Repair and service evaluation for HP/Agilent E4428C, E4425B, E4424B, and E4421B signal generators. This service restores these instruments through diagnostic procedures, component-level troubleshooting, and repair to original operational specifications. The E44xxB/C series delivers precise signal generation across multiple frequency bands, from 100 kHz or 1 MHz up to 3 GHz, 6 GHz, 13 GHz, or 20 GHz depending on model selection.
Technical Specifications
Frequency coverage spans 100 kHz or 1 MHz to 3 GHz (E4421B), 6 GHz (E4424B), 13 GHz (E4425B), or 20 GHz (E4428C). Output power ranges from -136 dBm to +20 dBm or +25 dBm with precise level control. Amplitude accuracy maintains ±0.5 dB across operational frequency and power ranges. Frequency resolution achieves 1 Hz or finer for accurate signal generation.
Phase noise performance supports adjacent channel and sensitive receiver testing. Harmonic distortion remains low to preserve signal integrity. Spurious performance is specified in dBc relative to carrier. Frequency stability is expressed in ppm/°C or over 1-hour and 24-hour periods.
– Key Features
• Waveform generation: sine, square, triangle, ramp, and noise
• Analog modulation: AM, FM, phase modulation
• Pulse modulation with variable width and delay
• Digital modulation options (model-dependent): ASK, FSK, PSK, QAM
• Fast frequency and amplitude switching for automated test sequences
• Settling time optimized for transient response
• Power input: 90-264 VAC, 47-63 Hz
– Typical Applications
Signal generation for receiver sensitivity and selectivity testing. Adjacent channel interference measurements. Modulated signal validation. Frequency agility and switching performance characterization. Pulse and digital modulation scheme validation.
– Compatibility & Integration
Service evaluation supports all E4421B, E4424B, E4425B, and E4428C variants with frequency-specific restoration to original specifications.
