FINALLY had a show with dimmers. Three racks of Sensor 48x2.4Kw, driving 28x 1K-PAR64 6Lamp-Bars, 30-some single cans as
truss warmers, 8x 8-Lights, and 8x 4552
ACL bars. Plus two 24-way Moving Light
Distro's. All four services were 400A, with 100' of 4/0
feeder. One of the Sensor racks had a 1993 serial number! Below are readings taken with all dimmers at FULL, moving lights (34x VL3000s, Spots and Washes) moving all their motors; and all dimmers at HALF, moving lights lamped ON, but not moving.
Based on the data, it appears that: at FULL, the Fluke 30 is nominally close to the 336. However, with dimmers at 50%, the Fluke 30 UNDER-READS by about 15 to 30%: Consistent across phases in each rack, but varies from rack to rack. Notice that the
neutral is approximately 1.73 times higher than any hot
phase, hence the reason for the double
neutral on Touring Racks, that I personally have never seen used, but might consider it if I exceeded 300A on 4/0
feeder.
I suspect the Blue
phase of the 336 is a fluke, as it's really hard to take a reading while the numbers are jumping all over the place, basically watching the bally-hoo on the
meter.
So as much as it kills me to admit it, STEVETERRY is correct.
One must use a trueRMS
meter to get accurate readings with a less-than-100%
level, but the Fluke 30 is accurate enough at measuring total load. So I still have mixed emotions as to whether it was worth it for me to buy a new
meter. I still think I should have bought the model 337.
On a different topic,
this just arrived a few days ago. And one of my
House Electricians didn't know what it was!