Anritsu MS2024A/MS2026A - Calibration; Standard Calibrations; Flexcal Calibration; 1-Port Calibration

Chapter 3 — Vector Network Analyzer 3-3 Calibration - Standard Calibrations
MS20xxA VNA Master UG 10580-00166 Rev. C 3-3
• Selecting the Signal Standard soft key will display the list.
• Use the rotary knob or
Up/Down arrow keys to highlight the desired signal
standard.
• Once highlighted, press
Enter to select the highlighted standard.
The Center Frequency and Span will automatically tune to the first channel of the selected
standard. Press Channel to enter the Channel number for the selected Frequency Standard.
Appendix A contains a table of the signal standards that are available in the instrument
firmware. The Signal Standard table can be edited and custom signal standards can be
defined using Master Software Tools (For detailed information on the signal standard table,
refer to Chapter 13, “Master Software Tools”).
3-3 Calibration
For accurate results, the VNA Master must be calibrated at the ambient temperature after
allowing for warm up time (approximately 15 minutes) and before making any
measurements. The VNA Master must be recalibrated whenever the setup frequency changes
or whenever a test port extension cable is added, removed, or replaced. Refer to “Calibration
Menu” on page 3-27.
The VNA Master offers two modes of calibration:
•Standard
•FlexCal™
Standard Calibrations
Standard calibrations use Open, Short, and Load components to calibrate 551 discrete
frequency points between the current start and stop frequencies. As the VNA Master
performs subsequent measurements, only these 551 frequency points are measured. Any
changes to the frequency settings of the VNA Master will invalidate the calibration. Standard
calibrations provide the most accurate measurement data available.
FlexCal Calibration
For occasions when users need a reasonably accurate measurement with greater flexibility,
VNA Master also offers FlexCal. This calibration method uses the Open, Short and Load
components to calibrate 551 data points across the entire frequency range of the instrument.
By using a FlexCal™, users have the freedom to change frequency settings of the instrument,
allowing the ability to zoom in and take a closer look at items of interest. When data points do
not fall precisely on calibrated frequencies, VNA Master will interpolate between the two
closest data points.
1-Port Calibration
The 1-port calibration is an OSL (open/short/load) calibration that removes source match,
directivity, and frequency response errors.
10580-00166C.book Page 3 Thursday, February 21, 2008 12:52 PM