Voltage Bias Amplifying (VBA) analysis

1. switch on the voltage supply.
2. use multimeter + banana plug to adjust the required voltage which allows the transistor of failing pin of failing uni
    turn on. (if 0.7V then try 0.4-0.6V first)
3.put unit inside the SPEM
4. use banana plug to connect two pins required to be measured.
5. CCD Imaging magnification switch to 2x. (default setting)
6. click on the eye (manual adjustment to put the unit under the observing len)
7. close the SPEM cover.
8. measure the ouptut to pc is at analogue mode.
9. turn on laser supply. (be caution for the laser power percentage, too high will destroy the unit)
10. change magnification to 5x in CCD and aquire image to measure the image is in focus.
11. change to laser mode and aquire image and focus the unit.
12. change to laser auxiliary mode use point scanning mode, open voltage supply, start to observe VBA spot.
13. if there is any overload, adjust the sensitive.
14. if no spot was observed, change the filter bandwidth to filter out the noise.
15. close laser auxiliary and on overlay for laser.
16. observe the spot and capture the image.
17. turn off the laser when finished using.