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SECTION III OPERATION MANUAL
Utrecht
- 47 - Ref 002
9. FREQUENCY AND OVERLOAD INFORMATION
For METER, SCOPE and SPECTRUM screens
The synchronization frequency is measured on the input selected in the meter
configuration menu (U1, U2, U3, I1 or AUTO). If no valid frequency can be detected (after
software filtering) the Instrument will, if in AUTO mode, scan the other channels for a
signal that could be used for synchronization. If no stable frequency signal can be found,
the Instrument will use the default (50-60 Hz) frequency selected in the METER
configuration menu and display this frequency value in inverse.
An overload detected on any input is indicated on the instrument display in inverse mode
of the particular input value.
Overload conditions are:
a) Voltage inputs: U > 550 V ac r.m.s. and / or U > 770 Vp,
b) Current inputs: U > 2 V ac r.m.s. and / or U > 2.5 Vp
48


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