Part Number:MSP-EM-DESIGN-CENTER
Tool/software: Code Composer Studio
Hi,
We use EVM430-i2040S with EMDC to test its measurement accuracy, and the results are as follows.
We observe there are inaccurate current, power, PF in lower PF (ex: PF = -0.7 [CF=2.5], PF = 0.5 [CF=3.5]).
We also try to change sample frequency to 8K or 16K in EMDC, and the result are similar as the default 4K sample frequency.
Could anyone please solve this problem ?
Thanks.
| test condition | EVM430-i2040S | meter:CP268 | error | ||||||||||||
| freq | V | I | PF | V | I | W | PF | V | I | W | PF | V err | I err | W err | PF err |
| 50 | 220 | 2 | 1 | 220.486 | 1.991412 | 436.845148 | 0.9959 | 220.6882 | 1.99146 | 436.4825 | 0.993153 | -0.09% | 0.00% | 0.08% | 0.28% |
| 50 | 220 | 2 | -0.7(CF=2.5) | 220.509 | 1.946683 | 289.958774 | 0.9887 | 220.769 | 1.969176 | 290.3304 | 0.6678361 | -0.12% | -1.14% | -0.13% | 48.05% |
| 50 | 220 | 2 | 0.5(CF=3.5) | 220.486 | 1.873552 | 207.367171 | 0.9901 | 220.7694 | 1.947448 | 205.0663 | 0.4769683 | -0.13% | -3.79% | 1.12% | 107.58% |
Environment:
1. Use the default EVM430-i2040S_1V_1C_50Hz config in EDMC to generate CCS codes
2. The EVM is EVM430-i2040S, but MSP430i2041 is replaced by MSP430i2040
3. The source is CIF-1030EP, the loader is PG32612, and the meter is CP-268
4. The error value is got by ( test value - meter value) / meter value / 100