my new rubidium frequency standard unit FE-5680A arrived finally.
After some time of "idle" mode in box on the shelf I found the time to remove it and check. As I am planning to install it in my ham radio shack as main reference > here is first short test and some quick measurement.
After heating up and locking the temperature stabilized and stay around +63C...
The first what I wanted to see was the sine wave curve and then quick frequency drift check.
As the start-up of the unit seemed to be as it should and all parameters also I tried to measure the drift in few hours after locking it in order to verify the short term stability of this unit.
The technical specification at glance:
FE-5680 Tech Manual Table 3, Sheet 9 (PDF page 10/19):
- Frequency 10 MHz
- Type Sinusoidal
- Amplitude (minimum) 0.5 Vrms into 50O(+7dBm)
- Adjustment Resolution <1 x 10-12 over range of 3.8 x 10-5
- C-field potentiometer Resolution 1 x 10-11 over range of 3 x 10-9
- Drift: 2 x 10-9 per year, 2 x 10-11 per day
- Short Term Stability: 1 sec … 100 sec 1.4 x 10-11 t
- Retrace 5 x 10-11
- Phase Noise (fo=10 MHz) @10 Hz: -100 dBc, @100 Hz: -125 dBc, @ 1000 Hz: -145 dBc
- Input Voltage Sensitivity 2 x 10-11 (15V to 16V)
- Frequency vs.Temperature (-5C to +50C) ±3 x 10-10
- Spurious Outputs -60 dBc
- Harmonics -30 dBc
- Loop Lock Indication: > 3Vdc=Unlocked, < 1Vdc=Locked
- Input Power (@25 C) 11 watts steady state, 27 watts peak
- DC Input Voltage/Current
- 15V to 18V @ 1.8A peak and 0.7A steady-state
- …(except Opt 25: +22V to +32V @ 1.25 peak, 0.5A steady-state)
- Ripple +15V: < 0.1Vrms
- Warm-up Time < 5 minutes to lock @ 25C
- Size: 25 x 88 x 125 mm, .98 x 3.47 x 4.92 inches
- Weight 434 grams, 15.3 oz.
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