Output Load; Offset-Setting; Dc Output Voltage - PeakTech 4055 MV Bedienungsanleitung

4.2.6. Output load:

* The setting value of amplitude is calibrated when the output end is open. The real voltage of output load
is the setting value of amplitude multiplied by the assignment ratio of load impedance (including
inductance and capacitance) and output impedance. The output resistance is about 50. When the load
impedance is high enough, the assignment ratio approaches to 1. The voltage loss of output impedance
can be neglected. The real voltage approaches to the setting value of amplitude. But when the load
impedance is lower, the voltage loss of output impedance cannot be neglected. It should be paid more
attention that the real voltage does not accord with the setting value of amplitude.
* With 50Ω output resistance, a momentary short-circuit of the output port makes no damage to the
generator, but the users should try to avoid long time short-circuit under high voltage output as a danger
of making damage to the generator. The generator has function of opposite voltage protection, with which
the generator close output automatically, make an alarm with the output indicating light off when
carelessly connect a high voltage (less than 30 V) to the output port. Open the output by pressing
【Output】key only after the fault cleared.

4.2.7. Offset-setting:

In some cases, certain DC components should be contained in the AC signal to be output so as to
produce DC offset.
Press 【Offset】 key, the light of which will be on and the present offset value will be displayed. Input
offset value with the numeric keys or adjusting knob for the output signal to generate this DC offset to the
output.
The relationship between the maximum DC offset and amplitude value should be below formula, if the
setting of offset exceeds, the generator will modify it until it is within the limit of the maximum offset value.
It must be paid attention that the summation of the half of the output amplitude of signal and the absolute
offset value should be less than 10V to guarantee the peak value of signal less than ±10V. Otherwise, the
amplitude-limited distortion will be induced. Besides, when the attenuation of channel A is selected auto,
the output offset will attenuate with the attenuation of amplitude. For the Vpp of amplitude greater than
2V, the real output offset is the set offset value. For the Vpp of amplitude greater than 0.2V but less than
2V,the real output offset is tenth of the set offset value. For the Vpp of amplitude less than 0.2V, the real
output offset is one percent of the set offset value.
It will be more convenient using the numeric keys than the knob when adjusting DC offset for output
signal. In general case, whether DC offset is positive or negative, DC level will rise if turning right and fall
if turning left. Sign of positive and negative will change automatically when passing through zero point.

4.2.8. DC Output voltage:

*
* If the amplitude attenuation is set to 0 dB, the output offset value is equal to the preset offset value and is
independent of the amplitude.Set amplitude at 0V, the offset value could be set arbitrarily within ±10V
range, the generator is now a DC voltage power supply and outputs specified DC voltage signal.
【offset】≤10-Vpp÷2
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