PeakTech 4035 Bedienungsanleitung Seite 77

waveform's highest frequency, the instrument will modify frequency value to confine it within the limit of
waveform's highest frequency value automatically.
distortion of other signals will increase gradually. In practical application, you can limit the highest frequency
according to the requirement for distortion. The lowest output frequencies of all the waveforms are 1 μHz.
5.4.1 To set the output frequency
At power-on, the generator outputs a sine waveform with 1 kHz frequency.
If you want to change the frequency to 2.5 kHz, follow the steps:
5.4.2
The current selected frequency is 1.000 000 00 kHz.
5.4.3
Press the numeric keys【2】, 【•】 and 【5】, "2.5" will be showed.
5.4.4
Press the〖kHz〗softkey, displaying 2.500 000 00 kHz.
When you press the unit softkeys, generator changes the frequency of output waveform with the new
setting. You can also change the frequency continuously by using the knob and arrow keys【←】 and
【→】.
Press the〖Freq〗softkey to select the "period" and set the period parameter.
Menu description: the options with triangle arrow on the right don't only represent one
option but different options after pressing many times. You can use knob and numeric keys
to set or modify the parameter when selected option and parameter are displayed green.
5.5 Output amplitude
5.5.1 Amplitude value limitations:
The maximum amplitude and dc offset should conform to the regulations of below formula, if the amplitude
setting exceeds the limitation, instrument will modify the input value automatically to make it confined within
the allowable maximum amplitude.
Vpp≤ 2 x ( 10 －| offset | )
5.5.2 Amplitude units:
All waveforms can be labeled as peak-to-peak amplitude (Vpp). As to sine and square waves, the amplitude
can also be showed as root mean square value (Vrms). If the actual load impedance is 50 Ω, the amplitude
can be power level (dBm) as well for sine wave.
dBm＝10×log (P ÷ 0.001)
Except sine and square wave, others signals cannot be showed as rms value.
If the signal is not sine wave or the actual load impedance is not 50 Ω, the power level (dBm) unit is invalid.
5.5.3 External load:
Output impedance of this instrument is 50 Ω. The actual voltage across the load is in proportion to the ratio
of output impedance value (50 Ω) to actual load value. When you set external load more than 10 kΩ, high
impedance (High Z) is displayed.
2
where P＝(Vrms) ÷ 50
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Except sine wave, as the rising of frequency, the