Agilent/Keysight 908A

The Agilent/Keysight 908A is a signal generator engineered for testing and calibration of communication systems, audio equipment, and electronic devices. It delivers stable, accurate signals with minimal distortion and noise to meet demanding laboratory and engineering requirements. The instrument provides flexible modulation capabilities and precise output control across its operating range.

– Technical Specifications

Output Power
Output levels range from +13 dBm down to -143.5 dBm, with level accuracy of ±1 dB (typically 0.5 dB) maintained down to -127 dBm across the operating temperature range of 0 to 55 °C.

Signal Purity
Harmonic distortion is specified at <0.5% THD plus noise (typical <1.5%) for FM modulation across all specified deviations and rates. AM depth below 70% exhibits <3.0% THD plus noise. Low single-sideband phase noise supports adjacent channel selectivity testing.

Modulation Capabilities
The 908A supports AM and FM analog modulation with FM rates from 400 Hz and 1 kHz internally, and externally from DC/5 Hz to 100 kHz (3 dB bandwidth). FM deviations reach 40 MHz with rates up to 10 MHz. Pulse modulation is also supported.

Frequency Stability
Frequency stability in DC mode exhibits <10 Hz per hour drift (typical).

– Key Features

• Analog modulation: AM, FM, FM/AM, AM/AM, FM/FM, and Pulse modes
• Wide output range: +13 dBm to -143.5 dBm
• Low THD performance in FM and AM modes
• Low phase noise for precision communication system testing
• Stable frequency reference with minimal drift
• Full temperature stability from 0 to 55 °C

– Typical Applications

• Communication system testing and validation
• Audio equipment calibration and verification
• Electronic device characterization
• Adjacent channel selectivity measurements
• Signal integrity and distortion analysis

– Compatibility & Integration

The 908A integrates into laboratory environments requiring precise analog signal generation with stable output characteristics and low noise performance.