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Keysight N2820A, User Manual

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26

N2820/1A User’s Guide

2

Making Measurements

 

Quick Start

Step 4. 

Connect Probe to Scope

1

Connect the probe to any available oscilloscope channel.

Figure 8

Example of Connecting Two N2820A Probes to the Oscillo-

scope

NOTE

For N2820A probes 

always 

connect the primary cable first 

promptly

 

followed by the secondary cable. This enables the oscilloscope to 

automatically associate the two inputs to the same probe. 

Figure 8

 is an 

example of connecting two N2820A probes to non-adjacent channel 

inputs.

Summary of Contents for N2820A

Page 1: ...Keysight N2820 1A High Sensitivity Current Probes User s Guide...

Page 2: ...mercial license which is embodied in its End User License Agreement EULA a copy of which can be found at http www keysight com find sweula The license set forth in the EULA represents the exclusive a...

Page 3: ...To Determine Maximum Input Voltage and Current 44 Extreme Temperature Probing 46 Burden Voltage of N2822 4A Probe Heads 47 Dynamic Range 49 3 Using N2825A Probe Heads To Manually Identify the RSENSE R...

Page 4: ...quency Response 86 N2820A Common Mode Rejection Ratio 88 N2820A Step Response 89 N2820A Step Tracking 90 N2820A Input Impedance 92 Input Load Model 93 7 Performance Verification Average Gain of Zoomed...

Page 5: ...5A These high dynamic range probes are designed to be used on devices that have very tight geometry constraints Since these probes do not need to be degaussed and do not require frequent calibration y...

Page 6: ...o includes two amplifiers and its main output can be switched between these two views Before using an N2820A probe connect the secondary cable as described in Quick Start on page 23 The N2821A single...

Page 7: ...in Table 1 The table also lists the minimum required firmware version for the oscilloscope CAUTION Probes are ESD sensitive devices particularly at the probe heads Follow standard ESD precautions whe...

Page 8: ...illoscope Software Up to Date Keysight periodically releases software updates to support your probe fix known defects and incorporate product enhancements To download the latest firmware go to www key...

Page 9: ...nfiguring and using the heads refer to Chapter 2 Making Measurements Make Before Break MBB Connectors Five Make Before Break MBB connectors are provided with the probes The MBB connectors allow you to...

Page 10: ...nformation Accessories Accessories Supplied Accessories The N2820A and N2821A probes come with the accessories shown in Figure 2 To learn how to use these accessories refer to Chapter 2 Making Measure...

Page 11: ...ground lead when probing battery powered devices such as mobile phones Refer to To Measure Battery Powered Devices on page 31 Model Number Description Quantity N2822A 20 m RSENSE Head 1 N2824A 100 m...

Page 12: ...maged notify your Keysight Technologies Sales Office Inspect the probe If there is mechanical damage or defect or if the probe does not operate properly or pass calibration tests notify your Keysight...

Page 13: ...umber for example N2820A Product Serial Number for example MYXXXXXXXX Description of failure or service required 3 Protect the probe by wrapping in plastic or heavy paper 4 Pack the probe in the origi...

Page 14: ...14 N2820 1A User s Guide 1 General Information Returning the Probe for Service Before returning an instrument for service you must first call the Call Center at 1 800 829 4444...

Page 15: ...uct in a safe condition Note the external markings on the probe that are described in this document To avoid personal injury and to prevent fire or damage to this product or products connected to it r...

Page 16: ...ate in wet damp environments Keep product surfaces dry and clean WARNING Do Not Operate With Suspected Failures Refer to qualified service personnel WARNING Never leave the probe connected to a conduc...

Page 17: ...tion is present CAUTION The probe cable is a sensitive part of the probe and therefore you should be careful not to damage it through excessive bending or pulling Avoid any mechanical shocks to this p...

Page 18: ...negate the protective action by using an extension cord power cable without a protective conductor grounding Grounding one conductor of a two conductor outlet is not sufficient protection WARNING Only...

Page 19: ...scilloscope 32 To Measure Charge on an InfiniiVision Oscilloscope 34 To Simultaneously View Zoomed In Zoomed Out Waveforms 36 To Make Measurements Without Interrupting Your DUT 39 Extreme Temperature...

Page 20: ...resistor when calculating measurements Table 3 Description of Heads N2825A Probe Head The N2825A user defined head does not include an RSENSE resistor and is selected in situations when you want to u...

