N2795A/N2796A Single-ended Active Probes User’s Guide © Copyright Agilent Technologies 2010 All Rights Reserved.
Contents Inspecting the Probe ... 3 Cleaning the Probe ... 3 Handling the Probe ... 3 N2795A/N2796A Single-ended Active Probes ... 4 Accessories Supplied with Probe ... 5 Replacement Accessory Kits ... 6 Characteristics and Specifications ... 7 Performance Data Plots ... 9 Safety Information ... 11 Using the N2795A/N2796A Probes ... 12 Dynamic Range and Offset Voltage Limitations ... 14 Dimensions (in millimeters) ... 8 Accessories ...
Inspecting the Probe Inspecting the Probe o Inspect the shipping container for damage. Keep the damaged shipping container or cushioning material until the contents of the shipment have been checked for completeness and the probe has been checked mechanically and electrically. o Check the accessories. • If the contents are incomplete or damaged, notify your Agilent Technologies Sales Office. o Inspect the instrument.
N2795A/N2796A Single-ended Active Probes N2795A/N2796A Single-ended Active Probes The N2795A/96A are a new generation of 1 and 2 GHz single-ended active probes with the AutoProbe interface (compatible with Agilent’s InfiniVision and Infiniium family of oscilloscopes). These probes integrate many of the characteristics needed for today’s general-purpose, high-speed probing - especially in digital system design, component design/characterization, and educational research applications.
Accessories Supplied with Probe Accessories Supplied with Probe The following table shows the standard accessories supplied with the N2795A and N2796A probes. Some of these accessories are discussed in greater detail starting on page 15. The Reference Number for each accesory can be matched to the picture below the table.
Replacement Accessory Kits Replacement Accessory Kits The following table shows the replacement accessory kits available for the N2795A and N2796A probes. Some of these accessories are discussed in greater detail starting on page 15.
Characteristics and Specifications Characteristics and Specifications Characteristics and specifications for the N2795A/N2796A Single-ended Active Probes are shown below. The probe / oscilloscope should be warmed up for at least 20 minutes before any testing and the environmental conditions should not exceed the probe’s specified limits.
Dimensions (in millimeters) Mechanical Characteristics Approximate Weight (probe only) Cable Length 100 g 1.3 m Environmental Specifications Temperature Operating: 0 °C to +50 °C Non-operating: -40 °C to +70 °C Operating: 4,000 m (13,000 ft) Operating: 95% room humidity @ 40 °C Non-operating: 90% room humidity @ 65 °C 8kV HBM Altitude Humidity ESD Dimensions (in millimeters) 1350 100 7.8 12.
Performance Data Plots Performance Data Plots Figure 1 Frequency response of N2796A (Vout/Vin) NOTE: This plot is for the spring/rigid probe tip and an offset ground or ground blade.
Performance Data Plots Figure 2 Input impedance over frequency (red = measured, blue = model) 10
Safety Information Safety Information Warning ! To avoid personal injury and to prevent fire or damage to this product or products connected to it, review and comply with the following safety precautions. Be aware that if you use this probe assembly in a manner not specified, the protection this product provides may be impaired. Handle Probe Tips / Accessories Carefully Some of the probe tips / accessories are very sharp (the spring tips, for example).
Using the N2795A/N2796A Probes Using the N2795A/N2796A Probes Using the Headlight These probes are equipped with two white LED headlights that can be used to illuminate the area around the probe tip. This headlight has a fixed intensity and is turned on/off by pressing the button on the body of the probe (see picture below). Headlights On/Off Button Connecting Accessories The following picture show where you should connect probe tips and grounding accessories to the body of the probe.
Using the N2795A/N2796A Probes Oscilloscope Compatibility The N2795A/N2796A probes are compatibile with the following Agilent oscilloscopes (those with the Agilent AutoProbe Interface): • InfiniiVision 5000 Series, software version 6.10 or higher • InfiniiVision 6000 Series (except 100 MHz model), software version 6.10 or higher • InfiniiVision 7000 Series, software version 6.10 or higher • Infiniium 9000 Series, software version 2.50 or higher • Infiniium 90000 Series, software version 2.
Dynamic Range and Offset Voltage Limitations Dynamic Range and Offset Voltage Limitations With the N2795A/96A active probes offering 16 Vpp (+/-8V) of dynamic range and +/-12V (N2796A) or +/-8V (N2795A) of offset range, the probes have a wide measuring range of +/-20V, allowing them to be used for a wide variety of applications.
Dynamic Range and Offset Voltage Limitations Accessories The following sections describe how to use the N2795A/96A probe accessories. They are placed in order from the most recommended configuration to least recommended (based on bandwidth). The configuration card that ships with the probe also shows these recommended configurations.
