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ADP300/305 Probe 

18

 

 

ADP30X-OM-E Rev B

 

REFERENCE INFORMATION 

Differential Mode and Common Mode 

Differential amplifiers amplify the voltage difference that appears between the 

+

 input and – input. 

This voltage is referred to as the Differential Mode or Normal Mode voltage. The voltage 
component that is referenced to earth and is identical on both inputs is rejected by the amplifier. 
This voltage is referred to as the Common Mode voltage and can be expressed as: 

2

Input

Input

CM

V

V

V

−

+

+

=

 

Differential Mode Range and Common Mode Range  

Differential Mode range is the maximum signal that can be applied between the 

+

 and – inputs 

without overloading the amplifier, which otherwise would result in clipping or distorting the 
waveform measured by the oscilloscope. 

The Common Mode Range is the maximum voltage with respect to earth ground that can be 
applied to either input. Exceeding the common mode range can result in unpredictable 
measurements. Because the Common Mode signal is normally rejected and not displayed on the 
oscilloscope, you need to be careful to avoid accidentally exceeding the common mode range. 

Common Mode Rejection Ratio 

The ideal differential amplifier would amplify only the differential mode voltage component and 
reject all of the common mode voltage component. Real differential amplifiers are not perfect, so 
a small portion of the common mode voltage component appears at the output. Common Mode 
Rejection Ratio (CMRR) is the measure of how well 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. The common mode gain is equal to the output voltage divided by the input 
voltage when both inputs are driven by only the common mode signal. CMRR can be expressed 
as a ratio (e.g., 10

 

000:1) or implicitly in dB (e.g., 80 dB). The higher the number the greater the 

rejection the better the performance. 

The first order term that determines the CMRR is the relative gain matching between the 

+

 and – 

input paths. To obtain high CMRR values, the input attenuators in a differential amplifier are 
precisely matched to each other. This matching includes the DC attenuation as well as the 
capacitance that determines the AC attenuation. As the frequency of the common mode 
component increases, the effects of stray parasitic capacitance and inductance in determining the 
AC component becomes more pronounced. The CMRR becomes smaller as the frequency 
increases. Hence, the CMRR is usually specified in a graph of CMRR versus common mode 
frequency. 

Содержание ADP300

Страница 1: ...LeCroy ADP300 305 Instruction Manual February 2007 ...

Страница 2: ...or the return of products to the service facility LeCroy will return all 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...

Страница 3: ...lectronic equipment in standard waste receptacles For more information about proper disposal and recycling of your LeCroy product please visit www lecroy com recycle 有毒有害物质和元素 部件名称 铅 Pb 汞 Hg 镉 Cd 六价铬 Cr6 多溴联苯 PBB 多溴二苯醚 PBDE PCBAs X O X X X X 机械硬件 O O X O O O 金属片 O O X O O O 塑料部件 O O O O X X 保护外壳 O O O O X X 电缆组件 X O X O X X 探头端部 X O X O X X O 表明该有毒有害物质在该部件所有均质材料中的含量均在SJ T11363 2006标准规定的限量要求之下 X 表明...

Страница 4: ...lies X O X O X X Probe Tips X O X O X X O Indicates that this toxic or hazardous substance contained in all of the homogeneous materials for this part is below the limit requirement specified in SJ T11363 2006 X Indicates that this toxic or hazardous substance contained in at least one of the homogenous materials used for this part is above the limit requirement specified in SJ T11363 2006 EFUP En...

Страница 5: ...ADP30X OM E Rev B v ...

Страница 6: ...vi ADP30X OM E Rev B BLANK PAGE ...

Страница 7: ...1 Auto Zero 11 REMOTE CONTROL COMMANDS 12 Introduction 12 Command List 12 Probe Auto Zero 13 Probe Bandwidth Limit 14 Probe Coupling 15 Probe Offset 16 Probe Volts div 17 REFERENCE INFORMATION 18 Differential Mode and Common Mode 18 Differential Mode Range and Common Mode Range 18 Common Mode Rejection Ratio 18 CARE AND MAINTENANCE 20 Cleaning 20 Calibration Interval 20 Service Strategy 20 Trouble...

