I have an HXr and the voltage has always read low.
I removed the display and made a new harness to test all 3 inputs with a battery.
The voltage read with a Fluke meter was 12.6 but the HXr showed 12.2 on all three inputs
This seem like a lot of error, Is this normal?
Thanks
-Rob
Low Voltage
Re: Low Voltage
No.
Sounds normal to me.
The units have diodes (and probably other stuff) inside to make it possible for them to be feed from multiple power sources.
A .4 volt drop across a diode is not out of the ordinary.
Press on!
James
Sounds normal to me.
The units have diodes (and probably other stuff) inside to make it possible for them to be feed from multiple power sources.
A .4 volt drop across a diode is not out of the ordinary.
Press on!
James
Re: Low Voltage
I disagree, mine reads correctly. It should be no worse tham 0.1 volts error.
Before calling GRT check all power AND ground connections.
Before calling GRT check all power AND ground connections.
Re: Low Voltage
A question of clarification ...
Bob,
Are you saying that you are seeing only .1 volt difference in the EFIS V1, V2,V3 and actual battery voltage????
I need to go back and check mine as I *think* that mine has always been a lot bigger difference.
Not disputing. Just checking to verify.
Thanks!
James
Bob,
Are you saying that you are seeing only .1 volt difference in the EFIS V1, V2,V3 and actual battery voltage????
I need to go back and check mine as I *think* that mine has always been a lot bigger difference.
Not disputing. Just checking to verify.
Thanks!
James
Re: Low Voltage
I have found the same thing with my HX system. The voltage measured by any of the EFIS inputs is always .3-.4V lower than what the EIS reads. The EIS happens to agree with what my DVM shows at the fuse block, so that's the one I pay attention to.
-John Basol
-John Basol
Re: Low Voltage
Curious. I have an Hx, EIS, and other brand D6. The Hx is on the avionics buss, the other two are not. All three agree within 0.1 volts if I turn off all other avionics. If I turn on the usual avionics I see that buss drop 0.1 or 0.2 volts. I figure it's a small resistance across the CB.
Re: Low Voltage
If you have a long harness and the HXr screen is at full brightness, you will see a voltage drop just because of the current through the wires. The backlight uses a lot of power. The voltage drop will decrease when you reduce the brightness of the screen.