Microchip Technology ARD00330 データシート
Meter Calibration
© 2011 Microchip Technology Inc.
DS51964A-page 51
2.7
METER SPECIFICATIONS AND CALIBRATION PARAMETERS
This section contains the editable options for the meter design.
The resolution of the output registers are determined from these three parameters, and
are set based on the information in Table 2-6
The resolution of the output registers are determined from these three parameters, and
are set based on the information in Table 2-6
These tables are important and are applied to calculate the resolution values used
when calculating the GAIN/LSb registers, that occur while calibrating the meter. These
values are also used to place the decimal point in the reading or results frame.
The resolutions shown in the below tables are based on the assumption that the I
when calculating the GAIN/LSb registers, that occur while calibrating the meter. These
values are also used to place the decimal point in the reading or results frame.
The resolutions shown in the below tables are based on the assumption that the I
MAX
and V
CAL
voltages will be at approximately 50% of the input voltage to the A/D
converters. To change the headroom of the A/D input, simply change the maximum
current number, and the GAIN/LSb registers will scale accordingly.
current number, and the GAIN/LSb registers will scale accordingly.
TABLE 2-6:
CURRENT RESOLUTION TABLE
TABLE 2-7:
POWER RESOLUTION TABLE
TABLE 2-8:
VOLTAGE RESOLUTION TABLE
Maximum Current Less than or Equal To
(A)
LSb Resolution (A)
8.1
0.001
81
0.01
810
0.1
8,100
1
Maximum Wattage Less than or Equal To
(W - I
MAX
times V
CAL
)
LSb Resolution (mW)
125
0.001
1,250
0.01
12,500
0.1
125,000
1
1,250,000
10
12,500,000
100
Maximum Voltage Less than or Equal To (V)
LSb Resolution (V)
ALL
0.1
Note: The decimal point location in the reading frame is updated whenever the
V
CAL
, I
CAL
or I
MAX
values are changed.