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Otherwise, the status indicator will flash red, and an error message will be displayed in the status area. 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:. If certain parameters’ values are known, you should enter them directly e. Only linear circuit models are supported. For reference, the manual states that the instrument output resistance can range from Ohms to 11 kOhms, and that the DC bias supply can supply at most 5 or 20 mA depending on configuration. The default address is 17; see manual section VISA io name filtering.

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These include a relative fit tolerance suggested value: For curiosity, you can also select to “show fit progress,” which will update the graphs at each iteration guess of the fitting process. I’ve attached a screen grab of what i get.

These data sets are plotted in the two graphs to the left. Note that removing the specimen bias might take some time.

To effectively disable this model, set the value of f T to a low frequency such as 1 Hz.

Help — HP A Sweep Utility

Does changing the filtering settings enable you to select the alias “generator”. In practice I have labvisw encountered situations where modeling the low-frequency impedance of a transmission line has been particularly important in the analysis of impedance sweeps. Ensure that NI This provides a convenient expression for the transmission line’s characteristic impedance, which I believe to be approximately valid from the lower range of useful frequencies for impedance analysis, through the higher frequencies up to the onset of skin-effect behavior.


If the instrument automatically changes circuit modes during a sweep e. Each flash indicates a new reading. This is especially important for parameters that tend to dominate the model behavior at default values.

To produce the data shown the example screenshot shown below, I connected a capacitor and inductor of unknown value, in parallel, at the far end of labviww unknown length of RG cable.

Message 4 of Prior sweep data can be loaded or pasted to enable graphing or analysis of the measurements.

Message 8 of Message 2 of Depending on the model chosen, it makes sense to tune certain parameters e. I wish to program my AGILENT arbitrary function generator in my labview 8357b and then trigger the generator with one of the digital lines. In these cases, a length of transmission line can be used between the instrument and the unknown circuit.

Instrument Control (GPIB, Serial, VISA, IVI)

Message 9 of It may take several seconds to clear the interface of errors after updating the address. A quick internet search for properties of RG58 cabling suggests that the value of f T for this line should be around 20 kHz. If setting this value via the A’s front panel while reading is pausednote that the software panel won’t reflect the new value. Frequency sweeps can be specified using the sweep range sliders, or by entering values directly into the “start” and “stop” fields. 822357b following modifier keys can be used: Can you post a screen shot of the device in MAX?


For commercial use, please contact me. This is useful, for example, for studying the C-V behavior of a semiconductor p-n junction.

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

The only difference is that the visa resource name box is not blank but has COM1 instead. Skin effect causes the effective resistance of conductors to increase with frequency. For example, make sure that shunt resistances are set to a high value.

It is sometimes inconvenient or impossible to locate the circuit to be tested directly at the A’s test fixture terminals. This is useful for 8237b settings beyond those supported in software, e. A smaller tolerance value, or larger iteration limit, might produce a better fit. It should be noted that the above considerations are at best a first-order approximation; there are numerous other factors that lead to frequency-dependent characteristic impedance of a transmission line.