Keysight N2807B N2807a precisionprobe advanced kit Datasheet

Keysight Technologies
N2807A PrecisionProbe Advanced Kit
Data Sheet
PrecisionProbe solves measurement challenges by
allowing you to:
– Measure input impedance and response of any probe and the loss of any cable
– Quickly correct for probe and cable loss (without extra instruments such as VNA or
TDR)
– Correct probing issues such as phase non-linearity, magnitude non-flatness, and see
the effect of probe loading
– Quickly gain insight into the impedance/capacitance that defines your connection
The Keysight Technologies, Inc. PrecisionProbe Advanced Kit (N2807A) includes
award winning PrecisionProbe software as well as external hardware and
accessories that allow you to characterize and correct your measurement system
quickly and accurately to 63 GHz.
Background – PrecisionProbe
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 myriad 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.
Figure 1. Probe browser with a nonstandard pitch
Figure 2. Image of custom probe
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Custom probe heads provide great convenience, but prevent Oscilloscope vendors from
providing a “golden” model to correct for probe loss. The result is uncorrected and
inaccurate probes in your measurement system.
You may also want to add something between the probe amplifier (such as Keysight’s
30 GHz N2803A) probe amplifier and probe head (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 accept 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 margins (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 achieved in actual measurements.
Figure 3. Image using LW ZIF Head
Cables pose many of the same problems as probes with cable-to-cable variability.
Oscilloscope vendors now mitigate this problem with the use of de-embedding
software (Keysight’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 typically 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 characteristics vary from
the “golden” cable.
PrecisionProbe
PrecisionProbe can solve the problems outlined in the background information by
allowing quick characterization 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 out to 33 GHz of bandwidth. For measurements
greater than 33 GHz, the PrecisionProbe Advanced Kit includes Keysight’s N2806A
Calibration Pulse Generator to accelerate the “cal output” edge to sub-7 ps rise
times. This edge speed allows for PrecisionProbe characterization out to 63 GHz.
3
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
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 characterize
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
probe’s path. Full automation is then available to allow for quick swapping of the
inputs.
4
PrecisionProbe Correction
Two methods exist for correcting probe responses, Vout/Vin
and Vout/Vsource
Vout/Vin Correction
Vout/Vin characterizes the output of the probe as a function 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.
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.
PrecisionProbe also gives you the freedom to choose this method of correction,
which can be effective if probing at the transmitter.
Figure 6. A probe that has perfect transfer
function shows an exact copy of a signal at
the input. A probe that has a perfect system
response shows the signal at the input of
probe boosted by the estimate amount of
loading due to the probe.
5
Figure 7. Example of frequency response
correction of a cable. The 3dB down point
moved from 21 GHz to 62 GHz.
S21 Insertion Loss Correction
Note: This measurement does require
access to both ends of the fixture or cable,
similar to methods such as VNA and TDR.
Figure 8. PrecisionProbe corrects phase
non-linearities, notice the new flat phase.
6
PrecisionCable can be used to remove insertion loss caused by cables or fixtures.
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 oscilloscope 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. PrecisionCable 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.
Analysis Tools
PrecisionProbe provides many tools to allow you to know exactly what has
been 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.
Figure 9. Starting the PrecisionProbe wizard
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 10. Choosing the probe correction
that you need
Bandwidth Control
Software such as PrecisionProbe can amplify high frequency 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
7
Understanding the Analysis Charts
PrecisionProbe comes with many analysis charts that make understanding 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.
Figure 12. The summary chart
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 capacitance and inductance at
each frequency.
Figure 13. PrecisionProbe properly
characterizes a 2 pF capacitor
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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 14. Probe correction summary
Highlights
Keysight N2806A Calibration Pulse Generator
Included hardware in the N2807A PrecisionProbe Advance Kit
– Sub-7 ps fall time & sub-9 ps rise time give you frequency content beyond 63 GHz for
your high bandwidth applications.
– Fully differential output allows you to utilize both the rising and falling edges simultaneously, perfect for differential step response and TDR.
– Output rep rates up to 45 GHz – buffer any serial data stream to accelerate edge speed
to sub-9 ps and eliminate amplitude variations due to ISI.