Page 21: ...Making Measurements 2 Introduction N2820 1A User s Guide 21 Figure 3 Different Probing Connections With Relative Merit...

Page 22: ...heads do not come with the sensor leads soldered on them Instead you must solder on the appropriate leads as described in Quick Start on page 23 CAUTION Always wear an ESD wrist strap when working wi...

Page 23: ...ems Standard PC board headers with 2 54 mm 0 1 contact pitch spacing MBB accessory headers mounted on the PC board You can quickly snap the socketed lead on and off the MBB header To learn about the M...

Page 24: ...robe Head Gently press the head into position on the probe amplifier while carefully mating the connector as shown in Figure 6 Figure 6 Attaching and Removing a Head from the Probe NOTE Never apply ex...

Page 25: ...d cannot be upgraded Gently snap the secondary cable into the probe amplifier as shown in Figure 7 Figure 7 Connecting the N2820A s Secondary Cable NOTE Do not remove the four head screws when removin...

Page 26: ...igure 8 Example of Connecting Two N2820A Probes to the Oscillo scope NOTE For N2820A probes always connect the primary cable first promptly followed by the secondary cable This enables the oscilloscop...

Page 27: ...uration dialog box NOTE N2820A Probes Although connecting the primary and secondary cables to adjacent channels may reduce clutter this is not a requirement For example you could connect an N2820A s p...

Page 28: ...t field to configure the input channel as a zoomed in or zoomed out channel 4 If you are using an N2825A user defined head which uses a DUT mounted RSENSE resistor enter the resistance of the external...

Page 29: ...n page 30 4 If you are using an N2825A user defined head which uses a DUT mounted RSENSE resistor press the R Sense softkey shown in Figure 10 on page 30 Then enter the resistance of the RSENSE resist...

Page 30: ...30 N2820 1A User s Guide 2 Making Measurements Quick Start Figure 10 R Sense Entry Box...

Page 31: ...the supplied ground lead between ground on your device and the probe s ground connector as shown in Figure 11 Simply snap the end of the ground lead onto the probe s connector Without the ground conne...

Page 32: ...er time with the results listed in Ampere hours Ah For N2820A probes the measurement includes the area under the curve across both zoomed in and zoomed out waveforms Figure 12 shows a Charge measureme...

Page 33: ...easurement Info Dialog Box 4 If Zoom Mode is turned on select Gate to Zoom Window to enable a reduced zoom window time span If Zoom Mode is turned off this field is not selectable grayed out 5 If more...

Page 34: ...ent determines the total current consumption over time with the results listed in Ampere hours Ah For N2820A probes the measurement includes the area under the curve across both zoomed in and zoomed o...

Page 35: ...efer to the oscilloscope s Help system Charge N Cycles The N Cycles measurement interval variation measures the value on an integral number of periods of the displayed signal If less than three edges...

Page 36: ...eously viewed on 9000 H Series Infiniium oscilloscopes and 9000A Series Infiniium oscilloscopes In dual grid view shown in Figure 15 the zoomed out waveform originates from the probe s low gain amplif...

Page 37: ...border is white output clampling is disabled Dual grid view allows simultaneous viewing of high sensitivity and high dynamic range inputs One example of using dual grid view is to quickly identify and...

Page 38: ...N2820 1A User s Guide 2 Making Measurements To Simultaneously View Zoomed In Zoomed Out Waveforms NOTE For best measurement results click Setup Acquisition and select one of the High Resolution settin...

Page 39: ...ith the MBB connector you can quickly probe multiple locations on your DUT without having to solder or unsolder the leads The MBB can be used with all RSENSE probe heads including the N2825A user defi...

Page 40: ...r more headers onto your DUT 2 Snap the sensor lead s socket onto the receptacle 3 Repeatedly plug the lead with MBB receptacle onto different headers as you probe your DUT NOTE Once attached to the r...

Page 41: ...ng Your DUT N2820 1A User s Guide 41 Figure 18 illustrates how the MBB connection changes as you gently push the receptacle onto the header while using an N2822 4A head Figure 19 on page 43 shows the...

Page 42: ...42 N2820 1A User s Guide 2 Making Measurements To Make Measurements Without Interrupting Your DUT Figure 18 Connecting the MBB Connector with N2822 4A Head...

Page 43: ...ownload a Gerber file from Keysight that defines many of the parameters needed to design the PC board connection for the MBB header Gerber files can be imported into many PC board layout applications...

