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Operator’s Manual

922258-00 Rev A

81

The common mode frequency in these graphs is assumed to be sinusoidal. In real life applications,
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 of these graphs is to compare the relative common mode rejection
performance between different amplifiers.

Figure 22, Typical CMRR

Figure 23, Noise Density

(Referred to the input)

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Summary of Contents for DA1855A

Page 1: ...Operator s Manual DA1855A Differential Amplifier ...

Page 2: ......

Page 3: ...DA1855A Differential Amplifier Operator s Manual February 2013 ...

Page 4: ...ys In exercising its warranty Teledyne LeCroy at its option will either repair or replace any assembly returned within its warranty period to the Customer Service Department or an authorized service center However this will be done only if the product is determined by Teledyne LeCroy s examination to be defective due to workmanship or materials and the defect is not caused by misuse neglect accide...

Page 5: ...e Option 10 Standard Accessories 10 Optional Accessories 11 Operation 11 General Information 11 Dynamic Range 11 Front Panel 12 Rear Panel 17 Instrument Settings 20 General Operating Information 23 Power Connection 24 Comparator Mode 24 Differential Mode 24 Setting Up the Oscilloscope with ProBus Interface 25 Setting up the Oscilloscope without ProBus Interface 30 Determining the Proper Offset Mod...

Page 6: ...trol Mode 47 Attenuation 47 Auto Zero 48 Bandwidth Limit 48 Coupling 49 Gain 50 Offset 51 Input Resistance 52 Probe Attenuation 53 Precision Voltage Generator 54 Volt DIV 55 Performance Verification 56 Test Equipment Required 56 Preliminary Procedure 58 Functional Check 59 Verification Procedure 60 Performance Verification Test Record 77 Reference 80 Differential Mode and Common Mode 80 Differenti...

Page 7: ...njury or damage Do not proceed until conditions are fully understood and met High voltage Risk of electric shock Measurement ground connection Safety protective ground connection Alternating Current I Power On connected to AC mains Power Off disconnected from AC mains Precautions Use proper power cord Use only the power cord shipped with this instrument and certified for the country of use Maintai...

Page 8: ...umidity at 50 C Altitude Up to 2 000 m 6 562 ft Cooling The instrument relies on forced air cooling with internal fans and vents Take care to avoid restricting the airflow to any part of the amplifier Around the sides and rear leave a minimum of 15 cm 6 inches between the instrument and the nearest object At the bottom the amplifier feet up or down provide adequate clearance CAUTION Do not block v...

Page 9: ... Power Consumption DA1855A 28 Watts 39 VA DA1855A PR2 56 Watts 78 VA Power and Ground Connections The amplifier is provided with a 10A 250V 18AWG rated grounded cord set containing a molded three terminal polarized plug and a standard IEC320 Type C13 connector for making line voltage and safety ground connections The AC inlet ground is connected directly to the frame of the instrument For adequate...

Page 10: ...t have associated tolerances General Input Configuration True Differential and Inputs Precision Voltage Generator can be selected as input source in VCOMP mode Offset Capability The Precision Voltage Generator can be used to provide true differential offset Input Coupling Selections AC Off Precharge DC Input Coupling Selection AC Off Precharge DC VCOMP Input Connectors BNC Input incorporates Probe...

Page 11: ...tenuator 0 5 V1 X10 Gain 10 Attenuator 0 5 V1 X1 Gain 10 Attenuator 5 V1 Maximum Input Slew Rate 1 Attenuator 0 15 V μsec 10 Attenuator 1 5 V μsec Maximum Common Mode Range 1 Attenuator 15 5 V 1 10 Attenuator 155 V 1 Differential Offset Range VDIFF mode referred to input X10 Gain 1 Attenuator 1 V 1 X1 Gain 1 Attenuator 10 V 1 X10 Gain 10 Attenuator 10 V 1 X1 Gain 10 Attenuator 100 V 1 Comparison O...

Page 12: ...ge Range 90 264 VAC Line frequency Range 45 66 Hz Warranted Characteristics Warranted characteristics describe parameters which have guaranteed performance Unless otherwise noted tests are provided on page 60 Performance Verification for all warranted specifications Gain Accuracy 1 uncertainty of termination resistance Bandwidth 3 dB x1 Gain 100 MHz Rise Time 3 5 nsec Calculated from bandwidth Com...

