High Performance Oscilloscope Best Practices
Contents
1. DVD or CDs Use these instructions at your earliest opportunity to make CDs or a DVD of the OS Restore software and keep the back up media in a location in which it will be easily locatable by authorized users of the instrument If the instructions are lost contact Tektronix Technical Support for assistance Updates to Firmware and Applications Regularly check for updates to the instrument firmware and applications of your Tektronix products For example updates for the DPO DSA70000 are available for downloading on the Tektronix com website using the following link http www2 tek com cmswpt swfinder lotr cn dpodsa 70000 amp Ilc EN Windows Applications and Hard Drive Maintenance The Windows oscilloscope is highly specialized to execute the oscilloscope application that is its primary function It also provides the capability to run other Windows compatible applications in the Windows Desktop Some 3rd Party i e non Tektronix applications are included with the Windows oscilloscope for the convenience of its owners such as CD creation and or Virus Scan programs Caution should be taken when adding new 3rd Party programs to the Windows oscilloscope so that it will not interfere with the operation of primary oscilloscope application and its Supporting software architecture The same practices that are recommended for maintenance of personal computer hard drives also apply to maintenance of the Windows oscilloscope local hard drive Defrag the2. HD semi annually or more often depending on how much data is stored on it Windows Shut Down Procedures The Windows oscilloscopes have specialized shut down procedures that assure the integrity of its system structure and data when turning the instrument off Use the Windows Shutdown command in the oscilloscope application s File menu or the Turn Off Computer command in the Start menu when turning off the instrument Avoid abrupt shut downs caused by pressing the On Off button down for 5 seconds or removing the power cable Allow the instrument to complete its Start up routine before turning it off Do not power down the instrument before the Windows system is fully loaded and running as this action will harm the Windows System files Tektronix 4 Best Practices Enabling Innovation High Performance Oscilloscopes DPO7000 and DPO DSA 70000 Series Taking Acquisitions and Measurements Suggestions for best practices when making measurements include e Make sure cables are capable of the bandwidth that is being measured e Torque SMA connectors to 8 in lbs for proper power measurements e Tighten the screw on high bandwidth probes and the TCA 292 to avoid connector float disturbing the signal e Push Default Setup to begin from a known state when configuring the instrument for the acquisition e Verify the signal is properly characterized by using the highest Horizontal Resolution possible e Verify that the signal is maximi
3. earth ground without saturating the probe input circuitry See Figure 1 A common mode voltage that exceeds the operating voltage window may produce an erroneous output waveform even when the differential mode specification is met P7513 amp P7516 P7520 Vv 40 V 3 V a0 V 3 2 V 20 V Figure 1 Operating voltage window Offset Voltage Range Differential mode P7513 P7516 P7520 1 5 V to 2 5 V Single Ended and Common mode ground referenced P7513 P7516 2 0 V to 4 0 V P7520 1 8 V to 3 4 V The Offset Voltage Control accessible from the attached oscilloscope user interface allows the probe dynamic range to be effectively moved up and down within the limits of the offset voltage range and the operating voltage window When the offset voltage is set to zero volts and the input signal is zero volts inputs shorted to ground not open the displayed signal should be zero volts If a noticeable zero volt offset is present under the above conditions a Probe Cal operation should be performed See the P7500 Series Probes Quick Start User Manual Tektronix 6 Best Practices Enabling Innovation High Performance Oscilloscopes DPO7000 and DPO DSA 70000 Series ESD and Probes To avoid ESD damage to the probe always use an antistatic wrist strap and work at a static approved workstation when you handle the probe Soldering To prevent damage to the circuit board or circuit board connections due to a
