Wavetek 147 Specifikace stáhnout pdf (Strana 86)

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Field Sweeping with the SDA-5000: Test Point Compensation

Press this soft key to call up the TESTPOINT INFO

screen shown in Fig. 4-4. This screen provides

information for telemetry and sweep about transmitted

output levels, total losses, and actual and desired levels

and the delta between them.

4. To accurately calculate reverse test point loss, it’s helpful to have a

block diagram of the amplifier to be adjusted. When you’re balancing

constant inputs to the hybrid, the Internal entry represents the internal

losses from the injection point to the hybrid. These losses (the top

entry box in the display) arise from the various splitters, diplexers, and

so on, in the amplifier between the injection point and the amplifier

input. Test point, or probe, loss (the entry box third from the top in the

display) is the DC value of the test point.

Fig. 4-2 The REV COMPENSATION Screen

CAUTION ! Resistive test points should not be used for

reverse sweep. You might get inaccurate results because

of the presence of standing waves.

External losses represent the components used to connect to the test

point. For these values, positive numbers represent loss, which is the

norm. Negative values represent gain (a very rare event). This value

is entered in the box second from the top in the display.

Add all test point losses to get a total.

1 2 ... 81 82 83 84 85 86 87 88 89 90 91 ... 409 410

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