Keysight Technologies N7020A User Manual
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Keysight Technologies N7020A User Manual

Keysight Technologies N7020A User Manual

Power rail probes
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Keysight N7020A & N7024A
Power Rail Probes
User's Guide

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Summary of Contents for Keysight Technologies N7020A

  • Page 1 Keysight N7020A & N7024A Power Rail Probes User’s Guide...
  • Page 2 FAR and the DFARS and are set forth specifically in writing elsewhere in the EULA. Keysight shall be under no obligation to update, revise or otherwise modify the Software. With respect N7020A and N7024A Power Rail Probes User’s Guide...

  • Page 3: Table Of Contents

    Replacing N7023A Probe Browser Tips / 52 Avoiding Costly Repairs / 53 Common Types of Power Integrity Measurements / 55 Calibrating / 57 N7020A / N7024A Probe’s DC Attenuation/Offset Calibration Using N7022A Main Cable / 58 N7020A and N7024A Power Rail Probes User’s Guide...
  • Page 4 Contents N7020A / N7024A Probe’s DC Attenuation/Offset Calibration Using N7023A Probe Browser / 59 Performance Plots / 61 N7020A Performance Plots / 62 N7020A Input Impedance Equivalent Model / 66 N7024A Performance Plots / 68 N7024A Input Impedance Plots / 70...

  • Page 5: N7020A / N7024A Probes - Overview

    Keysight N7020A and N7024A Power Rail Probes User’s Guide 1 N7020A / N7024A Probes - Overview Introduction Probe Accessories Oscilloscope Compatibility...

  • Page 6: Introduction

    • A large probe offset range. The offset allows small signals (~1 mV), that exist on top of a DC supply, to be centered on an oscilloscope screen for maximum vertical sensitivity. • Low DC loading due to a 50 kΩ input impedance at DC. N7020A and N7024A Power Rail Probes User’s Guide...
  • Page 7 N7020A / N7024A Probes - Overview • Large active signal range in addition to the offset range While the N7020A and N7024A probes have a number of features in common, the N7024A NOTE probe is an extension to the capabilities and performance of the N7020A probe. When compared to the N7020A probe, the N7024A probe provides enhanced features such as: >...
  • Page 8 N7020A / N7024A Probes - Overview Figure 1 Example of Measured Mean Noise at 2 GHz BW: 1.04369 mV Figure 2 Example of Measured Mean Noise at 20 MHz BW: 443.74 mV N7020A and N7024A Power Rail Probes User’s Guide...

  • Page 9: Probe Accessories

    N7020A / N7024A Probes - Overview Probe Accessories Standard Accessories The N7020A and N7024A probes are shipped with the accessories shown in Figure 3 Figure 4 respectively. These standard accessories are described in Table Figure 3 N7020A Probe with Standard Accessories...
  • Page 10 Glass Tube containing Cable Spring-loaded and Color Coding Rigid Probe Tips Rings Micro SMD Clip Ground Lead Wrench Ground Rotating Spring N7021A Pigtail Adapter Cables Figure 4 N7024A Probe with Standard Accessories N7020A and N7024A Power Rail Probes User’s Guide...
  • Page 11 0603 and 0805 SMT parts. NOTE: Though this browser is not shipped as a standard accessory with the N7020A probe, you can order it separately for use with the N7020A probe. N7033A Power Rail Browser based on .047" semi-rigid coax that has ✓...
  • Page 12 “Replacing N7023A Probe Browser Tips" on page 52. Rigid Probe Tips Replaceable probe tips. To know how to replace ✓ ✓ these tips, refer to “Replacing N7023A Probe Browser Tips" on page 52. N7020A and N7024A Power Rail Probes User’s Guide...
  • Page 13 This ensures that you can pick up a probe and immediately know which channel it is connected to without having to track the cable back to the oscilloscope channel input. N7020A and N7024A Power Rail Probes User’s Guide...
  • Page 14 Besides the standard accessories that are shipped with the probes, a number of optional accessories are also available that you can order separately. These optional accessories are shown in this picture and briefly described in Table 2 page 15. N7020A and N7024A Power Rail Probes User’s Guide...
  • Page 15 0.5 mm pitch (1 pair yellow/green) QFP IC-Clips short down to 0.5 mm 0960-2995 pitch (1 pair yellow/green) Ground Lead 15 cm 0960-2906 N4837A 2-leg Probe Positioner N2786-60001 N2786A Micro SMD Clip 1400-3652 N7020A and N7024A Power Rail Probes User’s Guide...

