I am a car antenna manufacturer, and the antennas we produce are equipped with FM and AM active band amplifiers and GPS amplifiers, and after production, we test the antennas with the signal generator device and spectrum analyzer. Now I want to make a simple tester for each of the amplifiers so that they can be tested before assembly and we don't have to test them in the last step and don't need the generator signal and the analyzer spectrum. Please show me how to make a simple tester.

 

Please show all your threshold specs and interface

 

If you only test them before they are assembled together, you will not know if they have been installed correctly and are working!

 

If you want to test an amplifier, you will always need some kind of signal generator with a frequency and output voltage that fits to your amplifier's input. Maybe it is sufficient to have a power meter at the output to see whether the output level is OK or not. But since you are working with GPS signals which are above 1 GHz even this test setup is neither simple nor cheap.

 

If you only test them before they are assembled together, you will not know if they have been installed correctly and are working!

After assembly, we test with a signal generator and a spectrometer, but sometimes they break, so we have to redo the work. This is because I want to test inside the enclosure before final testing.

 

After assembly, we test with a signal generator and a spectrometer, but sometimes they break, so we have to redo the work. This is because I want to test inside the enclosure before final testing.

You will need to decide which features of each amplifier you need to test. Then a test system can be defined. It will probably not be "simple".

 

The big question is how completely you need to check them. I have designed production testers and test processes. So the first thing you must do is decide what your test will verify.

 

You can use a small repetitive spark gap to generate a wideband impulse then have a calibrated known good antenna and a lossy antenna to calibrate a calibrate a small current loop to drive a resonating peak detector for each band with a peak/hold voltage going to a go/nogo comparator. Routine daily checks with each gold or silver standard validate the tester. Using a >=3 dB pad to simulate a bad antenna and a fixture for the current loop around the antenna or a far field same good antenna to transmit to the DUT without local interference.( harder to prevent but easier to test with combined Tx's at one end and RF detectors for each wavelength. If you have tight specs for wide BW then multiple carriers / Rx in each band.

Knowing your unlisted failure root causes will focus your test method.

My Merc SUV has a terrible AM antenna, LNA.

 

How does post #8 relate to checking the function of a single cylinder engine's ignition coil???

 

How does post #8 relate to checking the function of a single cylinder engine's ignition coil???

Do you know the spectrum of a sparkplug up to the gap length then harmonics above that null unless dirty or RC limited.
We once used +/-10 kV to deionize air near the clean room. It caused EMI problems all the way up to the length of the electrode in a cup on sensitive 14" HDD servo-writers.

 

Certainly an electrical arc from a mains frequency source will have a huge array of harmonics: That is to be expected. The ignition coil of a small engine has one function, which is to deliver a a spark across a spark plug gap. Some of those systems do use a coil and battery/breaker points system, others use some form of magneto.
It appears that with this particular system it uses breaker points.
Usually, in this type of system there is a bit of ringing when the points open and the current is suddenly interrupted.
Most triac based dimmers vary the power by delaying the rising edge, with the sine-wave zero crossing allowing the switch off. That is rather different.
My concern with a dimmer based test scheme is the chance of driving the coil primary with a much higher voltage than it is designed for, resulting in a coil overheating and burnout.