Страница 8: ...al Characteristics 27 Warranted Characteristics 27 Typical Characteristics 28 Environmental Characteristics 28 Physical Characteristics 28 Compliance and Certifications 29 APPENDIX A 31 Performance Verification Test record 31 ADP300 ADP305 Test Record 32 APPENDIX B 33 SAC 01 Mounting Instructions 33 ...

Страница 9: ...the oscilloscope For the ADP305 the attenuation offset and bandwidth limit are all controlled from the oscilloscope s front panel or by means of remote control commands This means that the complete measurement setup can be saved and recalled by the oscilloscope and all measurement values will be correct The oscilloscope provides power to the probe so there is no need to worry about a separate powe...

Страница 10: ...G A Warning alerts you to a potential hazard Failure to adhere to the statement in a WARNING message could result in personal injury The following symbols may appear on the product This refers you to additional information contained in this manual The corresponding information in the manual is similarly denoted This is a reminder that high voltage may be present and that appropriate caution should...

Страница 11: ... Clamp Clip x Spade Terminal x Soft Accessory Case x Description of Accessories WARNING For electric shock protection only attachment accessories rated for 1000 V Installation Category III per EN 61010 1 1993 should be used with this product Plunger Hook Clip 1 Red 1 Blue Insulated 1000 V CAT III Designed to attach to wire leaded parts the overall length is 117 mm 4 60 inches and the hook extends ...

Страница 12: ...k wires cables ground leads rails and even screw heads The overall length is 134 mm 5 26 inches The steel jaw extends 12 mm 0 48 inch and opens to 25 mm 1 inch Plunger Clamp Clip 1 Red 1 Blue Insulated 1000 V CAT III Designed for attaching to hard to reach test points the entire body is fully insulated The overall length is 190 mm 7 5 inch The clamp can grab leads pins and wires up to 5 mm 0 2 inc...

Страница 13: ...l ADP30X OM E Rev B 7 Soft Accessory Case This can be used to carry probes and accessories It can also be mounted on your oscilloscope for storing all your accessories and manuals See Appendix B for installation instructions ...

Страница 14: ... source Use of the probe or the oscilloscope it is connected to in a manner other than that specified may impair the protection mechanisms Observe all terminal ratings Do not apply a potential to any input that exceeds the maximum rating of that input See chapter 9 for detailed specifications of the probe To avoid RF burns do not handle the probe while the input leads are connected to potentials a...

Страница 15: ...aintenance should be referred to qualified service personnel Any test lead or accessory provided by the user must comply with EN 61010 1 Installation Category III 1000 V rating Do not operate with suspected failures If you suspect there is damage to the probe have it inspected by qualified service personnel Use only LeCroy supplied accessories or order replaceable parts listed in the Replacement P...

Страница 16: ...tromagnetic field that passes through the loop and may induce noise into the probe inputs Because this signal will appear as a differential mode signal the probe s common mode rejection will not remove it This effect can be greatly reduced by twisting the input leads together to minimize the loop area High common mode rejection requires precise matching of the relative gain or attenuation in the a...

Страница 17: ...es the ADP305 is capable of switching the bandwidth limit from Off maximum bandwidth to 20 MHz in the channel Vertical Adjust dialog Auto Zero The ADP30X incorporates an Auto Zero function to remove the DC offset from the Differential Amplifier s output Auto Zero must be invoked by the user You may do this even while the probe is connected to a live circuit After several minutes of warm up or when...

Страница 18: ...the channel that the ADP30X is connected to These commands are similar to the channel commands that use the prefix Cx The difference is that the PRx form refers to the probe tip whereas the Cx form refers to the oscilloscope input connector For example PRx VDIV sets the Volts per division at the probe tip while Cx VDIV sets the Volts per division at the BNC input connector without factoring the ga...

