SARK-110
User’s Manual
Rev 1.2.19 January 12
th
, 2020
- 87 -
© Melchor Varela
– EA4FRB 2011-2020
Appendix D:
OSL Calibration
The SARK-110 provides a calibration procedure to compensate for the stray capacitance and
impedance of the external test fixture, e.g. the extension cable. This should be performed every
time the external test fixture is changed as well as periodically.
Calibration is performed by using a set of calibration plugs consisting of: an
O
pen circuit, a
S
hort circuit and a calibrated
L
oad having the same value as the reference impedance. These
loads are connected sequentially to the end of the test lead as instructed on the screen as
described below.
➢
To set the reference impedance, please refer to
Setup - Z0
in the chapter 2.13.
The place where these loads are connected during the calibration is called the Reference
Plane.
The analyzer performs a series of measurements with these loads, calculating error coefficients
that are stored in a file that is automatically loaded each time the analyzer is run. These error
coefficients are used to correct the measured values. The number of calibration points is fixed to
400.
The frequency range for the calibration can be programmed by the user, allowing setting a
narrower frequency span for higher resolution measurements.
The device supports the storage of up to eight calibration profiles. These profiles can be
associated to different test port adapters or different frequency ranges.
Select
«SETUP»
«Calibration»
«OSL Profile» to set the active calibration profile. The active
profile is shown in the status line; e.g. “P0” for profile 0.