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data sheet keysight technologies precisionprobe for bandwidths up to 33 ghz
precisionprobe solves measurement challenges by allowing you to: C measure input impedance and response of any probe and the loss of any cable C quickly correct for probe and cable loss (without extra instruments s uch as vna or tdr) C correct probing issues such as phase non-linearity, magnitude non- flatness, and see the effect of probe loading C quickly gain insight into the impedance/capacitance that defines y our connection the keysight technologies, inc. precisionprobe software (N2809A) all ows you to characterize and correct your measurement system quickly and accurately, up to 33 ghz of ban dwidth without adding expensive equipment. introduction
03 | keysight | precisionprobe for bandwidths up to 33 ghz - data sheet probes and cables have inherent loss and variation. the loss at times can be substantial, or merely different enough from the nominal to cause variation in measurements. to compensate for the inherent loss, oscilloscope vendors use probe correction via dsp. the vendor uses a ?golden? model and base, all compensation/correction on the single model. while this strategy solves some of the loss and variability, it also still means that if a probe?s characteristics have changed/drifted or were not close to the model to begin with, the compensation is no longer correct for the probe. there are also a myriad of probe heads to attach to probe amplifiers for maximum accuracy when every combination must be measured. the end result is that you can get unwanted inaccuracies or probe to probe variability. you also use custom probes and probe heads. while this provides great convenience for you it means that the oscilloscope vendor no longer can even provide a ?golden? system. meaning that custom probes are uncorrected and inaccurate, but convenient. you may also want to add something between the probe amplifier (such as keysight?s 30 ghz n2803a) probe amplifier and (such as keysight?s 30 ghz n5444a browser probe head), including a cable to add length or a switch matrix. this adds inaccuracies as the probe amplifier and browser head are compensated to the model, the newly created probe now has no model. the result is that you must except the inaccuracies that have been added or try to characterize the additional element in the probe link. while accepting both of these trade-offs can be sufficient, it is time consuming to evaluate the element every time and not characterizing the element causes loss of mar- gins (including higher jitter, smaller eyes, and slower rise times). this can also be the cause of differences between numbers measured in simulation and the number actually achieved in actual measurements. background C precisionprobe figure 1: probe browser with a non-standard pitch figure 2: image of custom probe figure 3: image using lw zif head
04 | keysight | precisionprobe for bandwidths up to 33 ghz - data sheet background C precisionprobe (continued) cables pose many of the same problems as probes with ca- ble-to-cable variability. oscilloscope vendors now mitigate this problem with the use of de-embedding software (key- sight?s infiniisim n5465a software). typically for cables, you must characterize the cable using either a tdr or a vna. both of these methods provide characterization and s-parameters, but take time. it is the time required that typ- ically will mean that you will characterize only one or two cables, and use that characterization (s-parameter file) to do the measurements of every similar cable they own, causing cable-to-cable variability if the cables characteristics vary from the ?golden? cable. precisionprobe precisionpr obe can solve the problems outlined in the back - ground information by allowing quick characterization of your entire probe system (including cables and switches). the innovative software takes advantage of the fast ?cal output? signal on the 90000 q-series, 90000 x-series, and 90000a series oscilloscopes to properly characterize cables and probes. the software quickly (less than five minutes in most cases) and accurately characterizes the desired element in the system without adding more equipment. precisionprobe ? characterizes probe input impedance ? properly creates custom probe transfer function = vout / vin or vout/vinc = vout/vsrc ? removes unwanted cable loss now every probe and cable in the system can have the exact same response probe to probe or cable to cable, without the inaccuraies that using one model can produce. custom probes can now be properly characterized and unwanted responses can be removed. not only does precisionprobe characterize the cables, it allows for immediate use on the same instrument. when combining precisionprobe with the 90000 q-series, 90000 x-series, and 90000a series oscilloscopes one can char- acterize their measuring system and be using it within five minutes without adding more complicated, expensive equipment. precisionprobe saves time and money while increasing accuracy. when combining infiniimax probes with switches between the amplifier and the probe head, precisionprobe allows for full correction and automation of each probes path. full automation is then available to allow for quick swapping of the inputs. figure 4: eye diagram with no correction, notice the minimized eye margins due to fixture loss figure 5: same setup using precisioncable correction to compensate for fixture loss
