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Karsten · 12th Nov 2019, 9:43 pm

HCONT, A/R, S/R, CH/R, C/H tests remain unaffected as they are independent of the grid voltage circuit.
SET~ had been modified before: voltage between the 99 V and 137.5 V taps is measured, similar to CT160A.
I have no means to run the tester with 500 Hz but I cannot see any functional obstacles. The regulator circuit "should work" as well. BTW, who will use the instrument nowadays on mains frequencies other than 50/60 Hz?

12th Nov 2019, 9:43 pm	#3
Karsten Retired Dormant Member Join Date: May 2012 Location: Moenchengladbach, Germany. Posts: 41	Re: AVO CT 160 Regulated Grid Voltage Supply HCONT, A/R, S/R, CH/R, C/H tests remain unaffected as they are independent of the grid voltage circuit. SET~ had been modified before: voltage between the 99 V and 137.5 V taps is measured, similar to CT160A. I have no means to run the tester with 500 Hz but I cannot see any functional obstacles. The regulator circuit "should work" as well. BTW, who will use the instrument nowadays on mains frequencies other than 50/60 Hz?