ORIGINAL: Campgems
Not all transmitters can use the jack for a voltage check, or for cycling the battery. They have a diode in the +line which prevents a draw being placed on the jack. THere are hacks on some of the boards for jumpering out this diode so you can cycle the batery. I know that a lot of the Futaba transmitters have the diode. THe 9C series doesn't. Anyway, like said a few times before, most every transmitter has a voltage indicator or digital readout.
Don
ORIGINAL: bruce88123
ORIGINAL: Missileman
ORIGINAL: Platinum
I think that a 10 ohm resistor is to low, for the tx it will draw 1 amp. I myself put a 33 ohm resistor on both the red and black connector of the meter. The current is Voltage divided by the resistor.
I thought about his and almost posted wrongly because for some reason I am stuck on checking the receiver pack and you are reffering to the TX pack.
10 ohm would be about right for the receiver.
But when it comes to the transmitter, why? I have numerous transmitters several brand name and more cheap ones from cheap RTFs and every single one of them has some type of indicator built in that lets you know the batteries condition and since the indicators only work when the TX is on they are under load as well.
OK on to the question of using a regular voltmeter. You can and best results are with a load applied but why bother with getting a resister and wiring it up correctly when an expanded scale voltmeter works just fine and doesn't cost much.
Here is the one I have for $10
http://www3.towerhobbies.com/cgi-bin...?&I=LXNK81&P=7
And PLEASE note that it includes a TX battery connection too if you insist on having one.
I never said he had to test it while installed.