05 | keysight | precisionprobe for bandwidths up to 33 ghz - data sheet vout/vsource correction the second way to correct probes is an estimate known as vout/vsource, this method corrects the probe as ?what would be there if the probe were not present.? there are oscilloscope and probe manufacturers that design their probes and dsp correction software to display what the waveform ?would have been? in the absence of the probe. one drawback of defining the probe?s response in this manner is that if the probe?s loading causes your circuit to lose some timing or amplitude margin, you probably want to know that when you make a measurement. vout/vsource compensation will hide these effects from you. precision - probe also gives you the freedom to choose this method of correction, which can be effective if probing at the transmitter. vout/vin correction vout/vin characterizes the output of the probe as a func- tion of the input at the probe tips. defining the response this way allows you to evaluate the probe?s accuracy in reproducing the actual signal present in your system with the probe attached. this correction is known as vout/vin, which is what you?d see with a real band limited probe that has finite input impedance. precisionprobe corrects the ?vout/vin? response to be flat with frequency and phase to your defined bandwidth limit. it does not correct the loading effects of the probe. it should be noted that keysight? s probe frequency response corrections are typically defined using vout/vin. figure 6: a probe that has perfect transfer function shows an exact copy of a sig nal at the input. a probe that has a perfect system re- sponse shows the signal at the input of probe boosted by the estimate amount of l oading due to the probe. precisionprobe correction two methods exist for correcting probe responses, vout/vin and vout/v source
06 | keysight | precisionprobe for bandwidths up to 33 ghz - data sheet precisioncable correction s21 insertion loss correction precisioncable can be used to remove insertion loss caused by cables and fixtures up to 33 ghz. previously the only way to do this analysis was to characterize the cable using simulation, tdr, or a vna. all of these methods can be accurate and can yield the desired results. you would then take the newly created s-parameter file to the oscillo- scope and use the de-embedding software to remove the insertion loss of the fixture or cable. while this method works, it requires extra equipment and effort. precision cable allows for this characterization to be done inside of the same oscilloscope that the measurements will be taken. characterizing the cables and fixtures takes less than five minutes in many cases which saves significant time. note: this measurement does require access to both ends of the fixture or cable, similar to methods such as vna and tdr. figure 7: e.xample of frequency response correction of a cable. the 3 db down point moved from 1 ghz to 4 ghz . figure 8: precisionprobe corrects phase non-linearities, notice t he new flat phase.
07 | keysight | precisionprobe for bandwidths up to 33 ghz - data sheet analysis tools precisionprobe provides many tools to allow you to know exactly what has be en characterized and what parameters have been improved by the innovative software. precisionprobe wizard precisionprobe provides an easy to follow guide with its wizard. the wizard takes you step by step through the set up of the software and ensures that your measurements are taken with the highest signal integrity. probe correction to maximize margins it is important to correct each probe identically and to ensure the correction method is the same. the probe correction menu allows you to change between vout/vin and vout/vsource. precisionprobe also allows for the source impedance via s-parameter file or an estimate. this is important when measuring vout/vsource to ensure a high level of accuracy as assuming an ideal 50 ohm environment can cause unwanted errors. figure 9: starting the precisionprobe wizard figure 10: choosing the probe correction that you need bandwidth control software such as precisionprobe can amplify high frequen- cy noise when correcting for the loss of a probe or cable. the high frequency noise can then cause unwanted noise and inaccuracies. bandwidth control allows you to remove unwanted high frequency noise by providing a filter. precisionprobe also provides the ability to control the amount of gain that is applied to the signal. you can increase the amount of boosting which improves risetimes but also increases noise, or you can decrease the amount of boosting which decreases noise but degrades rise times. figure 11: use bandwidth control to maximize margins
08 | keysight | precisionprobe for bandwidths up to 33 ghz - data sheet understanding the analysis charts precisionprobe comes with many analysis charts that make understand ing the characterization and correction very easy and provide insight that is unique to keysight oscilloscopes. the summary chart the summary chart shows the frequency response of the corrected probe or vout (notice how flat the response is). the chart also shows the transfer function (tf) that is applied to the signal. probe input impedance knowing the impedance profile of the probe allows you to estimate the loading of the probe system. precisionprobe allows for you to characterize the impedance profile, along with quickly determining the capacitance, impedance and inductance. markers allow for easy viewing of the capaci- tance and inductance at each frequency probe correction filter the probe correction filter simply shows the filter that is being applied to adjust for the probe. this filter is designed to ensure the signal stays perfectly flat. figure 12: the summary chart figure 13: precisionprobe properly characterizes a 2 pf capacitor figure 14: probe correction summary
