Stanford Research Systems FS725/3C Benchtop Rubidium Frequency Standard

Output frequencies: 10MHz sine, 5MHz sine, 10µs wide 1 pps pulse

Amplitude: 0.5Vrms, ±10%

1 pps pulse amplitude: 2.5V into 50Ω, 5V into High-Z loads

Phase noise (SSB)

<–130 dBc/Hz (10Hz)

<–140 dBc/Hz (100Hz)

<–150 dBc/Hz (1 kHz)

<–155 dBc/Hz (10 kHz)

Spurious: <–100 dBc (100 kHz BW)

Harmonics: <–40 dBc

Accuracy at shipment: ±5×10^–11

Aging (after 30 days):

<5×10^–11 (monthly)

 <5×10^–10 (yearly

 5×10^–9 (20 years, typ.)

Short-term stability (Allan variance): 

<2×10^–11 (1 s)

<1×10^–11 (10 s)

<2×10^–12 (100 s)

Holdover: 72 hour Stratum 1 level (1×10^–11)

Frequency retrace: ±5×10^–11 (72 hrs. off, then 72 hrs. on)

Settability: <5×10^–12

Trim range: 

±2×10^–9 (0 to 5VDC) 

±0.5 ppm (via RS-232)

Warm-up time:

<6 minutes (time to lock)

<7 minutes (time to 1×10^–9)

Environmental

Operating temperature: +10 °C to +40 °C

Temperature stability: ∆f/f < ±1×10–10 (+10 °C to +40 °C)

Storage temperature: –55 °C to +85 °C

Magnetic field: ∆f/f<2×10–10 (1Gauss field reversal)

Relative humidity: 95% (non-condensing)

General

AC power: 90 to 132VAC or 175 to 264VAC,  47 to 63Hz, 50W

Dimensions, weight: 8.5"×3.5"×13" (WHL), 9 lbs.

Option 03: Distribution amplifier (18 outputs)

Datasheet