FIGURE 9-11. Two-Stator Watthour Meter Connected to a Three-Phase,
Three-Wire Circuit With Current Transformers
2.2.4 Kilowatthour Meter Reading. If a meter has a dial type register, it
will either have four or five dials, as shown in Figure 9-8. The correct
reading for a five-dial meter is 34310; the correct reading for a four-dial
meter would be 4310. Every other dial moves counterclockwise. When the
pointer is between two numbers, record the lower of the two numbers. When the
pointer appears to be directly on a number, look at the dial to the right. If
the pointer on the dial to the right has passed "O" toward "l," then use the
number the pointer appears to be on. If the pointer on the dial to the right
has not passed "O," use the previous, lower number on the dial being read.
Subtract the previous reading from the present reading to determine
kilowatthours used during the time interval. If the words "multiply by*'
followed by a number appear on the meter nameplate, the reading on the
register must be multiplied by the number shown to obtain the correct value.
2.2.5 Meter Recording Developments. Recent developments in the field of
meter recording promise increased accuracy and automatic processing of data.
Meters currently available allow meter readings to be recorded even when the
meter is inaccessible. Another development allows meter readers to record
meter data on a hand-held device which resembles a pocket calculator. The
hand-held device is preprogrammed to automatically evaluate the entered
reading for tolerance from past readings. If beyond a programmed tolerance,