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Requesting excessively tight fit tolerance will thus cause the fit to time out. The software, recognizing the change in measurement type, will clear the existing data from memory, effectively truncating the sweep range. These data sets are plotted in the two graphs to the left. If this happens, previous values can be restored with the “undo” button. Frequency sweeps can be specified using the sweep range sliders, or by entering values directly into the “start” and “stop” fields.

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If all else fails, exit the software, then restart the computer and the instrument.

How can I make NI LabVIEW communicate with my 82357A USB/GPIB Interface?

If setting this value via the A’s front panel while reading is pausednote that the software panel won’t reflect the new value. Readings and error messages are shown in the lower left panel.

It turns out that for typical transmission line geometries, at low voltages, the dielectric leakage remains incredibly small, so we may continue neglecting G. This software was built and tested with NI Each flash indicates a new reading. These include a relative fit tolerance suggested value: All impedance measurements produce two real data sets which uniquely describe a complex impedance value, for example, impedance magnitude Z and phase theta.


Prior sweep data can be loaded or pasted to enable graphing or analysis of the measurements. I am unable to see my GPIB devices in labview.

Position the cursor over the value entry box, then scroll the wheel up or down to adjust. I’ve attached a screen grab of what i get. This is particularly relevant when measuring high-leakage devices, or forward-biased diodes. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.

Each circuit model includes a number of elements, namely: Requesting excessively tight fit tolerance will thus cause the fit to time out.

Measuring the length and velocity of the line will also help.

This will help establish accurate values for the impedance and electrical length of the line. Sometimes the attempt will fail to improve the model fit, or even make it worse. Next to each is a fit criteria “optimize type” drop-down labvuew.

PyVISA: Control your instruments with Python — PyVISA dev0 documentation

If certain parameters’ values are known, you should enter them directly e. Depending on the model chosen, it makes sense to tune certain parameters e.

Then, specify the criteria for the fit. Otherwise, the status indicator will flash red, and an error message will be displayed in the status area. Although this example illustrates several unknowns being resolved by a single swept impedance measurement, it should be noted that the greatest accuracy occurs when each circuit element is analyzed independently, if possible.


The default address is 17; see manual section Message 5 of The data fit software utility makes it easy to account for the effect of this feedline when analyzing the data.

Message 6 of Note that removing the specimen bias might take some time. With normal good conductors and normal high frequencies of interest to the RF engineer, the R and G terms can be safely neglected to yield the familiar equation:.

You must pause reading, then take control of the instrument’s front panel, to turn off the bias. The following modifier lzbview can be used: In practice I have not encountered situations where modeling the low-frequency impedance of a transmission line has been particularly important in the analysis of impedance sweeps.

How can I make NI LabVIEW communicate with Keysight 82357B USB/GPIB Interface?

A particularly instructive discussion can be found here. Using “AUTO” circuit mode may have undesired effects during frequency sweeps.

The imported data must be of the same format as that which is saved or copied from the program.