Low voltage on T7 & T9 during transformer secondary test (Issue Solved)

[paultc]

My home's voltage measured 123.3V AC during the powerline  voltage test so I wired the power transformer as per page 25 (115-130V AC).  However, when I conducted the transformer secondary test (page 29) I got only 3.37V AC across T7 and T9.  However. the reading across T11 and T12 was well within specs at 181.8V AC.  I rechecked the voltages several times and re-positioned the alligator clips to make sure the connections were good, and but T7/T9 readings were pretty consistent (3.36–3.38V AC). Checked all soldering joints under a magnifying glass and they seem to be OK. 

I read in a previous post that some multimeter's don't read low voltage AC very well, although mine is fairly new (bought a year ago).

Any help on what the the problem might be would be greatly appreciated!

[2wo]

Try a fresh battery in your meter... John

[Paul Joppa]

Just checking to be clear - you said "...only 3.37V AC across T7 and T9," which is somewhat ambiguous. You should get 6.6 volts with one probe on T7 and the other on T9.  T8 is the centertap, which is grounded to safety ground (the chassis), so if one probe is grounded and the other is on T7 or on T9, you will get 3.3VAC.

[paultc]

Paul Joppa,

Thanks. Problem solved base on your input.  I must have accidentally tested it initially using T8 (ground) and T7. With the proper T7 to T9 connection I get 6.6VAC. Good to go.

Sometime it takes a fresh set of eyes to figure out the obvious.

Best regards,

Paul TC