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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AS8267 датащи(PDF) 26 Page - ams AG |
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AS8267 датащи(HTML) 26 Page - ams AG |
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26 / 136 page  Data Sheet AS8267 / AS8268 Revision 1.0, 19-Jun-07 Page 26 of 136 ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ × = 768 , 32 185 , 67 027 , 73 round hex ) reg ( 1 i _ cal () () 31 . 617 , 35 round hex = = hex(35,617) = 8B21h Constant Voltage Register (vconst) The vconst registers (9334h and 9335h) provide a predefined voltage value that can be used for calculating energy when the Vmains is not available. The default value of vconst is 2877 (0B3Dh) which translates into an equivalent Vmains value of 311V. The energy is calculated using vconst and the selected current (i1 or i2) when sel_v in the SREG/Select register is set to ‘1’. The vconst value may be calculated according to the formula: π × × = 2 V _ RMS vconst Example: RMS_V = 479 ⇒ π × × = 2 479 vconst = 2,128 Note: When vconst is used for the calculation of energy, sel_p must be set to ‘0’. Low Pass Filter for Real Power (PLP) When the instantaneous power is low pass filtered the result is practically a DC value for the power, which is termed real power. It is generally preferred to use real power to generate pulses for the calibration, as the duration between pulses is more constant (pulse jitter). Corner frequency: 18.6Hz The low pass filter ensures that the power output pulse jitter is minimised. Direction Indicator (DIRO) The direction indicator (DIRO) situated in the Status Register (Bit 4) defines the direction of the measured power. The direction is determined by the phase relationship between the Mains voltage and selected Mains current (i1 or i2). When bit 4 in the Status Register is ‘0’, the Mains voltage and selected Mains current are in phase, thus indicating positive energy flow. When bit 4 in the Status Register is ‘1’, the Mains voltage and the selected Mains current have a phase reversal, indicating negative energy flow. The energy calculation (np) is generated (Once the voltage channel has been calibrated, 479 is the typical value when Vmains = 230V) |
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