Instructions

T3VNA User Manual 79
1. Extensions
Port extensions mathematically compensate data for any known phase shift/delay and amplitude errors
caused by xtures or additional circuit elements that cannot be removed by calibration. Common
examples include test xturing that is required to use a particular circuit element or device.
When port extensions are enabled, the “P” icon will be displayed near the calibration status in the upper-
left portion of the screen. The default setting is Close (o).
2. Delay Port1
Set the delay of Port1 extension.
The relationship between Port Delay and Port Length is as follows:
Port Length = Port Delay * c0 * Velocity Factor, where c0=299792458m/s
3. Length Port1
Set the length of Port1 extension.
4. Delay Port2
Set the delay of Port2 extension.
5. Length Port2
Set the length of Port2 extension.
6. Auto Open Port1
Automatically calculate the delay and length of Port1.
3.4.6.6 System Z0
Set the System characteristic impedance (Z0).
3.4.6.7 Velocity Factor
Set the velocity factor of the cable to be measured relative to the speed of light in vacuum. Make sure
that the velocity factor of the cable to be measured conforms to the reality.
Table 3-10 Velocity Factor
Parameter
Explanation
Default 0.66
Range 0.1 - 1
Unit N/A
Knob Step 0.01
Direction Key Step In 1-2-5 sequence