|
|
The HP 8644B Signal Generator builds on the HP 8643A’s performance by lowering SSB phase noise(–136 dBc/Hz versus –130 dBc/Hz) and lowering spurious(–105 dBc versus –100 dBc). The HP 8644B can be used either for specific tests that require the lowest SSB phase noise or for applications with diversified performance requirements. FM rates of up to 2 MHz and deviations to 20 MHz peak are suitable for many applications such as higher-rate digital communications. An optional pulse modulator with on/off ratio of > 80 dB and rise/fall times of < 5 ns is available. Pulse width and delay can be internally adjusted between 50 ns and 999 ms, eliminating the need for an external pulse generator. Specifications. Frequency Range: 0.252 to 1030 MHz, (0.252 to 2060 MHz Option 002). Frequency Resolution: 0.01 Hz. Frequency Stability: 3 x 10^–10/day (Option 001). Spectral Purity SSB phase noise @ 1 GHz (20 kHz offset): –136 dBc/Hz. Spectral Purity Nonharmonics: (>10 kHz offset) < –105 dBc, 0.252 to 1030 MHz. Spectral Purity Harmonics: < –27 dBc, output <= +10 dBm. Output Level Range: +16 to –137 dBm, +13 dBm (Option 002, 005). Output Level Resolution: 0.1 dB. Output Level Absolute accuracy: ±1 dB, output >= –127 dBm. Amplitude Modulation Bandwidth (3 dB) <= +7 dBm: dc to >100 kHz, >128 MHz (Resolution: 1%). Frequency Modulation Bandwidth (3 dB): dc to 100 kHz (Resolution: 2.5% of setting). Pulse Modulation On/off ratio: >50 dB; >80 dB, >1030 MHz (Rise/fall time, 10 to 90%: <100 ns). Internal Modulation Source Waveforms and rates: Sine; white Gaussian noise (0.1 Hz to 400 kHz); Triangle, sawtooth, square (0.1 Hz to 50 kHz). Frequency Sweep Digital sweep: Digitally stepped sweep over entire frequency range. Linear/log selection. 0.5 to 1000 s sweeps. Options. 001 High-Stability Timebase. 002 2 GHz Doubled Output. 003 Rear-Panel Input/Output. 004 Low-noise Option. 005 Electronic Attenuator (N/A with Option 002). 008 Pulse Modulation. 009 Specified VOR/ILS. 010 Reduced-Leakage Configuration. 011 2 GHz Internal Frequency Counter.
|