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  1. Townshend

    UPS, Waveform, THC, and Phases

    Follow up question. This morning I got a Y cable and connected the UPS to one end and the Amprobe to the other. What's interesting is I noted the following: THD: 9.5-9.6% h01: 100% h03: 9.0% From what I understand, h01 is referencing itself and therefore will always be 100%? However, h03...
  2. Townshend

    UPS, Waveform, THC, and Phases

    Figured out my own answer and did not need the line splitter. Leveraged the leads and went direct to the outlet to determine my THD is 11.2%. https://files.engineering.com/getfile.aspx?folder=8ef2d70a-42d8-4290-ac62-092b7339b64b&file=thd.jpg
  3. Townshend

    UPS, Waveform, THC, and Phases

    Follow up question. I purchased an Amprobe ACD-51NAV and on A~ mode under THD when the issue is occurring while the UPS is on battery power it states rd.y but then when it flips to line power momentarily the meter reads between 68.8 and 70.9. This is on a Klein x10 line splitter. Am I reading...
  4. Townshend

    UPS, Waveform, THC, and Phases

    3DDave, yes, same exact model. I may actually be able to find out how the grid is aligned to determine where a fault might be generated from. The one residence I tested at that exhibited the same behavior is 3.5 miles away in another city. In reading the thread you posted, it looked like he...
  5. Townshend

    UPS, Waveform, THC, and Phases

    At my house I have an 1100VA UPS (WB-OVRC-UPS-1100-1) where I have been encountering issues since Day 1 back in March. Periodically for periods of time the UPS will alternate rapidly between line and battery, about a second at a time (attached is a video of the occurrence). I had an electrician...

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