Novatech 2910A Manuale utente

SECTION 1 - INTRODUCTION AND the position of the underline cursor. The Menu

SPECIFICATIONS pushbuttoncyclesthedisplaythroughsevenmenus

and then back to the Frequencyand Amplitude

1.0 TheModel 2910ADirectDigital Synthesizeris Display.TheSelectpushbuttonmovestheunderline

packagedin a bench-top enclosureand bas an cursoronedigit eachtime it is depressed.H it is

adjustableoutputsinewavefrequencyfrom 1JJHzto depressedandheld, thenthe cursorcan be moved

12MHz andan adjustableoutputclock frequency with therotaryknob. Whena menuis presentthe

from 1~ to 48 MHz. Thedisplayshowsoutput selectbuttonstepsthroughthechoicesin eachmenu.

frequencyandamplitudesimultaneously.

The 2910A bastwo front panelBNC connectors.

One provides a sinewave output and the other

providesa clock outputthat is menuselectablefor

either CMOStrrL or ECL. Thereis a rearpanel

BNC thataccep~anexternalstandardinputof 1or2

MHz.

1.1Twopushbuttonsandonerotary knob provide

manualcontrol of theinstrument. Therotaryknob

changeseitherfrequencyoramplitudedependingon

NOVATECH INSTRUMENTS, INC.

2910ARearView

1.2 The back lit Liquid Crystal Display (LCD)

showsboth frequencyin MHz and amplitude in

Volts. Thefrequencydisplayhaselevendigitsanda

stepsizeof 1mHz. The voltagedisplayhasthree

digitsanda stepsizeof 0.01V up to 1V and0.1V

above1V. After themenubuttonis depressed,the

display shows the menu name and the current

selection.

22910AINSTRUcriON MANUAL R~1'2.0

1.3Specifications 18

Output CM~ 08Ip8t

SINE:0.001Hzto 12MHL CMOS outputwiDdriveCMosfm.. levelsinto loids >:JOO

11Dilitl wbeasetfromfront panel,lmlliest step0.001Hz. ohms.ECLoutput, wbeDtermiDMed.il ECL IOK::COIapeIibIe.

14Dilitl wbeDsetvi. EIA232,ImaUeItI8ep0.(XMm1Hz. CMOSor BCLmodeselectedfromdisplaymelaU(ft'compurer

iDIerfICe.

'rnXMOS/ECL: 0.001Hzto48MHz.

II Digiti whensetfrom frontpanel.smaJJeItI8ep0.001Hz. Rile/FaUTime: <1~.

14Dilitl whensetviaEIA232,KIn-lleststep0.~1 Hz. Ji~ <0.2..,of periodor 200pi wbidIever is~

«I2MHz).

Output Amplitucle Jiner: d.., of periodor 2ns~ illJe*t: (>12NRz).

SINE: 0.01to 10Vppintoopencircuit(MIftbil_.1O ~),

Resolutionis0.01V belowIV, O.I V ~ IV. ~ I mV max AmpIitIKIe1baI8ti~: < 2OCJI.

DCoffset. Accuncy is:t IdB. Symmetry:~ :t I~.

1i1XMOS/ECL: FixedamplitUde,$O'IJ:t 10..,DutyCydc. Setdu.11me

Meets8PIX'..-jatelevelspecificationiDIo~ circuit. Eo.. Frequency:<0.001'" in 100~ (setupdelayexduded).

requiresexternalterminationto ECL levels. AmptibJde:<1" in 100ms.

F;-~7 StabiHtJ Output I8pedaDa

10ppm,I year,20-30C. 50Ohms:t 2.." femaleBNCtK)CbSipalud CMOSIBCL

If anextemalfrequencystandardis COIIIIecfedtothe291M OpeaEmitterEa. ~ requirestamiution toECL levels.

external~t thenstabilityis equalto thatof theeXtaDII BNClbell is d8sil COIDIDOD.

stand.-d. ..,..,

Freq..-y Accur8CJ' Two ODeby sixteencb8r8CterblctJit liquid crystll display.

:t 5wm of displayedvaJue,20-30c.24tKMIrI. FrequcncyandampObJdeof siDeoutputdisplayed

Accuracyof 0.001ppmis~hievabJe.. simultaneously.ProvidesmenuforinsttumentaecupIIId

frequencystandard. conb'ol.

