PERF10 Rubidium Atomic Clock
Contents
1. the AC power The orange DC Power LEDs will glow when a DC power source is connected After about 6 minutes the Unlock LEDs will stop flashing and the purple Lock LEDs will turn on indicating that the units is ready for use Make sure that the front panel switch is in the On position and that the LEDs above the switch are glowing green indicating that the outputs are on Connecting to Audio Video Devices Once the Locked LEDs are on the PERF10 is ready to be connected to external audio video components Almost all commercial audio and video devices use 75Q interconnects for clock distribution To minimize reflections that can degrade clocking performance use quality 75 Q cable to connect the PERF10 outputs to up to the External Clock inputs of up to 8 audio video devices Keep cable lengths to a minimum when possible Note that different devices have different configuration requirements for connecting them to an external 10 MHz clock Consult the manual for each device individually to determine how to configure it to accept an external 10 MHz clock and verify that the device is locked to the PERF10 s output PERF 10 Rubidium Atomic Clock Using External 12 VDC Power PERF10 can be ordered with Option 01 which enables the unit to be powered from an external 12 VDC power source When equipped with Option 01 PERF10 can be powered by 12 VDC alone or the DC and AC power sources can be connected at the same time2. dBc Hz lt 150 dBc Hz lt 2 x 10 1s lt 1x 10 10s lt 2 x 1077 100s lt 6 minutes time to lock 10 Hz 100 Hz 1 kHz 10 kHz 8 BNC rear panel 750 1 Vpp terminated in 750 10 C to 40 C 55 C to 85 C lt 95 non condensing 90 to 132 VAC or 175 to 264 VAC 47 to 63 Hz 66W during initial warmup 25 W steady state 12 VDC 5 5 A during warmup 1 3 A steady state 19 x 3 5 x 10 125 8 Ibs One year parts and labor on defects in materials and workmanship PERF 10 Rubidium Atomic Clock
3. with the DC power providing redundant backup in case the AC power fails DC Power Requirements The external 12 VDC power supply should be capable of providing 5 5 amps of current during the rubidium oscillator s initial warm up period Note that this is beyond the capability of many typical small benchtop power supplies Do not connect the unit to a power supply not capable of providing the required current After warm up the current requirement drops to about 1 5 amps DC Power Connector The DC power connector on the rear of the unit is designed to accept a Neutrik speakON NL4FX connector The connector should be wired as follows speakON Pin Power Supply 1 12 VDC 2 Ground Return 1 Power Supply Chassis Earth Ground Make sure the power connector is wired properly Incorrect wiring of the power connector can result in permanent damage to the instrument PERF 0 Rubidium Atomic Clock 10 Specifications Rubidium Oscillator Accuracy at shipment Aging after 30 days Spurious Harmonics Phase noise SSB Short term stability Allan var Warm up time Outputs Number of Outputs Output Impedance Output Amplitude Environmental Operating Temperature Storage temperature Relative humidity General AC Power DC Power Dimensions Weight Warranty 0 05 ppb 5 x10 lt 5x 10 monthly lt 5 x 10 7 yearly lt 5 x 10 20 years typ lt 60 dBc lt 135 dBc Hz lt 145 dBc Hz lt 150
4. PERF1O Rubidium Atomic Clock Owner s Manual RS Stanford Research Svstems Audio Revision 1 0 Februarv 2011 Certification Stanford Research Systems certifies that this product met its published specifications at the time of shipment Stanford Research Systems further certifies that its calibration measurements are traceable to the United States National Institute of Standards and Technology NIST Warranty This Stanford Research Systems product is warranted against defects in materials and workmanship for a period of one 1 year from the date of shipment Service For warranty service or repair this product must be returned to a Stanford Research Systems authorized service facility Contact Stanford Research Systems or an authorized representative before returning this product for repair Information in this document is subject to change without notice Copyright Stanford Research Systems Inc 2011 All rights reserved Stanford Research Systems Inc 1290 D Reamwood Avenue Sunnyvale California 94089 Printed in USA PERF 10 Rubidium Atomic Clock Safety and Preparation for Use WARNING Dangerous voltages capable of causing injury or death are present in this instrument Use extreme caution whenever the instrument cover is removed Do not remove the cover while the unit is plugged in to a live outlet or to an external DC power supply Caution There are no user serviceable parts inside the instrument Do
