The AV-151 series is a family of high-voltage (or, for the AV-151F, high-current) function generators and variable-gain amplifiers. All models include both an internal oscillator that can generate sine, triangle, and square waves, and a variable-gain amplifier mode, which permits generation of more complex high-voltage waveforms. The AV-151C family provides a peak output of +/-100 Volts into high impedance loads (> 10 k) at frequencies of up to 200 kHz. For higher speed applications, the AV-151H family operates to 1 MHz and at amplitudes to +/-50 Volts (into >10 k). The -C versions provide output parameters similar to those of the -B models, but do not include the GPIB or RS-232 interfaces (i.e. no computer control or LCD display) or the pulse mode feature. The settings are controlled by front-panel switches and dials.