  • Page 16: Oscilloscope Compatibility

    N7020A / N7024A Probes - Overview Oscilloscope Compatibility The N7020A and N7024A probes are designed for Keysight oscilloscopes with 50Ω N OTE AutoProbe-interface channel inputs. The N7020A and N7024A probes are compatible with the Keysight oscilloscopes shown in Table 3 Table 4.
  • Page 17 To download the latest firmware, go to www.keysight.com search for your oscilloscope’s topic. Click on the “Drivers, Firmware & Software” tab. N7020A and N7024A Power Rail Probes User’s Guide...
  • Page 18 N7020A / N7024A Probes - Overview N7020A and N7024A Power Rail Probes User’s Guide...

  • Page 19: General Information

    Keysight N7020A and N7024A Power Rail Probes User’s Guide 2 General Information Inspecting the Probe Handling the Probe Cleaning the Probe Returning the Probe for Service Contacting Keysight Technologies...

  • Page 20: Inspecting The Probe

    Sales Office. If the shipping container is damaged, or the cushioning materials show signs of stress, notify the carrier as well as your Keysight Technologies Sales Office. Keep the shipping materials for the carrier’s inspection. The Keysight Technologies office will arrange for repair or replacement at Keysight Technologies’ option without waiting for claim settlement.

  • Page 21: Handling The Probe

    If the N7022A main cable is damaged, it may cause the N7024A probe to not meet its CAUTION warranted bandwidth specification of 6 GHz. It is recommended to verify the cable using the procedure described in “To verify if the N7022A main cable is damaged" on page 87. N7020A and N7024A Power Rail Probes User’s Guide...

  • Page 22: Cleaning The Probe

    Gently clean the probe with a soft cloth dampened with a mild soap and water solution. Wipe with clean water to remove the detergent and then dry thoroughly with a clean cloth. Make sure that the probe is completely dry before reconnecting it to an oscilloscope. N7020A and N7024A Power Rail Probes User’s Guide...

  • Page 23: Returning The Probe For Service

    If the probe is found to be defective we recommend sending it to an authorized service center for all repair and calibration needs. Perform the following steps before shipping the probe back to Keysight Technologies for service. Contact your nearest Keysight sales office for information on obtaining an RMA number and return address.

  • Page 24: Contacting Keysight Technologies

    • In the Americas, call 1 (800) 829-4444 • In other regions, visit http://www.keysight.com/find/assist • Before returning an instrument for service, you must first call the Call Center at 1 (800) 829-4444. N7020A and N7024A Power Rail Probes User’s Guide...

  • Page 25: Specifications And Characteristics

    3 Specifications and Characteristics N7020A Probe Specifications and Characteristics N7024A Probe Specifications and Characteristics The tables in this chapter list the specifications and characteristics for the N7020A and N7024A probes. All entries included in this chapter are characteristics unless otherwise NOTE noted.

  • Page 26: N7020A Probe Specifications And Characteristics

    Non-operating: 25 – 85% room humidity temperatures up to 31 °C, decreasing linearly to 40% at 50 °C Non-operating: 95% room humidity for temperatures up to 40 °C Pollution Degree Pollution Degree 2 N7020A and N7024A Power Rail Probes User’s Guide...
  • Page 27 Mechanical Characteristics of N7020A Probe and Browsers Description N7020A Probe N7023A Browser N7032A Browser N7033A Browser Weight 50 g 26 g 10 g 10 g Dimensions Figure 5 on page 29 for dimensions. N7020A and N7024A Power Rail Probes User’s Guide...
  • Page 28 Table 8 Safety Specifications of N7020A Power Rail Probe Specification IEC61010-031 For a description of safety markings and symbols on the probe, refer to the chapter “Safety and Regulatory Information" on page 35. N7020A and N7024A Power Rail Probes User’s Guide...
  • Page 29 Specifications and Characteristics N7020A Probe, Browsers, and Cables Dimensions Figure 5 N7020A Probe, Browsers, and Accessory Cables Dimensions N7020A and N7024A Power Rail Probes User’s Guide...

