Home |
Search |
Today's Posts |
#11
posted to rec.boats.electronics
|
|||
|
|||
Zinc Fish, what is acceptable measured current ?
Chuck,
Here are two quick tests you can make: 1) Measure the voltage between the fish and the engine stud, noting the polarity. This may confirm that something is adding to the galvanic couple set up by the zinc and the prop. -- With the engine connected to the black wire, and the fish on the red wire, I got -127mV 2. Disconnect the battery positive terminal wire and see if your symptoms change. If you have a breaker at the battery, or a switch, or a fuse, then there is no need to remove the wire, as long as absolutely nothing is connected to the battery terminal. That includes bilge pumps, etc. Be careful working around the battery. -- No change, between the case of batteries disconnected and running minimal DC. Both had - 42 mA; However, when I increased the number of devices I had in use I saw a change to -21 mA. I realize these readings are different then yesterday, I used better equipment and measurement process (see other thread) -- You made an earlier point, summarized here, that you don't expect to see any potential if there are two zincs in close proximity both connected to boat ground (the prop and the fish). That makes a lot of sense to me, does that statement still make sense to you ? -- Please look at the new thread and comment Chuck |
Reply |
|
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Testing effectiveness of zincs | Boat Building | |||
SSB Antenna theory | Electronics | |||
Notes on short SSB antennas, for Larry | Cruising | |||
Notes on short SSB antennas, for Larry | Electronics | |||
The problem with these off-topic, political threads... | General |