How to use HJ Digital Servo motor and ESC tester

This video shows you how to use HJ Digital servo tester to test servo, ESC and check PWM threshold of brushless motor with different ESC
** Buy Servo Motor from **
Amazon USA: amzn.to/3m6Cmkr
Amazon Canada: amzn.to/2JdM5GK
All Europe Amazon: amzn.to/36YDSzn
AliExpress (single servo): s.click.aliexpress.com/e/_ApIWoQ
AliExpress (4/5/20pcs metal gear): s.click.aliexpress.com/e/_AFMrG
****Purchase HJ Servo tester **
From Amazon USA: amzn.to/3mv2xQU
from Amazon Canada: amzn.to/3r6rndt
** Purchase 30A ESC **
From Amazon USA: amzn.to/34mwYTs
from Amazon Canada: amzn.to/38fuaIG
Jump to different chapters of this video:
00:00 Start
01:00 Introduction
02:10 Settings explained
03:47 Modes
04:49 Connecting servo Small SG90 Servo
06:24 Testing Metal Gear servo
08:01 Connecting a brushless motor with ESC
09:46 Test of different ESC
11:20 Connecting ESC that does not have 5V power
Download resources for this video: robojax.com/L/?id=294
Tutorial by Ahmad Shamshiri form Canada
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#robojax #robojaxServoTester

[@michaeltyborski4802]

Thank you for an excellent guide to the HJ servo tester. After misconnecting a servo on another project, it burned out and became erratic. I did not enjoy the prospect of destroying another one. You prevented that problem. Thanks for your videos and Udemy courses.

[@robojax]

You are welcome. My pleasure.

[@dennisstaab1332]

Zz😂b😮Xiv9 6😅😅🎉😮😢

[@user-otzlixr]

That shouldnt be possible. Can anyone suggest a product that doesnt allow that to happen, No instructions come with this crappy product, yet you can short out stuff? Lets expect more...

[@GaryMcKinnonUFO]

You do well in the search results Ahmad, almost everything electronic i look up you are at or near the top! I forgot i had one of these from brushless motor tests years ago, testing servos with it now, thanks again.

[@robojax]

I haven't check it but thanks for letting me know. Good luck with the est. You are welcome.

[@OldCaliboy]

Yes. That was super helpful so I wouldn't plug the servo wires in backwards. Plus I learned a few things I didnt know it could do. Thanks.

[@robojax]

You are welcome.

[@IronBalls007]

Well this is a very well explained and detailed video on how to use a servotester, I have a different one but it works exactly the same and your information is on point. Thanks for this very valuable video. Liked and subscribed :)

[@upperechelon3456]

Great video. Thanks

[@robojax]

You are welcome.

[@fonrcscaleconstruction2255]

I like it very much. And will follow you forever 👍👍👍👍

[@robojax]

thank you very much.

[@wattage2007]

Helpful video, thanks!

[@sotm6078]

How do you set it to test digital servos vs analog servos?

[@REPORODGE]

Good video very informative and clear thanks

[@para09]

How do you set it to test digital servos

[@robert574]

I just bought my first servos and got one of those small blue square testers. The servos go 360 deg around twice when you turn it on and then stop. They will go to center but only move maybe 120 deg total. Then I bought one of these testers that I like a lot better. The servos don't go around in circles anymore but the movement is the same around 120 deg. They were MG90S and advertised to have all metal gears which they didn't. They refunded my money and I've ordered some more. Just getting started but I want what I paid for.

[@robojax]

Yes and here is the review of 3 Channel Servo tester with plastic case and aluminum case kzbin.info/www/bejne/inuWip2kqLd4p8U

[@carpenterfamily6198]

8:00 Motor / ESC test

[@deepakcoolm]

May I know what is pulsewidth button and how to use it.. it show me 50, 125 and 250 when I press..

[@RichardTapp1]

It surprised me that your ESCs started the motor at 1500 micro seconds - which is the mid throttle stick position. Mine all start at 1000 microseconds. Are yours set up for cars, with braking on the first half of the stick travel?

[@abcabc-ro4bc]

Any way to change the upper and lower limits, you can see from 6:00 that the servos never do a full 180

[@RichardTapp1]

They are not supposed to do a full 180 degrees. Nominally they are +/- 45 degrees for 90 degrees total. However that would be for the standard signal range of 1000-2000. This unit has extended range of 800-2200 so the servo travel is more than the standard 90 degrees.

[@MaskedCrypto]

Hey what Battery did you use with the Tester?

[@robojax]

I forgot what I used but this needs 5V and doesn't' matter you get it from.