Power k-.lSt8Dd8I'd

100,120tX'230VAC:t I~, ~ 28VA Re8I'plDelBNCinputKCeptseitherI or2MHz~2ppn~

- exterDalItandard.Voltapsfrom2ronV to4:VnaswiD

PbJ*8I lockandpull internalRferela toeXterDaJItaIId8d.

2.6"H,7.3"W.9.5"L,excludingbai1111dfeet

5.21bs NOD.V_. MemOl'7

Last power-up staterer.ined in memory for 24 ~.

Pb8eNoile

<-110dBc,100HzOffsec.10Hzto 12MHz 1IA231c..pacer laterface

<-9SdBc. 10HzOffset, 10Hz to 12MHz RearpanelRiDepinfemaleD-COImecttX'IeriaI iDputallows

settingaU~ons. BaudRateisPOll'8llmabie~ 300to

S8ewaft Purity 9600bIudfromfrontpanelmalu. Onceremote~.- is

F~~ Harmonics SDiaimu selected,frontpaneldisplayandCOnb'olwe disabled.

.01-I~z <-6~c <-75dBc

.1-IMHz <-65d& <-7(ktBc OVENmClLLATOR

l-SMHz <-4SdBc <~ NOVATECHINSTRUMENTSINC.Model295OAs.i8I.

5-IOMHz <-3~c <-55dBc QuartzFrequencyStaIM18rdisAvIiJible. COIIJIIIt~.

>lOMHz <-3<kmc <-35dBc

MeasIndiaaftequencyrangeexteadiDItolOxtestfJ8q.-cy.

P\Iritydep.de5 belowI Hz. ~ -c "'

!.~"'::

)

NOVATECH INSTRUMENTS, 1Nc. 32910AINSTRUCTION MANUAL Rn 1..0

SEC110N2. OPERA11NGIN~1

2.0 latroducdon. This sectionof the manual

containsinfonnationaboutconnectingand~rating

the 2910A and shouldbe readcompletelybefore

usingtheins~L

WARNING

This P'048Ct Is "08 4 t.'086h t..

groundila6colld1leto,0/ fA. pow., ,ourc..

B./o,. conn.ctln, Gn,thln6 to th.

1M"." , besun to plII6 fA. pow'" cord

illto GP"'Pf'rl' wind pow,., nt"qlieGl t1I4Ils

COIIIImMtoGhl6h tlUJIlitJ.nil f"HII'd. It is

.«.,rsGI'J to 6rQund lb. in.r~1It ill this

WGJia ord,., to GPoid ~l«trlcGl liock Gad

Gaun 118/.OJHr8tiD&

NOTE

TheBNCOIItputshUldi.r,~*d.

2.1 Input r~. lk 2910Ais factorywiled to

operatefrom 100.120or 230%10'*'Volts AC. 60

Hz. Verify thatthecorrectpowerisavailablebefore

pluggingin thei~nt.

2.2 F1* RepI8CeI:;:~t.The29lOAisprotectedby

two It line input fusesthatarelocatedon theleft

portion of the power receptical. Use a small

screwdriver to apply pressureat the side of the

fusebolderandthefusebolderwill snapout.

WARNING

n~ 2910.4..",rt H dLrcoftft«/Mfro. u..

pow~r b~/or~ att~mptill' to nplae~ t"~ /run.

CAUDON

Forfire protection. replacethefuse'sonly with

slowfuse raledfor 250Vand0.25Qnlpe'ns.

NOVA.TECH INSTR UMBNT5, INC.

NOTE

EitMr 5x2Ommor 1/4"x 11/4 ..fuses

WID)'H ue4 5x 2(),u,aan NCDWlllleMe4

2.3 Local(FnJIItPaaeI)OperatiolL ThefollowiDl

procedureshould be used to operatethe 2910A

DirectDigital Synthesizerfromthefront panel.

a) C..=-::.~~~ 2910A to AC 1iDeJX)wef.

b) Connectthe lpp11:Jpriatecoaxial cablesto the

BNCoutputCOImeCtorsonthe2910Afrontpanel.

NOTE

1M outputampl;~ can varyfrom theoutput

uttiIIg whIII""illg long CdblelengthsIUIlu.rthe

c4bl~ ;.f t.""i1l4t~d witII 4 50 oil". load.

