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DA18000 Differential Amplifier

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DA18000-OM-E Rev A

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Summary of Contents for DA18000

Page 1: ...LeCroy DA18000 Differential Amplifier Instruction Manual December 2006 ...

Page 2: ...oducts under warranty with transportation charges prepaid This warranty replaces all other warranties expressed or implied including but not limited to any implied warranty of merchantability fitness or adequacy for any particular purposes or use LeCroy shall not be liable for any special incidental or consequential damages whether in contract or oth erwise 2006 by LeCroy Corporation All rights re...

Page 3: ...nd laboratory use Part 031 Safety requirements for hand held amplifier assemblies for electrical measurement and test and that conformity with Council Directive 89 336 EEC is based on EN 61326 A3 2003 EMC requirements for electrical equipment for measurement con trol and laboratory use Emissions EN 55011 A2 2002 Radiated Emissions Immunity EN 61000 4 2 A2 2001 Electrostatic Discharge EN 61000 4 3 ...

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Page 5: ...SERIAL DATA ANALYZER 4 1 AUTOCOLOR ID 4 2 OPERATION WITH THE SDA 18000 4 2 CONNECTING THE AMPLIFIER TO THE TEST CIRCUIT 4 3 2 92 mm Input Cables 4 3 USE OF DC 2 ATTENUATOR 4 4 DYNAMIC RANGE 4 4 Care and Maintenance 5 1 CLEANING 5 1 SERVICE STRATEGY 5 1 RETURNING AN AMPLIFIER FOR CALIBRATION OR SERVICE 5 1 RETURNING AN AMPLIFIER TO A DIFFERENT COUNTRY 5 2 REPLACEMENT PARTS 5 2 Reference Information...

Page 6: ...ons 8 1 NOMINAL CHARACTERISTICS 8 1 General 8 1 WARRANTED CHARACTERISTICS 8 1 TYPICAL CHARACTERISTICS 8 2 ENVIRONMENTAL CHARACTERISTICS 8 3 PHYSICAL CHARACTERISTICS 8 3 COMPLIANCE AND CERTIFICATIONS 8 4 EC Declaration of Conformity 8 4 Appendix A A 1 PERFORMANCE VERIFICATION TEST RECORD A 1 ITEMS TESTED A 1 EQUIPMENT USED A 1 TEST RECORD A 1 ...

Page 7: ...ial hazard It calls attention to the sus ceptibility of the equipment to Electrostatic Discharge ESD induced damage if anti static measures are not taken OPERATOR SAFETY To avoid personal injury and to prevent damage to the probe or any products connected to it review the following safety precautions To avoid potential hazards use the probe only as specified To avoid damage to the amplifier or per...

Page 8: ...ould be operated in a clean dry environment The design of the differential amplifier has been verified to conform to EN 61010 031 safety standard per the following limits Installation Overvoltage Category I Refers to signal level which is applicable for equipment measuring terminals that are connected to source circuits in which measures are taken to limit transient voltages to an appropriate low ...

Page 9: ...tions with those components listed in the Certificate ESD Sensitive The inputs of the DA18000 amplifier are sensitive to Electrostatic Discharge ESD To avoid causing damage to the ampli fier always follow anti static procedures wear wrist strap etc when using or handling the 2 92 mm connectors APPLICATIONS The DA18000 amplifier is ideally suited for acquiring differential signals common in high sp...

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Page 11: ...ES 2 92 mm Input Cables A matched pair of 50 Ω 2 92 mm Input Cable is pro vided for direct cable connec tion to female 2 92 mm connectors of the amplifier 2 92 mm 2 Attenuator The 2 92 mm attenuator can be used to extend the differen tial mode range or to improve the VSWR by reducing reflec tions ...

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Page 13: ... mm connectors can be tightened to the same torque specification as is used for type SMA without damage Note When connecting SMA or 3 5 mm connectors always align the male and female parts before insertion to prevent damage to the female center connector 2 92 mm connectors use air for the dielectric as opposed to PTFE resin in type SMA For eign material such as excessive dust can enter the dielect...

Page 14: ...ope To remove the DA18000 from the LeCroy oscilloscope move the amplifier up and down while pulling gently till a loud snap is heard indicating that the amplifier is unlatched from the oscilloscope AUTOCOLOR ID When the amplifier is connected to a SDA 18000 the LED will illuminate in the default color of the channel to which the amplifier is connected OPERATION WITH THE SDA 18000 Figure 4 1 Vertic...

Page 15: ...NECTING THE AMPLIFIER TO THE TEST CIRCUIT For all modules and interconnect leads positive voltages applied to the input relative to the input will deflect the oscilloscope trace towards the top of the screen 2 92 mm Input Cables The 2 92 mm Interconnect System has been designed to connect directly to female 2 92 mm connectors as well as to the higher performance 3 5 mm and 2 92 mm female connector...

Page 16: ...ect vertical scale factor and amplitude measurement results you must inform the oscilloscope when the attenuator is being used This is done in the Vertical Adjust DA18000 control dialog for the channel that the amplifier is connected to DYNAMIC RANGE The DA18000 amplifier has no gain or attenuation control The system gain is fixed at x1 Exceeding the common mode range may introduce distortion to t...

Page 17: ...f possible describe the defect or failure In case of products returned to the factory a Return Authorization Number RAN should be used The RAN can be established by contacting your nearest LeCroy sales office representative or the North America Customer Care Center Return shipment should be prepaid LeCroy cannot accept COD or Collect Return ship ments We recommend air freighting Note It is importa...

