Beschreibung

The Non-invasive Stability Measurement (‘NISM’) software brings the unique stability measurement capability to the Keysight E5061B/E5071C vector network analyzers. The software add-on, available now for new or existing users, allows the instrument to compute the stability margin measurement of opamps, voltage references, voltage regulators, LDOs, switching amplifiers, POLs, input filters and all types of power converters through their output impedance. NISM is an alternative to a Bode plot measurement that allows the user to assess circuit or filter stability even when the control loop is not accessible. NISM determines phase margin from an output impedance measurement. The software guides the user through a few simple steps to obtain the stability margin from a circuit’s output impedance. The measurement results can be saved or printed as with other E5061B measurements.

For the E5071C, one macro is provided since the same macro works with 1 or 2 port impedance measurements. The file is called E5071CNISM.VBA. E5071CNISM.VBA– Works with both the 1-port (S11 reflection) and 2-port (S21 shunt thru) measurements using any combination of the high frequency channels (Ports 1-Port 4). A common mode coaxial transformer may be required when using the E5071C (in order to attenuates the effects of low frequency ground loops when making 2-Port shunt thru impedance measurements). The Picotest J2102B is made for this purpose.

Testing Stability where no one has gone before. Very often you cannot make a Bode plot for a number of reasons. For example, the stability of linear or switching regulators, whose control loops are not exposed externally from the IC, cannot be assessed using a traditional Bode plot test. In those cases, the non-invasive stability margin measurement is the only way to verify stability for these types of circuits. Whether traditional loop breakage is not possible or not, NISM can perform the stability assessment and now the Keysight E5061B has the capability.

Picotest E5071C-NISM   NISM Software for the Keysight E5071C Single-user License*
*Please inquire for the cost of multi-instrument or corporate licenses.