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Fig.14 The highlighted [Disp] bar
<Overload>
To indicate an input overload or amplification overload.
If there is no overload, it shows <Overload: NONE NONE>;
If an input overload, it shows <Overload: INPUT NONE>;
If an amplification overload, it shows <Overload: NONE GAIN>;
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, it showa <PLL:LOCKED HARM>/
(4) Menu Bar
As is shown in Fig.15, menu bar is at the right of the main display. There are 6 menus in the menu bar which
correspond to the 6 buttons at MENU on the front panel. The current menu will be highlighted. For example, the
current menu in Fig.15 is [Disp].
