71M6521 Demo Board User’s Manual
Revision 2.18
© 2005-2009 TERIDIAN Semiconductor Corporation
Page: 31 of 111
Important safety precautions apply when operating the Demo Board in shunt mode:
In shunt configuration, the whole Demo Board will be at line voltage! Touching the board or any
components must be avoided!
It is highly recommended to isolate Demo Board and Debug Board (when used) and to provide
separate power supplies for the Demo Board and Debug Board.
Emulators or other test equipment should never
Only
be connected to a live meter without proper
isolation! USB isolators are available from various vendors.
one
shunt resistor can be used in a meter, since isolation cannot be maintained when using
more than one shunt resistor.
1.8.5 CONNECTING DEMO BOARD REVISIONS D6521T4A7, D6521T4A8, AND
D6521T4A10 TO A SHUNT RESISTOR
The Demo Kits containing the Demo Board Revisions D6521T4A7, D6521T4A8, and D6521T4A10 are
shipped with a pre-wired shunt resistor (400µ
Ω
), as shown in Figure 1-7. This shunt resistor is connected to
the Demo Boards, as shown in Figure 1-9.
Figure 1-9: Shunt Connection for D6521T4A7, D6521T4A8, and D6521T4A10
LIVE
NEUTRAL
SHUNT
LOAD
2.5MOhm
750
Ohm
Power
Supply
D6521T4A8 Demo Board
Low crosstalk demands
that these current paths
not share a common
w ire.
J4
Voltage
Divider
V A
V3P3A
GND
IA
71M6521
R15-R18
R32
V3P3
J3 or J16
C9
These wires must be
connected directly at
the shunt resistor
C6
J9
NEUTRAL
LIVE
1
3
REFA
WHITE
BLUE
RED
1000pF
VB
R6
R7
10/8/2007
2
L9 (NC)
L12 (NC)
R88
Power supply and
reference for voltage
measurement
Reference for
current
measurement
Signal for
current
measurement