Page 13: ...n 100 nsec from 4 V input 8000 overdrive Output Zero 1 2 mV referred to input Input Leakage Current 10 pA 0 C to 45 C Differential Offset Accuracy X10 Gain 1 Attenuator 0 1 50 μV 2 X1 Gain 1 Attenuator 0 1 500 μV 2 X10 Gain 10 Attenuator 0 15 500 μV 2 X1 Gain 10 Attenuator 0 15 5 mV 2 Precision Voltage Generator 75 μV C Temperature Coefficient power consumption DA1855A 28 W 39 VA DA1855A PR2 56 W ...

Page 14: ...m 2 87 inch DA1855A PR2 8 75 cm 3 4 inch Width DA1855A 21 2 cm 8 36 inch DA1855A PR2 43 9 cm 17 3 inch Depth DA1855A 23 2 cm 9 12 inch DA1855A PR2 42 5 cm 16 7 inch Weight DA1855A 2 15 kg 4 lbs 12 oz DA1855A PR2 9 5 kg 21 lbs Shipping Weight DA1855A 3 12 kg 6 lbs 14 oz DA1855A PR2 11 3 kg 25 lbs ...

Page 15: ...mum input voltage rating Effective gain of the DA1855A including probe attenuation amplifier gain and attenuator settings is automatically displayed The DA1855A has a bandwidth of 100 MHz but any one of the three 3 pole bandwidth limit filters may be selected to reduce bandwidth to 20 MHz 1 MHz or 100 kHz to limit noise above the frequency of interest The DA1855A output is limited at 500 mV so tha...

Page 16: ...endent model DA1855A amplifiers packaged in one housing with one line power input connection The housing is intended for desk top use where it can be placed under an oscilloscope Rack Mount Versions Rack mounted versions available for models DA1855A RM Single channel rack mounted version DA1855A PR2 RM Dual channel rack mounted version Power Cable Option One must be specified at time of order Opti...

Page 17: ...rom the Channel setup dialog for the channel to which it is connected The DA1855A front panel controls will operate manually when the Differential Amplifier is connected to an oscilloscope not provided with a ProBus interface NOTE Removing the ProBus interface cable with the differential amplifier still powered up requires the DA1855A to be turned OFF and ON to access the front panel controls Dyna...

Page 18: ...r panel AMPLIFIER OUTPUT connector Gain will affect the differential mode output signal by amplifying the signal difference between the INPUT and the INPUT but will not affect the common mode signal the signal common to the INPUT and them INPUT Output Termination Proper gain is obtained when the DA1855A drives a 50 Ω load such as an oscilloscope with input impedance set to 50 Ω Automatic 50 Ω term...

Page 19: ...the AC coupling capacitor is quickly charged to the average DC input voltage OFF mode is also referred to as precharge mode Precharge is particularly useful prior to selecting AC coupling when the input voltage has a DC component in excess of 19 V The DA1855A input coupling is set to OFF and connected to the circuit under test When the INPUT is changed from OFF to AC mode the coupling capacitor is...

Page 20: ...m the PVG setting Refer to Error Reference source not found where the horizontal center line represents a power supply voltage of 5 030 V the next higher line 5 050 V and the line below the center line 5 010 V In this figure noise on a 5 030 V signal is easily displayed using 5 030 Volt offset and a vertical scale factor of 20 mV div VCOMP can be used to make precise measurements of large signals ...

Page 21: ... absolute mode DA1855 PVG increment and decrement buttons always function to increment or decrement the voltage display respectively When decrementing from a positive voltage the display always stops at zero To obtain negative voltages the button must be pushed and the increment button is used to increase the magnitude of the negative voltage This operation is natural if simply setting a voltage b...

Page 22: ...plies the effective offset The DA1855A s PVG display is changed to indicate the voltage that if applied between the INPUT and INPUT would bring the amplifier output to zero When the DA1855A is used with attenuating probes which feature readout the PVG display is scaled to include the effect of probe attenuation Effective Gain Six indicators LEDs across the top of the DA1855A front panel show the t...

