variable amperage reading
in 912 / 914 Technical Questions
11 years ago
I would appreciate any insight into this anyone can provide.
Over an average 10 second period my EMS Dynon 120 shows amperage varying from -2 to +7amps. why the variation? Voltage was steady at 13.2V. My airport A & P, admittedly not well versed in Rotas ( there are only two CTLS's in Hawaii ), and he doesn't know....
I initially tried pulling each circuit breaker, one by one, seeing if I could understand which device might be creating this. Same result.
Then, I turned everything off, and used a amp cramp on the battery wire and it indicated about 2.5 amps at idle, up to 4.5+/- at higher rpms, very steady.
So, this inferred the voltage regulator / alternator was working fine...?
Is this variability in amperage ( versus a relatively steady reading on the EMS Voltage ) a "normal" condition--for reasons not understood, or is there a bigger problem I need to track down and eliminate...???
Scott Church
808 989 5967
N992SA 2008 CTLS
Kona Hawaii ( flying all over water :O)
Over an average 10 second period my EMS Dynon 120 shows amperage varying from -2 to +7amps. why the variation? Voltage was steady at 13.2V. My airport A & P, admittedly not well versed in Rotas ( there are only two CTLS's in Hawaii ), and he doesn't know....
I initially tried pulling each circuit breaker, one by one, seeing if I could understand which device might be creating this. Same result.
Then, I turned everything off, and used a amp cramp on the battery wire and it indicated about 2.5 amps at idle, up to 4.5+/- at higher rpms, very steady.
So, this inferred the voltage regulator / alternator was working fine...?
Is this variability in amperage ( versus a relatively steady reading on the EMS Voltage ) a "normal" condition--for reasons not understood, or is there a bigger problem I need to track down and eliminate...???
Scott Church
808 989 5967
N992SA 2008 CTLS
Kona Hawaii ( flying all over water :O)
