Siemens 9810 Series, User Manual, Page: 207 / 218

Verifying accuracy
A warm-up time of 30 minutes is recommended before beginning energy accuracy
verification testing. At the factory, the meters are warmed up to their typical
operating temperature before calibration to help ensure that the meters will reach
their optimal accuracy at operating temperature.
Most high precision electronic equipment requires a warm up time before it
reaches its specified performance levels. Energy meter standards allow the
manufacturers to specify meter accuracy derating due to ambient temperature
changes and self-heating.
Your meter complies with and meets the requirements of these energy metering
standards.
For a list of accuracy standards that your meter complies to, contact your local
Siemens Industry representative or download the meter brochure from
www.usa.siemens.com/pds.
Reference device or energy standard
To help ensure the accuracy of the test, it is recommended that you use a
reference device or reference energy standard with a specified accuracy that is 6
to 10 times more accurate than the meter under test. Before you start testing, the
reference device or energy standard should be warmed up as recommended by
its manufacturer.
NOTE: Reference equipment with a traceable calibration certificate is
recommended when performing accuracy testing.
Energy pulsing
Energy pulsing LEDs and digital outputs can be used for energy pulsing.
Your meter is equipped with two types of energy pulsing LEDs: visible light and
infrared. These LEDs emit pulses that are then used to determine the accuracy of
the meter’s energy measurements. The pulses of light indicate accumulated
energy; the meter’s accumulations are compared with the reference/standard’s
accumulated energy in order to help determine the meter’s accuracy.
The meter’s digital output can also be used for energy pulsing. A closing (low
impedance) and then opening (high impedance) of the digital output represents a
pulse. If the accuracy testing equipment has a voltage requirement, a current-
limited wetting supply voltage must be provided.
NOTE: Digital outputs on option modules should not be used for meter
accuracy testing.
Verifying accuracy test meter settings
Your meter‘s power system and other parameters must be configured for accuracy
testing.
Meter parameter Value
Volts mode 4W-Wye (4 wire Wye)
PT/CT correction Disabled
Test mode Active
NOTE: In test mode, your meter’s billing
quantities stop accumulating, and the data
is sent to special test mode registers.
These registers are cleared when you exit
test mode.
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