◊ Frequency Accuracy : ≤2E-12
◊ 1PPS Accuracy: ≤100ns RMS, 30ns typical
◊ Outputs: 2x10MHz, 7x 1PPS (1xTTL, 1xPTTI, 5xRS-422), 2x1KPPS (RS-422), 1x100KPPS (RS-422)
◊ TOD Outputs: 1xIRIG B, 5xReshef,1xHave Quick
◊ IRIG-B Reader (option)
◊ Disciplined to GPS or Ext 1PPS.
◊ Communication:RS-232, RS-422, MIL-STD-1553 (opt.)
◊ Operating Temperature: -40°C to +71°C
◊ Holdover (without GPS): 1µs/24 hours, 5E-11/month
◊ 1 hour rechargeable battery back-up
◊  Power remote control
◊ Supply Voltage: 22-32 VDC per MIL-STD-704A
◊ Full MIL-STD qualification for military airborne and seaborne applications

The AR51A-08 offers militarized Rubidium Atomic Clocks, which is synchronized to the Global Positioning System (GPS), thereby providing extremely accurate time & frequency.
The AR51A-08 incorporates numerous features into a single box, including a Rubidium Standard, an internal GPS receiver a Rubidium-GPS DPLL (disciplining) circuit, time codes, multiple outputs. The Rubidium clock is phase locked to the GPS or other external inputs (as a back-up to GPS system). All outputs are derived from the Rubidium clock which maintains time and frequency when GPS or other inputs are interrupted.
The AR51A-08 has been fully qualified for operation in harsh stressed environments on ground mobile, airborne, fighter aircraft, Helicopter and ship borne platforms.

◊ Communication
◊ Telemetry test fields
◊ Field calibration