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Adjustments 8712ET/ES and 8714ET/ES

Introduction RF Network Analyzers

2-2 Service Guide

Introduction

This chapter contains procedures to adjust the analyzer. Generally these adjustment

procedures are only used when hardware has been replaced in the instrument, or if there

is a failure in the operators check or the performance tests (seeChapter 1). Refer to

Table3-1, “Post Repair Procedures,” on page3-23 to determine which adjustment

procedures you need to do when a particular part has been replaced.

Adjustments #102 through #111 affect the correction constants that are stored in the

non-volatile memory of the instrument. As adjustments are performed, new correction

constants are created.The user controls when the new correction constants are stored in

the non-volatile memory. The frequency accuracy adjustment, which could require a

potentiometer adjustment, and the serial number (Adjustment #100) do not affect the

correction constants.

Before performing adjustments, turn on the analyzer and allow it to warm up for one hour.

Most adjustments are accessed through the analyzer's service menus.

You should perform the adjustment procedures in the order given here:

1.”Frequency Accuracy Adjustment”on page 2-5

2.”Switched Gain Correction, Adjustment #102”on page 2-10

3.”External Detector Gain Correction, Adjustment #103”on page 2-12

4.”Auxiliary Input Correction, Adjustment #111”on page 2-14

5.”Source Power Correction, Adjustment #104”on page 2-15

6.”B Amplitude Correction, Adjustment #105”on page 2-18

7.”Reﬂection (One-Port) Correction, Adjustment #107”on page 2-19

8.”Transmission Correction, Adjustment #106”on page 2-20

9.”B* Amplitude Correction, Adjustment #110”on page 2-21

10.”R* Amplitude Correction, Adjustment #108”on page 2-23

11.”R* Frequency Response Correction, Adjustment #109”on page 2-25

CAUTION Procedures 2 through 11 all generate correction constants. For efﬁcient operation,

these correction constants must be handled properly. Please read the“Correction

Constants (CCs) Storage” on page2-4 carefully.

CAUTION The preset power level is user-deﬁnable. After pressing in any

adjustment procedure, change the power level to 0 dBm if necessary.

NOTE During the adjustments, the analyzer will display a list of instructions in which the

names for the connectors may vary. For user clariﬁcation, “REFLECTION,” “RF

OUT,” and “PORT 1” all refer to the connector closest to the analyzer’s display, while

“TRANSMISSION,” “RF OUT,” and “PORT 2” all refer to the connector farthest from

the display.

PRESET

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Agilent Technologies 85032B/E 50 Specifiche Pagina 95