  • Page 30: N7024A Probe Specifications And Characteristics

    Non-operating: 25 – 85% room humidity temperatures up to 31 °C, decreasing linearly to 40% at 50 °C Non-operating: 95% room humidity for temperatures up to 40 °C Pollution Degree Pollution Degree 2 N7020A and N7024A Power Rail Probes User’s Guide...
  • Page 31 ± .6V (1.2Vpp) Probe + Oscilloscope 30% increase in the noise of the connected oscilloscope Noise Ω Output Termination scope input Probe Type Single Ended * Warranted specification. All other characteristics are typical. N7020A and N7024A Power Rail Probes User’s Guide...
  • Page 32 33 for dimensions. Table 12 Safety Specifications of N7024A Probe Specification IEC61010-031 For a description of safety markings and symbols on the probe, refer to the chapter “Safety and Regulatory Information" on page 35. N7020A and N7024A Power Rail Probes User’s Guide...
  • Page 33 Specifications and Characteristics N7024A Probe, Cables, and Browsers Dimensions Figure 6 N7024A Probe, Browsers, and Accessory Cables Dimensions N7020A and N7024A Power Rail Probes User’s Guide...
  • Page 34 Specifications and Characteristics N7020A and N7024A Power Rail Probes User’s Guide...

  • Page 35: Safety And Regulatory Information

    Keysight N7020A and N7024A Power Rail Probes User’s Guide 4 Safety and Regulatory Information These probes have been designed and tested in accordance with accepted industry standards, and have been supplied in a safe condition. Throughout this manual and specifically in this chapter, there are warnings, cautions, and notes that must be followed by the user to ensure safe operation and to maintain the product in a safe condition.
  • Page 36 If you energize the instrument by an auto transformer (for voltage reduction or mains WARNING isolation), the ground pin of the input connector terminal must be connected to the earth terminal of the power source. N7020A and N7024A Power Rail Probes User’s Guide...
  • Page 37 The product is marked with this symbol when it is necessary for the user to refer to the instructions in the documentation. This symbol indicates a risk of electric shock. Refer to this manual for more information. N7020A and N7024A Power Rail Probes User’s Guide...
  • Page 38 Safety and Regulatory Information N7020A and N7024A Power Rail Probes User’s Guide...

  • Page 39: Using The Power Rail Probe

    CAUTION in damage to the probe and to the oscilloscope’s input channel. If the N7020A input is connected to an S-series oscilloscope at vertical settings at or below NOTE 20 mV/div with more than 200 mV of applied offset with no signal on the probe input, the probe output may be indeterminate.
  • Page 40 Using the Power Rail Probe Connect the N7020A probe to a powered-on oscilloscope for at least 20 minutes before any N OTE testing to allow the probe to warm up. Connect the N7024A probe to an oscilloscope that has been powered-on for at least 20 minutes to allow the oscilloscope to warm up before any testing.

  • Page 41: Requirements For Optimum Probe Performance

    Requirements for Optimum Probe Performance Low Source Impedance Required The N7020A and N7024A are designed explicitly for measuring DC power supplies. In order to maintain a flat frequency response across the probe's bandwidth, the DUT must have extremely low source impedance, like that of a power rail.
  • Page 42 (N7020A with N7022A Main Cable) Minimize Probe Ground Impedance for the Best Signal Fidelity The N7020A and N7024A probes are single-ended probes that are designed for measuring small signals riding on large DC voltages. By using the oscilloscope’s offset knob to offset the DC voltage, you can analyze a power rail using maximum vertical sensitivity.
  • Page 43 You can test this by connecting the probe’s ground and signal contacts to the DUT ground. You should not see any significant signal on the oscilloscope’s screen. N7020A and N7024A Power Rail Probes User’s Guide...

