15
Frequency modulation(FM）
Exterior measurement
Parameter calibration
3.1 General operation rule
3.1.1 Data input： If an item is selected, the parameter value can be entered by ten
numeric keys writing from left to right. If there are more than one decimal point
entered in a parameter, only the first one is valid. For the function of “Offset”,
minus can be entered. To make the data come into effect, unit key must be entered
after data input. For wrong data input, there are two ways to modify. If the output
end permits wrong output signal, press any unit key to end and then re-enter data. If
the output end does not permit wrong output signal, re-select the same item and
enter correct data, and then press unit key to end it.
The input of data can use any assorted decimal point and unit, but the generator
will display it in fixed format. For example, the data 1.5kHz or 1500Hz entered will
be effective displayed as 1500.00Hz.
Take the unit key as the ending of a data entering. The corresponding unit,
Hz ，V ，ms ，％ or dB, will be displayed. No display for other units.
3.1.2 Step entering method： In practice, a group of equidistant frequencies or
amplitudes is needed. It will be a messy job to use numeric key entering method.
Using knob will be also inconvenient as the distant value is multi-digit. It can be
easily reached by step entering method. To simplify the operation, the step function
for the frequency and amplitude of channel A is set. By the simple step key, the
frequency or the amplitude can be added or subtracted a step. Besides, the changed
frequency will come into effect at once without pressing the unit key.
To generate a series of frequencies with the distant of 12.5kHz, for example, the
sequence of pressing is as follows:
Press the key of 【Menu】 to select “Step frequency”; press the keys of【1】
【2】【.】【5】【kHz】; The frequency of channel A will be added by 12.5Hz at
each pressing of the key of 【∧】and the frequency of channel A will be reduced by
12.5Hz at each pressing of the key of【∨】. Now a series of increasing-by-distant
or decreasing-by-distant frequencies with the step of 12.5kHz are obtained in fast and
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