Novatech 1450B Manuel utilisateur

NOVATECHINSTRUMENTS 1 1450B Manual, 3-Aug-2015

INSTRUMENTS

Model 1450B

Disciplined Rubidium FrequencyStandard

Section Page Contents

1.0. . . . . . . . . . . . . . . . . . . . . . . . . . .. . 2. . . . . . . . . . . . . . . . . . . . . . . . . Description

2.0. . . . . . . . . . . . . . . . . . . . . . . . . . .. . 2. . . . . . . . . . . . . . . . . . . . . . . Specifications

3.0. . . . . . . . . . . . . . . . . . . . . . . . . . .. . 3. . . . . . . . . . . . . . . . . . . . . . . . . .Installation

4.0. . . . . . . . . . . . . . . . . . . . . . . . . . .. . 3. . . . . . . . . . . . . . . . . . . . . . . . . . .Operation

5.0. . . . . . . . . . . . . . . . . . . . . . . . . . .. . 3. . . . . . . . . . . . . . . . . . . . . . 1pps Operation

6.0. . . . . . . . . . . . . . . . . . . . . . . . . . .. . 4. . . . . . . PerformanceTest and Calibration

7.0. . . . . . . . . . . . . . . . . . . . . . . . . . .. . 6. . . . . . . . . . . . . . . . . . . . . . . . . . .Warranty

NOVATECHINSTRUMENTS 2 1450B Manual, 3-Aug-2015

1.0 DESCRIPTION

1.1 The Model 1450B is arubidium frequency stan-

dard which can be disciplined toan external1pps

(one pulse persecond) referencesignal. This1pps is

commonly derived from primary, or otherstandards,

such as GPS(global positioning satellite).When dis-

ciplinedto 1pps, the1450B providesprimary stan-

dard accuracyand stability.

1.2 The1450B provides onefixedfrequencysine

wave output of 10MHz and up to 8additional auxil-

iary outputsthat can be fixed sine or TTL or synthe-

sized sine orTTL. The 1450B is particularly useful

in applications which requirenon-standard or cus-

tomerspecifiedfrequencies. The auxiliary outputs

arelocked to the internalrubidium oscillator.

1.3 The most recentversion of this manualcan be

found on Novatech Instruments, Inc. web site.

2.0 SPECIFICATIONS

2.1 FREQUENCYSTABILITY (∆f/f, Typical)

ShortTerm: t=1s <3x10-11

t=10s <1x10-11

t=100s <3x10-12

Aging: Monthly <±5x10-11 after1 month

Yearly <±5x10-10 after3 months

Holdover (24Hours, ±2oC):<±1x10-11 (<±1µs after

>10x 1pps tracking time constant)

Temperature:+5 to +45oC <±1x10-10

Line Voltage:±10% <±5x10-12

2.2 FREQUENCYACCURACY

At shipment: <=±5x10-11 at 20oC.

Retrace: <=±5x10-11 from last frequency after

1hour ON and 24hours OFF (constant environment).

2.3 FIXEDSINEWAVE OUTPUTS

10MHz, 1VRMS ±0.25VRMS into 50Ω.

2.4 SYNTHESIZEDSINEWAVE OUTPUT

Frequencyprogrammable from 100Hz to 50MHz in

0.1Hz steps.

Amplitude: 1VRMS±0.25VRMS at10MHz into 50Ω

(±3dB from100Hz to 50MHz,referencedto

10MHz).

Phase Noise: Typical, <-140dBc,10kHz offset,

1MHz output.

Harmonics: Typical <-45dBc, spurious: <-55dBc.

2.5 SPECTRAL PURITY (10MHzfixed output,

typical)

Harmonic<-25dBc.

Spurious/Non-Harmonic/Sub-Harmonic: <-45dBc.

2.6 PHASE NOISE (Typical, 10MHz output, 50Ω)

Frequency Offset dBc

1Hz -70

10Hz -90

100Hz -120

1kHz -140

10kHz -140

2.7 1pps IN and OUT

1pps IN:DC-coupled, acceptsTTL or CMOS. 1pps

OUT: TTL, 133µsnegativepulse width. Typical

outputjitter: 20ns peak-peak (1minute measure-

ment time).

2.8 ENVIRONMENTAL

Temperature:+0oC to +50oC operating.

Humidity: 80% to 31oC, decreasing linearlyto

50% at 40oC.

2.9 SIZE

3.47” H, 16.73”W, 12.0” D, standard 19” rack.

2.10 CONNECTORS

BNCson rearpanelforfixed10MHz sine output

1pps input, 1pps outputand eight auxiliary outputs.

2.11 LINE POWER

120/240VAC±10%,50/60Hz.30VA (50VAmax

during warmup <20minutes). (internal linevoltage

switch)

2.12 FRONT PANELINDICATORS

POWER OK: AC power is applied and on.

RUBIDIUM LOCK:Green:Oscillatoris locked.

Red: Warm-up.

