TH2821A OPERATION MANUAL
22
instrument itself. Perform the correction operation again if the
measurement conditions are changed such as test fixture and
environment temperature.
2． It is recommended to perform the open and short correction at
the same time.
3． During short correction period, FAIL (FAIL) will be displayed in the
secondary parameter display area when short correction is failed.
Make sure that the measurement contacts are shorted reliably
and perform the short correction again.
4． TH2821A measures the correction data at all frequency points and
all measurement ranges. The correction data is stored in the
non-volatile memory. So you don’t have to perform the correction
again, if the test conditions are not changed.
5． Open and short corrections are automatically selected by the
instrument according to the impedance value under test. If there
is a component in the fixture or if there is error with the
instrument, Quit (Quit) will be displayed in the secondary
parameter display area.
2. Equivalent Circuit
z Press
u key to select the second function, “SHIFT”
will be lighted on the screen.
z Press EQU key to select the Series or Parallel circuit
mode. (Refer to Figure4-1)
* Note：
1． The actual C, R and L are not the ideal pure C, R and L. Normally
an actual component can be regarded as the combination of an
ideal resistor and an ideal reactor in series or parallel circuit
mode.
2． TH2821A can convert between the two different equivalent
circuit modes using the following equations. The measurement
values of the two different circuit modes maybe different under
different quality factor Q (or dissipation factor D).
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