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Chapter 5 Optional Parts
This chapter introduces the optional parts of the function generator which are not included as standard.
5.1 Programmable Interface
If users choose to purchase the USB or RS232 interface, the corresponding parts will be installed in the instrument.
The detailed instruction has been described in Chapter 4.
5.2 Frequency Counter
If users choose to purchase the frequency counter, the frequency count board will be installed in the instrument.
The input connector is the “Count In” connector on the rear panel. The detailed instruction has been described in
section 3.12.
5.3 Power Amplifier
If users choose to purchase the power amplifier, the power amplifier board will be installed in the instrument. This
is an independent part of the instrument, with input terminal “power amplifier input” and output terminal “2 time
power amplifier output” located on the rear panel of the instrument. When using the power amplifier, use a
connecting cable to input the signal to the input terminal “power amplifier input”. There will be a
2-time-amplified signal in the output terminal “2 time power amplifier output”. The input signal can be the
channel A signal, or channel B signal, or external signal.
5.3.1 Input Voltage
The power amplifier can amplify the input voltage by 2 times. The maximum output amplitude is 22Vpp.
Therefore, the maximum input amplitude should not exceed 11Vpp. Input amplitude exceeds this limit will cause
distortion.
5.3.2 Frequency Range
The frequency range of power amplifier is 10Hz~150kHz. Amplitude flatness within this frequency range is better
than 3%, and sine distortion is better than 1%. The maximum testing frequency is up to 200kHz.
5.3.3 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).
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