1 PPS LOCK: Locked to and tracking a 1pps input.

NOVATECHINSTRUMENTS 3 1450B Manual, 3-Aug-2015

2.13 ACCESSORY

GPS1: Matching GPSsmartantenna system.

3.0 INSTALLATION

WARNING:

The 1450B line power input receptacleis provided

with a 3-wirecord. Do not defeat the grounded

conductor.

3.1 PowerConnection. Verifythat therearpanel

indicates your line power(120VAC or 240VAC

50Hz/60Hz). Connect theprovided 3-wireline cord

to your powersource. The power switchis built-in

to theinput moduleon the rearpanel. Linevoltage is

selected by an internalswitch and set at the factory.

3.2 1450BInstallation. The1450Brequires no user

setup beyond the application of line powerand con-

nection to your application. Connect your 50Ωcoax-

ial cables to theappropriate frontpanelBNC. See

below for1pps connections and use.

NOTE:

If you plan to use your 1450B as part of a

calibration systemor house standard, it is suggested

that it be powered from an uninterruptable power

supply(UPS) (along with your 1pps source, if used).

4.0 OPERATION

4.1 Poweron. Afterpower isapplied, the1450B

POWEROK LED will illuminate green. This indi-

catesthat the applied linepower is within tolerance

and the unit isfunctioning.

4.2 Rubidium Warm-up. Afterpoweris applied,

the 1450B willtakeup to 20 minutes to reach

Rubidium Lock. DuringRubidium warm-up time,

the frontpanel LED labelled RUBIDIUM LOCK

willilluminatered. Whenthe lock has been

achieved (∆f/f<±1x10-8), this LEDwillilluminate

green. This function is independent of 1pps tracking.

NOTE:

During the Rubidium locking process, thefront

panel RUBIDIUM LOCK LED may switchbetween

red and green. A steady green indicates LOCK.

4.3 Proper operation in stand-alone mode, without

a1pps connection, is indicated by agreen POWER

OK LED and agreen RUBIDIUM LOCK LED.

The 1pps LED will remain off.

NOTE:

The 1450B willmeet the specified accuracywithin a

fewhours after power-up. For applications

requiring verification of long-term stability, the

periods shown in the specifications will haveto be

met.

4.4 See thesection “1pps Operation,”below, for

details on 1pps connections and operation.

5.0 1pps OPERATION

5.1 1ppsIn andOut. The 1450B is equipped with

rear panel BNC receptacleswhich accept a1pps

inputand provide a1pps output. Use of 1pps allows

synchronization of multiple1450B, aswellas pro-

viding ameans of auto-calibration.

5.2 The1450B will accept along-termstable1pps

signal, typically derivedfrom aGPS(global posi-

tioning system)receiverorfrom anotherfrequency

standard.It will auto-adapt to the supplied 1pps and

adjust theinternal Rubidium Oscillator to match the

long term average frequency derivedfrom the1pps.

The auto-adaptivealgorithm selects thebest tuning

timeconstant based upon thestability of your sup-

plied 1pps.

5.3 For low-jitter 1pps inputs (<20ns),the approxi-

mate tuning time constant will be 1,000 seconds.A

typical timing receiver system, such as theGPS1

(with approximately 100ns peak-peak1pps jitter),

requires atimeconstant of approximately 10,000

seconds (about 3 hours) foroptimum tracking.

5.4 For noisier1pps inputs,thetime constant may

increase to 100,000 seconds. Ifthe input istoo

noisy, the 1 PPSLOCK light willnot illuminate.

NOVATECHINSTRUMENTS 4 1450B Manual, 3-Aug-2015

5.5 Proper operation whentracking a1pps signalis

indicated by allthree front panel LEDs illuminated

green.

NOTE:

Due to theselong time constants necessary to track

a 1pps input, temperature variationscan cause

fluctuations in the relative phase of the 10MHz

output and the 1pps output.

NOTE:

The ∆f/f tracking range of the internal Rubidium

oscillatoris approximately ±1x10-8. Ifyour 1pps

sourceis in error, but within theselimits, the 1450B

will adjust to your source.This allows multiple units

to be synchronized even in theabsenceofan abso-

lute reference.

NOTE:

The auto-adaptive frequency adjustment has a

resolution of ±5.12x10-13.

CAUTION:

Do notconnect the 1pps input and1pps outputon an

instrumenttogether. Thiswillforcetheinstrument to

tracka moving value and reach its adjustment limit.

5.6 The 1450B is configuredforautomatic self-cali-

bration. Whencontinuously connected to astable

1pps source, itwillauto-save thedisciplined fre-

quency value into non-volatile calibration memory

every24 hours. The last-saved valuewillbe used at

next power on or when 1pps islost. The1pps output

of acalibrated and tracking 1450Bhas lowerjitter

than atypical GPSreceiver makingitsuitablefor

use as amaster oscillator forfurther1pps systems.

6.0 PERFORMANCETEST&

CALIBRATION

6.1 The performance testdetailedbelow verifies

that the1450Baccuracyisequal to theaccuracy

achieved immediately aftercalibration. Prior to per-

forming this testit is recommended thatthe1450B

be calibrated.

