Orolia MRO-50 Manual
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Orolia MRO-50 Manual

Miniature, ultra-portable high precision & performance atomic frequency source
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Miniature, Ultra-Portable
High Precision & Performance
Atomic Frequency Source

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Summary of Contents for Orolia MRO-50

  • Page 1 Miniature, Ultra-Portable High Precision & Performance Atomic Frequency Source...

  • Page 2: Table Of Contents

    Physics Package (patent pending)  Electronics Package  2.3.1 Atomic resonance signal capture  2.3.2 Temperature controllers  2.3.3 C-field  2.3.4 Telemetries  2.3.5 Frequency adjustment  The mRO-50 SPECIFICATIONS  mRO-50 installation and operation  Introduction  Safety!  Environmental Responsibility   Shipping and receiving information  Mounting  Pin Layout:  Normal operation ...

  • Page 3: Introduction

    Spectratime used its 25 years of experience in manufacturing ultra-stable Rubidium oscillator for ground and space applications to produce a miniaturized Rubidium Oscillator (mRO-50) with dimensions, packaging and pinout of crystal oscillators (OCXO), measuring 50.8 mm x 50.8 mm x 19.5 mm. It delivers a square reference signal at 10 MHz (0 to 3.3 V) with outstanding performances for a steady power consumption below 0.45 W at room temperature.
  • Page 4 Spectratime mRO-50 Spectratime mRO-50 The pump light comes from a VCSEL (Vertical Cavity Surface Emitting Laser) which is tuned to resonance with the transition between the ground-state F=3 level and the (un-resolved) excited states F’=2,3. The pump light excites 85Rb atoms which are in the upper hyperfine level (F=3) to the short-lived excited state 5P from which they decay to the two ground state levels (F=2,3) with equal probability.

  • Page 5: Physics Package (Patent Pending)

    Spectratime mRO-50 Physics Package (patent pending) The main design characteristics of the PP are its low power consumption, small size and mass, along with minimal environmental sensitivities and mechanical ruggedness. All parts of the PP are incorporated into a DIL-14 package hermetically sealed off under Xenon atmosphere to reduce temperature exchange by convection and minimize electrical power consumption.

  • Page 6: Temperature Controllers

    Spectratime mRO-50 Figure 4: Atomic resonance: error signal detection 2.3.2 Temperature controllers Since the temperature of the VCSEL and the Cell must be adjusted independently, two separated heaters are necessary to control the temperature of the PP main parts. The temperatures are controlled by compensating thermal losses using heating elements (no cooling).

  • Page 7: Frequency Adjustment

    The specifications of this product are available on our website www.spectratime.com. 4. mRO-50 installation and operation Introduction This chapter of the manual contains information regarding the installation and operation of the mRO-50. It is recommended to read this chapter carefully prior to operate the unit.

  • Page 8: Safety

    Should it be necessary to ship the unit back, the original case and packing should be used. If the original case is not available, a suitable container with foam-packing is recommended. CAUTION Care must be taken for the transportation of the mRO-50 to ensure that the maximum acceleration due to a shocks 50g/11ms is not exceeded. mRO-50 contains glass bulbs, crystal resonators.

  • Page 9: Mounting

    The general information for the mechanical interface of the mRO-50 unit is given in the package drawing Figure 6 (all dimensions in mm).

  • Page 10: Normal Operation

    Serial interface operation 4.8.1 Introduction The mRO-50 integrates a micro-controller with A/D and D/A embedded converters. The micro-controller is used to set the parameters of the clock but also to lock the TCXO on the Rb absorption ‘dip’. The built-in serial interface allows an automatic parameter adjustment during the manufacturing process as well as a fine and coarse adjustment of the center frequency.

  • Page 11: Mro-50 Parameters Monitoring

    4.8.3 mRO-50 parameters monitoring The parameters monitoring is readable through the serial interface and with the use of the single command ‘MONITOR1‘ followed by a carriage return character. The mRO-50 will respond to this command with an ASCII/HEX coded string as shown below.
  • Page 12 20 000 × X 298.15 × ln(10 ) + 4100 • (EEEE) Differential integrator DYNAMIC setting: after switch-on, the mRO-50 runs the process of locking the 4100 × 298.15 ( Ohm) = X = 1 − 3 × DEC(CCCC) 1000 T(°C) =...
  • Page 13 15: auto-start 0 = DISABLE | 1= ENABLE *always in state 0. IMPORTANT NOTE Commands may not be taken into account or the mRO-50 may return incorrect information during 200 ms maximum every 3 days due to an internal update of parameters.

  • Page 14: Center Frequency Adjustment

    The output frequency is adjustable digitally and by applying an analog voltage to pin #1. Analog voltage: must be low noise and stable to avoid any degradation of the performances of the mRO-50. This voltage is added to the voltage driving the current source of the coils. Spectratime recommends to place a buffer as close as possible of pin #1.

  • Page 15: Lock Monitor

    Spectratime mRO-50 4.9 Lock monitor LED device may be directly connected to the ‘\lock monitor output’ according to Figure 8. Figure 8: electronic scheme for LED \lock monitoring...
  • Page 16 07 June, 2020. Spectratime mRO-50 Manual Specifications subject to change sales@orolia.com or improvement without notice © 2020 Orolia...

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