4. 0 Series Install When both bullets have been removed install new bullets by doing the following Squeeze the tool plunger to extend the holder tangs Insert a new bullet into the tool so that the holder tangs surround the bullet Release the plunger to secure the holder tangs on the bullet Insert the tool into the probe body and seat the bullet in the recess Squeeze the tool plunger to release the bullet Gently pull the tool out of the probe body Repeat for the other bullet Test that the bullets are installed correctly by connecting and then removing an accessory solder tip to the probe head Inspect the probe head and verify that the bullets remain seated in the probe head CON OO BRON Tektronix 9 Best Practices Enabling Innovation High Performance Oscilloscopes DPO7000 and DPO DSA 70000 Series 03 09 JS WWW 81W 23825 1
5. Best Practices High Performance Oscilloscopes DPO7000 DPO DSA70000 and DPO DSA70000B Series Contacting Tektronix Tektronix Inc 14200 SW Karl Braun Drive P O Box 500 Beaverton OR 97077 USA For product information sales service and technical support In North America call 1 800 833 9200 Worldwide visit www tektronix com to find contacts in your area Tektronix 1 Best Practices Enabling Innovation High Performance Oscilloscopes DPO7000 and DPO DSA 70000 Series High Performance Oscilloscope Best Practices Optimizing and maintaining the performance of your Tektronix product is critical to your Success This document provides a summary of Best Practices for using Tektronix DPO7000 and DPO DSA70000 series products Additional technical application and service information is available at www tektronix com General Use Preventing Electrostatic Discharge ESD A CAUTION ESD is a concern when handling any electronic equipment All Tektronix oscilloscopes and probes are designed with robust ESD protection however large discharges of static electricity applied to the signal inputs may damage the equipment A cable that is left unconnected on a bench can develop a very large static charge that can damage the instrument To avoid this source of damage use the following techniques to prevent electrostatic discharge into the instrument e Discharge the static voltage from your body by wearing a grounded antistati
6. c wrist strap when you connect and disconnect cables and adapters Your oscilloscope provides a convenient front panel connection for this purpose OOG CEEA O T E Oe 4 a23 SSRS o TEE D OEO ORE ee ERIE ya C e fy Bl Hat m TO C e Discharge the static charge from any cable before you connect it to the oscilloscope or device under test by momentarily grounding the center conductor of the cable or by connecting a 50 ohm termination to one end prior to attaching the cable to the instrument 50 Q or L 1480 002 Tektronix 2 Best Practices Enabling Innovation High Performance Oscilloscopes DPO7000 and DPO DSA 70000 Series Signal Path Compensation SPC and Instrument Calibration Signal Path Compensation SPC corrects for DC inaccuracies caused by temperature variations or by long term drift Remove all channel input connections and run SPC whenever the ambient temperature of the oscilloscope has changed by more than 5 degrees C or once a week in order to assure that acquisitions are made with a high degree of accuracy It is important to not have any signals applied while SPC is being run Analyze Utilities Help E Tek Secure Erase Set Time amp Date PIB Configuration LAN Server Status External Signals Touch Screen Instrument Calibration k Instrument Diagnostics a E mail on Event F Mi
7. ccidental movement of the probe and soldered leads we recommend that you secure the tip to the circuit board using the adhesive tip tape provided in your accessory kit You can also use other materials such as Kapton tape or hot glue To avoid damage to the tip or the circuit under test avoid applying excessive heat from the soldering iron Use a low wattage temperature controlled soldering iron and appropriately sized soldering iron tip Use the following precautions when you solder the tips For best soldering results use a microscope to examine the quality of the solder joints Use a low wattage temperature controlled soldering iron and a small mass soldering iron tip The soldering iron temperature should be set as low as possible while still providing a reliable solder joint Use SAC305 solder included with the wire replacement kit to attach the tip wires to the circuit under test When replacing tip wires or axial lead resistors solder wick can be used to remove the excess solder from the probe tip circuit board via holes Be careful not to overheat the via and damage the board The attachment wires should be bent symmetrically to vary the interconnect spacing Use care when you solder a tip to a circuit under test to avoid inadvertently desoldering either the attachment wires or the damping resistor For optimum performance and signal integrity keep the lead length between the DUT Device Under Test and the tip as short as po
