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I was wondering how do the timegrapher phone app's out there compare to a dedicated bench top machine. I'm guessing it's all down to the piezoelectric pickup? I installed tickoprint on my phone the other day. But to get the full features you need to shell out $30, if you then also have to shell out for a piezoelectric mic, then you are almost at the same price point as a cheap chinese bench top machine!

 

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I can't even work out how to use them, the ones i've tried are so arcane. used a bench top one that's easy enough for a child to use. I'd like to figure it out. I think wildspectra was the main one i tried. 

Edited by Ishima

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It's far from perfect, but after my first reply I downlaoded a bunch off of google play and started testing them, one that worked for me was 'hairspring' takes a minute to 'synchronise' before it can give you a reading and its only precise to the minute on the amount of gain/loss, but it is quite simple and like i said, it worked.

Edited by Ishima

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I've not had any great success with any of the mobile apps.  It's much better to build a preamp based on instructions found on the Watch-o-scope web site and run that program on a PC.

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I have tried a few on my iPhone & they work Ok the biggest issue is getting a good pick up. The best I found was the ear piece supplied with the phone. Also if I remember correctly they do not show beat error only how much it is gaining or losing. There are a couple of apps one is "clockmaster" 

 

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A few weeks ago I tested some Iphone apps. It is surely tempting to use a smartphone as timing machine.

For testing I used watches of course, but mainly my generator for synthetic tick noise, which I had built to test my own windows timing machine app PCTM. Pickup was a piezo mic with internal preamp, but also the generator signal directly.

(Bottom: Rate, amplitude, escapement error and signal level are exactly adjustable)

To make a long story short, result was worse than expected. Particularly amplitude detecting - if implemented at all - was sucessful sporadic at best. Some apps displayed wrong values, the user had no chance to recognize this. 
Common to all apps is a waiting time beyond all bearing for the first measurement result.

It seems all developers emphasize on nice design and on marketing, but make little effort to securely evaluate the tick noise (which is the real challenge). For professional (i.e. quick and reliable) measurements these smartphone apps are not (yet?) adequate.

Frank

SyTic.jpg

SyTic1.jpg

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The Watch Tuner Time Grapher gives Rate in seconds/day, Beat Error and Amplitude. It also graphs the sounds so you can see Beat Error and whether or not it is running fast or slow at a glance. If the watch is magnetized you can tell this at a glance as well because of the haphazard pattern.

It's a green app with a white dial. I can't remember what it cost.

Dave

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A present I have nothing to evaluate the accuracy of a watch either before or after working on it. I therefore think as an amateur (beginner) that £15 on an app is a bargain. On the other hand, there are some good Chinese dedicated timegraphers for £160. Buy cheap buy twice I wonder?p


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