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LeCroy DA18000AC

Differential Amplifier

Instruction Manual

Revision A – June 2006

Содержание DA18000AC

Страница 1: ...LeCroy DA18000AC Differential Amplifier Instruction Manual Revision A June 2006 ...

Страница 2: ... products 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...

Страница 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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Страница 5: ...ECROY 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 Type K Input Leads 4 3 USE OF DC 2 ATTENUATOR 4 4 GROUNDING 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 Ref...

Страница 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 CE 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 ...

Страница 7: ...ard 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 personal i...

Страница 8: ... should 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 l...

Страница 9: ...ns with those components listed in the Certificate ESD Sensitive The inputs of the DA18000AC 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 type K connectors APPLICATIONS The DA18000AC amplifier is ideally suited for acquiring differential signals common in high sp...

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Страница 11: ...ESSORIES Type K Input Leads A matched pair of 50 Ω type K Input Leads is provided for direct cable connection to female type K connectors of the amplifier Type K 2 Attenuator The type K attenuator can be used to extend the differential mode range or to improve the VSWR by reducing reflections ...

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Страница 13: ... K connectors can be tightened to the same torque speci fication 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 Type K connectors use air for the dielectric as opposed to PTFE resin in type SMA Foreign material such as excessive dust can enter the dielectri...

Страница 14: ...cope To remove the DA18000AC 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 Ver...

Страница 15: ...enu CONNECTING 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 Type K Input Leads The Type K Interconnect System has been designed to connect directly to female type K connectors as well as to the higher performance 3 5 mm and 2 92 mm female connec...

Страница 16: ...y signal corruption caused by not having the amplifier connected to ground of the signal under test will be common to both inputs and will be rejected by the differential operation of the amplifier However when working in an environment with high RF ambient noise it may be better to connect the amplifier ground lead to a good RF ground near the point where the signal is being measured To find out ...

Страница 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...

Страница 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 ...

Страница 19: ...the 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...

Страница 20: ...ode 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...

Страница 21: ...quency 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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Страница 23: ...quipment and accessories or their equivalents that are required for performance verification of the DA18000AC 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 indicated Because the input and ...

Страница 24: ...e 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 DA18000AC amplifier as well as those of the oscilloscopes are sensitive to Electrostatic Discharge ESD To avoi...

Страница 25: ...f 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 positive slope j Set math trace F1 to the Ptrace mean of Channel 1 Figure 7 2 ...

Страница 26: ...DA18000AC Differential Amplifier 7 4 DA18000AC 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 ...

Страница 27: ...m Channel 1 of the SDA 18000 and connect the cable only to the input of the DA18000AC amplifier Connect the cable from Channel 2 TDR to the input of the amplifier 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 4Rise Time Measurement p Record the calculated rise time as Amplifier Rise Time in the...

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Страница 29: ... K 2 92 mm The type K input leads will connect directly to female type K 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 Inpu...

Страница 30: ...plifier 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 ste...

Страница 31: ...on MIL 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 Amplifier only 385 g 13 5 oz Shipping 1 36 kg 3 lbs 0 oz ...

Страница 32: ...rements and test EMC Directive EN 61326 A3 2003 EMC requirements for electrical equipment for measure ment 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 ...

Страница 33: ...require the recording of data Results to be recorded in the col umn 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...

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