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UMG 509
Mains frequency
The UMG 509 requires the mains frequency for the
measurement and calculation of measured values.
The UMG 509 is suitable for measurements in networks
whose mains frequency is in the range 40Hz to 70Hz.
The mains frequency can be stipulated by the user
or automatically determined by the device.
• Auto - Factory default setting. The mains
frequency will be measured.
• 50Hz - The mains frequency is fixed at 50Hz.
The mains frequency will not be measured.
• 60Hz - The mains frequency is fixed at 60Hz.
The mains frequency will not be measured.
Automatic frequency determination
For the UMG 509 to automatically determine the
frequency, a voltage (V-Vref) greater than 10Veff must
be applied to at least one of the voltage measurement
inputs.
If there is no sufficiently high measured voltage available,
the UMG 509 cannot determine the mains frequency
and thus cannot perform any measurements.
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