Bulletin No 63, October 1993, the upper
channels are attenuated relative to other channels as follows:
Typical Tx Power
Level Power (dBm)
Channel 11 (2405 MHz) – Channel 23 (2465 MHz) 3 20
Channel 25 (2475 MHz) -3 14
Channel 26 (2480 MHz) -14 4