Fun with a frequency analyzer : Part I
Since I started clubfitting I use an Auditor Frequency Analyzer. This model uses strain gauges to measure the frequency and is capable to show the cpm up to 1000 cpm on it's LCD display.
However this model also has something very nice, it has an RS-232 port and analog out!
Using the analog out would not only allow to measure cpm's higher then the 1000 cpm LCD limit but would also allow to measure shaft specifications like decay rate and amplitude. The ports are blanked out. Please note : By breaking the tabs you signify your intent to use the extra features as is and at your own risk!
So I broke out those tabs to get access to the analog out port, found a audio cable and contected the cable to the "Microphone in" port on my laptop. Wrote some software and this is what I found.
This is a True Temper Dynamic Gold X100 and I was using a 205.7grm tip weight. While I recorded the analog data I also used the Analyzer to give me the CPM's. These are the CPM's displayed on the LCD output:
391.13
391.90
392.15
392.92
394.99
The average according to the analyzer was 392.61cpm.
I then took the analog data (all 38 seconds), did not clean it but just tried to extract the T (period) values from it.
As you can see there is some serious spread in the values. In fact the average is 392.18cpm which is very close to the reading of the Analyzer itself but the standard deviation is 9.49cpm!
to be continued.....
However this model also has something very nice, it has an RS-232 port and analog out!
Using the analog out would not only allow to measure cpm's higher then the 1000 cpm LCD limit but would also allow to measure shaft specifications like decay rate and amplitude. The ports are blanked out. Please note : By breaking the tabs you signify your intent to use the extra features as is and at your own risk!
So I broke out those tabs to get access to the analog out port, found a audio cable and contected the cable to the "Microphone in" port on my laptop. Wrote some software and this is what I found.
This is a True Temper Dynamic Gold X100 and I was using a 205.7grm tip weight. While I recorded the analog data I also used the Analyzer to give me the CPM's. These are the CPM's displayed on the LCD output:
391.13
391.90
392.15
392.92
394.99
The average according to the analyzer was 392.61cpm.
I then took the analog data (all 38 seconds), did not clean it but just tried to extract the T (period) values from it.
As you can see there is some serious spread in the values. In fact the average is 392.18cpm which is very close to the reading of the Analyzer itself but the standard deviation is 9.49cpm!
to be continued.....