Agilent
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The Agilent 8644B Signal is a synthesized RF signal generator. The Agilent 8644B Signal operates from 252 kHz to 1030 MHz. The Agilent 8644B Signal has Option 002 for frequency coverage to 2060 MHz.[1][2]
The Agilent 8644B is a synthesized RF signal generator with internal modulation capability. The Agilent 8644B includes an internal modulation source with low distortion sinewaves to 400 kHz, triangle, sawtooth, and squarewaves to 50 kHz, and white Gaussian noise with variable amplitude. The Agilent 8644B provides two independent sources for two-tone testing. The Agilent 8644B has an optional electronic attenuator that uses solid-state components instead of mechanical relays for setting output levels.[1][4][5]
The Agilent 8644B is intended for out-of-channel receiver testing for receivers with at least 90 dB selectivity and spurious immunity of at least 85 dB. The Agilent 8644B is used for applications requiring the lowest possible phase noise and spurious performance. The Agilent 8644B is used for mixer testing because it provides high output power. The Agilent 8644B can support avionics work through Option 009, which provides VOR/ILS signal simulation.[1][4]
| Designation | Generation | Vintage | Changes | Source |
|---|---|---|---|---|
| 8644B Option 002 | — | — | Extends frequency coverage to 2060 MHz. | hpwiki.mcguirescientificservices.com[1] |
| 8644B Option 011 | — | — | Adds a built-in 2 GHz frequency counter. | hpwiki.mcguirescientificservices.com[1] |
| 8644B Option 009 | — | — | Provides VOR/ILS signal simulation. | hpwiki.mcguirescientificservices.com[1] |
| 8644B Option 010 | — | — | Provides ultra low leakage. | hpwiki.mcguirescientificservices.com[1] |
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The Agilent 8644B covers 252 kHz to 1030 MHz in the standard configuration. Option 002 extends the Agilent 8644B to 2060 MHz.[1][4][5]
The Agilent 8644B supports AM, FM, and pulse modulation.[1][4]
The Agilent 8644B provides low distortion sinewaves to 400 kHz. The Agilent 8644B provides triangle, sawtooth, and squarewaves to 50 kHz. The Agilent 8644B provides white Gaussian noise with variable amplitude. The Agilent 8644B also provides two independent sources for two-tone testing.[1][4]
The Agilent 8644B is positioned for out-of-channel receiver testing for receivers with at least 90 dB selectivity and spurious immunity of at least 85 dB. The Agilent 8644B is also positioned for mixer testing because it provides high output power.[1][4]
The following facts about the 8644 B Signal are absent from this record as of this revision. First-hand knowledge or a citation closes a gap; every submission is reviewed before publication.
No publicly documented production dates or lifecycle milestones (introduction, end of production, EOL) for the 8644 B Signal are on record.
Answerable by: OEM historical records or a trade-press announcement
The control-system platform and OS era of the 8644 B Signal are not on record.
Answerable by: an engineer who operated it or OEM installation records
No publicly documented failure modes or field errata for the 8644 B Signal are on record.
Answerable by: a field service engineer, process engineer, or maintenance technician
The process node or technology generation of the 8644 B Signal is not on record.
Answerable by: an OEM datasheet or a fab qualification report
No publicly documented compatible parts, consumables, or accessories for the 8644 B Signal are on record.
Answerable by: an OEM parts catalog or a service engineer
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Last updated Oct 17, 2026.