Timegrapher microphone not parallel in “dial-down” position

[Bill2024]

Is this something I should worry about?  I have a new timegrapher (Weishi 1900) and when the microphone is turned to the down facing position it does not lock parallel and so may not give a true positional reading.

Is this something hing that can be easily corrected or should I return it?

Thanks, Bill

[AndyGSi]

Do you know that it is a Weishi 1900 or is it a copy?

[Bill2024]

2 hours ago, AndyGSi said:

Do you know that it is a Weishi 1900 or is it a copy?

As far as I know it is by Weishi. Got it from Amazon so I suppose can’t be 100% sure of the origin. 

[GPrideaux]

Based on the photo it's out by 2.4 degrees. I'm no expert but I'd be surprised if that made a measurable difference to your measurements. In any case, you can check easily enough: measure the same watch dial up with the mic in the position photographed,  then turn the mic over, and the watch over, and measure dial up again. Or adjust it with a spirit level and do before and after measurements. I'm sure others here would be interested in the results of the experiment, and if it really does make no measurable difference then you save yourself the hassle of returning and replacing it.

[Bill2024]

5 hours ago, GPrideaux said:

Based on the photo it's out by 2.4 degrees. I'm no expert but I'd be surprised if that made a measurable difference to your measurements. In any case, you can check easily enough: measure the same watch dial up with the mic in the position photographed,  then turn the mic over, and the watch over, and measure dial up again. Or adjust it with a spirit level and do before and after measurements. I'm sure others here would be interested in the results of the experiment, and if it really does make no measurable difference then you save yourself the hassle of returning and replacing it.

That’s a great idea. I tried it using a watch I put together using an st3620 movement as from the factory - I haven’t got my hands on this on yet!

The main differences I see between true level and the position that the microphone locks into is:

* true level has a lower beat error - approx 0.2ms difference. 

* true level gains about 8-10s per day whereas out of level gains around 9-11s per day

* amplitude seems pretty much the same

There definitely seems to be a slight difference and I know it’s going to bug me!  Are all the microphones for this timegrapher like that or do I just have one that’s out of alignment?