Страница 19: ...auto zero cycle in the ADP30X probe to remove any offset drift The probe input can remain connected to the test circuit during the auto zero cycle Command Syntax channel AutoZero channel PR1 PR2 PR3 PR4 Example The following command initiates an auto zero in the ADP30X Differential Probe attached to channel 1 CMD PR1 AZ CALL IBWRT SCOPE CMD ...

Страница 20: ...d is not available with model ADP300 The PRx Bandwidth_Limit query returns the upper bandwidth limit setting for the differential probe connected to the specified channel Command Syntax channel BWL upper bandwidth channel PR1 PR2 PR3 PR4 upper bandwidth OFF 20M Query Syntax channel BWL Response Format channel BWL upper bandwidth Example The following command sets the upper bandwidth of the ADP305 ...

Страница 21: ... probe The PRx COUPLING query returns the coupling mode of the selected channel Command Syntax channel CouPLing coupling channel PR1 PR2 PR3 PR4 coupling DC GND Query Syntax channel CouPLing Response Format channel CPL coupling Example The following command sets the coupling to DC in the ADP30X differential probe connected to channel 2 CMD PR2 CPL DC CALL IBWRT SCOPE CMD ...

Страница 22: ...el OFfSeT offset channel PR1 PR2 PR3 PR4 ADP305 offset 40V to 40V for 200 mV div to 499 mV div LC series or 100V to 100V for 200 mV div to 499 mV div LT series or 100V to 100V for 500 mV div to 9 9 V div or 1000V to 1000V for 10V div to 99 V div or 1400V 4 V Div setting to 1400V 4 V Div setting for 100 V div to 350 V div ADP300 offset 100V to 100V for 1 V div to 9 9 V div or 1000V to 1000V for 10 ...

Страница 23: ...l sensitivity to the closest value and set the VAB bit bit 2 in the STB register The PRx VOLT_DIV query returns the vertical sensitivity at the probe input of the specified channel Command Syntax channel Volt_DIV sensitivity channel PR1 PR2 PR3 PR4 sensitivity 200 mV to 350 V for the ADP350 sensitivity 1 V to 350 V for the ADP300 Note The suffix V is optional Query Syntax channel Volt_DIV Response...

Страница 24: ...would amplify only the differential mode voltage component and reject all of the common mode voltage component Real differential amplifiers are not perfect so a small portion of the common mode voltage component appears at the output Common Mode Rejection Ratio CMRR is the measure of how well the amplifier rejects the common mode voltage component CMRR is equal to the differential mode gain or nor...

Страница 25: ...dom a pure sine wave Signals with pulse wave shapes contain frequency components much higher than the repetition rate may suggest As such it is very difficult to predict actual performance in the application for CMRR versus frequency graphs The practical application of these graphs is to compare the relative common mode rejection performance between different amplifiers ...

Страница 26: ...rbished probe A probe that is not under warranty can be exchanged for a factory refurbished probe for a modest fee You must return the defective probe in order to receive credit for the probe core Troubleshooting If the probe is not operating properly the problem may be the way in which it is used Before assuming that the probe is defective perform the following troubleshooting procedures 1 For Le...

Страница 27: ... and address of the owner Probe model and serial number Description of failure 5 Pack the probe case in a cardboard shipping box with adequate padding to avoid damage in transit 6 Mark the outside of the box with the shipping address given to you by the LeCroy representative be sure to add the following ATTN RAN assigned by the LeCroy representative FRAGILE 7 Insure the item for the replacement co...

Страница 28: ...ue Safety Alligator Clips PK30X 2 Mueller BU 656 2 Red Mueller BU 656 6 Blue Plunger Jaw Clips PK30X 3 Mueller BU 20434 2 Red Mueller BU 20434 6 Blue Plunger Clamp Clips PK30X 4 Mueller BU 20433 2 Red Mueller BU 20433 6 Blue Safety Spade Terminals PK30X 5 Mueller BU 30214 2 Red Mueller BU 30214 6 Blue Supplier of alternate accessories Mueller Electric Co 1583 East 31st Street Cleveland OH 44114 Ph...

