RunRyder RC
WATCH
 1 page 582 views POST REPLY
HomeRC & Power✈️Aircraft🚁HelicopterRadio - Servo - Gyro - Gov - Batt › Measuring current draw - MA Fury 55
07-28-2013 09:25 PM  6 years ago
Topic Vote0Post 1
raybans

rrApprentice

Northern Ireland

MyPosts All Forum Topic
Measuring current draw - MA Fury 55
Guys,

I started the heli up for the first time in a few months.

I use a Hyperion 3800mah 2s pack and had been stored at 3.3 volts. When i charged the batt up for this flight i remarked on the differential between the two cells ... 3.54 vs 3.6. Not sure if that is within normal ranges but it struck me as unusual.

Just took my time and did a gentle hover to slowly get confidence levels up.

It was all a bit twitchy and for some reason i decided to land and re-charge the battery just to make sure all looked ok.

I was shocked because it took 800 mah to replenish. I had been hovering for no more than 4 minutes.

So something is not right. The cyclic servos were also a little warm which is unusual in my experience given the very low level of activity.

On board set up,

1. CGY750 with cyclic gains at 60 (v1.31)
2. Cyclic servos BLS255HV
3. Tail BLS256HV
4. Throttle 451 with Futaba voltage regulator PS-01 RS.
5. Telemetry - temp sensor, GPS sensor.
6. switch is the perfect regulator safe switch 2. Use 2 patches - one to Rx and one to CGY.
7. Switchglo pro.

When i checked it all on the bench there was no servo buzz or binding that i could see/hear.

It was suggested i set up on the bench and do some current draw tests. Thing is I am not sure how to do this!

I've got a fluke 115 multi-meter. Its DC current range is from 6.0A and has a resolution of 0.001A. Does this have the spec to do my job? My battery is only 3,8A so i don't know how a lower threshold of 6.0A in the meter is going to cut it?

Just make a deans y lead and hook it up with croc clips and start moving the tx sticks? Am i on the right track? Then start unpluging things gradually to see if i can find the culprit.

Bit of a novice on electronic trouble-shooting!

thanks,

R.
"Not everything that can be counted counts, and not everything that counts can be counted"
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
08-02-2013 06:49 PM  6 years ago
RCHSF

rrKey Veteran

NC

MyPosts All Forum Topic
Sounds like your on the right track. I'm not fmailar with the fluke, and testing amp draws. I got a Watt's up meter. Very easy to use. For all your running I'd go with at least a 2S 3000+ mah pack. You should pop off the links one ball at a time. And hold the link out horizontal, may have to tilt model. If they stay flat and dont swing back with a slight shake they are to tight. Several like this will draw a pack down and heat up everything related.
SHARE  PM  EMAIL  Attn:RR  Quote
08-03-2013 08:31 PM  6 years ago
raybans

rrApprentice

Northern Ireland

MyPosts All Forum Topic
Thanks.
Amp fuse in multimeter gone so awaiting fluke sending me a replacement.

Found a great YouTube instruction video at,

http://m.youtube.com/watch?v=EVFkKBFJsZg

Appreciate your help. Will report back on any interesting findings.
"Not everything that can be counted counts, and not everything that counts can be counted"
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
08-11-2013 07:59 PM  6 years ago
Andy from Sandy

rrElite Veteran

Bedfordshire, UK

MyPosts All Forum Topic
I haven't watched the video but in order to measure current using the meter you need to open the circuit and then complete it again with the meter. So you would for example cut the positive wire from the battery to the receiver and then connect the positive wire of the meter to the battery and the negative lead of the meter to the rx to complete the circuit.

I don't know that meter but I do use one of the more expensive Flukes. If it has it you need to enable max hold and then wiggling the sticks you will get to see the maximum draw from your setup.
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 1 page 582 views POST REPLY
HomeRC & Power✈️Aircraft🚁HelicopterRadio - Servo - Gyro - Gov - Batt › Measuring current draw - MA Fury 55
 Print TOPIC  Make Suggestion 

 2  Topic Subscribe

Sunday, August 18 - 11:48 am - Copyright © 2000-2019 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online