8. ssible and the lead lengths the same length Tektronix Best Practices Enabling Innovation High Performance Oscilloscopes DPO7000 and DPO DSA 70000 Series Maintenance of Probes The input to the probe body the part of the probe that connects to the various tips was designed with replaceable G3PO RF bullets These RF bullets are similar in function to SMA barrel connectors Since the P7500 Series probes can be used with multiple interchangeable tips there is the possibility of wearing out or damaging the input connector To address this issue the RF bullets are user replaceable The bullet contacts in the probe body should be replaced every 200 insertion cycles For medium use situations this should be about once a year Follow these steps to replace the bullets by using the removal tool Tektronix part number 003 1896 00 Remove 1 Squeeze the tool plunger to extend the holder tangs 2 Insert the tool into the probe body so that the holder tangs surround one of the bullets 3 Release the plunger to secure the holder tangs on the bullet 4 Gently pull the tool outward to remove the bullet 5 Repeat for the other bullet CAUTION If you cannot extract the bullets with the bullet removal tool use fine needle nosed pliers and a magnifying glass or microscope Be careful not to damage the probe body with the pliers Tektronix 8 Best Practices Enabling Innovation High Performance Oscilloscopes DPO7000 and DPO DSA 7000
9. utianronse Hooks Adhere to a regular schedule of calibration of the instrument A Tektronix Calibration Service plan is the most efficient way to ensure specified performance over the lifetime of your Tektronix instrument It also guarantees continuous compliance with international quality and traceability standards Contact your Tektronix Representative or refer to www tektronix com for instrument calibration services Instrument Temperature and Clearance The unit must have 3 inches of clearance on both the left and right sides for proper ventilation The air temperature around the unit must be between 5 and 45 degrees C Deskew Channels Use the Deskew Attenuation control window to compensate for propagation delays of different length probes and to set the input output ratio of any external attenuation or gain between the signal and input channels Deskew relates directly to vertical settings so it is important to deskew at the vertical settings at which measurements will be taken or within the same amplifier range e g 50 99mV 100 200mV Refer to the Online Help of the instrument for documentation of deskew and attenuation procedures Deskew Attenuation Control Window DeskewiAttenuation Gee C Gi D ca 10 E Tektronix 3 Best Practices Enabling Innovation High Performance Oscilloscopes DPO7000 and DPO DSA 70000 Series OS Restore Back up New instrument packaging includes instructions to create an OS Restore
10. zed from the bottom of the screen to the top of the screen e Use the Fine adjust in the Vertical Console controls to get the best resolution e Use constant sample rate if the acquisition should be at full sample rate as the timebase is adjusted e Check the surrounding environment of the oscilloscope for interfering signal sources e Keep lead lengths between the device under test DUT and oscilloscope channel as short as possible e Save waveform data files and screen shots to allow you to go back and verify measuremenis Maximum input voltage DPO DSA70000 B series DPO7000 series 10mV div to 99 5mV div 1V rams 1 MQ 150 V CAT I derate at 20 dB decade to 9 VRMS above 200 kHz 100mV div to 1V div 5Vams 50 Q 5 VRMS with peaks less than 24 V Probing with P7500 Series TriMode Probes Maximum Non Destruct Input Voltage 15 V DC peak AC To avoid damaging the inputs of the probes do not apply more than 15 V DC peak AC between each input or between either probe input and ground Dynamic Range Differential signal range DC coupled P7513 P7516 0 750 V at 5X attenuation 1 75 V at 12 5X attenuation P7520 0 625 V at 5X attenuation 1 60 V at 12 5X attenuation Tektronix 5 Best Practices Enabling Innovation High Performance Oscilloscopes DPO7000 and DPO DSA 70000 Series Operating Voltage Window The operating voltage window defines the maximum voltage that you can apply to each input with respect to
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