NOVATECH reco".".~nd.f ""ing a 50 Oil".

Terminator. When u.fing a terminator the

displayshowstwice the ampli~ deliveredto

tJlllood.

c) Turn 011the 2910A by depessiDathe power

switchlocatedontherearpaneljust abovethepower

cord input pl. andwait approximately7 seconds

whiledie2910Aperforms. selftest. The display

duringselftest.

NOTE

... 291OA

1MJInt isusedit will besetup

tim~

with iu de/GIIlIs~gs of J.(XX)MHz and J.OO

Vpp DC aft,.r the self t,.st is completed. T1ae

defaldtmill.. .reningsareshownin Table J. T1ae

29J0.4..,. CmlbechGngedusingthe~ and

selectPIU1I bIInMS. M~,." s~l«tioru 4. 5. and 6

affect theoperatioraof the instrument and should

hI set appropriately prior to operating the

29J0.4Wlr locGlcOfllrol.

2tltA INSTRUcnON MANUAL an 1.8

BIUd Rate

f.dK)

UK( I/F

Square.ave

Powa'Up

ExternalStaDdlld

HighFrequency

NOVATECH INSTRUMENTS, INC.

TABLE 1

MENUSE1TINGS

2910A

DEFAULT

9600

CHOICFS

SerialBIIM!Rateof ~. 4800.2400.

1200.60001'300

R8DmIe f.clX) OIl orOff

L«aI CcxIIIO1or~ C~ter Cootrol

CM~ CX'ECLLevels

DefaultSettin,sor SaveLastSettings

Disabled,1MHz. 2MHz

011

LocalCCXlbOl

CMOSrnL

Default

Disabled

High FI'equefK:YDisabled or Enabled

(Sineoutputis2~~ of displayedvalueabove

12MHz whenHighfreq~IK:Y isenabled)

5MANUAL Re92.1

Z910A~ucnON

d) Pushthe menubutton four timesto recall the

SquareWave Levels menu. The first threemenu

selectionsdo nO(affectmanualoperation.Pushthe

selectbuttonto rccall "ECL" if youplanto connect

thesquarewaveoutputtoanECLcircuit. Leavethe

selectionon"CMOsrm.. " if youarenotplanningto

connectto anEo.. circuit.

CAU110N

TheECL output is an openemineroutputand

mustbe terminatedto ECL leveu,nonnaUy50

ohmsto -2 Vor 510ohmsto -5.2. SelectingECL

outputmodewhileconnectedtoa 1TLor CMOS

circuit nulydanulgetheuser'scircuit, the291OA

or both.

e) Pushthemenubuttonagainto recallthePower

Up Mode Menu. Pushtheselectbuttonto display

the"SaveSettings"selectionif youwantthe2910A

tosaveall currentdisplayandmenusettingsafterthe

power is turnedoff and then backon. Leavethe

selectionon "UseDefaults"if youpreferthedefault

settingsshownin TableI tobesetafterthepoweris

turned off and then back 00.

f) Pushthe menu button again to recall the External

StandardsMenu. Push the select button to display

either 1MHz or 2 MHz if you planto Jockthe 2910A

to anexternal 1MHz or 2 MHz frequency standard.

Leave the selectionon Disabled if you do not plan to

lock the 2910A to anexternal standard.

g) Pushthemenubuttonagainto displaytheHigh

Frequencymenu. Pushtheselectbuttonandtoggle

to display to either enabledand di5abled. When

enabledisselectedtheCMOS/ECLoutputcangoto

48 MHz. Howeverwhenin theenabledmodeand

displaying over 12 MHz the sinewave output

frequencyis2S%of thedisplayedvalue.

NOVATECH INSTRUMENTS. 1Nc.

NOTE

For optimumsinewavepurity disable the High

Frequencymodewhennotneeded.

h) Pushthemenubuttonagaintorecallthefiequency

andamplitudesettingto thedisplay. Setthedesired

frequencyandamplitudeusingtherotaryknobandthe

selectbutton.Theselectbuttonadvancestheunderline

cursorandtheknobchangesthevalue. Pushingand

holdingtheselectbuttonenablestheknobtomovethe

cursorin bothdirections.

NOTE

It ispo..fsibletoadjustthecontrastonthe2910A

displaywitha.fmaUinsulatedadjustmenttooLAn

acce..fSholeislocatedontherearpaneljust above

theNOVATECHlogo.

