Verifying accuracy
Verifying accuracy overview
All meters are tested and verified at the factory in accordance with International Electrotechnical
Commission (IEC) and American National Standards Institute (ANSI) standards.
Your digital power meter typically does not require re-calibration. However, in some installations a
final accuracy verification of the meters is required, especially if the meters will be used for
revenue or billing applications.
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.
Accuracy test requirements
The most common method for testing meter accuracy is to apply test voltages and currents from a
stable power source and compare the meter’s readings with readings from a reference device or
energy standard.
Signal and power source
The meter maintains its accuracy during voltage and current signal source variations but its
energy pulsing output needs a stable test signal to help produce accurate test pulses. The meter’s
energy pulsing mechanism needs approximately 10 seconds to stabilize after every source
adjustment.
The meter must be connected to control power in order to conduct accuracy verification testing.
Refer to your meter’s installation documentation for power supply specifications.
DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
Failure to follow these instructions will result in death or serious injury.
Verify the device’s power source meets the specifications for your device’s power supply.
Control equipment
Control equipment is required for counting and timing the energy pulse outputs from a visible
LED, infrared LED or onboard digital output.
•
Most standard test benches have an arm equipped with optical sensors to detect LED pulses
(the photodiode circuitry converts detected light into a voltage signal).
•
The reference device or energy standard typically has digital inputs that can detect and count
pulses coming from an external source (i.e., the meter’s onboard digital output).
9810 series - User manual Verifying accuracy
7EN05-0390-08 282
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