I use HP339A habitually for many years, but there is a problem that the meter panic every time the filter switch of 30 kHz and 80 kHz is turned on and off. Recently I got second hand, so I tried the same modifications as I did a long time ago.
I use HP339A habitually for many years, but there is a problem that the meter panic every time the filter switch of 30 kHz and 80 kHz is turned on and off. Recently I got second hand, so I tried the same modifications as I did a long time ago.
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