| Electronics > Projects, Designs, and Technical Stuff |
| Using a fixed range AC voltmeter with variable input [SOLVED] |
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| enut11:
This pic shows the meter power mod and rear case. Counting screw terminals from the left: 1) Identified as "OP" is load return and connected to "N IN" via a 5mOhm shunt. 2) Identified as "IN" and marked also with an "N" is the neutral AC input. 3) Identified as "IN" and also marked with an "A" is the monitor AC input. This input will read down to zero vAC. 4) Identified as "OP" is load active and internally connected to (3). The brown wire is the meter electronics power lead. |
| enut11:
As this meter will be used with 240vAC, the final mod is to reduce voltage into the meter circuits by using an external series capacitor. The large internal (red) capacitor is 0.33uF so it makes sense to use the same value externally. Voltage rating of at least 200v is recommended. enut11 |
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