LAPLACE INSTRUMENTS LETIS User manual

LETIS
Laplace EMC Test Integration System
User Guide
Issue1.0
May2005
LAPLACEINSTRUMENTSLTD

INTRODUCTION
TheLETISisdesignedtosimplifytheoperationofintegratedemissionsand
immunitytestsystemsbasedontheLaplace rangeofequipment. Itwill automatically
switchpoweramplifiersattheappropriaterangechangefrequency(normally1GHz)
andpermitswitchingbetweenimmunitymodeandemissionsmeasurementmode.
TheLETISiscontrolledviaUSBportfromthestandardRFSynthsoftwareprovided
withtheRF1000, RF2000 orRF3000 synthesisers.
Safetyfeaturesincludetheswitchingofpoweramplifiersto‘standby’modewhen
theyarenot‘on-line’andsegregationofRFfeedsbetweentheemissionspathandthe
immunitypath.
Operationcanbeeitherfullyautomatic, ormanualfromthefrontpanel.
Description
TheLETISusesthesamecaseformatasthestandardLaplace rangeof
instrumentationandcanbestackedinthenormalmanner. Powerisprovidedbymains
andhasanautosensingPSUwhichcanaccept110V–240V, 50/60Hz.
TheUSBportandmainspowersocketareontherearpanel, all otherconnectorsand
controlsareonthefrontpanel.
FrontPanel
Controlsandindicators
ModeSelectorswitch
withmodeindication
Emissionsmode Immunitymode Amplifierselected
Indicator indicator indicator
RFconnection
tocell
Power
LaplaceInstrumentsLtd
LETIS-Laplace EMCTestIntegrationSystem Madein UK
Amplifier1connections
Amplifier2connections
To emissions
analyser
EMISSIONS IMMUNITY
Auto
Emissions
Amp1
Amp2
ToSynthesiser
RFconnection
tocell
RFconnection
tocell
PowerPower
LaplaceInstrumentsLtd
LETIS-Laplace EMCTestIntegrationSystem Madein UK
Amplifier1connections
Amplifier2connections
Amplifier1connectionsAmplifier1connections
Amplifier2connectionsAmplifier2connections
To emissions
analyser
To emissions
analyser
EMISSIONSEMISSIONS IMMUNITYIMMUNITY
AutoAuto
EmissionsEmissions
Amp1Amp1
Amp2Amp2
ToSynthesiserToSynthesiser

Connections
RFsignalfrom RFsignals
Synthesiser topoweramps
RFtoemissions RFconnections Interlocksto
Analyser topowerampspoweramps
RFconnectionInterlockfrom
tocell synthesiser
Operation
1.Connectall cablesasshownbelow.
2.Switchall unitson.
3.TheLETISshoulddefaulttoAuto, Emissionsmode.
4.Thesystemcanbeusedforemissionstestingonlyatthisstage.
5.Forautooperationandimmunitytesting, connecttheUSBcablefromthe
LETISandthePC.
6.RuntheRFSynthsoftware.
7.TheLETISwill switchtoapoweramplifieronlywhenactuallyrunningan
immunitytest.
8.Ifyouneedemissionstesting, simplyclosetheRFSynthsoftware.
9.Forimmunitytesting, leavethemodeinAuto. Thepoweramplifierswill
automaticallyswitchat1GHz.
NOTES
∗ IfnotusingtheRFSynthsoftware, themodeselectorswitchcanbeusedto
operatethesysteminManualmode.
∗ IftheswitchisusedtoexitAutomode, theRFSynthsoftwaremustbe
restartedtoresumeAutooperation.
RFconnection
tocell
Power
LaplaceInstrumentsLtd
LETIS-Laplace EMCTestIntegrationSystem Madein UK
Amplifier1connections
Amplifier2connections
To emissions
analyser
EMISSIONS IMMUNITY
Auto
Emissions
Amp1
Amp2
ToSynthesiser
RFconnection
tocell
RFconnection
tocell
PowerPower
LaplaceInstrumentsLtd
LETIS-Laplace EMCTestIntegrationSystem Madein UK
Amplifier1connections
Amplifier2connections
Amplifier1connectionsAmplifier1connections
Amplifier2connectionsAmplifier2connections
To emissions
analyser
To emissions
analyser
EMISSIONSEMISSIONS IMMUNITYIMMUNITY
AutoAuto
EmissionsEmissions
Amp1Amp1
Amp2Amp2
ToSynthesiserToSynthesiser

∗ WheninAutomode, pressingthemodeselectorswitchdownwill exitAuto
mode(greenLEDturnedoff)butleavetheselectedchannelunchanged.
ThereforeusetheUporDownpositionstoselecttherequiredchannel. Ifthe
switchisusedUPtoreselectAutooperation, theRFSynthsoftwaremustbe
restarted(asdescribedabove).
ThediagramshowsatypicalsystemwithSA1000 emissionsanalyser, RF2000
synthesiser, RF1100 andRF1200 poweramplifiers. All otherconfigurationswill be
similarorhavesomesectionsomitted.
ToCell
Control
RF
RS232
USB
USB
ToPC
ToCell
Control
RF
RS232
USB
USB
ToPC