SR1 Audio Analyser

PERF10 Rackmount 10MHz rubidium atomic audio clock

PERF10 Rackmount 10MHz rubidium atomic audio clock
  • Atomic stability and accuracy
  • Eight 10 MHz, 75 Ω outputs
  • ±0.05 ppb accuracy
  • 10 year aging less than 5 ppb
  • Ultra-low phase noise (<-150 dBc/Hz @ 10 kHz)
  • Compatible with any device that accepts a 10 MHz input (including Antelope™ and dCS™ equipment)
  • Optional 12 VDC redundant power input with automatic switchover


Perfection is a high standard - but your studio clocks deserve nothing less. That's why SRS designed the PERF10, to offer audio professionals and demanding audiophiles a frequency reference of staggering accuracy and unmatched stability.

Up until now, atomic clocks marketed for audio use have been designed around commercial off-the-shelf rubidium clocks designed for the communications market-not audio. And while these rubidium clocks may have good long-term stability, they were never designed to provide low short-term jitter.

The PERF10 is built around Stanford Research Systems' own PRS10 rubidium oscillator. By designing and building the oscillators ourselves, we're able to craft an instrument perfectly matched to the demanding requirements of audio master clocks. Starting with an oven stabilized, 3rd overtone, varactor tuned, SC-cut crystal oscillator, the PERF10 offers both the accuracy and stability associated with rubidium clocks and unmatched jitter performance - 30 db better phase noise at 10 Hz off carrier than a competing "Swiss-made" rubidium clock.

And because we don't have to buy our oscillators from an outside source, we can offer you perfection - at an affordable price. PERF10 has eight 10 MHz, 75 Ω outputs compatible with all master clocks that accept a 10 MHz reference input.

Option 01 allows the unit to be powered from an external 12 VDC power source. When equipped with Option 01 PERF10 can be powered solely from an 12 VDC source, or the DC and AC power sources can be connected simultaneously with the DC supply providing an automatically switched redundant power source in the event of an AC failure.


Rubidium Oscillator
Accuracy at shipment ±0.05 ppb (±5 ×10-11)
Aging (after 30 days) <5 ×10-11 (monthly)
<5 ×10-10 (yearly)
5 ×10-9 (20 years, typ.)
Spurious harmonics <–60dBc
Phase noise (SSB) <–130dBc (10Hz)
<–140dBc (100Hz)
<–150dBc (1 kHz)
<–150 dBc (10kHz)
Short-term stability <2 ×10-11 (1 s)
(Allan variance) <1 ×10-11 (10s)
<2 ×10-12 (100 s)
Warm-up time <6 minutes (time to lock)
Number of outputs 8 (rear-panel BNCs)
Output impedance 75Ω
Output amplitude 1 Vpp (terminated in 75 Ω)
Environment +
Operating temperature +10°C to +40°C
Storage temperature –55°C to +85°C
Relative humidity 95% (non-condensing)
AC power 90 to 132VAC or 175 to 264VAC
47 to 63 Hz, 50W
DC power 12VDC, 54W (when equiped with Opt. 01)
Dimensions 19" × 3.5" × 10.125" (WHD)
Weight 10 lbs.
Warranty One year parts and labor on defects in materials and workmanship