Page 44: ...stics and Specifications Table 11 on page 77 and listed here Maximum Output Voltage 12V A probe Zoom In 300 A probe Zoom Out 2 Maximum Input Voltage The maximum differential input voltage is given by...

Page 45: ...aking Measurements 2 To Determine Maximum Input Voltage and Current N2820 1A User s Guide 45 For example when using an N2824A probe head with a zoom in signal the maximum input current would be 400 mA...

Page 46: ...ironmental chamber The following two sensor lead examples provide accurate measurements 6 feet of twisted pair wire using two turns per inch The DUT should be grounded to the probe 10 feet of shielded...

Page 47: ...is flowing through the probe head as shown in Figure 20 Therefore a burden voltage IR is introduced into your circuit Burden voltages may affect the circuit and will tend to increase the noise Burden...

Page 48: ...e Heads Table 4 Resistance Added by Head Components Component Resistance Contribution Round Trip Sensor Leads Without Socket 20 m Sensor Leads With Socket 40 m MBB Header Only Not Connected 20 m MBB H...

Page 49: ...2A transmit current pulses with a single acquisition When using N2820A probes on Infiniium oscilloscopes use the powerful new dual grid view as explained in To Simultaneously View Zoomed In Zoomed Ou...

Page 50: ...compromise between a value that is large enough to obtain accurate measurements while small enough to avoid negatively affecting the circuit under test Increasing the resistance decreases the noise i...

Page 51: ...normally selected in situations where a DUT mounted RSENSE resistor is used In this chapter you ll learn how to perform the following tasks which enables the oscilloscope to make accurate measurements...

Page 52: ...tance each time that you use the N2825A head with a new RSENSE On Infiniium Oscilloscopes This method is used in Step 5 Configuring the Probe on Infiniium Oscilloscopes on page 27 and is repeated here...

Page 53: ...niiVision Oscilloscopes This method is used in Step 6 Configuring the Probe on InfiniiVision Oscilloscopes on page 29 and is repeated here 1 Press the front panel channel key that is associated with t...

Page 54: ...sed for the measurements Selecting a unique name is easier than manually entering the RSENSE resistance each time that you use the N2825A head with a new RSENSE 1 Click the Setup Probe Configuration m...

Page 55: ...25A to identify measurements using a 300 m RSENSE The first time that you use the modified N2825A you must perform a one time entry of the associated RSENSE resistance on the oscilloscope For subseque...

Page 56: ...or 1 Remove the probe head by gently pulling the head straight off the probe in the direction shown Figure 23 Removing the Probe Head 2 Remove the four hex screws that secure the cover of the N2825A R...

Page 57: ...board locate ID resistor R2 as shown in Figure 26 Figure 26 Location of ID Resistor R2 5 Replace the ID resistor with any of the values listed in Table 7 The default value loaded on the board is 16 2...

Page 58: ...primary channel N2821A probes only have a primary channel c In the User Def Head Resistance field enter the resistance of the DUT s RSENSE resistor in ohms d In the dialog box click Add Head to give y...

Page 59: ...ey c Press the R Sense softkey and enter the resistance of the RSENSE resistor that you are using 10 For future reference mark your different N2825A heads using a marker pen or tape and record the inf...

Page 60: ...3 Using N2825A Probe Heads To Identify the RSENSE Resistance Using an ID Resistor Table 7 N2825A Identification N2825A Marking Associated DUT RSENSE Resistor Value ID Resistor Value Probe Name Regist...

Page 61: ...ou simply need to install your 400 m RSENSE into an N2825A probe head 1 Select a resistor of type 1 0 5W TC 600 thick film 2010 SMT The value of the precision resistor can range from 1 m to 1 M in 1 m...

Page 62: ...ads To Add a Custom Internal RSENSE Resistor Figure 27 Removing the Probe Head 3 Remove the four hex screws that secure the head s cover and remove the cover Figure 28 Removing the Cover 4 Change or a...

Page 63: ...m oscilloscopes a Click the Setup Probe Configuration menu command b Select the tab for the probe s primary channel N2821A probes only have a primary channel c In the User Def Head Resistance field en...

Page 64: ...the front panel channel key that is associated with the probe s primary input b Click the Probe softkey c Press the R Sense softkey and enter the resistance of the RSENSE resistor that you are using...

Page 65: ...ways calibrate the probe before making any critical measurements A probe calibration removes attenuation offset and gain errors as well as timing delays that are introduced by the probe The calibratio...

Page 66: ...probe Test Equipment Description N2825A User Defined Probe Head Provided with probe Pomona 3788 BNC Female to Minigrabber Test Clips Breakout Refer to http www pomonaelectronics com for more informat...

