Technical data

5-23

Operating Concepts

Electrical Delay

The ELECTRICAL DELAY, softkey adjusts the electrical delay to balance the phase of the test device.

This softkey must be used in conjunction with COAXIAL DELAY, or WAVEGUIDE DELAY, (with cut-off

frequency) in order to identify which type of transmission line the delay is being added to. These softkeys

can be accessed by pressing the Scale Ref, key.

Electrical delay simulates a variable length lossless transmission line, which can be added to or removed

from a receiver input to compensate for interconnecting cables, etc. This function is similar to the

mechanical or analog "line stretchers" of network analyzers. Delay is annotated in units of time with

secondary labeling in distance for the current velocity factor.

With this feature, and with MARKER DELAY, an equivalent length of air-filled, lossless transmission line is

added or subtracted according to the following formula:

Once the linear portion of the test device's phase has been removed, the equivalent length of the lossless,

transmission line can be read out in the active marker area. If the average relative permittivity (

) of the

test device is known over the frequency span, the length calculation can be adjusted to indicate the actual

length of the test device more closely. This can be done by entering the relative velocity factor for the test

device using the calibrate more menu. The relative velocity factor for a given dielectric can be calculated

by:

assuming a relative permeability of 1.

Length meters()

Freq MHz()1.20083×

()

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Velocity Factor

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