NF ZM2376 - Page 97

3.5 Basic Operations
3-63 ZM2376
 Spot LOAD correction procedure 1 (When the value of the standard is known)
If you only need to execute the correction at a specific frequency and the correct value of the
standard at that frequency is known in advance, perform the following steps to execute the LOAD
correction.
 Enables the spot correction.
 Disables the OPEN correction and the SHORT correction.
 Set the exact value of the standard as the LOAD standard value.
_SHIFT_ + [LOAD] >> SPOT >> Format setting, STD setting
>> EXIT operation
 Connect the standard at the end of the actual connection circuit network and measure the LOAD
correction value.
 Measure
 The LOAD correction is automatically enabled.
 Execute the OPEN correction and the SHORT correction at the end of the actual connection
circuit network.
 Spot LOAD correction procedure 2 (When the value of the standard is unknown)
If you only need to execute the correction at a specific frequency but the correct value of the standard
cannot be obtained, perform the following steps to execute the LOAD correction.
 Enables the spot correction.
 Disables the LOAD correction.
 Execute the OPEN correction and the SHORT correction with a smallest additional error, and
then measure the LOAD standard value with the standard.
 _SHIFT_ + [LOAD] >> STD-Meas
For example, directly connect the standard to the measurement terminals and execute the
measurement. You may use a direct-coupled type test fixture (4-terminal connection type)
attached to a part with stable characteristics as the standard.
 Disables the OPEN correction and the SHORT correction.
 Connect the standard at the end of the actual connection circuit network and measure the LOAD
correction value.
 Measure
 The LOAD correction is automatically enabled.
 Execute the OPEN correction and the SHORT correction again at the end of the actual
connection circuit network.
If the correction is performed correctly, almost the same value is obtained as the direct connection
even when the measurement is executed at the end of the connection circuit network.