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| Hioki 3227 AC voltage input change |
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| R-1125F:
I picked up a Hioki 3227 that is set for 100VAC power. I need to change this to 120VAC. There are many taps on the transformer input but nothing is marked. Could someone tell me what jumpers to change? |
| DavidKo:
I expect that now are 2 windings in parallel. Pictures will help. Plug the device to AC100 (I use autotransformer) measure the voltages across the taps. Usual connection is 0-100-10-10 and second winding same 0-100-10-10. In your case you will leave the zeros interconnected and move the parallel connection of the "phase" to the last taps. |
| R-1125F:
Thank you for the reply. H I figured it out. What I did was measure the winding resistance and picked the highest one for 120V. It seems to work fine (no smoke). The confusing part is that there were 9 wires for the 2 primaries. One wire went to the transformer frame/shield. The other 8 wires were just a standard dual primary multi-voltage transformer. The other confusion was a jumper for the AC input. That also needed to be moved. I have attached the before and after photos for the 100V and the 120V jumper connections. Hioki is really bad about posting service information. |
| DavidKo:
Hioki does not support older equipment. The jumper seems similar to one in my Hioki 7020 only split to 2 jumpers. |
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