The PTS 620 is a direct synthesis frequency synthesizer delivering stable, spectrally pure signals across 1 MHz to 620 MHz for precision test, calibration, and development applications. Output spans +3 dBm to +13 dBm into 50 Ω with ±0.5 dB flatness and manual or remote control via BCD, GPIB, or front-panel dials.
Technical Specifications
Frequency Generation
• Range: 1.000 000 0 MHz to 619.999 999 9 MHz
• Resolution: Selectable 0.1 Hz to 100 kHz in decade steps; higher resolutions available
• Output Level: +3 dBm to +13 dBm into 50 Ω; adjustable manually or via analog voltage
• Output Impedance: 50 Ω
• Level Flatness: ±0.5 dB
Frequency Standards
Internal: OCXO (3 × 10⁻⁹/day) or TCXO (1 × 10⁻⁸/day); External: 10 MHz or 5 MHz at 0.4–2.0 Vrms into 300 Ω
Switching Performance
• 100 MHz–10 MHz digit: 20 microseconds
• 1 MHz–0.1 Hz digit: 5 microseconds
• Phase-continuous (DDS-TLU option): 1 microsecond transient, 2 microsecond delay
• Settling: To within 0.1 radian at new frequency
Spectral Purity
• Discrete spurious: −70 dBc (−65 dBc above 310 MHz; −55 dBc at 1/2 & 3/2 f₀)
• Harmonics: −30 dBc full power (−40 dBc reduced levels)
• Phase Noise: −63 dBc (0.5 Hz–15 kHz); L(1 Hz) −100 dBc, L(1 kHz) −110 dBc, L(10 kHz) −120 dBc, L(100 kHz) −125 dBc; floor −135 dBc/Hz
– Key Features
• Decade-selectable frequency resolution from 0.1 Hz upward
• Dual internal oscillator options for long-term stability or cost-optimized operation
• TTL-level parallel BCD input for remote frequency and level programming
• IEEE 488.1/488.2 GPIB compatibility (listener mode and full SCPI control)
• Fast switching between frequencies with sub-microsecond transients (with option)
• 19-inch relay rack format; 35 lbs
– Interfaces and Control
10-position manual dials; TTL-level BCD parallel entry via 50-pin Centronics connector; optional GPIB (IEEE 488.1/488.2, SCPI)
– Environmental & Power
Operating: 0–55 °C, 95% R.H.; 105–125 V, 50–400 Hz, 50 W (100 V, 220 V, 240 V optional)
