The ptf 4210A Rubidium Frequency Standard is a unique solution for providing a highly stable, low phase noise, frequency reference for applications requiring atomic reference stability performance.
The instrument contains a high performance rubidium module, with an extended life design, and very low aging rate, with high quality OCXO o/p for low phase noise.
For even better long term stability the unit will accept a 1PPS input that can be derived from a reference such as caesium or GPS.
An ideal laboratory or system frequency reference, which includes a range of options are available to enhance the functionality of the unit.

• 10MHz Rubidium Frequency Reference
• 100kHz Capability (with MOPS option)
• 1PPS Disciplining Input (standard)
• Ultra Low Phase Noise (-130dBc at 10Hz)
• RS 232 Monitor/Control
• Convenient 2U bench or 19″ rack mount

Output Level (standard)
10MHz 0.5 vrms into 50Ω
1PPS 5 v CMOS ±20 mA sink/source

Output Level (w/MOPS Option)  
1MHz 1.0 vrms into 50Ω +13dBm ±1dBm
5MHz 1.0 vrms into 50Ω +13dBm ±1dBm
10MHz 1.0 vrms into 50Ω +13dBm ±1dBm
1PPS 4.2 v CMOS into 50Ω

1s 2E-11
10s 1E-11
100s 2E-12

Aging <5 E-11/month (after 30 days)
  <5 E-10/year

Accuracy 5E-11 (at shipment)

Phase Noise, 1Hz b/w,  
Offset from carrier Phase Noise (dBc)
10Hz -130
100Hz -140
Spurious -130 dBc (100kHz bw)
Power Requirements  
AC Input (±15%) 90 - 264 VAC, <10W
DC Input (optional)  
(HxWxD) 2U x 19” x 16”

Configuration Options  
Option # Description
PPSI External 1 PPS
EXP4 4 ch. Expansion Module
MOPS Multiple RF Outputs (1, 5 & 10MHz)
RF01 1MHz Sinewave out (x4)
RF05 5MHz Sinewave out (x4)
RF10 10MHz Sinewave out (x4)
PULS Pulse Distribution (x4)
OCXO High Performance OCXO
ULNO Ultra Low Noise Output
FPOC Front Panel Outputs
DCPS DC Power Supply
RSLD Mounted Rackslides