NOTE:

Thereareno periodic user adjustments requiredfor

operation of the 1450B. When necessary, calibra-

tion should be performed “closed-case” using an

external 1pps source.

NOTE:

The unit under test orcalibration mustremain

undisturbedduring the calibration period. Changes

in environmental conditions(temperature, electric

field, magneticfield or physicalorientation) affect

the calibration. If possible, calibration should be

performed atthe application site.

6.2 Calibration: Calibration of the 1450B should

be performed “closed-case”using an external 1pps

source.Closed-case calibration is obtained by con-

necting the 1450B 1pps input toaknownstableand

accurate(betterthan 1 x10^11) 1pps source.Verify

that the three front panel LEDsareallilluminated

green. Astable 1pps source will allow this illumina-

tion within15 minutesafter connection. Leave the

unittracking the1pps external signalin astable

environment for aminimum of 5days. During this

timethe internal auto-adaptive algorithm will mea-

sure and qualify the1pps source, adjustingthe fre-

quencyto thelong term average ofthe 1pps source.

Whencontinuouslyconnected to astable 1pps

source,the 1450Bwill auto-save the disciplinedfre-

quencyvalue into non-volatile calibration memory

every 24 hours.

NOTE:

Calibration and verification ofthefrequencyand

frequency stability of the 1450B requires a

laboratoryenvironmentof 23oC ±3oC.

NOVATECHINSTRUMENTS 5 1450B Manual, 3-Aug-2015

6.3 See Table 3for alist of recommendedtest

equipment toperformthefollowing measurements.

6.4 Verify Frequency Accuracy. To verify the fre-

quency ofthe1450B,setthefrequency counterto

display12-digits of resolution. Thefrequency

countermust usean external time baseof accuracy

better than ±1x10-11.

6.5 Verifythat the frequency and amplitude of the

fixed 10MHz sinewave outputis within thetoler-

ancesas shown inTable 4. Allowthecounter to

averageseveral readings.Acountertimeconstant

of 1000seconds or longer is recommended. The

error limits shown do not include timebaseor

countererrors.

6.6 Amplitude Verification. Establish ameasure-

ment function of Volts RMS on theoscilloscope.

Connect a50Ωcoaxialcablefrom the1450Btothe

oscilloscope (set to 50Ωtermination) Verify an

amplitudeof 1.0Vrms±0.25Vrms on the fixed

10MHz sine wave output.

6.7 To verify the Auxiliary output signals seethe

option addendum for eachspecific1450B configu-

ration..

6.8 This concludestheverification test of the

1450B.

Table3:Recommended Test Equipment

Item Minimum

Specification Recommended

Oscilloscope 300MHz,50Ω

termination Tektronix

TDS3032B

Frequency

Counter 100MHz,12-

digits. HP53132A

Counter Time

Base <±1x10-11 Novatech

Instruments, Inc.

Model2965AR

with GPS1smart

antenna.

Table4: Frequency TestPoints

Frequency ∆f Voltage Tolerance

10MHz ±500µHz 1.0Vrms±0.25Vrms

NOVATECHINSTRUMENTS 6 1450B Manual, 3-Aug-2015

WARRANTY

NOVATECH INSTRUMENTSwarrantsthatallinstruments itmanufacturesarefreefrom defectsin

materialand workmanshipand agrees to replaceor repair any instrument found defective during a period

of oneyearfrom date ofshipment to original purchaser.

This warrantyis limited toreplacing orrepairing defectiveinstrumentsthat have been returnedby

purchaser,at thepurchaser's expense, to NOVATECH INSTRUMENTSand thathavenot been

subjectedto misuse,neglect, improper installation, repair alteration oraccident. NOVATECH

INSTRUMENTS shall have the sole right to final determination regarding the existenceand causeof a

defect.

This warranty is in lieu of any other warranty, either expressed or implied, including but not limited to

any warranty of merchantability orfitness foraparticular purpose. Inno eventshall seller beliable for

collateral or consequential damages. Some states do not allowlimitations or exclusion ofconsequential

damages so this limitation may not apply to you.

All instrumentsmanufacturedby NOVATECH INSTRUMENTS should be inspectedas soon as they are

receivedby the purchaser.If an instrument is damaged inshipment the purchasershould immediately file

aclaim withthetransportation company. Any instrumentreturnedtoNOVATECH INSTRUMENTS

should be shipped in its originalshipping containeror otherrigidcontainerand supportedwith adequate

shock absorbing material.

This warranty constitutesthe full understanding between NOVATECH INSTRUMENTSand the

purchaserand no agreement extending or modifying itwillbebinding on NOVATECH

INSTRUMENTS unlessmade in writing and signed by anauthorized official ofNOVATECH

INSTRUMENTS

NOVATECH INSTRUMENTS

UnitedStates ofAmerica

FAX:206.629.4677

TEL:206.301.8986

http://www.novatechinstruments.com/

sales@novatechinstruments.com

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