The HP Agilent 204D Audio Oscillator is a small, lightweight capacitive-tuned oscillator which is both versatile and easy-to-use. The Agilent HP 204D is identical to the 204C except the output attenuator has a range of 80 dB in 10 dB steps, overall accuracy of ±0.3 dB (+10 to -60 dB ranges); ±0.5 dB on -70 dB range.