Agilent Technologies 8590 L-Series Especificações descarregar pdf (Página 263)

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101

Chapter 5 263

Troubleshooting the IF Section

IF Power-Level Measurement

Control lines for the A12 amplitude control assembly

Table 5-3 and Table 5-4 provide the control line output from the A7

analog interface assembly that change the gain of the A12 assembly

when the reference level is changed. The calibration attenuator settings

in Table 5-4 provide reference-level changes in 1 dB increments for the

full reference-level range of the analyzer.

Refer to “Troubleshooting the A15 Motherboard Assembly” in this

chapter when tracing control lines in the IF section. The entries in

Table 5-3 and Table 5-4 are valid after pressing the following keys.

PRESET

CAL

More 1 of 3

CORRECT ON OFF (OFF)

Be sure that the input attenuator setting remains at 10 dB.

For each reference level in Table 5-3, the Calibration Attenuator control

lines are set to 10 dB of attenuation as shown in the ﬁrst entry of

Table 5-4. The control line settings from Table 5-4 repeat, starting with

each reference level in Table 5-3 to produce reference-level changes in

1 dB increments.

Table 5-3 10 dB Step-Gain Control Lines

Reference

Level

(dBm)

10 dB

Step Gains

IFG1

(10dB Step)

A12J2-14

IFG2

(20-1 dB

Step)

A12J2-13

IFG3

(20-2 dB

Step)

A12J2-12

00LLL

−10 10 H L L

−20 20 L H L

−30 30 H H L

−40 40 L H H

−50 50 H H H

H = >2.5 V (TTL High)

L = <0.8 V (TTL Low)

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