Page 67: ...a 3788 to two BNC cables using a BNC tee Then connect one of these BNC cables to a scope channel and the other BNC cable to the Aux Output BNC connector located on the Oscilloscope s rear panel as sho...

Page 68: ...isplayed on the oscilloscope For the Gain Calibration step connect the N2825A s sensor leads red and black wires as shown in Figure 31 The black wire should connect to the black test clip of the Pomon...

Page 69: ...ibration 4 To Calibrate the Probe on Infiniium Oscilloscopes N2820 1A User s Guide 69 Figure 32 Location of Calibration Adjustments NOTE The screwdriver provided with the probe is the preferred adjust...

Page 70: ...econdary channel of the probe into the oscilloscope channel you are intending to use d Configure the zoomed in path to the primary or secondary channel as necessary e Solder the sensor leads onto the...

Page 71: ...d black wires to one end of the Pomona 3781 12 2 patch cord Connect the other end of this patch cord to the oscilloscope s ground lug on the front panel A sample setup is displayed below Figure 33 Pro...

Page 72: ...adjust the offset until these settings can be used iv Turn on Vavg measurements for both channels d To set the zoomed out offset turn R2 using the supplied screwdriver until the Vavg measurement is 1...

Page 73: ...0 1A User s Guide 73 3 Initiate Calibration a In the Channel menu press the Probe softkey b Press the Calibrate Probe softkey and then press the OK softkey to begin calibration NOTE When you connect t...

Page 74: ...74 N2820 1A User s Guide 4 Probe Calibration To Calibrate the Probe on InfiniiVision Oscilloscopes...

Page 75: ...re any testing and the environmental conditions should not exceed the probe s specified limits Table 10 Characteristics and Specifications Item Characteristic Bandwidth 3 dB Zoom Out Channel DC to 3 M...

Page 76: ...specification Zoom In 300 3 Zoom Out 1 97 3 Noise ACrms 150 A with N2822A 20 m hi res mode on d 240 A with N2822A 20 m hi res mode off 30 A with N2824A 100 m hi res mode on d 50 A with N2824A 100 m h...

Page 77: ...perating tested at 95 RH 40 C Non Operating tested at 90 RH 65 C ESD 8 kV HBM Indoor Use This probe is rated for indoor use only InfiniiVision Oscilloscopes 3000 X Series with software version 2 30 or...

Page 78: ...s show the minimum and maximum current ranges versus RSENSE resistance Figure 35 Current Range of N2822 4A Heads NOTE These graphs represent a condition where the sensor leads are solder attached to t...

Page 79: ...Characteristics and Specifications 5 Current Range Graphs N2820 1A User s Guide 79 Figure 36 Current Range of N2825A User Defined Head...

Page 80: ...ed in probe input the following graph shows the typical input voltage range allowed based on the supply voltage that you are measuring For example when measuring a 5V input the input voltage range is...

Page 81: ...n probe input the following two graphs show the typical input current range allowed based on the supply voltage that you are measuring For example when using an N2824A head and measuring a 5V input th...

Page 82: ...82 N2820 1A User s Guide 5 Characteristics and Specifications Zoomed In Input Current Range Versus Supply Voltage Figure 39 Zoomed In Input Current Range Versus Supply Voltage N2822A 20 m Head...

Page 83: ...Characteristics and Specifications 5 Dimensions N2820 1A User s Guide 83 Dimensions Figure 40 Probe and Tip Dimensions...

Page 84: ...84 N2820 1A User s Guide 5 Characteristics and Specifications Dimensions...

Page 85: ...s Guide 6 Performance Data Plots N2820A Frequency Response 86 N2820A Common Mode Rejection Ratio 88 N2820A Step Response 89 N2820A Step Tracking 90 N2820A Input Impedance 92 Input Load Model 93 This...

Page 86: ...86 N2820 1A User s Guide 6 Performance Data Plots N2820A Frequency Response N2820A Frequency Response BW 590 kHz Figure 41 Frequency Response Zoomed In Channel...

Page 87: ...Performance Data Plots 6 N2820A Frequency Response N2820 1A User s Guide 87 BW 3 5 MHz Figure 42 Frequency Response Zoomed Out Channel...

Page 88: ...88 N2820 1A User s Guide 6 Performance Data Plots N2820A Common Mode Rejection Ratio N2820A Common Mode Rejection Ratio Figure 43 Common Mode Rejection Ratio CMRR...