[@dnafpv]

Can I use this to adjust the center point of a servo? I added rear steering to my rc truck but my radio doesn’t have trim for that channel and my wheels aren’t centered?

[@robojax]

no you can't . The center point is already set inside servo. You can just move it but not set.

[@dnafpv]

Thank you

[@robojax]

you are welcome.

[@RynaxAlien]

saw it for sale in clothing store. What it is useful for?

[@cryptout]

Got one for 11,99e very nice..

[@robojax]

very cheap. good luck.

[@dragonmodel9262]

Hi do you know how to tell what Hz ,milliseconds for the digital servo? I wouldn't want to damage it ,I didn't know it could be damaged thank you good information.

[@robojax]

a proper manufacturer should provide the servo motor required signal specs.

[@dragonmodel9262]

@@robojax thank you very much..I will try to find the information..ty

[@dragonmodel9262]

@@robojax please can I ask one more question?was just about the esc when powering the esc and motor do you use the battery that the esc needs?or a smaller one for this..thank you.

[@robojax]

Electronic speed controller ESC gets the pier and delivers it to ESC.

[@dragonmodel9262]

@@robojax I really appreciate the information,thank you for the help. I just got this with some esc's and servos for a few planes this helps thank you..

[@Yoyo-ug7wt]

I have the servo connected to an ESC powered by a 12V battery. The ESC is connected to a 3600KV motor. The lowest rpm I can get is about 15000 rpm when the setting is at 1500. When I increase that number to 2200 the rpm goes well over 24000 rpm. What is that number doing? What is it changing? The current? The voltage? I know it is pulse width in microseconds but I am a bit confused as nowhere it is explained what that number is in terms of how it affects the rpm.

[@robojax]

it is the pulse width. For the RPM you need to find your motor datasheet to see chart for voltage and PWM relationship to speed (RPM).

[@Yoyo-ug7wt]

@@robojax Thanks so much for your reply. It's the Surpass Hobby 2838 3600KV motor and no such information is provided. At 2200 the rpm is actually 46,500 (not what I listed).At 1500 the formula V=RPM/KV translates into just over 4V at 1500 and almost 13V at 46,500. Is the voltage therefore changing as one increases the pulse width or is is staying the same but somehow the pulse width is affecting the rpm?I am trying to get only 5000 rpm with this servo and motor but it does not seem it is possiblle. Is that correct and that I need a lower KV motor? I appreciate your reply.

[@clemensdotson8645]

Can I wire a 9v battery or other standard battery into the input?

[@robojax]

No you can't . Input of HJ Servo meter is 5V. It will kill it.

[@clemensdotson8645]

@@robojax I just found an old airplane battery that works perfectly! Thank you.

[@MaskedCrypto]

bro what battery did you use I need one? @@clemensdotson8645

[@jupiterjs031]

There are three pins when connecting to power 5V. Which is + and which is -? The other one doesn't have to be connected, right?

[@robojax]

The middle is always 5v + Then you won’t make mistake. Try one side for -. Search my channel for esc or servo. I have tones of video

[@jupiterjs031]

@@robojax thanks

[@savroo]

What is this actually doing? I know Hall effect sensors work between 0.8 v to 4.2 volts approx, is the servo tester extending the range to 0 to 5 volts?

[@robojax]

No. The voltage is fixed. It is turned off and on called PWM . You may learn something from this video kzbin.info/www/bejne/bICchHmserVpeNU

[@markdonovan4]

does this test brushed and brushless esc's

[@robojax]

both. this outputs PWM which can be used to control brushed and brushless ESCs.

[@hydra7013]

Can I use servo tester to pump fuel to mini turbine engine ??

[@robojax]

yes if the motor is brushless with 3 wires.

[@hydra7013]

@@robojax Can you define one type of fuel pump with 3 wire pls. ??

[@miricinizikiki2484]

can i read of the output of control module servo signal ?

[@robojax]

It is available for you

[@istelk34]

Ne kadar amp yük çeker.?

[@robojax]

?

[@ItAintMeBabe99]

Why doesn’t the servo travel a full 180 degrees?

[@robojax]

if it doesn't then, the tester is not generating the right signal.

[@gregkienle3378]

Too many ads.

[@robojax]

I just checked it. It is shown every 3 minutes. For short clips this is standard. If video was 1 or 2 hours, then it would have been every 15 minuets or 20 .

[@gregkienle3378]

@@robojax I realize this is not your standard but it makes continuity of the discussion very difficult with all the interruptions. Great video though. The numerical calibrators are an invaluable tool especially working with the Taranis radio systems.

[@robojax]

You are welcome. I am glad you found it useful.