Page 23: ... Fast transients will draw up to about 70 mA of input current for a brief period before the input coupling relay acts to disconnect the input CAUTION Inputs in excess of 250 Volt may cause permanent damage to the DA1855A The input is not disconnected when the ATTENUATOR is set to 10 The input attenuator can withstand up to 200 Volt continuous input Rear Panel Power Normal instrument operation is o...

Page 24: ...the display is set to read 155 000 the PVG output will actually be 15 5 Volt The decimal in the display will be in the correct location to indicate the voltage at the PVG output when no probes are attached and 1 ATTENUATOR and X1 GAIN are selected The OFFSET VOLTAGE BNC PVG output also presents the same voltage used internally for differential offset when VDIFF is selected Because the PVG is appli...

Page 25: ...ive voltage of both VCOMP and VDIFF by its attenuation factor For example a probe with a 100X attenuation factor will increase the effective full scale range by 100 Table 3 Effective Offset Range with 100 Probe Front Panel Effective Offset Settings Range with 100 Probe Gain Attenuation VCOMP VDIFF X1 1 1 55 kV 1 kV X1 10 15 5 kV 10 kV X10 1 1 55 kV 100 V x10 10 15 5 kV 1 kV Although the full scale...

Page 26: ...her Probe Coding Input This jack is to be used with Teledyne LeCroy DXC series probes to detect the probe attenuation factor Other manufacturer s probes with standard probe coding capability will be properly decoded through the DA1855A s front panel INPUT BNC connector Instrument Settings The DA1855A output is intended to connect directly to the input of an oscilloscope or other instrument but it ...

Page 27: ... you from entering a mode which could result in displaying a distorted signal resulting from overload When used with instruments lacking ProBus interface the instrument s gain and position controls should be properly set to avoid displaying the non linear portion of the DA1855A s output signal when it is in overdrive This can be accomplished by observing the following rules Turn the oscilloscope i...

Page 28: ... amplifiers have a common mode range of 15 5 volts when their internal attenuators are set to 1 and 155 volts when set to 10 The addition of a probe with an attenuation factor of ten will extend the common mode range to 1550 volts or the rating of the probe whichever is less There is a trade off however The Common Mode Rejection Ratio CMRR capability of even highly matched differential probe pairs...

Page 29: ...d with accessories that allow for three methods of connecting probe grounds In most cases when the common mode portion of the signal consists mainly of low frequencies 1 MHz and below the probe ground leads should not be connected to the ground of the circuit under test They should be connected to each other This minimizes the effects of ground loop currents The signal corruption caused by not hav...

Page 30: ... the DA1855A can be used to very accurately measure relatively small signals riding on large DC components Figure 1 Block Diagram VCOMP Mode Differential Mode The DA1855A built in Precision Voltage Generator can be used to generate a true differential offset while still allowing both inputs to be used as differential inputs This mode facilitates making measurements such as changes to a transistor ...

Page 31: ...r switch located on the DA1855A s rear panel to ON and observe the front panel indicators Initially each indicator light will be ON and the red OVERLOAD indicator will be ON as well All segments in the Precision Voltage Generator display will be ON The INPUT and INPUT Coupling Indicators will switch to OFF while the amplifier performs the Auto Zero function and back to the original setting After a...

Page 32: ... List Select menu select Atten and in the Value menu select 1 The waveform s magnitude on the oscilloscope s display will increase by a factor of 10 to 50 mV div the waveform will extend and extend off the top and bottom of the screen The X1 light will be lighted in the EFFECTIVE GAIN front panel display Reduce the function generator s output until the oscilloscope s display is again 2 divisions p...

Page 33: ...ears in the oscilloscope s display Continue adjusting the OFFSET knob until the peak of the waveform is at the centerline of the oscilloscope s display The number in the Precision Voltage Generator display is the waveform s positive peak voltage Rotate the OFFSET knob clockwise until the negative peak of the signal is now at or near the oscilloscope s display centerline By adjusting the OFFSET kno...

Page 34: ... respect to ground as it passes through the oscilloscope display s centerline By using the DA1855A in the comparison voltage mode and the oscilloscope in a high sensitivity setting highly accurate voltage measurements can be made Differential Offset Operation VDIFF Set the DA1855A up as follows through the oscilloscope user interface PVG Mode VCOMP Coupling DC DA1855A Atten Gain Manual List Select...