  • Page 44: Connecting To The Dut

    Using the Power Rail Probe Connecting to the DUT You can connect the N7020A / N7024A probe to the DUT in a number of ways using various connection accessories shipped with these probes. The following figure illustrates these connection methods and the correct combination of accessories to be used for the most accurate measurements.
  • Page 45 You can achieve the highest bandwidth configuration for the N7024A probe by connecting the N7022A main cable to an RF connector that connects to the DUT’s power rail on a 50Ω line. N7020A and N7024A Power Rail Probes User’s Guide...
  • Page 46 Connect the main cable to the N7021A pigtail cable. Use the supplied SMA adapter or Rotating adapter to connect the two cables. Solder the pigtail cable to the DUT. Rotating adapter used to connect the cables N7020A and N7024A Power Rail Probes User’s Guide...
  • Page 47 To avoid accidentally shorting the circuit via the cable’s exposed ground, place a small CAUTION strip of non-conductive tape onto the board before attaching the coax. To avoid undue stress to the solder joints, tape the cable to the DUT. N7020A and N7024A Power Rail Probes User’s Guide...
  • Page 48 Using the Power Rail Probe Using a Power Rail Browser The following browsers are available for use with the N7020A/N7024A probes. Based on your bandwidth requirements, you can choose the browser that you want to use. Refer to Chapter 3, “Specifications and Characteristics" to know the capabilities of each of these browsers.
  • Page 49 From the set of N7023A browser accessories, choose the accessory that best suits your requirement as per the probing point on the DUT. Connect this accessory to the browser tip as displayed in the figures below. N7020A and N7024A Power Rail Probes User’s Guide...
  • Page 50 However, the longer lead means it has a larger inductance in the ground return path which corresponds to a lower performance than using the ground spring. Ground Lead N7020A and N7024A Power Rail Probes User’s Guide...
  • Page 51 It is a best practice to twist the leads of the dual lead adapter to reduce coupling of external noise into the probe. Dual Lead Micro SMD Clip Adapter N7020A and N7024A Power Rail Probes User’s Guide...

  • Page 52: Replacing N7023A Probe Browser Tips

    Figure 10 Proper Tip Removal Technique You should exercise caution when using these sharp browser tips to avoid personal WARNING injury. N7020A and N7024A Power Rail Probes User’s Guide...

  • Page 53: Avoiding Costly Repairs

    1 MΩ of isolation from ground. Purchase acceptable ESD accessories from your local supplier. These techniques for a static-safe work station should not be used when working on WARNING circuitry with a voltage potential greater than 500 volts. N7020A and N7024A Power Rail Probes User’s Guide...
  • Page 54 Using the Power Rail Probe Figure 11 ESD Workstation N7020A and N7024A Power Rail Probes User’s Guide...

  • Page 55: Common Types Of Power Integrity Measurements

    Using the Power Rail Probe Common Types of Power Integrity Measurements The following are some of the common types of power integrity measurements that you can make using the N7020A / N7024A probe: • Static and dynamic load response. Figure 12 Example of Response to Changing Load •...
  • Page 56 • High frequency transients and noise. • PARD (Periodic and Random Disturbances) such as noise, ripple, and switching transients on power rails. Figure 13 Example of PARD on DC Output • Product electrical validation at extended temperatures. N7020A and N7024A Power Rail Probes User’s Guide...

  • Page 57: Calibrating

    Keysight N7020A and N7024A Power Rail Probes User’s Guide 6 Calibrating N7020A / N7024A Probe’s DC Attenuation/Offset Calibration Using N7022A Main Cable N7020A / N7024A Probe’s DC Attenuation/Offset Calibration Using N7023A Probe Browser Always calibrate the probe before making any critical measurements. A probe calibration removes attenuation errors, offset errors, and timing delays that are introduced by the probe.

  • Page 58: N7020A / N7024A Probe's Dc Attenuation/Offset Calibration Using N7022A Main Cable

    N7020A / N7024A Probe’s DC Attenuation/Offset Calibration Using N7022A Main Cable Turn on the oscilloscope and connect the N7020A / N7024A probe with the N7022A main cable attached to one of the oscilloscope’s input channels. Allow the oscilloscope to warm up for 20 minutes.