09 | keysight | precisionprobe for bandwidths up to 33 ghz - data sheet conclusion using precisionprobe provides the highest level of accuracy without r equiring additional equipment. precisionprobe will help with accuracy in the following ways: ? characterize the impedance of your probe ? remove probe to probe variation ? remo ve insertion loss caused by cables ? correct custom probes ? cor rect for browser variability caused by span and length variation ? correc t for solutions such as switch matrices figure 15: real time eye with uncorrected cable loss figure 16: real time ey e with corrected cable using precisionprobe need precisionprobe for bandwidths >33 ghz? the n2807a precisionprobe advanced kit allows for full characterization and insertion loss removal of cables, probes, and other circuit elements to 63 ghz of bandwidth high bandwidth is enabled by keysight?s n2806a cali - bration pulse generator, included in the precisionprobe advanced kit, capable of producing rise-times of less than 7 ps. using this external hardware the ?cal out? edge of the oscilloscope can be accelerated to speeds necessary to characterize and remove insertion loss at > 60 ghz measurement bandwidth using the same precisionprobe software. see the product page for the n2807a for more details at: www.keysight.com/find/ppa
10 | keysight | precisionprobe for bandwidths up to 33 ghz - data sheet ordering information option standalone dso 90000 x-series dsox90000-001 N2809A-001 dso90000a dso90000-001 N2809A-002 dso9000a none none N2809A-001 or dsox90000-001 quantity N2809A-002 or dso90000-001 quantity description n2812a cables 3 n2812a cables 3 high performance input cable ? 3.5mm ? 1m 5061-5311 2 5061-5311 2 connector assembly - 3.5 mm female to female 11636b-fg 1 dc to 26.5 ghz power divider included equipment recommended equipment N2809A-001 or dsox90000-001 quantity N2809A-002 or dso90000 -001 quantity description n5443a 1 e2655b 1 performance verification and deskew fixture n2787a 1 n2787a 1 3-d probe positioner 54855-67604 2 precision bnc adaptor keysight technologies oscilloscopes multiple form factors from 20 mhz to >90 ghz | industry leading specs | powerful a pplications
11 | keysight | precisionprobe for bandwidths up to 33 ghz - data sheet this information is subject to change without notice.? keysight technologies, 2012 - 2014 published in usa, september 24, 2014 5990-7940en www.keysight.com mykeysight www.keysight.com/find/mykeysighta personalized view into the information most relevant to you. www.axiestandard.org advancedtca ? extensions for instrumentation and test (axie) is an open standard that extends the advancedtca for general purpose and semiconductor test. keysight is a founding member of the axie consortium. atca ? , advancedtca ? , and the atca logo are registered us trademarks of the pci industrial computer manufacturers group. www.lxistandard.org lan extensions for instruments puts the power of ethernet and the web inside your test systems. keysight is a founding member of the lxi consortium. www.pxisa.org pci extensions for instrumentation (pxi) modular instrumentation delivers a rugged, pc-based high-performance measurement and automation system. three-year warranty www.keysight.com/find/threeyearwarrantykeysights commitment to superior product quality and lower total cost of ownership. the only test and measurement company with three-year warranty standard on all instruments, worldwide. keysight assurance plans www.keysight.com/find/assuranceplansup to five years of protection and no budgetary surprises to ensure your instruments are operating to specification so you can rely on accurate measurements. www.keysight.com/go/quality keysight technologies, inc. dekra certified iso 9001:2008 quality management system keysight channel partners www.keysight.com/find/channelpartners get the best of both worlds: keysights measurement expertise and product breadth, combined with channel partner convenience. for more information on keysight technologies products, applications or services, please contact your local keysight office. the complete list is available at: www.keysight.com/find/contactus americas canada (877) 894 4414 brazil 55 11 3351 7010 mexico 001 800 254 2440 united states (800) 829 4444 asia paciic australia 1 800 629 485 china 800 810 0189 hong kong 800 938 693 india 1 800 112 929 japan 0120 (421) 345 korea 080 769 0800 malaysia 1 800 888 848 singapore 1 800 375 8100 taiwan 0800 047 866 other ap countries (65) 6375 8100 europe & middle east austria 0800 001122 belgium 0800 58580 finland 0800 523252 france 0805 980333 germany 0800 6270999 ireland 1800 832700 israel 1 809 343051 italy 800 599100 luxembourg +32 800 58580 netherlands 0800 0233200 russia 8800 5009286 spain 800 000154 sweden 0200 882255 switzerland 0800 805353 opt. 1 (de)opt. 2 (fr) opt. 3 (it) united kingdom 0800 0260637 for other unlisted countries: www.keysight.com/find/contactus (bp-09-23-14)

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