Page 35: ... positive and negative peaks of the waveform displayed on the oscilloscope are respectively 10 divisions above and below the display center line Rotate the OFFSET knob above the VOLTS DIV knob on the oscilloscope until the positive peak of the waveform appears in the oscilloscope s display Continue adjusting the oscilloscope s OFFSET knob until the peak of the waveform is at the centerline of the ...

Page 36: ...ut connector If the oscilloscope has 1 MΩ and 50 Ω input capability select 50 Ω If the oscilloscope has only a 1 MΩ input terminate the coaxial cable at the oscilloscope s input with a 50 Ω feed through terminator It is important that the DA1855A be terminated by 50 Ω Set the oscilloscope vertical scale factor to 50mV div Set the oscilloscope s input coupling to GND or OFF and position the trace t...

Page 37: ...cilloscope is now 50 mV div Now press the X10 GAIN button Observe the following changes The INPUT s DC light will momentarily go out and its OFF light will be lighted before returning to their previous states This momentary change is the result of the DA1855A automatically adjusting its DC Balance The X10 light will be lighted in the EFFECTIVE GAIN display and the display on the oscilloscope will ...

Page 38: ...er screen using the oscilloscope s position control Return its input coupling to DC Now press the X10 button on the DA1855A to invoke its autozero function Note that pressing the gain button that is already selected causes the DA1855A to adjust its DC balance but does not change its gain Change the Precision Voltage Generator s reading to again place the negative peak of the waveform at the oscill...

Page 39: ... to the DA1855A s INPUT or from the Trigger Signal out on the Function generator to the External trigger input of the oscilloscope Under these conditions the negative peak of the display on the oscilloscope should be very near center screen Adjust the value in the Precision Voltage Generator until the negative peak is at center screen Press the VDIFF button This internally applies the output of th...

Page 40: ... on the DA1855A to invoke its Auto balance function Note that pressing the gain button that is already selected causes the DA1855A to adjust its DC balance but does not change its gain Change the Precision Voltage Generator s reading to again place the negative peak of the waveform at the oscilloscope s centerline Note that the Precision Voltage Generator s display more accurately represents the n...

Page 41: ... choose a measurement reference point other than ground Even in ground referenced measurements signal degradation can be reduced by using the INPUT probe to select a ground reference point with the least noise This method is especially useful in eliminating hum and noise from ground loops There is one instance in which the Differential Offset VDIFF mode might result in more noise Magnetic pick up ...

Page 42: ...at a 100 attenuation factor provides Using the Oscilloscope POSITION control DOES NOT APPLY WHEN USING A TELEDYNE LECROY OSCILLOSCOPE WITH PROBUS INTERFACE When operating the DA1855A with a scope it is very important to set the oscilloscope s position and or offset control to center screen for several reasons First the linear portion of the DA1855A s 500 mV output range is centered around zero vol...

Page 43: ...loscope seem to be twice as large as they should be This comment results from not having the output of the DA1855A properly terminated into 50 Ω When interfaced using ProBus to a Teledyne LeCroy oscilloscope you do not need to be concerned about the termination resistance as the oscilloscope sets the termination mode automatically The DA1855A output impedance is 50 Ω The cable connecting the DA185...

Page 44: ...refurbished one An amplifier that is not under warranty can be exchanged for a factory refurbished unit A modest fee is charged for this service A defective amplifier must be returned in order to receive credit for the amplifier core Calibration adjustments require the use of specialized signal sources which are not commercially available Amplifiers which do not pass the performance verification m...

Page 45: ...appear on the ground lead Another technique used for measuring voltages not referenced to ground is quasi differential or channel A minus Channel B Even though this technique is safe the oscilloscope is still grounded it is still limited to measurements where the differential mode signal of interest is approximately the same amplitude or larger than the common mode signal signal being rejected A m...

Page 46: ...y when the OFF voltage is 400 Volt requires 250 ppm measurement capability To accurately view the device s approximately 1 Volt ON voltage with an oscilloscope the vertical sensitivity must be set to 200 to 500 mV div Almost all of the signal will be off screen Also this voltage change occurs in a fraction of a microsecond This means that the oscilloscope must be able to accurately display sub 1 V...

