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2-port vector network analyzer ARINST VNA-PR1
15
Device limitations in displaying distance
Maximum displayed distance D
MAX
depends on the speed factor VF. When VF=1, maximum
displayed distance D
MAX
= 3000m.
Distance resolution
– D
MAX
/ 1024;
The minimum distance shown on the display is D
MAX
/ 8.
For correct time or distance measurement, select a frequency range so that the maximum dis-
played time or length is greater than the expected cable length. Otherwise, the estimate of the
time or cable length will be incorrect and certainly less than the real one.
9.3.3. Enter the speed, time, or distance factor that determines the length of the plot's horizontal scale
(figure 9.8) and click
(Data entry)
. To delete incorrect or previously entered values, click
˂
(Delete)
. To
exit the menu without entering values press
× (Cancel)
.
The input menu displays the maximum value that cannot be exceeded. The maximum value is limited
to the selected frequency range.
Figure 9.8 - Entering values for the horizontal scale parameters of the DTF plot
9.4. Device calibration menu
Attention!
All devices are factory calibrated by the manufacturer. Removable SMA adapters screwed
onto the instrument connectors are taken as the reference plane.
When using cable assemblies or addi-
tional adapters, the device must be recalibrated according to the instructions. It is recommended to use
ready-made calibration kits to calibrate the device.
In order to avoid premature wear of the instrument connectors, it is recommended to carry
out measurements with the screwed-on adapters supplied.
Factory
calibration information is displayed in the information bar of the screen. To increase meas-
urement accuracy with optional adapters and cables, you must perform a full 1-port or 2-port calibration
using a calibration kit, sold separately.
9.4.1. Enter the
Calibration
section of the main menu of the device (Figure 9.9).
9.4.2. To exclude the influence of connecting wires and connectors on the measurement results, carry
out calibration.
Calibration is performed after warming up the device for at least five minutes. The change in ambient
temperature from the moment of calibration to measurements should not exceed ± 3 ° С. Always calibrate
the device before taking critical measurements to eliminate the influence of ambient temperature.
Summary of Contents for ARINST VNA-PR1
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