Dynamic Range and Offset Voltage Limitations Configurations 1 and 2: Rigid Probe Tips / Spring Probe Tips and Offset Ground / Ground Blade Bandwidth with N2795A: 1 GHz Bandwidth with N2796A: 2 GHz Replacement Kit Part Numbers (the quantities are the amounts shipped in the replacement kits, not the quantity included with the probe): Rigid Probe Tip: 5061-7389 (qty. 2) Spring Probe Tip: 5061-7388 (qty. 2) Ground Blade: 5061-7393 (qty. 2) Offset Ground: 5061-7394 (qty.
Dynamic Range and Offset Voltage Limitations The recommended grounding accessory for the rigid probe tip is the offset ground as shown. Rigid tip Offset ground Both of these configurations are the highest performing for these probes. For more information on recommended configurations, consult the configuration card that shipped with your probe. Warning You should exercise caution when using these sharp probe tips to avoid personal injury.
Dynamic Range and Offset Voltage Limitations Please note this ridge to tell which end is inserted into the probe Rigid probe tip 18
Dynamic Range and Offset Voltage Limitations Configuration 3: Copper Pads with Flex Ground Bandwidth with N2795A: 900 MHz* Bandwidth with N2796A: 1.8 GHz* *Highly dependent on the number of ground connections between the copper pad and the device under test Replacement Kit Part Numbers (the quantities are the amounts shipped in the replacement kits, not the quantity included with the probe): Copper Pads: 0960-2908 (qty. 10) Flex Ground: 5061-7397 (qty.
Dynamic Range and Offset Voltage Limitations Configuration 4: Y-Lead Adapter with 0.1” Headers Bandwidth with N2795A: 750 MHz Bandwidth with N2796A: 1 GHz Replacement Kit Part Numbers (the quantities are the amounts shipped in the replacement kits, not the quantity included with the probe): Y-Lead Adapter: 5061-7392 (qty. 1) The Y-lead adapter offers a convenient and reliable method to connect both the probe signal and ground to probe points on the board or other probe accessories.
Dynamic Range and Offset Voltage Limitations Configuration 5: Flex Nose Clips Bandwidth with N2795A: 500 MHz Bandwidth with N2796A: 500 MHz Replacement Kit Part Numbers (the quantities are the amounts shipped in the replacement kits, not the quantity included with the probe): Y-Lead Adapter: 5061-7392 (qty. 1) Flex Nose Clip (red): 5061-7390 (qty. 1) Flex Nose Clip (black): 5061-7391 (qty. 1) You can use flex nose clips to make connections to components or wires with leads that are 1.01 mm (0.
Configurations 6 and 7: Ground Leads and Right Angle Ground Leads Configurations 6 and 7: Ground Leads and Right Angle Ground Leads Replacement Kit Part Numbers (the quantities are the amounts shipped in the replacement kits, not the quantity included with the probe): 6 cm Ground Lead: 5061-7395 (qty. 2) 12 cm Ground Lead: 5061-7396 (qty. 2) 5 cm Right Angle Ground Lead: 5061-7399 (qty. 2) 10 cm Right Angle Ground Lead: 5061-7400 (qty.
Configurations 6 and 7: Ground Leads and Right Angle Ground Leads Color Coding Rings The color coding rings that can be used to keep track of which probe is connected to which channel input on your oscilloscope. Place one ring on the probe cable near the oscilloscope input and place another ring of the same color near the probe head. 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.
Calibration Testing Procedures Calibration Testing Procedures These procedures are used to test the warranted specifications for the N2795A/N2796A single-ended active probes. The recommended calibration test interval for the N2795A/N2796A is once a year or as required. Use the equipment listed in the “Test Equipment Required” section to complete the Calibration Testing Procedures.
To Test Input Resistance To Test Input Resistance Required Test Equipment Description Digital Multimeter (DMM) Minimum Requirements resistance ± 1% Part Number Agilent 34401A Test Probe Input Resistance 1 Connect the DMM probes between the probe tip and ground at the tip of the probe. 2 Set up the DMM to measure resistance. The resistance should read 1 MW + 0%, -2.5 %. 3 Record the resistance.
To Test Bandwidth To Test Bandwidth This test ensures that the Probe meets its specified bandwidth. N2795A: 1 GHz N2796A: 2 GHz Equipment/Tool Critical Specification Model Number Vector Network Analyzer (VNA) 13 GHz sweep range full 2 port cal Option 1D5 Agilent 8720ES Calibration Standards No Substitute Agilent 85052D External Power Supply No Substitute Agilent 1143A AutoProbe Interface Adapter No Substitute Agilent N1022A Outside thread 3.5 mm (male) to 3.
