The Tektronix 494P is a portable spectrum analyzer delivering signal analysis from 10 kHz to 21 GHz via coaxial input, with extended capability to 325 GHz using optional external waveguide mixers. Built for field deployment and lab environments, this MIL-rugged instrument combines synthesized tuning precision with an 80 dB display dynamic range and 30 Hz minimum resolution bandwidth. Engineers rely on its amplitude measurement span of -117 dBm to +30 dBm, integrated frequency counter accurate to ±9 Hz at 1 GHz (with Opt. 03), and full IEEE-488 programmability for automated test sequences.
Technical Specifications
Frequency Coverage: 10 kHz to 21 GHz (coaxial); up to 325 GHz with external waveguide mixers
Resolution Bandwidth: 30 Hz to 1 MHz; selectivity ≤7.5:1 (-60 dB/-6 dB); video filter 3 Hz to 30 kHz
Amplitude Measurement: -117 dBm to +30 dBm input range; +30 dBm maximum safe CW input; 75 W peak pulse handling (1 µs, 0.1% duty)
Frequency Counter: Built-in, 325 GHz capability; ±9 Hz accuracy at 1 GHz (Opt. 03); ≤2 × 10⁻⁹/day aging
Display: 80 dB dynamic range; nonvolatile memory for setups and waveforms; built-in HELP manual
Connectors: N(f) coaxial input (50 Ω standard; 50/75 Ω optional); SMA LO outputs; TNC external mixer input; BNC horizontal/vertical outputs and trigger input
Power: 210 W max; 90–132 VAC or 180–250 VAC, 48–440 Hz
Physical: 20 × 18 × 12 inches; 52 lbs with standard accessories
– Key Features
• Synthesized tuning for deterministic frequency control
• Keypad entry for center frequency, span, and RBW selection
• Optional 110 MHz IF output (Opt. 42) for external signal processing
• Switch-selectable impedance (50/75 Ω)
• Rackmount and benchmount configurations available
– Typical Applications
• EMI/RFI compliance and field testing
• Component and subsystem characterization to 21 GHz
• Millimeter-wave analysis with external mixer modules
• Digital radio and communication signal measurement (Opt. 41)
– Compatibility & Integration
Full GPIB remote control enables integration into automated test systems. Optional waveguide mixer sets (Opt. 20, 21, 22) extend analysis to 60 GHz. Multilingual help text available in English, German, French, and Spanish.