Page 47: ...ice saturation voltage Most oscilloscope users are familiar with the requirement of adjusting passive probes for low frequency compensation Under normal usage the entire waveform is on screen when a passive voltage probe s low frequency compensation is adjusted A low frequency compensation made with the entire waveform visible on screen is usually adequate for most measurements However when a sign...

Page 48: ...n the time div is decreased to value normally used to view 20 to 150 kHz switchmode power conversion circuits the slightly peaked LF compensation appears as a DC level shift Figure 6 Viewing a power FET s saturation voltage with the slightly peaked LF compensation makes the voltage appear to go negative In this example the repetition rate of the power supply is 60 kHz ...

Page 49: ...DA1855A will reject the power line portion common mode part of the signal and allows us to see the actual signal of interest Set the VOLTS DIV to 50 mV div and adjust the OFFSET to read 00 000 on the DA1855A front panel indicator Press the Autozero button to autobalance the amplifier The start of the saturation voltage measures close to 0 0 Volt since the switching device is OFF and ramps up due t...

Page 50: ...t both Q1 and Q2 are ON at the same time D1 and D2 limit the voltage caused by the primary s leakage reactance to the rail voltages By using the DA1855A and the XC100 probe the signal reference point can be changed to any point in the circuit To select the source of Q2 as the reference point connect the INPUT probe to that point To acquire the drain to source signal of Q2 place the INPUT probe on ...

Page 51: ...ve setting small details of these signals can be examined Avoiding Measurement Errors The math capabilities in modern digital oscilloscopes can save time and effort Both scalar measurements and waveform math provide direct answers for measurements that used to require considerable computation and analysis Common causes of erroneous results are Errors in conditioning the input signal such as clippi...

Page 52: ...e 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 gain or attenuation factor of DA1855A amplifier and attached probes The PRx form of these commands are only active when the DA1855A amplifier is connected to the selected cha...

Page 53: ...lso switch the Atten Gain control mode to Manual if it was to Auto mode The valid arguments with no probe attached is 1 or 10 when the input resistance is set 1 MΩ or only 1 when the input resistance is set to 100 MΩ The valid arguments must be scaled by the attenuation factor of any passive probe which is attached to the amplifier The PRx ATTENUATION query returns the attenuation of the different...

Page 54: ...ttached to channel 1 CMD PR1 AZ CALL IBWRT SCOPE CMD Bandwidth Limit PRx BANDWIDTH_LIMIT PRx BWL Command Query Description The PRx BWL command sets the upper HF 3 dB bandwidth limits of the DA1855A The arguments are in Hertz The PRx BWL query returns the upper bandwidth limit setting for the differential amplifier connected to the specified channel Command Syntax channel BWL upper bandwidth channe...

Page 55: ...The input coupling is ignored when PVG Mode is set to VCOMP Likewise the input coupling argument is not returned from a query when PVG Mode is set to VCOMP Command Syntax channel CouPLing coupling coupling channel PR1 PR2 PR3 PR4 coupling AC DC or GND coupling AC DC or GND ignored when PVG Mode is set to VCOMP Query Syntax channel CouPLing Response Format channel CPL coupling coupling Example The ...

Page 56: ...ual if it was in Auto The valid arguments are 1 and 10 The PRx GAIN query returns the gain of the differential amplifier connected to the selected channel Command Syntax channel GAIn gain channel PR1 PR2 PR3 PR4 gain 1 10 Query Syntax channel GAIn Response Format channel GAIn gain Example The following commend sets the gain of the differential amplifier connected to channel 1 to X10 CMD PR1 GAI 10...

Page 57: ...d into the effective gain Changing or removing the probe from the differential amplifier may change the maximum range If an out of range value is entered the differential amplifier will set the PVG to the closest valid value and the VAB bit bit 2 in the STB register will be set The PRx OFFSET query returns the offset voltage of the differential probe connected to the specified channel Command Synt...

Page 58: ... to 10 only 1M may be selected The units of the arguments are Ohm The PRx PINPUTR query returns the input resistance setting for the differential amplifier connected to the specified channel Command Syntax channel PINputR input resistance channel PR1 PR2 PR3 PR4 input resistance 1M or 100M when the internal attenuation is 1 without attenuating probe or 1M when the internal attenuation is 10 or an ...

