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PDF ATT7021B Data sheet ( Hoja de datos )
| Número de pieza | ATT7021B | |
| Descripción | User Manual | |
| Fabricantes | Hi-Trend Technology | |
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ATT7021B User Manual（210-SD-123）
ATT7021B User Manual
2009-5 V1.0
－ATT7021B update ATT7021
－ATT7021 User Manual
http://www.hitrendtech.com
版权归钜泉光电科技（上海）有限公司所有
Page1 of 14
Rev1.0
1 page  
ATT7021B User Manual（210-SD-123）
Annex 2: Test data of typical customer meter:
Current in positive direction
I
Imax
Imax
Imax
100%
100%
100%
50%
50%
50%
20%
20%
10%
10%
10%
5%
5%
PF
1.0
0.5L
0.8C
1.0
0.5L
0.8C
1.0
0.5L
0.8C
0.5L
0.8C
1.0
0.5L
0.8C
1.0
0.5L
1#
-0.006
-0.012
-0.012
0.002
0.005
-0.012
0
0.007
0.01
0.029
0.005
0.034
0.09
0.04
0.066
0.166
2#
-0.023
0.000
-0.035
-0.022
0.021
-0.037
-0.01
0.028
-0.031
0.063
-0.033
0.021
0.091
0.024
0.064
0.157
IC: ATT7021B
3#
0.006
4#
-0.029
0.035
-0.012
0.00
-0.041
0.022
-0.039
0.058
-0.002
0.005
-0.044
0.028
-0.021
0.078
-0.003
0.024
-0.042
0.053
0.03
0.013
-0.008
0.038
-0.004
0.126
0.111
0.048
0.044
0.106
0.102
0.186
0.212
5#
0.012
0.07
-0.017
0.012
0.074
-0.024
0.007
0.088
-0.014
-0.099
0.016
0.064
0.181
0.045
0.093
0.281
6#
0.053
0.059
0.059
0.064
0.066
0.066
0.064
0.078
0.071
0.088
0.074
0.073
0.096
0.102
0.141
0.156
http://www.hitrendtech.com
版权归钜泉光电科技（上海）有限公司所有
Page5 of 14
Rev1.0
5 Page 
PERFORMANCE PARAMETER
ATT7021B User Manual（210-SD-123）
1) Frequency Outputs F1 and F2 The ATT7021’s output frequency or pulse rate is related to the input
voltage signals by the following equation
Frequency = F=(8.06×V1×V 2× G × F1−4 ) /V 2REF
2) Error as e N % of reading The ATT7021’s percentage error is defined as:
Frequency Error = Energy Re gistedByATT 7021− TrueEnergy ×100%
TrueEnergy
3) Start – up Current and No load Threshold The ATT7021 also includes a Start-up Current and No
load threshold feature that will eliminate any creep effects in the meter. The ATT7021 is designed to
issue a minimum output frequency on all modes except when SCF = 0 and S1 = S0 = 1. The no-load
detection threshold is disabled on this output mode to accommodate specialized application of the
ATT7021. Any load generating a frequency lower than this minimum frequency will not cause a pulse to
be issued on F1, F2 or CF. The minimum output frequency is given as 0.0014% of the full-scale output
frequency for each of the F1–4 frequency selections. A start-up current 10 mA at 220 V and PF=1.
APPLICATION NOTES:
Table I
F1 and F2 Frequency at 100imp/kWhr
Table II
S1 , S0
SCF VS CF Frequency ( full input )
Note : 1) User can select the frequency of F1 according to the table.
2) The CF logic output gives instantaneous real power information. The output is intended to be
used for calibration purpose, or interfacing to an MCU.
3) Performance Parameter Sections The Equation where:
Freq = Output frequency on F1 and F2 (Hz)
V1 = Differential rms voltage signal on Channel 1 (volts)
V2 = Differential rms voltage signal on Channel 2 (volts)
Gain = 1, 2, 8 or 16, depending on the PGA gain selection made using logic inputs G0
and G1
VREF = The reference voltage (2.5 V ± 8%) (volts)
F1 - 4 = One of four possible frequencies selected by using the logic inputs S0 and S1 see
Table II
Typical Application Circuit
http://www.hitrendtech.com
版权归钜泉光电科技（上海）有限公司所有
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Rev1.0
11 Page | ||
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| PDF Descargar | [ Datasheet ATT7021B.PDF ] | |
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