Chapter 4 Performing Calibration
CellAdvisor JD720C Series User
’s Manual
35
Performing 1-port calibration
Measurement modes that need the 1-port calibration are Reflection, DTF, 1 Port Cable Loss,
1 Port Phase, and Smith Chart.
It is recommended that you perform an O-S-L calibration right at the RF Out / Reflection port
of the instrument without using an extension cable in order to minimize a measurement error.
If using an extension cable is inevitable, you need to use a phase stable cable and perform
the O-S-L calibration at the end of the extension cable.
NOTE
If the O-S-L calibration is done at the end of the port extension cable for DTF
measurement, the length of the port extension cable is compensated automatically and is
not included in the distance to the point of discontinuity.
Do not use an unnecessary extension cable or adapter in order to prevent a measurement
error. Bending or moving the extension cable while making a measurement may cause
errors in the measurement.
O-S-L calibration using mechanical Y-Cal kit
The O-S-L calibration must be performed after setting frequencies and connecting an
extension cable.
illustrates a connection setup with using the port extension cable.
Figure 6
Mechanical calibration connection diagram with an extension cable
JD723C/724C
JD725C/726C
Procedure
1
Connect an extension cable, if necessary, to the
RF Out / Reflection
port of the instrument.
2
Connect the
OPEN
standard of the calibration kit to the instrument's the
RF Out / Reflection
port
or to the extension cable if used.
3
Press the
CAL
hard key.
The on-screen instruction appears to guide you through the mechanical O-S-L calibration.
4
Do the following depending on your instrument model and its installed option:
