3.5 Basic Operations
3-51 ZM2376
Direct correction frequencies
In the global correction, the correction value is measured directly at the following frequencies (direct
correction points):
DC / 0.02 / 0.03 / 0.05 / 0.07 /
0.1 / 0.15 / 0.22 / 0.33 / 0.5 / 0.7 /
1 / 1.5 / 2.2 / 3.3 / 5 / 7 /
10 / 15 / 20 / 30 / 40 / 55 / 70 / 90 /
110 / 130 / 165 / 220 / 290 / 400 / 500 / 600 / 800 /
1k / 1.2k / 1.5k / 2k / 2.5k / 3k / 4k / 5k / 6k / 8k /
10k / 12k / 15k / 20k / 25k / 30k / 40k / 50k / 60k / 80k /
100k / 120k / 150k / 200k / 250k / 300k / 400k / 500k / 600k / 800k /
1M / 1.2M / 1.5M / 2M / 2.5M / 3M / 4M / 5M / 5.5M [Hz]
The correction value is measured at the direct correction frequencies required to execute the
correction in the range between the specified lower and upper limit frequencies.
For other frequencies, correction values are obtained by interpolation. At a point near resonance
point where the correction value varies largely depending on the frequency, an error by interpolation
becomes large, and therefore it is recommended to use the spot correction.
Measurement signal level when measuring correction values
The OPEN, SHORT or LOAD correction value is measured on the measurement signal level at that
time. Since correction values may vary depending on the measurement signal level, it is
recommended to measure correction values again when the measurement signal level is changed.
If the measured value after the correction varies at each time of measurement of correction value, it
may mean the variation of correction value. In such a case, measure the correction value on a little
larger measurement signal level. If you execute the correction only at a specific frequency, more
accurate correction is possible by setting the spot correction value with the following steps.
• Disable the OPEN / SHORT / LOAD correction.
• Reduce the measurement speed and set a large averaging count to restrict the variation.
• Measure the spot correction values.
• Set the spot correction values.
DC bias when measuring the correction value
Regardless of the DC bias setting, during the measurement of the OPEN or SHORT correction value,
the DC bias is automatically turned off only during that measurement. With the DC bias turned on,
the OPEN and SHORT correction values cannot be measured.
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