Spectrum Analyzer Menus
2715 User Manual
6–5
7. Press [
b
] to the right of [REF LEVEL] twice.
Notice that the signal peak rises but the noise floor does not. This is because
the RF attenuation decreased each time you pressed the key. The increased
signal height is achieved by reducing attenuation. However, the noise floor is
generated after the RF attenuator, so it is not affected.
8. Reset the reference level to 48.8 dBmV and select the INPUT menu.
Item 5 indicates that the RF attenuation is 30 dB and that it is selected automati-
cally by the 2715. We can control the RF attenuation so that it remains at a fixed
value.
9. Press [5], and this prompt appears:
ENTER NEW VALUE OR “W”: __
( 0 TO 50 IN 2 DB STEPS )
W = AUTO
10. Press [3] [0] [Y] to enter a fixed value of 30 dB.
The display returns unchanged.
11. Press [
b
] twice.
Now the signal peak and the noise floor both rise. This is because pressing
[
b
] twice increased the 2715 IF gain by 20 dB to lower the reference level,
but the RF attenuation is unchanged.
12. Press [INPUT] [5] [W] to place the RF attenuation back in the automatic
mode.
The following steps show how to change reference level units:
13. Press CATV/APPL to select the APPL menu.
14. Press [8] to select CATV MEASUREMENTS SETUP.
15. Press [6] to select REF LEVEL UNIT.
Item 6 toggles between DBUV and DBMV, as indicated on the right side of
the screen.
There is an alternate method to change reference level units from the INPUT
menu.
16. Press [INPUT] to select the Input menu.
Changing Reference Level
Units
Содержание 2715
Страница 4: ......
Страница 12: ...Table of Contents viii 2715 User Manual ...
Страница 18: ...Preface xiv 2715 User Manual ...
Страница 19: ...Introduction ...
Страница 20: ......
Страница 24: ...Introduction 1 4 2715 User Manual ...
Страница 25: ...Getting Started ...
Страница 26: ......
Страница 46: ...Getting Started 2 20 2715 User Manual ...
Страница 47: ...Operating Basics ...
Страница 48: ......
Страница 70: ...Operating Basics 3 22 2715 User Manual ...
Страница 71: ...Dedicated Controls ...
Страница 72: ......
Страница 108: ...Dedicated Controls 4 36 2715 User Manual ...
Страница 109: ...CATV Measurements ...
Страница 110: ......
Страница 181: ...Spectrum Analyzer Menus ...
Страница 182: ......
Страница 274: ...Spectrum Analyzer Menus 6 92 2715 User Manual ...
Страница 275: ...Appendices ...
Страница 276: ......
Страница 302: ...Appendix B Broadcast AM FM and TV Signal Sources B 2 2715 User Manual ...
Страница 318: ...Appendix C System Messages C 16 2715 User Manual ...
Страница 334: ...Appendix E External Input and Output E 12 2715 User Manual ...
Страница 339: ...Glossary and Index ...
Страница 340: ......
Страница 359: ......
Страница 360: ......