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Old Dec 24, 2006, 01:08 AM
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galloping gimp's Avatar
Ohio, USA
Joined May 2002
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Servo Tester vs. TX/RX for Motor Testing

I've always done motor testing by using a transmitter and receiver to operate the ESC and run the motor.

Is there a downside to using one of those little servo testers instead of the TX and RX?

I've (finally) built a proper test stand (Dr Kiwi Mk III style) and it occurred to me that using a servo tester would sure make a nice, neat configuration.

Just curious.

- Jeff
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Old Dec 24, 2006, 03:45 AM
Good Better Best quest.
olmod's Avatar
Australia, VIC, Cranbourne East
Joined Apr 2004
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None that iv'e found Jeff, in fact i find it darned handy when setting up servo's in a new model as well ,just set it on 1.5ms plug in and hey presto your servo is centred.
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Old Dec 24, 2006, 05:44 AM
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United States, OH, New Franklin
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Ditto.

No downside that I'm aware of. Use this one all the time with my test stand. Has always worked perfectly. My only complaint is the "scrunchy" plastic jacket that his servo tester is wrapped in. Could be more durably cased to protect it from abusers such as myself.
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Old Dec 24, 2006, 10:04 AM
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New Stanton, Pa.
Joined Jan 2004
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Quote:
Originally Posted by trashbug
Ditto.

No downside that I'm aware of. Use this one all the time with my test stand. Has always worked perfectly. My only complaint is the "scrunchy" plastic jacket that his servo tester is wrapped in. Could be more durably cased to protect it from abusers such as myself.
I use a VEXA servo tester do a search under vexa and you will find there home page.

...Keith...
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Old Dec 24, 2006, 10:13 AM
kit
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I have both servo testers and use them for motor testing all the time. I like this servo tester better. It has a hard case and more features.

https://www.unitedhobbies.com/UNITED...idProduct=3874
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Old Dec 24, 2006, 11:13 AM
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galloping gimp's Avatar
Ohio, USA
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Thanks everyone.

I purchased the servo tester linked in my first post for USD5.80 at a Hobby Lobby sale. At that price, I couldn't afford NOT to have one.

- Jeff
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Old Dec 26, 2006, 03:34 AM
Senior Moment Member
SF Bay Area, CA
Joined Jul 2002
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I use the GWS servo tester (P/N GW/STII/RC):

It has a digital read-out that shows the exact pulse width which can be manually set to any value or automatically swept from limit to limit at whatever speed you chose, and has a built-in 4.8 - 6 volt power source (depends on whether one is using alkyline AA batteries or rechargables). One other thing it will do that I've not seen in other testers is the ability to show the actual pulse width a transmitter is sending. This is accomplished by plugging the tester into a receiver channel that you want to monitor. Then as you move the corresponding stick on the transmitter, you should see the pulse width change to follow the stick movement. Note: this is a great way to test your TX and RX channel by channel.

One other thing - one cannot accurately match a servo's center to a TX's center using just a servo tester. In theory, 1.5ms should cause the servo to move to it's center point, but if you measured the pulse width from a TX channel that is centered, it may or may not be at exactly 1.5ms. It will, at least, get you in the ballpark.
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Old Jun 04, 2007, 11:58 AM
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Italy
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A question for you guys.

What if I am going to use this one....?
As you see it is rated 5-6 input volts.
Is it going to burn if I use it with 2S or 3S Li-poly battery pack ?

Franky
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Old Jun 04, 2007, 01:16 PM
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galloping gimp's Avatar
Ohio, USA
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Quote:
Originally Posted by frankyfly
A question for you guys.

What if I am going to use this one....?
As you see it is rated 5-6 input volts.
Is it going to burn if I use it with 2S or 3S Li-poly battery pack ?

Franky
If you are using this on a thrust stand to test motors, just plug your ESC into one of the servo inputs and connect your 2S or 3S pack to the ESC.

- Jeff
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Old Jun 04, 2007, 01:46 PM
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Boulder, CO
Joined May 2002
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Not to praise our product (well, not only to ), but to point at another option: check out our new USB interface, which can also drive a servo or an ESC:
http://www.milehighwings.com/



You can either pre-record channel sequence and then play the throttle channel back, or you may create a script file, with throttle vs. time program:
http://milehighwings.com/manual_usb_v4.htm#tools-menu



Boris
MHW R&D
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Old Jun 04, 2007, 02:38 PM
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Italy
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Thank you Galloping,
I started this hobby reading your thread about the AND-NOW park flyer.
Great info.
Franky
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Old Jun 04, 2007, 03:21 PM
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Italy
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Just to be clear.
Is this the correct connection scheme ?

Franky
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Old Jun 04, 2007, 06:45 PM
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United States, OH, New Franklin
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Looks right to me. Keep in mind that most of the servo testors have a univeral connector. All this means is that you can plug it in with the connector reversed. Nothing bad will happen, just reverse the plug.

Good Luck.
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Old Jun 04, 2007, 11:42 PM
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birdofplay's Avatar
United States, IN, Indianapolis
Joined Dec 2005
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I didnt see the REAL BEST REASON for using a servo tester ...

You'll never forget to turn off your TX !!! :-)

You might forget to unplug the rx battery from the tester tho.
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Old Jun 05, 2007, 04:33 PM
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Quote:
Originally Posted by babblefish
I use the GWS servo tester (P/N GW/STII/RC):
Are you also tired to change AA batteries like me?
;-)
Regards,
Herbert
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