Page 59: ...0 100 or 1000 are sensed and can be reported Probes which do not support probe code sensing will be reported having an attenuation of 1 Query Syntax channel PATTeNuation Response Format channel PATTN attenuation channel PR1 PR2 PR3 PR4 attenuation 1 10 100 1000 Example The following query reads the attenuation of the probe connected to the differential amplifier which is connected to channel 1 CMD...

Page 60: ...VDIFF and OFF The PRx PVGMODE query returns the operating mode of the Precision Voltage Generator PVG of the differential amplifier connected to the specified channel Command Syntax channel PVGMode mode channel PR1 PR2 PR3 PR4 mode VCOMP VDIFF or OFF Query Syntax channel PVGMode Response Format channel PVGM mode Example The following command sets the PVG operating mode of the differential amplifie...

Page 61: ...the presence of an attenuating probe on the input If an out of range value is entered the oscilloscope will set the vertical sensitivity to the closest valid 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 See page 1...

Page 62: ...tment should only be performed by qualified personnel Removing the covers from the instrument may alter critical compensation adjustments requiring the instrument to be recalibrated Re establishing these adjustments requires the use of special calibration fixtures Therefore never remove the covers The Adjustment Procedure is contained in the Service Manual Test Equipment Required The following tab...

Page 63: ... Sine Wave Generator Relative output level accurate to 0 5 dB flatness from 1 100 MHz and 50 kHz Output adjustable to 2 Vp p Tegam SG503 with TM series mainframe and 012 0482 00 output cable Terminator in line BNC 50 Ω 2 coaxial termination ITT Pomona 4119 50 AIM 27 9008 Terminator precision BNC 50 Ω 0 05 Teledyne LeCroy TERM CF01 Attenuator BNC 50 Ω 2 10 20 dB ITT Pomona 4108 20dB AIM 279300 20 B...

Page 64: ...r test equipment used to verify the performance may have environmental limitations required to meet the accuracy requirements needed for the procedure Be sure that the ambient conditions meet the requirements of all the test instruments used in the procedure NOTE When the oscilloscope input is connected to the DA1855A AMPLIFIER OUTPUT the oscilloscope input impedance must be set to DC 50 unless ot...

Page 65: ...utput cable from the oscilloscope 1 ProBus operation a Connect the ProBus and the BNC cables to the output of the DA1855A and to channel 1 of the oscilloscope b Verify that channel 1 is selected and that the DA1855 is being recognized by showing DA1855A on the screen s menu 2 Coupling a Connect the 300 mV output voltage of the square wave generator to the INPUT of the DA1855A b Verify that the tra...

Page 66: ...wn in the table in the Preliminary Procedure Verification Procedure 1 Check X1 Gain Accuracy a Set the DA1855A INPUT to DC b Connect the Sine Wave Generator output via a 50 Ω BNC coaxial cable and a standard 50 Ω termination to a female BNC to banana plug adapter c Set the DMM to measure AC Volts d Connect the banana plug adapter to the DMM e Set the sine wave generator to 70 Hz and the output amp...

Page 67: ...he reading to 100 μV resolution as Amplifier Output Voltage in the Test Record l Divide the measured amplifier output voltage from step 1 k by the sine wave generator output voltage amplifier input voltage in step 1 f Subtract the ratio from 1 0 and multiply the result by 100 to get the error in percent m Record the result to two decimal places 0 xx as X1 Gain Error in the Test Record n Check that...

Page 68: ...isconnect the sine wave generator output cable from the INPUT and remove the 50 Ω termination from the coaxial cable c Connect one female end of a BNC Tee to the sine wave generator cable d Connect a 50 Ω 10 attenuator to the male end of the BNC Tee followed by a standard 50 Ω termination Reconnect the banana plug adapter to the DMM and connect another coaxial cable from the banana plug adapter to...

Page 69: ...Tee combination on the sine wave generator cable to the Banana Plug adapter on the DMM See Figure 11 Figure 11 X10 Gain Accuracy Setup j Record the DMM reading to 100 μV resolution as Attenuator Output Voltage in the Test Record NOTE This reading should be approximately 200 mV If it is not verify that the in line attenuator and termination are installed in the correct order The 50 Ω termination sh...

