MCP3909EV-MCU16 Microchip Technology, MCP3909EV-MCU16 Datasheet - Page 96
MCP3909EV-MCU16
Manufacturer Part Number
MCP3909EV-MCU16
Description
EVALUATION BOARD FOR MCP3909
Manufacturer
Microchip Technology
Datasheets
1.MCP3909T-ISS.pdf
(44 pages)
2.MCP3909T-ISS.pdf
(104 pages)
3.MCP3909EV-MCU16.pdf
(38 pages)
Specifications of MCP3909EV-MCU16
Number Of Adc's
2
Number Of Bits
16
Sampling Rate (per Second)
15k
Data Interface
Serial
Inputs Per Adc
1 Differential
Input Range
±1 V
Voltage Supply Source
Analog and Digital
Operating Temperature
-40°C ~ 85°C
Utilized Ic / Part
MCP3909
Silicon Manufacturer
Microchip
Application Sub Type
ADC
Kit Application Type
Data Converter
Silicon Core Number
MCP3909
Kit Contents
Board
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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MCP3909 / dsPIC33F 3-Phase Energy Meter Reference Design
C.14 RELATIONSHIP BETWEEN ERROR AND CURRENT
DS51723A-page 96
For a given load and frequency, the absolute ratio error and angle error increase when
the primary current decreases from the rated value for un-compensated current trans-
former. The reason is that with the decrease of the secondary current, the magnetic
permeability µ of the iron core varies non-linearly, resulting in less reduction in the field
ampere turns.
Figure C-8 is a typical curve for load current and the phase lag of a CT. Generally,
phase lag of the output signal is great when the load current is small, and also
increases at a fast rate.
FIGURE C-8:
Current Load Versus CT Phase Lag.
Phase Lag
Current Load
© 2009 Microchip Technology Inc.
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