85685A Agilent Analyzer

Additional Features:

• Operates with the Agilent 8566B and 8568B spectrum analyzers
• Reduces overloading from out-of-band signal
• Improved system sensitivity
• Built-in transient limiter
• Frequency range RFP bypass: Input #1: 20 Hz–50 MHz; Input#2: 20 MHz–2 GHz; DC–18 GHz (nom.)
• Connector type:  Input #1: BNC, 50 ? (nominal); Input #2: Type N, 50 (nom.)
• Maximum safe input power: +30 dBm (1 Watt)
• Attenuator range: 0 – 50 dB in 10 dB steps (nominal)
• Linearity check: Add 3 dB (nominal)
• Preamplifier gain: 20 dB (nominal) for 0 dB RFP attenuation

The 85685A preselector adds:

• Automatic filter tracking
• Input overload protection
• Low system noise to the 8566B and 8568B spectrum analyzers

Add the 85685A RF preselector to the 8566B or 8568B general-purpose spectrum analyzer, and you have a test receiver for specialized applications. The RF preselector enhances these high-performance spectrum analyzers with tracking filters and preamplifiers that cover the 20 Hz to 2 GHz range. The spectrum analyzer/test receiver is sensitive to low-level signals while providing overload protection from out-of-band signals.

The result, for tests in the presence of high-level interference, is a measurement range 30 dB greater than that of the spectrum analyzer alone. (The improvement is even greater in the presence of broadband pulse-interference.)

The test receiver is easy to operate; simply use the spectrum analyzer controls without concern for preselector settings. The preselector automatically adjusts binput-filter tracking, and the spectrum analyzer reports preselector operating conditions on the CRT display. For remote operation with a computer, the receiver system is fully GPIB programmable (GPIB is hardware, software, documentation, and support for IEEE-488 and IEC-625, worldwide standards for interfacing instruments.)