Page 70: ...tion to the DA1855A INPUT o Connect the DMM to the free female end of the BNC Tee connector using the previously removed cable Figure 12 X10 Gain Accuracy Setup p Adjust the sine wave generator output amplitude to read200 mVrms 50 mV on the DMM q Record the DMM reading to 100 μV resolution as Sine Wave Generator Output Voltage in the Test Record r Disconnect the DMM cable from the BNC Tee and remo...

Page 71: ...cted output voltage Record the result to four digit resolution as Expected Amplifier Output Voltage in the Test Record x After the DMM reading has stabilized record the measured voltage to 100 μV resolution as Measured Amplifier Output Voltage in the Test Record y Calculate the error by dividing the expected output voltage recorded in step 2 w by the measured output voltage recorded in step 2 x Su...

Page 72: ...gure 14 Figure 14 10 Attenuator Accuracy e Set the sine wave generator to read 2 00 Vrms 50 mV on the DMM f Record the reading as Sine Wave Generator Output Voltage to four digit resolution in the Test Record g Divide the reading recorded in step 3 f by 10 00 and record the result as Expected Output Voltage to four digit resolution in the space provided in the Test Record h Set the DA1855A GAIN to...

Page 73: ... the expected output voltage recorded in step 3 g by the measured amplifier output voltage recorded in step 3 m Subtract this ratio from 1 and multiply by 100 to get the error in percent o Record the calculated error to two decimal places 0 xx as 10 Attenuation Error in the Test Record p Check that the calculated error is less than 1 q Disconnect the DMM sine wave generator cables and terminations...

Page 74: ...put of the leveled sine wave generator NOTE Many leveled sine wave generators including the SG503 are calibrated only when a special BNC cable is used on its output Be sure to use a cable which is specified for the generator e Insert a standard 50 Ω termination on the free end of the cable and connect the termination to the INPUT of the DA1855A Refer to Figure 16 Figure 16 X1 Bandwidth Check Setup...

Page 75: ...Measured 3 dB Frequency at X1 Gain l Check that the frequency is 100 MHz m Divide 0 35 by the 3 dB frequency in Hz recorded in step 4 k The result is the calculated rise time Record the result as Calculated Rise Time at X1 Gain in the Test Record 5 Check High Frequency CMRR NOTE Common Mode Rejection Ratio CMRR is defined as the Differential Mode Gain divided by the Common Mode Gain normalized inv...

Page 76: ... 300 mV Record the answer to two digit resolution 0 xx in the Test record This is the Differential Mode Gain at 10 MHz g Remove the leveled sine wave generator from the INPUT of the DA1855A h Connect a BNC cable from the Frequency Reference Signal Output of the sine wave generator to the External Trigger Input of the oscilloscope If the sine wave generator does not have a Frequency Reference Signa...

Page 77: ... m Set the leveled sine wave generator output amplitude to exactly 2 Vp p 4 divisions on the oscilloscope n Remove the leveled sine wave generator output cable and termination from the oscilloscope o Attach to the 50 Ω termination a female to female BNC adapter a BNC Y and a 6 BNC cable to each end of the BNC Y p Set both the DA1855A INPUT and INPUT to DC q Connect the two free ends of the 6 BNC c...

Page 78: ...o two significant places as Common Mode Gain at 10 MHz in the Test Record Keep all of the leading zero s or use scientific notation z Calculate the Common Mode Rejection Ratio CMRR at 10 MHz by dividing the Differential Mode Gain at 10 MHz as recorded in step 5 f by the Common Mode Gain recorded in step 5 y aa Record the result to two significant places as Common Mode Rejection Ratio at 10 MHz in ...

Page 79: ...y to 70 Hz e Set the high amplitude output of the sine wave generator to exactly 20 Vp p 4 divisions Adjust the oscilloscope trigger level as necessary for a stable display Take care not to alter the sine wave generator settings during the following steps f Remove the sine wave generator output cable from the oscilloscope input g Connect the open end of this cable to the female to female BNC adapt...

Page 80: ...measurement needs to be made very carefully The signal is only several hundred μV in amplitude and measuring the peak to peak amplitude of this signal using oscilloscope measurement functions may cause erroneous reading Measure only the amplitude of the common mode feedthrough not the total value of the signal plus noise m Record the displayed Common Mode Feedthrough at 70 Hz to two digit resoluti...

