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10/26/2008: "HP 5061A C-Field Sensitivity"
While trying to get the atomics trimmed, I decided to do an experiment. Using a Z3801A 10 MHz output as reference, and the TSC-5120 in frequency counter mode, I get the following frequency offsets for a 1000 second average:
| C Field | Frequency | Offset | ||
| HP 5061A #1 (SN 2428A02300) | ||||
| 0.00 | 4.999 999 999 916 | -1.7e-11 | ||
| 4.00 | 4.999 999 999 992 | -1.6e-12 | 5.004.999 999 999 997 | -6.0e-13 |
| 6.005.000 000 000 025 | +5.0e-12 | |||
| 9.99 | 5.000 000 000 102 | +2.0e-11 | ||
| HP 5061A #2 (SN 1248A00857) | ||||
| 0.00 | 4.999 999 999 945 | -1.1e-11 | ||
| 4.00 | 4.999 999 999 973 | -5.4e-12 | ||
| 5.00 | 5.000 000 000 003 | +6.0e-13 | ||
| 6.00 | 5.000 000 000 015 | +3.0e-12 | ||
| 9.99 | 5.000 000 000 051 | +1.0e-11 |