– Features a step response with the lowest noise and closest to ideal spectral content
available, critical for demanding calibration and metrology applications.
– Trigger on internal or externally sourced signals.
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Conclusion
Using PrecisionProbe provides the highest level of accuracy without requiring
additional equipment. PrecisionProbe will help with accuracy in the following
ways:
–
–
–
–
–
–
Characterize the impedance of your probe
Remove probe to probe variation
Remove insertion loss caused by cables
Correct custom probes
Correct for browser variability caused by span and length variation
Correct for solutions such as switch matrices
The N2807A PrecisionProbe Advanced Kit provides the same award winning
software and features as the original PrecisionProbe (N2809A). While the original
PrecisionProbe was limited to a maximum of 33 GHz characterization bandwidth,
PrecisionProbe Advanced extends this functionality out to 63 GHz by including
Keysight’s N2806A Calibration Pulse Generator.
Figure 15. Real time eye with uncorrected
cable loss
Figure 16. Real time eye with corrected
cable using PrecisionProbe
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Ordering information
DSO/DSA 90000 Q-Series
Option
Stand-alone
DSOX90000Q-827
N2807A
DSO/DSA 90000 X-Series
None
N2807A
DSO/DSA 90000A Series
None
N2807A
Included equipment
Part number
Quantity
Description
N2812A
1
High Performance Input Cable – 2.9 MM – 1 m
N2814A
1
Ultra high bandwidth input cable – 1.85 mm – 1 m
N2806A
1
Calibration Pulse Generator, sub-7 ps edges
PrecisionProbe software license
1
Recommended accessories
Part number
Description
N2812A
High performance input cable – 2.9 mm – 1 m
N2814A
Ultra high bandwidth input cable – 1.85 mm – 1 m
N5443A
Performance veriication and deskew ixture (probes)
N2787A
3-D probes positioner
N5520B
Connector assembly – 1.85 mm female to female
5061-5311
Connector assembly – 3.5 mm female to female
11
Detailed Speciications for Included Hardware:
N2806A Calibration Pulse Generator
Output Parameters
Waveform
Step pulse, square wave, or drive to DC high or low
Rise time 10% - 90% (Warranted)
< 10 ps
Rise time 10% - 90% (Typical)
< 9 ps
Fall time 10% - 90% (Warranted)
< 8 ps
Fall time 10% - 90% (Typical)
< 7 ps
Maximum Square Wave Rep Rate
45 GHz
Output VHI
0V
Output VLO
-500 mV / -1.0 V Selectable
Step Duration
Unlimited time hold at high or low voltage
Overshoot
10%, typical
RF Output Impedances
50 Ohms
RF Trigger Input Parameters
Maximum input voltage
± 700 mV
Minimum Input dV/dt
>2 V/ns
Trigger Threshold
0 V / -250 mV selectable
Input Impedance
50 Ohms
Max Rep Rate
45 GHz
Square Wave Trigger Output (Control Module) Parameters
Output Impedance
50 Ohms
Amplitude
1.0 Vp-p (± 500 mV)
Waveform
Square wave
Fequency
4 MHz
General Speciications
Temperature
Operating: 5 C to 40 C, Non-operating: -40 C to 65 C
Humidity
Operating: up to 95% relative humidity (non-condensing) at 40 C,
Non-operating: up to 90% relative humidity at 65 C.
Altitude
Operating: up to 3,000 meters (9,000 feet), Non-operating: up to 15,300 meters (50,000
feet)
Vibration
Power
100 - 240 VAC at 50/60 Hz: maximum input power 25 Watts
Weight
Dimensions
Remote Head: 3.3 x 2.2 x 0.94 inches, Control Module:
2.16 x 5.4 x 7.75 inches
Safety
ESD HBM
12
>2 kV on remote head RF input , 400 V on remote head RF outputs
Keysight Technologies Oscilloscopes
Multiple form factors from 20 MHz to > 90 GHz | Industry leading specs | Powerful applications
13
14 | Keysight | N2807A PrecisionProbe Advanced Kit - Data Sheet
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