Страница 29: ... adjust the OFFSET to 0 000 V 5 Using accessory clips attach the Red clip to the CAL out and the Blue clip to the ground post of the CAL out signal For oscilloscopes with the CAL signal on a BNC connector a BNC to Banana adapter e g Pomona model 1296 may be used 6 Press AUTOSETUP 7 Set the sensitivity of the probe to 1 V div 8 Set the CAL output to 1 Vp p square wave 9 Verify that the displayed sq...

Страница 30: ... Sine Wave output waveforms 20 Vp p Agilent Technologies 33120A or Stanford Research Model DS340 or Leader LAG 120B BNC Coaxial Cable Male to Male 50 Ω Cable Pomona 5697 36 Calibration Fixture ProBus Extender Cable LeCroy PROBUS CF01 Banana Plug Adapter Female BNC to Dual Banana Plug Pomona 1269 or Mueller BU 00260 Insulated Banana Plug Insulated Banana Couplers 2 Insulated BNC to Shrouded Banana ...

Страница 31: ...na plug adapter connected to the DMM 7 Connect the BNC connector from the probe under test to the BNC to banana plug adapter on the DMM 8 Connect the insulated banana plug adapter to the function generator 9 Using the insulated banana couplers connect the positive lead Red of the probe under test to the positive output of the BNC to banana plug adapter and the negative lead Blue to the negative or...

Страница 32: ...the result by 100 to get the error in percent 100 1 100 x ge InputVolta ge utputVolta xMeasuredO Error 18 Record the answer to two significant places x xx on line 18 in the Test Record 19 Verify that the error is 2 00 This completes the Performance Verification Procedure Complete and file the Test Record as required to support your internal calibration procedure If the criteria in steps 14 or 19 a...

Страница 33: ...tion Single ended Ground referenced Intended Output Load 1 MΩ Output Connector ProBus Input Attenuation 100 or 1000 Bandwidth Limit Filter 20 MHz ADP305 only Interface ProBus Oscilloscope Compatibility LeCroy LT or LC series oscilloscopes with firmware version 8 5 or higher or X Stream oscilloscopes Not available for 9300 series oscilloscopes Warranted Characteristics Warranted characteristics are...

Страница 34: ...w Rate referenced to input ADP300 60 000 V µs ADP305 300 000 V µs AC Noise 50 mV rms Common Mode Rejection 50 Hz 60 Hz 80 dB 10 000 1 100 kHz 50 dB 300 1 Input Impedance 4 MΩ 8 pF either input to ground Propagation Delay 20 ns Environmental Characteristics Temperature operating 0 C to 50 C 32 to 122 F Usage Indoor Relative Humidity 80 max up to 31 C decreasing linearly to 40 max at 50 C Altitude 4...

Страница 35: ...ote The voltage derating curve provides the maximum voltage that can be applied to the probe inputs without risking damage to the probe The Burn Limit is the voltage limit that should be used when the input leads are being hand held This limit is derived using the methodology described in EN 61010 1 section 6 3 1 2 ...

Страница 36: ...ADP300 305 Probe 30 ADP30X OM E Rev B Typical CMRR vs Frequency ...

Страница 37: ... are the actual specification limit checks 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 Model _______________________ Serial Number ______________________...

Страница 38: ...ption Intermediate Data Test Result Gain Accuracy 5 Function Generator Output Voltage ________________ V 11 Probe Output Voltage ________________ V 13 1000 Gain Error Test limit 1 ___________ 16 Probe Output Voltage ________________ V 18 100 Gain Error Test limit 2 ___________ ...

Страница 39: ...be clean and free of any lubricant 3 Position the pouch on top of the oscilloscope Verify that there is enough clearance for the swing up handle 4 Peel off the paper backing from the top of the hook and loop strips 5 Press the pouch firmly against the top surface of the oscilloscope in the position determined in step 2 6 Open the pouch and use a small roller to squeeze out any air bubbles from und...

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