HP 5061 Cesium Resonance
- HP 3325A frequency synthesizer
- HP 3456A digital voltmeter
- HP 5061A cesium beam frequency standard
- The 3325A generates the 12.x MHz signal
- The 5061A generates the 9180 MHz signal
- A 5 MHz house standard drive both the above
- 12.x MHz injected into 5061A harmonic generator A4 J2
- 5 MHz reference injected into 5061A 90 MHz multiplier A3 J5
- Beam current measured across meter M1 in "Beam I" position
- 5061A operated in open loop mode with modulation off
- A QBASIC program drove the 3325A and the 3456A over GPIB
- The 12.x MHz synthesizer was stepped 10 Hz per sample
- Sample rate was 2 or 3 samples per second
- Data collected for 12.450 MHz to 12.800 MHz
- 35,001 data points raw data (630 k bytes)
- Plots generated with Excel
500 kHz wide plot of the entire scan showing all seven resonances:
Zoom in 10x for a view of the middle peak only:
Zoom in another 10x for a closer look:
Zoom in another 10x and see just the 9192.631770 MHz center peak:
FWHM is 550 Hz giving a resonator Q of 17 million.
Final 50x zoom (10x vertical 5x horizontal) to see the very top of the peak:
A four foot long chart recorder version of the seven resonances.
Click on link and scroll down with your browser.
Lastly, a view of each of the seven peaks.
New data from Monday night (12-Mar-2001).
- 10 kHz wide scan
- 1 Hz resolution
- DVM set for 100 PLC (power line cycles) to remove measurement noise
- Sample rate was about 1.5 seconds per point
- It ran overnight
- 10,001 data points raw data (190 k bytes)