| 001 | Internal Reference Oscillator |
| 002 | No Internal Reference Oscillator |
| 003 | Operation from 48 to 440Hz ine |
| 004 | |
| 005 | HP-IB Programmable Interface |
| 100 | Internal 11661B Frequency Extension Module (required for RF modules up to 1300 and 2600MHz) |
| Form Factor |
|---|
| Benchtop |
| Plug-In ( /100 ) |
| Frequency |
|---|
| 440 Hz ( /003 ) |
| 2600 MHz |
| Modulation |
|---|
| AM |
| FM |
| Phase |
| Pulse |
| Type |
|---|
| RF ( /100 ) |