3.5 Basic Operations
3-62 ZM2376
3.5.6.9 LOAD Correction
The LOAD correction corrects the measurement error caused by the connection circuit network
between the measurement terminals and DUT, based on a standard with a known value. To execute
more accurate correction, use a standard with an impedance as close to that of DUT as possible.
The LOAD correction is always executed together with the OPEN and SHORT corrections.
Assuming that the circuit is a linear 2-terminal-pair circuit network, the error caused by the
connection circuit network can be removed by executing the OPEN, SHORT, and LOAD corrections.
The LOAD correction also has the effect of reducing a small error which occurs under certain
conditions of frequency, signal level, measurement range, and so on. However, if the expected model
differs from the actual model, the error may be rather increased.
The OPEN correction value, the SHORT correction value, and the LOAD correction value can be
measured as often as needed in an arbitrary order. It is also possible to change the LOAD standard
value later.
Cable length
Figure 3-10 Connection circuit network for LOAD correction
Typical LOAD correction procedures are described below.
2-terminal-pair
circuit network
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