Check the listing for details. Efratom FRS-C 10MHz Rubidium Atomic Oscillator Frequency Standard. Condition: Used. Listed at 274.99 USD. Efratom FRS-C 10 MHz Rubidium Frequency Reference Comes with what you see in the pictures. If you don't see it, you probably wont get it. Specifications are from Ball/Efratom and may vary slightly due to upgrades, revisions or options this unit may or may not have. Quantity available, only 1 sold in auction. It does come with an Operation and Maintenance Manual (for the standard only). We believe the 2 boards with this unit are a distribution amplifier. We have sold several of these with no complaints but we did have 1 customer who said this unit has a square wave output and not a sine wave. The specifications listed below are directly out of the manual from Efratom so I am not sure. Rubidium Standard Information: Part Number: 100334-004 Board 1: 55761ASSY101874-002 Rev B 55761-101886-001 Rev A Pc 1 94V-0 Board 2: 55761ASSY101720-002 Rev 4 55761-101719-001 Rev E Casing the Unit Goes in: ASSY 101707-001 Introduction: The Efratom Model FRS Rubidium Standard is a subminiature, atomic resonance-controlled oscillator which provides an extremely pure and stable sinusoidal signal of 10 MHz at 0.5 Vrms into a 50 ohm load. The FRS-C may be utilized in equipment requiring an extremely stable and precise frequency and under more benign environmental conditions such as the time base of frequency counters. Connections: All necessary connections for input and output signals are externally accessible. Output signal, power, frequency adjustment, and built-in-test (BIT) functions are provided by a Cannon connector which mates with Cannon P/N DAM11WIS. Features: For Time Base Applications For Use in Instruments, Receivers, Test Equipment, and Networks Small Package Low Power Consumption Electrical Specifications: Output: 10 MHz Sine Wave, 0.5 ±30/10 % Vrms into 50 Ohm, set to 10 MHz ±5x10-11 from factory. Input Power: After warm-up, 10 W at 24 VDC at 25 °C ambient. Reg. Pwr.: 22 to 30 VDC, (< 350 mA) Htr. Pwr.: 22 to 30 VDC, (1.7A max during warm-up) Warm-Up Characteristics: < or = to 4 min. to reach 1x10-9 at +25 °C ambient. Long-term Drift: < or = to 5x10-11/mo*, < or = 5x10-10/first year, < or = to 2x10-10/year thereafter. 1-Day Stability: 4x10-11/day** Short-term Stability: oy(t)= < or = to 1x10-10 t-1/2;; for 1s < or = to t < or = to 100s Frequency Accuracy: 1x10-9/yr Phase Noise (SSB 1 Hz BW): -65 dB at 1 Hz, -110 dB at 100 Hz, -125 dB at 1 KHz Harmonic/Non-Harmonic: -40 dB (sine wave) / -70 dB Trim Range: ±2x10-9 max. Retrace: ±2x10-11 Magnetic Field: < or = to 4x10-13 / am-1 (< or = to 3x10-11 / 0.1 milliTesla) Voltage Variation: < or = to 2x10-11 for ±10% input voltage change Electrical Protection: An internal diode and fuse protects against reverse-polarity connection. Output is short-circuit protected. Environmental Specifications: Operating Temperature: < or = to 3x10-10 from -5 °C to 55 °C Amb. (65 °C max baseplate) Storage Temperature: -55 °C to 75 °C Overall Environment Effects (Altitude, Vibration, Shock): Meets or exceeds MIL-T-28800B for Type III, Class 5 equipment. Humidity: < or = to 95% RH Physical Specifications (Just oscillator, not boards. Does not include shipping.): Size: 2" x 3" x 4" (50 x 75 x 100 mm) Weight: < or = to 1.2 lbs (0.55 kg) Baseplate Threads (std): 4-40 * After 1 month of continuous operation. ** After 1 hour stabilization and operated within (25 ±3) °C ambient temperature. For Domestic Customers: Packaging, handling, and order processing included in shipping in all domestic shipments as quoted by the shipping calculator. For International Customers there is a $5.00 minimum for packaging, handling, and order processing. International shipping to be determined by destination. Prior to shipment I will need to know the following information (filled out on a form that I will send you) for International Customers or Packages/Freight being Forwarded internationally. International customers may also be subject to a freight forwarder form if applicable.: (1) Are you the end-user of this item? (2) If you are not the ultimate end-user of the item, please state the ultimate end user's name. (3) What is the ultimate country destination? 05/14/04