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Frequency Generator Android Apps

SG19

SG19

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I'm just venturing into audio repair and don't have a scope or some other key equipment I'm seeing used . saw someone use a frequency generator app on their phone to generate the specified frequency to adjust power out put meters , does anyone have an android app they would recommend for this purpose ?

Also considering a Hantek 6022BE to use with a laptop , just a hobbyist at this point so investing in a lot of equipment isn't where I'm at at this point. I have a couple multi-meters but will likely modernize to one that can measure capacitance as none of mine do.

Hantek6002BE Series| Qingdao Hantek Electronic Co., Ltd. |Oscilloscope | Digital oscilloscope | Waveform generator | Multimeter | DC power supply | Data acquisition system | Spectrum analyzer

Hantek6002BE Series
hantek.com
 
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I don't know of an android app to use for a sig gen.

For DSOs, BW is a function of sample rate (sample rate/10). Sample rate is a function of the sweep setting and the amount of memory available to store the waveform. The amount of memory available is a function of the physically installed memory and the number of scope channels in use. Using more than one channel or using long sweep time decreases sample rate, so decreases BW. The BW spec is the best the scope can do, using one channel and relatively short sweep time.

Take a look at eevblog for discussion about using that scope for audio.

Measuring capacitance isn't terribly useful. When film caps fail, they short. Ceramic and mica caps don't usually fail, and would probably fail shorted. The only caps where you might see some variance are electrolytics and tantalum, but if they are more than 15-20 years old, don't bother measuring them- just replace them. A capacitance meter might be useful for checking the replacement caps before you install them.
 
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i had the 6022be. it didn't like something when i was testing and it died. i got a replacement and realized that it took out a usb hub in my pc.

got a replacement and it did the same with the 2nd usb hub which basically made my mobo useless.

found out that there is no isolation between the scope and pc.

i returned it and bought an owon vds1022 and built another computer for the bench which was really sad because i loved that old core 2 quad q9650 :(

Owon VDS1022I USB PC Oscilloscope, MIT USB Isolation, 25 MHz: Amazon.com: Industrial & Scientific

Owon VDS1022I USB PC Oscilloscope, MIT USB Isolation, 25 MHz: Amazon.com: Industrial & Scientific
www.amazon.com


and had no problems while i used it.
 
painttoad said:
i had the 6022be. it didn't like something when i was testing and it died. i got a replacement and realized that it took out a usb hub in my pc.

got a replacement and it did the same with the 2nd usb hub which basically made my mobo useless.

found out that there is no isolation between the scope and pc.

i returned it and bought an owon vds1022 and built another computer for the bench which was really sad because i loved that old core 2 quad q9650 :(

Owon VDS1022I USB PC Oscilloscope, MIT USB Isolation, 25 MHz: Amazon.com: Industrial & Scientific

Owon VDS1022I USB PC Oscilloscope, MIT USB Isolation, 25 MHz: Amazon.com: Industrial & Scientific
www.amazon.com


and had no problems while i used it.
Click to expand...
Glad I didn't pick one up in that case , thanks for the heads up.
 
SG19 said:
I'm just venturing into audio repair and don't have a scope or some other key equipment I'm seeing used . saw someone use a frequency generator app on their phone to generate the specified frequency to adjust power out put meters , does anyone have an android app they would recommend for this purpose ?

Also considering a Hantek 6022BE to use with a laptop , just a hobbyist at this point so investing in a lot of equipment isn't where I'm at at this point. I have a couple multi-meters but will likely modernize to one that can measure capacitance as none of mine do.

Hantek6002BE Series| Qingdao Hantek Electronic Co., Ltd. |Oscilloscope | Digital oscilloscope | Waveform generator | Multimeter | DC power supply | Data acquisition system | Spectrum analyzer

Hantek6002BE Series
hantek.com
Click to expand...
A test CD with a good CD player would generate purer, more accurate test signals. A good disc for this would be the Denon Technical Audio Test CD.
 
AudioTool by jjbrunn (Play Store). Then get you an iMM-6 microphone from Daytonaudio, good for evaluating loudspeakers in rooms, even cars.
 
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