Basic Operation
QC1936 Digital Storage Oscilloscope 50
2.17 Power Amplifier(Optional)
If users set the Power Amplifier Out to turn on, the power amplifier board will work in the
instrument. When using the power amplifier, use a connecting cable to input the signal to the input
terminal “GEN OUT”, there will be a 2-time-amplified signal in the output terminal “2 time power
amplifier output”. The input signal should be the GEN OUT signal, not external signal.
Frequency Range
The frequency range of power amplifier is 10Hz~150k Hz. Amplitude flatness within this frequency
range is better than 3%, and sine distortion is better than 1%. The maximum testing frequency is
up to 200 kHz.
Output Power
The equation for output power of power amplifier is:
P=V
2
/R
P is the output power, with the unit of W
V is the output amplitude RMS value, with the unit of Vrms
R is the load resistance, with the unit of Ω
The maximum output amplitude is up to 22Vpp (7.8Vrms). The minimum load resistance is 2Ω. As
the ambient temperature increases, the output signal frequency increases too. The lower output
signal distortion is required, the smaller the max.output power is. Generally, the maximum output
power can be up to 7W (8Ω) or 1W (50Ω).
Output Protection
The power amplifier has short circuit protection and over heat protection. It may not be burnt out in
common operation. However, to prevent damage to power amplifier’s performance, long time
short circuit output should be avoided. Please also avoid to frequently using the maximum value of
the frequency, amplitude and load.
Power Amp Out
Power Out: Turn on or turn off power amplifier out.
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