The Stanford Research  SR785 is a 2 Channel Dynamic Signal Analyser used for measurements involving servo systems, acoustics, vibration testing, modal analysis  or machinery diagnostics.
• Frequency operation DC to 102.4 kHz bandwidth
• 90dB dynamic range
• 145 dB dynamic range in swept-sine mode
• Real-time octave analysis
• Up to 32 Mbyte memory
• GPIB and RS-232 interfaces  as standard

• Stanford Research SR785 - Datasheet (644 kB)