2.4 Remote (Emmal Computer or Terminal)

Operatloa Thefollowing procedureshouldbeusedto

operatethe2910ADirect Digital Synthesizerfrom a

remotecomputerortemlinal.

a) Connectacablebetweenthe2910Aandtheserial

portof acomputeror terminal. OnmostPCsCOM1:

istheserialport.

NOTE

Theserialcableshouldbeastraightthrough9pin

cablewith a malecommontypeconnectoron the

endthatplugs into the 2910A.Only Rot.Tx and

GND are lUed.

b) Setupthecomputeror tern1ina1soit uses8databits.

I stop bit and no parity. Set the Baud rate on the

computeror tenninalat anydesiredratebetween300

Baudand9600Baud.

c) Perfonnthesetupoperationsfor Local Operation

asdescribedin paragraphs2.3 a)throughg).

62910AINSTRUCTION MANUAL KeY1.0

NOVATECH INSTRUMENTS, INC.

29tOAINSTRUcrJON MANUAL ReY2.8

d) Pushthe~nu oononuntil youhaverecalJedthe

Echo Menu. Push the select button to toggle

betweenEcl1OON and&00 OFFasdesired.EcOO

ON is DOI1Dallydesirable wIleD UsiD, . dumb

tenninal,butisnotcommonlyusedwith PC..

e) Pushthe ~U Ixmon againto recall theB8xi

Rate IMnu. Pushthe selectbutton to selectthe

desirMBaudrateto matchthecomputcrsetup.

f) Pushthe ~U txlnoa againto recall the Ula'

Interface~nu. Pushtheselectbuttonto select

Remote.The2910Aisnowreadyto~ift ~

c~~~~.

NOTE

1M 29JOADisplayandfronI ~l COIItroUan

di.rDbledwilen ill nIIIOtL 1M SELECT~

r,.mains actiVl'. R,.mol,. Call be ",.l,.ct,.d or

unselecledonlyfrom 1Mfront panel.

b) Tra~~mit a commaodto the 2910A from a 2910A iR-pcmseI

computeror terminalto settheoutputfrequencyof 2910Acommand.

the 2910A The commandshouldconsistof the

ASCDcbaracten-F <SP>XX.xxxxXXXXXXXX

<CR>" where the X's representthe frequencyin

MegaHenz.<SP>is aspICeaod<CR>is . carriage

return. SECI10N3-PE

b) Transmit a command

After receiving this command. the 2910A will

respondby transmittingtwo chanctersfollowedby

a <CR> <LF>. If the received commandwas

successfullyinle~led andexecutedby the2910A

thenthetwocharactersreturnedwill be"OK". Iftbe

receivedcommaodwas not !I_~fu1ly received

and executed then the characters8m8 will be

returned.The"N" representsanerrorcodenumber.

SeeTable 2 for aninterpretationof theerrorcodes.

NOVATECH INSTRUMENTS. 1Nc.

i) Transmit a command to the 2910A from a

computeror terminalto settheoutputamplitudeof

the 2910A. The command.-a1d coosistof the

ASCD cb8I~ -A<SP>X.xx<CR>"where the

X's representthe desired numeric value of the

Amplitude in V0115.

j) After receivingthis ~~ the 2910A will

respondasdescribedin paragraph2.4h) above.

t) The 2910A letUpcanbecban,ed using the ASCU

commandsshown"in Table 2. Sendthesecommands.

~ It atime.. desired.

1) TheQBASICrMIXOII'Bmlisting in Table7 is an

exampleprogramthatcanbeusedto sendcommands

from aPCto the2910A. It usesCOM1:aDd1200

Bad, wbk:brmy bechlDied bytheuser. It uks the

userto enter a 29.1OA command. After the user

entersthecommandandhits the Eoter/Retumkey.

the PC will transmit the command. display the

2910Aresponseandagainaskthe userto entera

SEcnON 3.PERFORMANCE TFSf AND

--~-------

WARNING

To avoid p*rsoMl illjury do ,,01r.,..ov. th.

pGMlsor co.". and do JIotope"'. Ii. 2910.4.

