HP 5065A C-Field Sensitivity
| C Field | Frequency | Offset |
| HP 5065A #1 (SN 2816A01640) | ||
| 0.00 | e-11 | |
| 4.00 | ||
| 5.00 | e-13 | |
| 6.00 | e-13 | |
| 9.99 | e-11 |
jra on 10.26.08 @ 12:01 PM EDT [link]
John's Geekblog
Sunday, October 26th
jra on 10.26.08 @ 12:01 PM EDT [link]
jra on 10.26.08 @ 12:37 AM EDT [link]
jra on 10.26.08 @ 12:01 PM EDT [link]
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 |
jra on 10.26.08 @ 12:37 AM EDT [link]
Saturday, October 25th
Resetting the Clocks
We had a lengthy power outage in Sepember, 2008, due to the remnants of Hurricane Ike passing through Ohio with 70+ MHP winds. The 7+ day outage outran the new, improved UPS, so all the clocks cooled down. It seemed wise to use the opportunity for some maintenance, so thanks to instructions from Corby Dawson, I've re-aligned CS1, CS2, and RB1. They are now back on-line.
The nominal PPS time (early from GPS PPS, via CNS II clock with 100 second average) is:
CS1: 11.119us (note: CS1 is now running in short time-constant mode)
CS2: 20.501us
RB1: 499.686us
jra on 10.25.08 @ 07:23 PM EDT [link]