Page 18: ...ning a probe for calibration or service you ll need to mark shipments returned for service as a Return of US manufactured goods for warranty repair recalibration If there is a cost involved in the service put the cost of the service in the value column and the original value of the product at time of purchase in the body of the invoice marked For insurance purposes only Be very specific as to the ...

Page 19: ...he oscilloscope the user needs to be careful to avoid accidentally exceeding the com mon mode range Because the input signal of a differential amplifier is not referenced to ground the concept of Vpeak versus Vpeak peak may be confusing With a ground referenced signal Vpeak is the maximum instantaneous voltage amplitude the signal will have with respect to ground In a differential system there is ...

Page 20: ...e voltage component Real differential amplifiers are not perfect and a small portion of the common mode voltage component appears at the output Common Mode Rejection Ratio CMRR is the measure of how much the amplifier rejects the common mode voltage component CMRR is equal to the differential mode gain or normal gain divided by the common mode gain Common mode gain is equal to the output voltage d...

Page 21: ...uency The common mode frequency in these graphs is assumed to be sinusoidal In real life appli cations the common mode signal is seldom a pure sine wave Signals with pulse wave shapes contain frequency components much higher than the repetition rate may suggests As such it is very difficult to predict actual performance in the application for CMRR versus frequency graphs The practical application ...

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Page 23: ...Table 7 1 lists the test equipment and accessories or their equivalents that are required for performance verification of the DA18000 Differential Amplifier This procedure has been developed to minimize the number of parameters required to be calibrated in the test instrumentation Only the parameters listed in boldface in the Minimum Requirements column must be cal ibrated to the accuracy indicate...

Page 24: ...has to be performed in an indi rect way First you have to measure the rise time of the source i e the rise time of the pulse generator TDRs and the oscilloscope Second measure the rise time of the system pulse generator amplifier and oscilloscope The rise time of the amplifier alone can then be deter mined from these two measurements ESD Sensitive The inputs of the DA18000 amplifier as well as tho...

Page 25: ...e generators g Initialize the TDR by touching the TDR Main tab Figure 7 1 Timebase Menu h Connect the ST 20 TDR coaxial cable from Channel 1 of the WE 9000 via the LPA K adapter to Channel 1 of the SDA 18000 Be sure to properly torque all connectors 8 in lbs i Set the SDA 18000 to Channel 1 and the timebase to 500 ps div and 60 GS s Set the scope to trigger on Channel 1 and edge triggering to posi...

Page 26: ...DA18000 Differential Amplifier 7 4 DA18000 OM E Rev A Figure 7 2 Math Menu Setup k Set a measurement function to measure Rise 20 80 Figure 7 3 Figure 7 3 Measure Menu Setup ...

Page 27: ...the cable from Channel 2 TDR to the input of the ampli fier n Measure the 20 80 rise time and record the measurement as System rise time tsystem in the Test Record o Calculate the amplifier s rise time Figure 7 4 Rise Time Measurement p Record the calculated rise time as Amplifier Rise Time in the Test Record q Verify that the calculated rise time for the DA18000 is less than 19 ps This concludes ...

Page 28: ...tance accuracy should be 50 ohms in percent f Connect the DA18000 to the channel previously measured g Connect the Aux output to the positive input of the DA18000 using the same DMM adapter Connect a short to the negative input of the DA18000 h Measure the rms voltage with the scope as well as the rms voltage at the probe posi tive input Record these values i Calculate and record the system accura...

Page 29: ...92 mm input leads will connect directly to female 2 92 mm connectors on the system under test Maximum Non Destruct Input Voltage continuous 10 Vpeak Amplifier Gain 1 2 Oscilloscope display factor is calibrated to actual amplifier gain Input Impedance 100 Ω true differential Max Input Differential Mode Without 2 attenuators 400 mV 800 mVp p With 2 attenuators 800 mV 1 6 Vp p Max Input Common Mode W...

Page 30: ...ifier input Noise Amplifier only 0 5 Vrms CMRR 100 kHz to 18 GHz 16 dB See Figure 8 1 Input Match Differential Mode Without 2 attenuators 14 dB VSWR 1 5 1 With 2 attenuators 19 dB VSWR 1 25 1 Input Match Common Mode Without 2 attenuators 6 dB VSWR 3 1 With 2 attenuators 12 dB VSWR 1 7 1 Total Harmonic Distortion 2 5 at maximum input Amplifier only 1 Measured with an swept sine wave source or step ...

Page 31: ...L PRF 28800F Class 4 Temperature Operating 0 C to 40 C Temperature Non operating 40 C to 71 C Humidity Operating 5 to 80 RH Non condensing 50 RH above 30 C Humidity Non operating 5 to 95 RH Non condensing 75 RH above 30 C and 45 RH above 40 C PHYSICAL CHARACTERISTICS Cable Length 1 3 m 4 ft 3 in Weight 400 g Amplifier only 385 g 13 5 oz Shipping 1 36 kg 3 lbs 0 oz ...

Page 32: ...ents and test EMC Directive EN 61326 A3 2003 EMC requirements for electrical equipment for measurement control and laboratory use EN 55011 A2 2001 Radiated Emissions Class A EN 61000 4 2 1995 Amd2 20011 Electrostatic Discharge Immunity 4 kV contact discharge 8 kV air discharge EN 61000 4 3 A1 20031 RF Radiated Electromag netic Field Immunity 3 V m 30 MHz to 1 GHz 80 amplitude modulated with 1 kHz ...

Page 33: ...mn labeled Test Result are the actual specification limit check The test limits are included in all of these steps Other measurements and the results of intermediate calculations that support the limit check are to be recorded in the column labeled Intermediate Results Permission is granted to reproduce these pages for the purpose of recording test results ITEMS TESTED EQUIPMENT USED TEST RECORD S...

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