  • Page 59: N7020A / N7024A Probe's Dc Attenuation/Offset Calibration Using N7023A Probe Browser

    N7023A Probe Browser Turn on the oscilloscope and connect the N7023A power rail probe browser with the N7020A / N7024A probe attached to one of the oscilloscope’s input channels. Allow the oscilloscope to warm up for 20 minutes. If the oscilloscope needs calibration, perform a user calibration before the probe calibration.
  • Page 60 Calibrating N7020A and N7024A Power Rail Probes User’s Guide...

  • Page 61: Performance Plots

    User’s Guide 7 Performance Plots N7020A Performance Plots N7020A Input Impedance Equivalent Model N7024A Performance Plots N7024A Input Impedance Plots This chapter includes plots that show the characteristic performance and an input impedance model of the N7020A and N7024A probes.

  • Page 62: N7020A Performance Plots

    Performance Plots N7020A Performance Plots The performance characteristic plots in this section are for the N7020A probe with the N7022A main cable attached. Figure 15 Normalized Frequency Response, V , 2.5 GHz BW (N7020A with N7022A Main Cable) N7020A and N7024A Power Rail Probes User’s Guide...
  • Page 63 Performance Plots Figure 16 Frequency Response for Different DUT Impedances (N7020A with N7022A Main Cable) N7020A and N7024A Power Rail Probes User’s Guide...
  • Page 64 Rise Time, Input Step (20/80%): ....... . . 169 ps Rise Time, N7020A with N7022A (10/90%): ......297 ps Rise Time, N7020A with N7022A (20/80%): .
  • Page 65 Performance Plots Figure 18 Input Impedance Versus Frequency, Measured, Modeled (N7020A with N7022A Main Cable) N7020A and N7024A Power Rail Probes User’s Guide...

  • Page 66: N7020A Input Impedance Equivalent Model

    Performance Plots N7020A Input Impedance Equivalent Model The following Netlist is for the N7020A input impedance equivalent model shown Figure 19 on page 67. * source N7020A .EXTERNAL INPUT Vin .EXTERNAL OUTPUT Vout R_R3 GND N01679 590 T_T8 N01635 GND N01646 GND Z0=51.7174 TD=177.789ps T_T4 N01611 GND N01614 GND Z0=50.0323 TD=5.00049ns...
  • Page 67 Performance Plots Figure 19 Input Impedance Equivalent Model N7020A and N7024A Power Rail Probes User’s Guide...

  • Page 68: N7024A Performance Plots

    N7024A probe when used with the N7022A main cable. This is the V response which is indicative of the response seen when probing a very low impedance voltage rail. N7020A and N7024A Power Rail Probes User’s Guide...
  • Page 69 Performance Plots Figure 20 Typical Corrected Frequency Response for the N7022A Main Cable and N7024A Probe Combination N7020A and N7024A Power Rail Probes User’s Guide...

  • Page 70: N7024A Input Impedance Plots

    In this combination, the value of the inductance L is zero. Figure 22 shows the input impedance looking into the N7022A cable. Any added transmission line and/or connection parasitic on the DUT will modify this impedance. N7020A and N7024A Power Rail Probes User’s Guide...
  • Page 71 Performance Plots Figure 22 Input Impedances (Z Modeled and Z Measured) for the N7022A Main Cable and N7024A Probe Combination N7020A and N7024A Power Rail Probes User’s Guide...
  • Page 72 Performance Plots Input Return Loss Plot for N7022A Main Cable and N7024A Probe Combination Figure 23 Input Return Loss Plot for the N7022A Main Cable and N7024A Probe Combina- tion N7020A and N7024A Power Rail Probes User’s Guide...
  • Page 73 In this combination, the value of the inductance L is 1nH. Figure 24 Input Impedances (Z Modeled and Z Measured) for the N7021A Pigtail Cable, N7022A Main Cable, and N7024A Probe Combination N7020A and N7024A Power Rail Probes User’s Guide...
  • Page 74 In this combination, the value of the inductance L is 1.85 nH. Figure 25 Input Impedances (Z Modeled and Z Measured) for the N7032A Browser, N7022A Main Cable, and N7024A Probe Combination N7020A and N7024A Power Rail Probes User’s Guide...
  • Page 75 In this combination, the value of the inductance L is 1.5 nH. Figure 26 Input Impedances (Z Modeled and Z Measured) for the N7033A Browser, N7022A Main Cable, and N7024A Probe Combination N7020A and N7024A Power Rail Probes User’s Guide...
  • Page 76 Performance Plots N7020A and N7024A Power Rail Probes User’s Guide...

