Technical data

Channel Commands 12
Agilent Infiniium 9000 Series Oscilloscopes Programmer's Reference 239
:CHANnel<N>:PROBe:PRECprobe:ZSRC
Command :CHANnel<N>:PROBe:PRECprobe:ZSRC {VIN | {VSRC, <impedance>}
| {VSRC, <file_string>}}
The :CHANnel<N>:PROBe:PRECprobe:ZSRC command specifies how
PrecisionProbe characterizes the time domain and frequency domain
response.
<N> An integer, 1-4.
VIN Selects the VOut/Vin probe transfer function (which characterizes the
output of the probe as a function of the input at the probe tips).
Defining the response this way lets you evaluate the probe's accuracy in
reproducing the actual signal present in your system with the probe
attached. This correction is what you would 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 de- embed the loading effects of the probe.
(Agilent's probe corrections are typically defined using Vout/Vin.)
VSRC,
<impedance>
Selects the VOut/VSrc estimate of probed system response (which corrects
the probe as "what would be there if the probe were not present"), and
specifies a constant (Zo/2) value (in ohms) as the system source
impedance.
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. However, this
method can be effective if probing at the transmitter.
VSRC,
<file_string>
Selects the VOut/VSrc estimate of probed system response (which corrects
the probe as "what would be there if the probe were not present"), and
names an S-parameter file whose S11 is used to specify the system source
impedance.
Example This example, for channel 1, tells PrecisionProbe to use the VOut/VSrc
characterization and to get the system source impedance from S11 in the
"foo.s2p" S-parameter file.
myScope.WriteString ":CHANNEL1:PROBE:PRECprobe:ZSRC VSRC, "foo.s2p""
Query :CHANnel<N>:PROBe:PRECprobe:ZSRC?
The :CHANnel<N>:PROBe:PRECprobe:ZSRC? query returns the current
settings for PrecisionProbe time domain and frequency domain response
characterization.
Returned Format
[:CHANnel<N>:PROBe:PRECprobe:ZSRC] {VIN | {VSRC, <impedance>}
| {VSRC, <file_string>}}<NL>