The 5500 has the Improved Performance & High Speed options as well as firmware version 4.10 which is the most recent version.

SPECIFICATIONS:
Signal Source
• Frequency Range 10 Hz to 100 kHz resolution to 0.005%
• Amplitude Range 10 Vrms to < 1 mVrms open circuit
• THD 50 Hz to 10 kHz <0.005% (-106dB)
• Unbalanced Floating or Grounded Output (Balanced 600 ohms Balanced 900 ohms Unbalanced 50 ohms)

Analyzer Section
• Frequency Range 8.5 Hz to >500 kHz
• Level Range 100 Vrms to <10 uVrms (+40 dBV to -100 dBV)
• Level Flatness +- 0.25 dB or better
• Wideband Residual Noise (600 ohms 20 Hz to 100 kHz A weighting) <2.5 uV / -112 dBm
• Narrowband Residual Noise (600 ohm 1 kHz bandpass) <0.7 uV / -123 dBm

Frequency Measurement
• 9.5 Hz to 105 kHz 5 digits
• accuracy better than 100 ppm

THD + N Measurement
• frequency range 9.5 Hz to 105 kHz
• THD+N range >32% to 0.0000% (>-10 dB to -120 dB)
• Fundamental rejection 120 dB or better

Standard Filters
• 400 Hz High Pass 60 dB per decade Butterworth Response
• 30 kHz Low Pass 60 dB per decade Butterworth Response
• 80 kHz Low Pass 60 dB per decade Butterworth Response

IEEE-488 Interface

Special 900 ohm unit ideal for telephone testing."