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accurate, the period values of real output signal will be greatly different. The user
should know fairly well.
3.2.3 Setting of amplitude of channel A： Press the key of 【 Ampl】 and the
current amplitude will be displayed. Then use the numeric keys or the knob to enter
the amplitude value. The amplitude will be output at the end of “Output A”.
3.2.4 Format of amplitude value： There are two ways to display and to enter the
amplitude of channel A. Press the key of 【pp/rms】 to circularly select peak-peak
value or virtual value and the corresponding indicator light will be on. The displayed
value of the amplitude will vary with the different format.
Although there are two formats for amplitude values, the working way inside the
generator is Vpp. Limited by the amplitude resolution, a little difference will be
produced between the former and the latter after exchanging. Entering 1Vpp for sine
wave, for example, the virtual value after changing is 0.353Vrms. But entering
virtual value of 0.353Vrms, the Vpp after changing is 0.998Vpp. Of course, the
difference is within the error range. If the waveform is square, the conversion
coefficient is 2. Vrms is used only in the function of “Frequency of channel A” and
the waveform is sine or square. For other functions or other waveforms, only Vpp but
not Vrms will be used.
3.2.5 Amplitude attenuator： The generator is set to “Auto” when startup or reset.
Press the keys of【Atten】 and “AU” will be displayed. Then the generator selects
the attenuation proportion automatically according to the magnitude of the set
amplitude. The attenuation switches when the output amplitudes are 2Vpp，0.2Vpp
and 0.02Vpp. Now, higher amplitude resolution and signal-to-noise can be obtained
regardless of the magnitude of amplitude. The distortion of waveform is smaller. But
a little instant jumping will occur for output signal when attenuation switching,
which is not allowed in some cases. So the fixed attenuation way is set for the
generator. Pressing the key of 【Atten】, the attenuation value can be entered by the
numeric keys. The attenuation is 0dB when the data entered＜20, 20dB when the data
entered ≥20, 40dB when the data entered≥40, 60dB when the data entered≥6 and auto
when the data entered≥80. The knob can also be used to adjust the attenuation. The
attenuation will change one gear for each step. If the fixed attenuation way is
selected, the attenuation step will not be changed when the amplitude of signal
changes So that the output signal within the whole amplitude range will be changed
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