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GW Instek GDM-9060/GDM-9061 6 1/2 digit multimeters experience/reviews?
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diodak:
One thing that is very interesting about this multimeter is the boot time, 1 to 2 seconds.
diodak:
One thing that annoyed me from the beginning was the fan. When turned on, it turns on at max PWM. Such a sure start. Then it turns off and waits for the temperature inside the multimeter to rise. Then it increases PWM in 5% increments. The PWM frequency is 400Hz. And it is this low frequency that makes it difficult to replace this fan with a quiet one. That's why I made a circuit that takes PWM and converts it to linearly increasing voltage from PWM. Somehow it works, but at room temperature, it comes to high revs quite quickly.

Originally, the fan is powered from the rectified voltage behind the rectifier bridge. This causes unpleasant/annoying noises when a heavy load in the house is switched on. I have a list of how PWM changes with temperature, but I have to find it (I made the system a year ago and forgot how it was exactly).
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