Maxim Integrated 71M6533-DB - Manual (Page 50)

71M6533- DB Demo Board User’s Manual
Page: 50 of 75 ` REV 3
Figure 2-13: Meter with Calibration System
Maxim’s Teridian Demo Boards are not calibrated prior to shipping. However, the Demo Board pulse outputs
are tested and compared to the expected pulse output rate. Figure 2-14 shows the screen on the controlling PC
for a typical Demo Board. The error numbers are given in percent. This means that for the measured Demo
Board, the sum of all errors resulting from tolerances of PCB components, CTs, and 71M6533 tolerances was
–
3.41%, a range that can easily be compensated by calibration.
Figure 2-15 shows a load-line obtained with a 6533 in differential mode. As can be seen, dynamic ranges of
10,000:1 for current can be achieved with good circuit design, layout, cabling, and, of course, good current
sensors.
Figure 2-14: Calibration System Screen
Calibrator
AC Voltage
Current CT
Meter
under
Test Optical Pickup
for Pulses
C
a
li
b
ra
te
d
O
u
tp
u
ts
Pu
ls
e
C
o
u
n
te
r
PC