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If there are both an input overload and amplification overload, it shows <Overload:
INPUT GAIN>. In this case, reduce the input as soon as possible to prevent
over-voltage damage to the instrument.
<Freq>
Display the frequency of input signal.
<Ref. Source>
The mode of the reference signal: Internal or External.
<PLL>
The status of PLL.
If the internal reference is used, it shows <PLL: UNLOCK>.
If the external reference is used, it shows <PLL: LOCKED>.
If <Harmonic> is greater than 1, show <PLL: LOCKED HARM>.
Fig.14 Main Interface: Monitoring Bar
(4) Function Bar
Fig.15 Main Interface: Function Bar