""I." tit. ptllI.ls alld co.." ar. properly

3.0 Introduction. The 2910A Frequency

Synthesizer requires no periodic calibration or

maintenance. It is recommended that the

.2fllA INSTRUCrIONMANUALan 1.0

-'-1c-" -: c - ~

,,' .

~~ ;': '. ~ -'. TABLE3

RECOMMENDEDTESTEQUIPMENT

TestInstnlment MInImum Soedftcatioas EIADInielDl trument

Digital Multimeter AC RMS,dB, 10MOhmimputimpedanceHP34401A

4 1/2digits,trueRMS

RFProbe 100kHzto 12MHz, with known HP34301A,Fluke85RF,

orcalibratedresponse TektronixP6420

Oscilloscope 100MHz TektronixTAS465

Terminator 50Ohm:t1% Tektronix011-0049-01

FrequencyStandard 1or2MHz,0.2V RMSto4.0V RMS NovatechInstruments29SOA

FrequencyCounter :t 1ppm,9digits TektronixCMC2.SlA,

HPS314A-OO1

.FrequencySynthesizer Able tobesetto 1or2MHz:t 5ppm NovatechInstruments2910A

Lockabletoexternalstandard

Computer PCCompatiblewith QBASICfMand

tenninalemulationsoftware

ECL BiasandLoad 50Ohmto-2.0Vor 510Ohm to -5.2V

StopWatch

NOVATECH INSTRUMENTS, 1Nc. 92910AINSTRUcnON MANUALRn 2.0

performancetest in paragraph3.1 be perfonDed

periodically to verify that the instrument is

functioniq properly. If theinsII\1-~ ckJes- ...

the performancetestthenit shouldbe returnedto

NOVA TECH INSTRUMENTS .IN c. fm repairCX'

replace~nt.

3.1 perf~1Ice T-. Referto Table3 for a

listingof the~~nded testequipmcnt.If tile

~OIDmeudedtestinsttu~t isDOtavailabledM:I1a

substitutethat ~ts the minimum specifications

sJx)uIdbe used. The ambienttemperatureDISt be

betWeen20and30degreesC.

3.1.1 Front panelvertftcation (F~-~1)

a) COODectthe2910ASignalOutto . FI~,.

Counter,turnonpowerandletthe~nt WanD

upfor30minutes.

b) Set the display to 1.00 MHz, 1.00 Vpp. The

Counter should read 1.<XXXXX>MHz %5 Hz plus 01'

minus Coonter 8CCUrICY.RepeatftX'die ~1Kies

in Table 4.

NOTE

FnqllelU:Y cOIIIIter error add.r 10dais test.

sure to acCOIIIItfor it.

c) Resetthe2910Ato 1MHz. Setthecursortothe

10Hz position(Sdigits from theriaht). Adjustup

one count and down ~ count. Verify tbM the

counter registers:t 10 Hz shift. Verify that the

2910Adisplayshowstheconectfrequency.Repeat

foreachvalueinTable2.

INC.

NOVATECH 1NSTRUMEN'n

NOTE

Unk.r" ut~m4l ~",.1IIaIiOft i.r .f"PP1i~dlor tile

ECL 0IItpIIt IU~1M CMOSl1TL output modefor

the M.xt 1e.JI.

d) b)aDdc)1m'theCM~1'Ea.

Repelt output

e)SelectHigh FrequencyEnabledaDdCM~

OUtIXIt.

f) Adjust OOtpItto ~~ies shownin Table

Verify limits shown. 5.

NOTE

Ira 1Iig1lfr,qu,ncy ,nabl,d mod, ,h,

CAlOSIECL0fIIpMtfnqwncy u four time..

,hI SIGNAL OUTPUT frlqu,ncy for

frequency.lfiIIg.. aboVI12MHz.

3.1.2 Front PanelVertftcation (Amplitude)

a) Setthe00tp1t~rx:y to0.010MHz IIKI~

amplit\Mieto 10.0Vw OC.

b) Usin,. sbcx1BNC-BNC cable aDdBNC-to-

Bananaldaptor. connect the Signal Out on the

2910A to the DMM input. Select AC volts.

autorangeontheDMM.

c) Verify thattheRMSreadingon theDMM is

between3.104V RMSand3.967V RMSwith a

nominalvaI~ of 3.536V RMS

d) SelecttheSfIIFT dB function00theDMM. The

displayIt.IId read0dB.

10 2910A UCrION MANUAL Rn U

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