Page 89: ...ponse N2820 1A User s Guide 89 N2820A Step Response Zoomed In Channel 10 90 rising edge step 584 2 ns 20 80 rising edge step 365 8 ns Zoomed Out Channel 10 90 rising edge step 96 76 ns 20 80 rising ed...

Page 90: ...Performance Data Plots N2820A Step Tracking N2820A Step Tracking Input Step 10 90 Rise Time 1 688 s 20 80 Rise Time 1 153 s Output Step 10 90 Rise Time 1 769 s 20 80 Rise Time 1 204 s Figure 45 Zoome...

Page 91: ...lots 6 N2820A Step Tracking N2820 1A User s Guide 91 Input Step 10 90 Rise Time 446 9 ns 20 80 Rise Time 299 8 ns Output Step 10 90 Rise Time 450 0 ns 20 80 Rise Time 302 6 ns Figure 46 Zoomed Out Cha...

Page 92: ...92 N2820 1A User s Guide 6 Performance Data Plots N2820A Input Impedance N2820A Input Impedance Figure 47 Input Impedance...

Page 93: ...Performance Data Plots 6 Input Load Model N2820 1A User s Guide 93 Input Load Model Zin Single Ended 1 5 G Zin Differential 3 G Figure 48 Input Load Model...

Page 94: ...94 N2820 1A User s Guide 6 Performance Data Plots Input Load Model...

Page 95: ...his chapter is listed as Gain in Table 10 Characteristics and Specifications on page 75 NOTE The performance measured in this procedure is for the probe by itself Keysight high performance real time s...

Page 96: ...ment Recommended Model Digital Multimeter General purpose instrument for DC voltage measurement DC Power Supply Recommended 20V Maximum 35V Probe Power Supply Keysight 1143A Probe Offset Control and P...

Page 97: ...825A head onto the N2820 1A probe and connect the test equipment as shown in Figure 49 Be sure to connect the positive side of the DC supply to the red lead on the N2825A head Figure 49 Test Setup for...

Page 98: ...________________ 4 Move the multimeter s leads to the banana plug on the output of the N1022A B as shown in Figure 50 5 Record the value of Vout measured on the multimeter Vout ________________ Figur...

Page 99: ...onnect the multimeter s leads to the banana plug on the output of the N1022A B as shown in Figure 50 on page 98 11 Record the value of Vout measured on the multimeter Vout ________________ 12 Calculat...

Page 100: ...Performance Verification Average Gain of Zoomed In Channel average gain zoomed in ________________ 14 The average gain zoomed in should be 300 3 Enter the value in Table 14 on page 105 average gain po...

Page 101: ...head onto the N2820 1A probe and connect the test equipment as shown in Figure 51 Be sure to connect the positive side of the DC supply to the red lead on the N2825A head Figure 51 Test Setup for Mea...

Page 102: ...________________ 4 Move the multimeter s leads to the banana plug on the output of the N1022A B as shown in Figure 52 5 Record the value of Vout measured on the multimeter Vout ________________ Figur...

Page 103: ...onnect the multimeter s leads to the banana plug on the output of the N1022A B as shown in Figure 52 on page 102 11 Record the value of Vout measured on the multimeter Vout ________________ 12 Calcula...

Page 104: ...ormance Verification Average Gain of Zoomed Out Channel average gain zoomed out ________________ 14 The average gain zoomed out should be 1 97 3 Enter the value gain in Table 14 on page 105 average ga...

Page 105: ...10 Characteristics and Specifications on page 75 Table 14 N2820 1A Performance Test Record Model Date Tested by Recommended next test date Recommended Test Interval 1 year 2000 hours Probe Amplifier...

Page 106: ...106 N2820 1A User s Guide 7 Performance Verification Performance Test Record...

Page 107: ...ng 12 K Keysight Technologies contacting 13 L leads 22 23 M make before break connector 9 maximum power dissipation 20 MBB connector 39 MBB header 10 Gerber file 43 MBB receptacle 10 Meas key 35 measu...

Page 108: ...3 RSENSE resistors 5 R Sense softkey 29 53 64 S safety 15 Safety Considerations 15 safety warnings 15 secondary cable 11 26 connecting 25 sensor leads 11 socket 10 socketed lead 39 specifications 75 T...

Page 109: ...N2820 1A User s Guide 109...

Page 110: ...This information is subject to change without notice Keysight Technologies 2018 March 2018 N2820 97006 www keysight com...

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