5. ars will pick up the difference that comes from using the finest audio clock source available PERF 0 Rubidium Atomic Clock PERF10 Front Panel 10 MHz Rubidium Atomic Clock Lock SRS Stanford Research Systems Audio Output Switch This switch turns the 8 rear panel 10 MHz outputs on and off Note that this switch is not a power switch The PERF10 draws power from the AC or DC power source to power the rubidium oscillator regardless of the switch status Output Indicator This group of LEDs glows green when the outputs are on and red when the outputs are off AC Power indicator This group of LEDs glows green when the PERF10 is connected to AC Power The PERF10 requires 90 132 VAC or 175 to 264 VAC DC Power indicator On PERF10s equipped with Option 01 this group of LEDs glows orange when the unit is connected to a 12 VDC power source Unlock indicator This group of LEDs flashes yellow to indicate that the internal rubidium oscillator is heating up and that its internal phase lock loop is not yet locked It takes about 6 minutes for the unit to warm up and lock from a completely cold state Lock indicator When the unlock indicator stops flashing this group of purple LEDs will glow to indicate the rubidium oscillator is warmed up locked and the unit is ready for use PERF 10 Rubidium Atomic Clock PERF10 Rear Panel RS 232 Connector This connector is used to communicate with the internal rubidium oscillator It is only used
6. during calibration and is not necessary for normal use Advanced users who are interested will find the manual for the PRS10 rubidium oscillator along with its RS 232 command set at http www thinksrs com downloads PDFs Manuals PRS 10m pdf AC Power Connector Used to connect PERF10 to the AC mains PERF10 accommodates AC voltages from 90 132 VAC or 175 to 264 VAC without the need for any user configuration Chassis Ground Provides a convenient chassis ground reference point DC Power Connector On units equipped with Option 01 12 VDC power is provided to the instrument through this connector The connector is a Neutrik speakON NL4MP socket designed to accept a speakON NL4FX cable connector See the section on Using External 12 VDC Power for a wiring diagram On units without Option 01 this connector is replaced by a blank piece of aluminum Outputs l 8 75022 BNC connectors which carry the 10 MHz output Each output is a 10 MHz sine wave with an amplitude of 1 Vpp when terminated in 75 Q For best results use quality 75Q BNC cable to connect PERF10 to other devices and minimize the length of cable runs PERF 10 Rubidium Atomic Clock Operation Turning PERF10 On To turn the unit on connect it to an AC power source The AC Power LEDs will glow green and the Unlock LEDs will flash to indicate that the unit is warming up If the unit is equipped with Option 01 a 12 VDC power source can be connected along with or in place of
7. ic Clock Contents Safety and Preparation For Use Lena Contents i iss 1 1 1 1 1 1 1 1 10 A A ost 111 PERF10 Front Panel 1 PERF10 0000101 Operation 1 Using External 12 VIDE ini sse niece es jda NJPJEZON b Ke zi Ta L I PERFIO Rubidium Atomic Clock Introduction The Stanford Research Systems PERF10 Rubidium Atomic Clock is an ultra precise ultra stable 10 MHZ atomic master clock designed to provide a frequency reference to audio and video equipment Based on Stanford Research System s own PRS10 rubidium oscillator the PERF10 provides a clocking source accurate to a staggering 0 05 parts per billion at shipment with a yearly aging of only 0 5 ppb The PERF10 goes beyond just accuracy to bring you a clock source specifically designed to meet the demanding requirements of digital audio Most commercial rubidium oscillators are designed around inexpensive crystal oscillators they have good long term stability but poor phase noise close to carrier Only Stanford Research Systems PERF10 rubidium clock is designed around a precision oven stabilized varactor tuned SC cut crystal oscillator to bring you both accuracy and the low phase noise required for precision audio applications The PERF10 s phase noise at 10 Hz off carrier is 30 dB better than a competing Swiss made rubidium clock You won t need the spec sheet to tell the difference though your e
8. not attempt to service or adjust the instrument Refer all servicing to qualified factory personnel Do not allow the instrument to become wet Do not expose the instrument to rain or liquid spills In the event the instrument is exposed to moisture turn it off immediately and wait until it is completely dry before attempting to operate it Front Panel Switch The rocker switch on the front panel of the instrument is NOT a power switch it only controls the on off status of the outputs Power is drawn from the AC or DC power source to power the rubidium oscillator whenever the unit is connected to one of these sources External DC Power Supply Only units that are equipped with Option 01 can be operated from an external 12 VDC power source Units equipped with Option 01 can be identified by the Neutrik speakON connector on the rear panel Units without Option 01 have a blank piece of aluminum in place of the connector Be sure the external 12 VDC connector is wired in accordance with the diagram given in this manual Damage to the instrument may result if external 12 VDC is improperly applied Be sure the external 12 VDC power supply used to power the instrument when equipped with Option 01 is rated for the required current The external supply needs to source 5 5A at 12VDC during the initial warm up period No Radioactive Components The Rubidium atomic oscillator used in PERF10 contains no radioactive components PERF 10 Rubidium Atom
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