To Test Bandwidth Initial Setup 1 Turn on the 8720ES VNA and let warm up for 20 minutes. 2 Press the green "Preset" key on the 8720ES VNA. 3 Use the 8720ES VNA's default power setting of 0 dBm. You can locate this feature by pressing the "Power" key on the front panel. 4 Set the 8720ES VNA's averaging to 4. You can find this selection menu by pressing the "AVG" key. Then select the "Averaging Factor" screen key to adjust the averaging. 5 Press the "Sweep Setup" key on the 8720ES VNA.
To Test Bandwidth Calibrating a Reference Plane To get a reliable measurement from the 8720ES VNA we must calibrate a reference plane so that the 8720ES VNA knows where the probe under test is located along the transmission line. 1 Press the "Cal" key on the 8720ES VNA.
To Test Bandwidth 2 Then Press the "cal menu" screen key. 3 Finally, press the "full 2 port" screen key. 4 Connect one of the high quality SMA cables to port one and to the pincher side of PV/DS test board. 5 The calibration reference plane is at the other end of PV/DS test board.
To Test Bandwidth 6 Perform Calibration for the port one side of the Reference plane. • Press the "reflection" screen key • Connect open end of 85052D to the non-pincher side of the PV/DS test board. • Select the "open" screen key under the "Forward" group. • The 8720ES VAN will beep when done. • Connect short end of 85052D to the non-pincher side of the PV/DS test board. • Select "short" screen key under the "Forward" group. • The 8720ES VAN will beep when done.
To Test Bandwidth 7 Connect the other high quality SMA cable to port two of the 8720ES VNA. 8120-4948 Reference plane 8 Get the opposite sex of the 85052D calibration standards for the next step. 9 Perform Calibration for the port two side of the Reference plane. • Press the "reflection" screen key. • Connect open end of 85052D to the available end of the port two SMA cable. • Selec8720ES t the "open" screen key under the "Reverse" group. • The 8720ES VNA will beep when done.
To Test Bandwidth • • • • • • • The 8720ES VNA will beep when done. Connect load end of 85052D to the available end of the port two SMA cable. Select the "loads" screen key the "Reverse" group. Press "broadband" screen key selection. The 8720ES VNA will beep when done. Press the "done loads" screen key. You have just calibrated the other side of the reference plane. 10 Press "standards done" key. 11 Connect port two SMA cable to the non-pincher side of PV/DS test board.
To Test Bandwidth Press the "transmission" screen key. Press the "do both fwd and reverse" screen key. The 8720ES VNA will beep four times when done. Press the "isolation" screen key. Press the "omit isolation" screen key. Press "done 2 port cal" screen key. Set the 8720ES VNA's averaging to off. Save the reference plane cal by pressing the "save recall" key then the "save state" key. 20 You may change name if you wish. 21 Press the "scale reference" key.
To Test Bandwidth Measuring Vin Response 1 Position the probe conveniently to allow the probe tip to be normal to the PV/ DS board. 2 Hold the probe in position, or use a positioner, so that the signal and ground are making contact and are perpendicular to the fixture. Press the "Sweep Setup" key on the 8720ES VNA. Then press the "trigger menu" screen key. Select the "continuous" screen key. 3 You should now have the Vin waveform on screen. 4 Select "display key" then "data->memory" screen key.
To Test Bandwidth Measuring Vout Response 1 Disconnect the port 2 cable from PV/DS test board and attach to probe output 2 3 4 5 6 1 2 3 4 5 on the AutoProbe Adapter. Connect the 85052D cal standard load to PV/DS test board (non-pincher side). Press "scale reference" key on the 8720ES VNA. Set reference value to -20 dB. Hold probe in place as described previously. The display on screen is Vout. Displaying Vout/Vin Response on 8720ES VNA Screen Press the "Display" Key.
To Return the Probe to Agilent Technologies for Service To Return the Probe to Agilent Technologies 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.Follow the following steps before shipping the probe back to Agilent Technologies for service. 1 Contact your nearest Agilent sales office for information on obtaining an RMA number and return address.
Safety Notices This apparatus has been designed and tested in accordance with IEC Publication 1010, Safety Requirements for Measuring Apparatus, and has been supplied in a safe condition. This is a Safety Class I instrument (provided with terminal for protective earthing). Before applying power, verify that the correct safety precautions are taken (see the following warnings). In addition, note the external markings on the instrument that are described under "Safety Symbols.
Notices © Agilent Technologies, Inc. 2010 No part of this manual may be reproduced in any form or by any means (including electronic storage and retrieval or translation into a foreign language) without prior agreement and written consent from Agilent Technologies, Inc. as governed by United States and international copyright laws. Manual Part Number N2795-97000, October 2010 Print History N2795-97000, October 2010 Agilent Technologies, Inc.
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Agilent Technologies, October 2010 Manual Part Number: N2795-97000 Only Available Electronically
