Cirrus Logic AN366 - Manual (Page 32)

AN366
32 AN366REV2
APPLY FULL-SCALE VOLTAGE TO SOURCE
(See Figure 24.)
Figure 24. Meter Test Equipment
See Non-full-scale Gain Calibration on page 9.
FULL LOAD AVAILABLE
PC/Controller knows if full load or partial load is available (see Figure 25 for partial load).
SDI = 0x92
0x7F 0x200000 Write Scale 0.25
SDO = 0xFF 0xFF 0xFFFFFF
SDI = 0x92 0x3F 0xFFFFFF Read Scale 0.25
SDO = 0xFF 0xFF 0x200000
Figure 25. Calibration Window
APPLY FULL-
SCALE (FS)
VOLTAGE
TO SOURCE
PF=1
FULL LOAD
AVAILABLE ?
APPLY
LOAD
SET SCALE
REGISTER
0.6  LOAD ÷ FS
4
5
YES
NO
PERFORM
PHASE
COMPENSATION
6