  • Page 77: Performance Verification

    Keysight N7020A and N7024A Power Rail Probes User’s Guide 8 Performance Verification DC Input Resistance Performance Verification Bandwidth Performance Verification for N7024A Probe Electrostatic discharge (ESD) can quickly and imperceptibly damage or destroy high CAUTION performance probes, resulting in costly repairs. Always wear a wrist strap when handling...

  • Page 78: Dc Input Resistance Performance Verification

    Performance Verification DC Input Resistance Performance Verification This section provides information to test that the N7020A / N7024A probe meets its warranted DC input resistance, which is 50 kΩ±2%. Allow the N7020A probe to warm up for at least 20 minutes.
  • Page 79 Record the result in Table 14 on page 80. To pass this test the result should be between 49 kΩ and 51 kΩ. Performance Test Record Serial #: Date: Tested by: Recommended Next Test Date: N7020A and N7024A Power Rail Probes User’s Guide...
  • Page 80 Performance Verification Table 14 Input Impedance Test Results Test Limits Result Pass/Fail Ω 50 k ± 2% N7020A and N7024A Power Rail Probes User’s Guide...

  • Page 81: Bandwidth Performance Verification For N7024A Probe

    Choose Control > Default Setup or press the [Default Setup] key on the front panel of the oscilloscope to configure the oscilloscope to its default settings. Connect one end of the calibration coax cable to one of the input channels of the oscilloscope. N7020A and N7024A Power Rail Probes User’s Guide...
  • Page 82 Choose Setup > Math Functions... or Math > Functions..In the Function dialog box, select the tab of the function f1 to define it. From the Function 1 listbox, select Math and then Differentiate. N7020A and N7024A Power Rail Probes User’s Guide...
  • Page 83 Figure 29 Oscilloscope’s user interface as per the functions defined In the f2 display area, set the following for f2: • stop frequency to 10 GHz. • vertical scale to 3dbm/div. N7020A and N7024A Power Rail Probes User’s Guide...
  • Page 84 For ease of comparison, drag the memory 1 trace into the same window as the f2 trace. Close the window that was initially displayed for memory 1. Figure 30 Frequency response of the Cal Out step through the attached coax cable N7020A and N7024A Power Rail Probes User’s Guide...
  • Page 85 In the Probe Head block, click Select Head..Select Generic:User Cable to configure the oscilloscope to not consider any loss from the N7022A main cable or any probe browsers. Click OK and close the dialog. N7020A and N7024A Power Rail Probes User’s Guide...
  • Page 86 Notice that in the figure below, the N7024A probe passed the bandwidth verification test as the frequency response of the probe s not above 3db at 6 GHz or below. Figure 32 Frequency response of the N7024A probe N7020A and N7024A Power Rail Probes User’s Guide...
  • Page 87 Procedure From the hardware setup used in the N7024A bandwidth verification test (Figure 31), disconnect the calibration coax cable from the N7024A probe. N7020A and N7024A Power Rail Probes User’s Guide...
  • Page 88 The f2 trace now has the frequency response with the N7024A probe attached to the N7022A main cable. The already saved and displayed memory 1 trace has the frequency response of the coax test cable. See Figure N7020A and N7024A Power Rail Probes User’s Guide...
  • Page 89 GHz or below but the f2 trace is clearly different from the f2 trace displayed in the sample figure below. Figure 34 Frequency response of the N7024A probe with the N7022A main cable N7020A and N7024A Power Rail Probes User’s Guide...
  • Page 90 Performance Verification N7020A and N7024A Power Rail Probes User’s Guide...
  • Page 91 27, cable care, environmental specifications, 26, cleaning, grounding, inspecting, service, grounding probe, Probe Calibration dialog box, probe tips, humidity, 26, repair, resistance testing, returning for service, input impedance model, N7020A and N7024A Power Rail Probes User’s Guide...
  • Page 92 Index N7020A and N7024A Power Rail Probes User’s Guide...

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