User manual - CRS+ - Laplace Instruments Ltd
Contents
1. by Cranage EMC Technology serial number 002742 EMC analyser type SA1002 A serial number 1025 Detector Peak RBW 200Hz and 9KHz Dwell time 200ms and 12ms Frequency Step 100Hz and 5KHz Pre selector type RF915 serial number 1005 The master unit is scanned before and after the target CRS to ensure that no changes or drift in the equipment occurs during the correlation process Results from both the master and target are processed using an excel spreadsheet such that any differences between the two are reflected in the calibration data for the target unit The software checks that there are no differences greater than 2 dBuV between any units This ensures that all units are totally consistent Accuracy Measurement uncertainty due to the master CRS 1 5dB Measurement uncertainty due to the correlation 1 0dB Temperature 10 C to 30 C lt ldB Long term drift lt 1dB over 12 months CRS User Guide LAPLACE INSTRUMENTS LTD 3B Middlebrook Way CROMER NR27 9jR UK www laplaceinstruments com CRS calibration Correlation file Master Silver calibrated 22 01 09 Report ref R3114 E8488 Cranage EMC Target 08CR007 Correlated 23 01 09 Live L1 Neutral L2 Frequency Mast2. Laplace Instruments Ltd amp The Conducted Emission Reference source USER NOTES amp Calibration Data Laplace Instruments Ltd CRS User Guide INDEX Introduction Shipping list Description Front panel Rear panel Power Operation Connection Operating modes Calibration data Calibration background CRS User Guide CRS Conducted Emission Reference Source Chapter 1 Introduction The CRS has been developed to provide a means of quickly and very easily checking the accuracy of EMC conducted emission test systems It is a stable source of known emission levels whose levels are trace able to National Standards UK The frequency range covers that of internationally specified conducted emission limits 10KHz 30MHz and the output levels are up to the same order as common limit levels The output is in the form of a comb ie a harmonic series based on a spacing of 10KHz This means that every 1OKHz there is a continuous narrow band signal output from the CRS This frequency spacing means that the spectrum as measured by standard EMC Receivers and analysers in band B is essentially a continuous line whilst in band A the series of peaks can be observed assuming the correct 200Hz RBW is invoked by the measuring device Because each harmonic is a continuous signal the selection of detector Peak QP or Average will only marginally affect the results Key features Small size battery powere
3. d Simple operation simply connect to the EUT port and switch on Output level in band B similar to many commercial standards eCan be used via adaptors with any standard mains output socket CRS unit Output aa cable fitted with mains plug to suit territory of UK US Euro etc Earth bonding cable User manual and calibration data Type AA LR6 primary batteries The output adaptor cable can be produced by the user to suit non standard reguirements if necessary Contact Laplace Instruments Ltd for guidance CRS User Guide 2 1 Description The CRS comprises the main unit plus an output adaptor lead and batteries The adaptor lead is a short lead with an IEC plug at one end the other having a mains plug suitable for attachment to the output socket of a LISN If for example a CRS is shipped for use in mainland Europe a Schuko plug will be fitted to the supplied adaptor lead If required several adaptor leads can be supplied to suit different LISNs within one organi sation Front panel Output socket IEC Connect to unpowered LISN 5 oo Mode switch A a Sa Neutral L2 indicator Yellow Live L1 indicator Red Serial number label under Safety earthing point Rear Panel Battery holder 7 CRS x place Instruments Lid ak BN u C WEE CHO267RW amp CRS User Guide Power The CRS I uses standard primary cells type AA LR6 1 5V Quantity 2 cells ar
4. e required When the battery voltage drops so low that the output may be compromised the CRS will turn off thus avoiding erroneous results To fit the batteries use a coin to press and turn the top cap of the battery holder quarter turn anti clockwise The top cap will release Fit 2 batteries with the ve top cap uppermost towards the top cap Press the top cap down on the batteries align the two lugs and turn clockwise quarter turn to retain Operation To check that the CRS is working and that the batteries are OK press the mode button once The red indicator L should light Double click the mode button again and now the yellow N indicator should light Click the mode button again and the yellow indicator should go out and then both indicators should flash on for 1 second to confirm that the CRS is switching off Connection Disconnect the LISN from the mains supply see note below Connect an earth bonding wire from the earth stud on the CRS to a reliable earth point en suring a good connection Connect the supplied adaptor lead from the IEC socket on the CRS to the mains EUT outlet on the LISN Position the CRS as far from the LISN as the cable will permit It has been no ticed that the magnetic field created by the air core inductors in LISNs can couple to the CRS and can affect the performance at high frequencies Never locate the CRS on top of the LISN Ensure the connections to the receiver analys
5. er are as used for measuring the EUT with any pre amplifiers and or transient limiters switched on Note The removal of mains from the LISN is good safety practice However the CRS will NOT be damaged if the LISN is live connected to the mains This practice is NOT rec ommended It is absolutely essential that in these circumstances the earth bonding con nection has good integrity CRS User Guide Operating Modes Switch the CRS L indicator on by pressing the mode button Sweep the receiver analyser over the desired band Generally use Peak detector for speed The choice of detector should not significantly affect the results Compare the result with the CRS calibration data Any significant deviations should be in vestigated before using the eguipment for compliance testing Repeat with N selected When the checks are completed ensure that the CRS is switched off to conserve the bat tery CRS User Guide Calibration data Each CRS is individually calibrated and the data shown on the following pages The calibration is by correlation against a master source which is itself regularly measured by an independent UKAS United Kingdom Accrediation Service accredited test laboratory using equipment which is directly traceable to national standards A copy of the test certificate and UKAS results are included in Appendix 1 The correlation was performed with the following equipment LISN type VN 1
6. er calibration Target Target corrected Master calibration Target Target corrected P QP Pk Pk QP Pk QP Pk Pk QP 0 035 35 5 4 34 5 33 8 35 5 4 35 5 34 81 0 055 40 78 39 69 39 84 38 91 0 105 45 52 44 59 45 58 44 73 0 2 48 47 05 48 1 47 22 0 4 48 6 47 78 49 25 48 26 0 6 49 17 48 28 49 5 48 51 1 49 18 48 24 49 5 48 49 1 5 49 19 48 14 49 5 48 4 2 49 48 06 49 47 48 32 3 49 48 49 5 48 2 4 48 9 47 86 49 5 48 2 5 48 6 47 58 49 2 48 1 6 48 45 47 41 49 1 48 05 8 48 35 47 4 48 94 48 01 10 48 2 47 22 48 74 47 7 12 48 47 13 48 4 47 38 14 47 8 46 87 47 6 46 58 16 47 4 46 4 46 8 45 87 18 46 3 45 4 46 45 1 20 45 8 45 45 44 18 22 44 9 43 88 44 9 43 97 25 44 1 43 08 41 7 40 8 27 43 3 42 36 40 1 39 24 30 39 8 38 9 38 8 38 98 CRS Live output CRS Neutral output 60 60 50 50 40 fo y 40 gt gt m 30 amp 30 ni 20 20 10 10 0 0 0 01 0 1 1 10 100 0 01 0 1 1 10 100 Frequency MHz Frequency MHz
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