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The HP 8648D 4000 MHz synthesized signal generator delivers solid performance and reliability. This signal generator provides the features and performance needed for semi-automated receiver testing and for use in a variety of general-purpose applications over a 9 kHz to 4000 MHz frequency range. The HP 8648D provides ±1 dB absolute amplitude accuracy up to 2.5 GHz. It offers ultra stable dc FM, with ±500 Hz carrier frequency accuracy below frequencies of 1001 MHz, and low RF leakage. Applications such as receiver tuning and alignment benefit from the simple user interface. These signal generators are so easy to learn and use that experienced operators are no longer required. With 300 full storage registers and ten user-definable sequences, the signal generator easily adapts to any test procedure. Once setups are stored in registers, operators can quickly sequence through them, either from the front panel or through a remote keypad (HP 83300A). In addition, the HP 83301A memory interface provides the means to transfer register information from one HP 8647/48 to another. Specifications. Frequency: 9 kHz to 4000 MHz. Resolution: 0.001 Hz (Display: 10 Hz). Switching Speed (typical): <1001 MHz: < 75 ms; >=1001 MHz: < 100 ms. Accuracy (after one hour warm-up and within one year calibration): Typically ± 3 x 10^–6 x carrier frequency in Hz, ± 0.15 x 10^–6 x carrier frequency in Hz for Option 1E5 (typically ± 0.072 x 10^–6 x fc). Internal Reference Oscillator Accuracy and Stability (calibration adjustment dependent; after one hour warm-up and within one year of calibration), ± aging rate ± temperature effects ± line voltage effects. Internal Reference Oscillator Output: 10 MHz, typically > 0.5 Vrms into 50 ohm. External Reference Oscillator Input: Accepts 2, 5, 10 MHz ±5 ppm and a level range of 0.5 V to 2 Vrms into 50 ohm. Harmonics (output <= 4 dBm): < –30 dBc. Subharmonics (output <= +4 dBm) < 1001 MHz: –60 dBc; >= 1001 MHz: –50 dBc: > 3200 MHz: –40 dBc. Output Range: <= 2000 MHz: +13 to –136 dBm: > 2500 MHz: +10 to –136 dBm. Options. Opt 1EA High Power. Opt 1E6 Pulse. Opt 1E2 Modulation Generator. Opt 1E5 High-Stability Timebase.
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