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Field Sweeping with the SDA-5000: Test Point Compensation

As an example, consider the amplifier shown in Fig. 4-3:

Fig. 4-3 Test Point Compensation Values

Measured at the test points available at the output of the amplifier, the

forward test point loss is 20dB. If you’re balancing constant inputs to

the hybrid, the reverse test point loss is 20dB for the test point, plus

1.0dB for a diplexer, plus 3.5dB for a splitter, plus the pad value at the

input to the reverse amplifier (for example, assume 3dB). This would

be entered as 20dB of test point loss and 7.5dB of “internal” losses.

This value would be entered in the top data box in the display. In this

configuration, a splitter would be required to combine the two output

ports of the SDA-5000. This would be entered as 3.5dB of loss in the

external entry for both forward and reverse test point compensation.

5. The telemetry and sweep generation and injection levels are

displayed in the TESTPOINT INFO screen (see Fig. 4-4). The

generated levels are calculated based on the desired system levels

set at the main SWEEP configuration menu (see “Sweep

Configuration” on page 64), and the test point losses entered here.

The telemetry level is calculated precisely for a specific frequency and

level. This value can be used with the headend display to perform

absolute level alignment, so it is calculated to 0.1dB resolution.

0.5dB

PAD

PAD H

PADEQ

PAD H

20dB

Test Point

NPUT

OUTPUT

0.5dB

3.5dB

3.0dB

PAD

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