09 | Keysight | E4991B Impedance Analyzer - Data Sheet
Calculated impedance measurement accuracy (continued)
Figure 3. |Z|, |Y| Measurement accuracy when open/short/load
calibration is performed. Oscillator level = –33 dBm. Point averaging
factor ≥ 8 within ± 5 °C from the calibration temperature.
Figure 4. |Z|, |Y| Measurement accuracy when open/short/load
calibration is performed. Oscillator level = –33 dBm. Point averaging
factor ≤ 7 within ± 5 °C from the calibration temperature.
Figure 5. Q accuracy without low-loss capacitor calibration (Specification)
and with low-loss capacitor calibration (Typical).
Measurement Support Functions
Error correction
Available calibration and compensation
Open/short/load calibration:
Connect open, short, and load standards to the desired reference plane and measure
each kind of calibration data. The reference plane is called the calibration reference
plane.
Low-loss capacitor calibration:
Connect the dedicated standard (low-loss capacitor) to the calibration reference plane
and measure the calibration data.
Port extension compensation (fixture selection):
When a device is connected to a terminal that is extended from the calibration
reference plane, set the electrical length between the calibration plane and the device
contact. Select the model number of the registered test fixtures in the E4991B’s setup
toolbar or enter the electrical length for the user’s test fixture.
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