Maxim Integrated 78M6610+LMU Evaluation Kit - Manual (Page 22)

78M6610+LMU Evaluation Kit User Manual
22 Rev 1
6.2 Pseudo-Isolated Single-Phase Measurements Using CTs
In this diagram, the two voltage inputs are used to measure a single 2-wire interface for a high-impedance
resistive isolation between AC and the 78M6610+LMU.
Connect
USB port
to PC
CT1
CT2
Load 1 Load 2
N
Line
N
Line
Line
Neutral
+
+
AC source
Figure 3: 78M6610+LMU Evaluation Board Connections
1. Connect the AC source Neutral to J4 and the load(s).
2. Connect the AC source Line to J2 and to J19 (Relay1) through the Line 1 CT.
3. Connect J20 (Relay1) to Line 1 load.
4. Connect Line 1 CT’s secondary to J14 (burden resistor).
If measuring a second load:
5. Connect the AC source Line to J31 (Relay2) through the Line 2 CT.
6. Connect J30 (Relay1) to Line 1 load.
7. Connect Line 2 CT’s secondary to J10 (burden resistor).