Specifications

40 Chapter 4
Preparing for Accurate Measurement
Performing Calibration
Step 4. To measure a low-loss capacitor, connect the low-loss capacitor and then issue the
:CORR1:COLL or :CORR1:COLL:RF command, which designates “STAN4” as the
parameter.
Step 5. Connect the OPEN standard for R
dc
measurement and then issue the :CORR1:COLL:DC
command, which designates “STAN1” as the parameter.
Step 6. Connect the SHORT standard for R
dc
measurement and then issue the
:CORR1:COLL:DC command, which designates “STAN2” as the parameter.
Step 7. Connect the LOAD standard for R
dc
measurement and then issue the :CORR1:COLL:DC
command, which designates “STAN3” as the parameter.
Step 8. Issue the :CORR1:COLL:SAVE command.
Preventing operational errors when measuring data for calculating
calibration coefficients
To retrieve each standard’s measurement data for calculating the calibration coefficients
for R
dc
measurement, use the following command:
• :DATA:RCAD{1-3}? on page 265
Since this command returns the R
dc
measurement value for each standard, you can check
whether this value is normal (within the limit range) to prevent operational errors (such as
connecting the wrong standard) that may arise when measuring the data for calculating the
calibration coefficients.
NOTE The measurement data for the standards cannot be used for evaluating slight differences in
measured values because it is raw measurement data that has not been calibrated and may
differ from the specification value. For example, when the LOAD standard is an inductor,
it exhibits an R
dc
value quite similar to that of the SHORT standard; you should be careful
not to inadvertently interchange the LOAD and SHORT standards because they are
difficult to distinguish by their measured values.
The following table provides guidelines for determining the limit range (upper and lower
limits) for testing:
In the table above, Short represents the R
dc
value for the SHORT standard, Load represents
the R
dc
value for the LOAD standard, and Open represents the R
dc
value for the OPEN
standard.
For example, when the LOAD standard is a 50 W resistor, the limit ranges for the
respective standards should typically be the following:
SHORT standard: 25 W or lower
Lower limit (LowerLimit) Upper limit (UpperLimit)
SHORT None
LOAD
OPEN None
UpperLimit Short Load+()2¤=
LowerLimit Short Load+()2¤=
1
UpperLimit
-------------------------------
1
Load
-------------
1
Open
--------------
+
èø
æö
2¤=
1
LowerLimit
-------------------------------
1
Load
-------------
1
Open
--------------
+
èø
æö
2¤=