Page 81: ...pter and cables attached to the DA1855A inputs Refer to Figure 21 v Connect the DA1855A output to channel 1 of the oscilloscope w Set the oscilloscope to display channel 1 input coupling to DC and 50Ω and the vertical scale as necessary to measure the amplitude of the displayed signal The displayed signal is the Common Mode Feedthrough Use the oscilloscope ZOOM function and averaging if needed to ...

Page 82: ...e After the display has stabilized record the reading as PVG Zero Output Voltage in the Test Record d Check that the measured 0 0000 V output is within 0 5 mV e Set the DMM range to read 15 5 V f Press and hold MSB increment button button to right of button until the display reads 15 500V If necessary press the button once to invert the polarity g After the DMM display has stabilized record the re...

Page 83: ...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 Serial Number DA1855A Asset or Tracking Number Date Techn...

Page 84: ...e Generator Output Voltage _____________ V 2 v Amplifier Input Voltage _____________ V 2 w Expected Amplifier Output Voltage _____________ V 2 x Measured Amplifier Output Voltage _____________ V 2 z X10 Gain Error Test limit 1 _____________ 10 Attenuator Accuracy 3 f Sine Wave Generator Output Voltage _____________ V 3 g Expected Output Voltage _____________ V 3 m Measured Amplifier Output Voltage...

Page 85: ...ode Feedthrough at 70 Hz _____________ V 6 n Common Mode Gain at 70 Hz ___________ 6 o Common Mode Rejection Ratio at 70 Hz Test limit 50 000 1 __________ 1 6 x Common Mode Feedthrough at 100 kHz _____________ V 6 y Common Mode Gain at 100 kHz _____________ V 6 z Common Mode Rejection Ratio at 100 KHz Test limit 50 000 1 __________ 1 Precision Voltage Generator Accuracy 7 c PVG Zero Output Voltage...

Page 86: ...ld amplify only the differential mode voltage component and reject all of the common mode 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 norma...

Page 87: ... 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 of these graphs is to compare the relative common mode rejection performance between different amplifiers Figure 22 Typical CMRR Figure 23 Noise Density Referred to the in...

Page 88: ...00 MHz 2 GHz 1 V m 2 GHz 2 7 GHz 4 EN 61000 4 4 2004 Electrical Fast Transient Burst 1 kV on power supply lines 0 5 kV on I O signal data and control lines 4 EN 61000 4 5 2006 Power line Surge 1 kV AC Mains L N L PE N PE 4 EN 61000 4 6 2007 RF Conducted Electromagnetic Field 3 Vrms 0 15 MHz 80 MHz 4 EN 61000 4 11 2004 Mains Dips and Interruptions 0 1 cycle 70 25 cycles 0 250 cycles 4 5 1 To ensure...

Page 89: ...ce was demonstrated to the following specifications as listed in the Official Journal of the European Communities EN 61010 1 2010 Safety requirements for electrical equipment for measurement control and laboratory use Part 1 General requirements EN 61010 2 030 2010 Safety requirements for electrical equipment for measurement control and laboratory use Part 2 030 Particular requirements for testing...

Page 90: ...EE and Batteries The instrument is subject to disposal and recycling regulations that vary by country and region Many countries prohibit the disposal of waste electronic equipment in standard waste receptacles For more information about proper disposal and recycling of your Teledyne LeCroy product please visit teledynelecroy com recycle RESTRICTION OF HAZARDOUS SUBSTANCES ROHS This instrument has ...

Page 91: ...k the probe in its case surrounded by the original packing material or equivalent and box 4 Label the case with a tag containing The RAN Name and address of the owner Probe model and serial number Description of failure 5 Package 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 Te...

Page 92: ... indirect teledynelecroy com teledynelecroy com europe Protocol Analyzers Ph 44 12 765 03971 Singapore Oscillosocpes Teledyne LeCroy Singapore Pte Ltd Blk 750C Chai Chee Road 02 08 Technopark Chai Chee Singapore 469003 Ph 65 64424880 FAX 65 64427811 Singapore Protocol Analyzers Genetron Singapore Pte Ltd 37 Kallang Pudding Road 08 08 Tong Lee Building Block B Singapore 349315 Ph 65 9760 4682 China...

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