User's Manual

Operation: CVSO OpenWay Register
58 CENTRON® OpenWay™ Meter Technical Reference Guide
6 For element tests, the FL and PF pulses can be divided by the number of elements,
always rounding up for fractional values.
The total test time for a series FL, PF, LL sequence can be shortened by more than one
minute compared to the time required for an electromechanical meter or a solid-state meter
using the equivalent test constants. If LL element tests are used, the time savings will be
much greater.
Recommendations for Minimum Variability
The variability of testing a CENTRON OpenWay meter can be reduced by lengthening the
test times (using more pulses). Doubling or tripling the recommended minimum test time
will reduce the variability by a factor of two or three. Very little improvement is realized by
running longer than about 45 seconds for each test.
Demand Testing
Testing consists of comparing the readings displayed on the CENTRON OpenWay meter to
the actual demand as determined using a high-accuracy RMS responding reference standard.
The standard should have pulse outputs proportional to Wh/pulse (or VAh/pulse).
Pulses from the reference standard are accumulated over one demand interval, and then the
total pulse count representing watt-hours or volt-ampere-hours is converted to an average
demand value using the formulas in Demand Calculations.
Because of the high accuracy of the CENTRON OpenWay meter, the following is the
recommended procedure for testing these meters.
Draft