Wavetek 3HRV Spécifications Page 60
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- Table des matières
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Noté. / 5. Basé sur avis des utilisateurs
4-37
Scale Adjustment
The UP and DOWN arrow keys can be used to adjust the reference
level on the analog meter. This is helpful when the audio and video
levels differ by large amounts.
To automatically scale the analog meter, press the FCN key followed
by the Scale second function key.
When in the TV channel mode, the level is represented using dual
analog meters; one for the video carrier and one for the audio carrier
(two in the video + dual audio channels mode).
When in the frequency mode or single channel mode, the level is
indicated by a single meter.
4.5 HOW TO MEASURE TILT - BALANCING AN AMPLIFIER
A cable system is designed for unity gain, and the output of each like
type of amplifier (trunk, bridger/line extender) should be as close to
identical as physically possible. The amplifiers are set up with
specified levels for signals at the high and low end of the spectrum
that are used for Automatic Gain Control (AGC) or Automatic Slope
Control (ASC). In the amplifier balancing process, these signals are
measured and adjusted to specification. Before making an adjust-
ment, ensure that there are no problems in the system that should not
be compensated with an adjustment but repaired instead.
To balance the amplifier, ensure that the AGC and ASC is switched
off. Tilt mode simplifies the actual balancing by displaying a bar
graph with a representation of up to nine different user selected
video carrier levels. Adjust the high pilot level to the specified level
using the gain control. The gain control tends to affect the overall
amplitude throughout the spectrum equally. Adjust the low pilot
level to the specified level using the slope control. The slope control
affects the low end of the spectrum more than the high end. Due to
the interaction between the two controls, repeat this process until the
pilots are "balanced". Then switch on the AGC and ASC, wait a
moment to measure the signal levels with the AGC and ASC acti-
vated.
- MODEL 3HRV 1
- WARRANTY 2
- Contents 3
- 1.2 SPECIFICATIONS 7
- 1.2.3 Hum Measurement 8
- 1.2.5 Telemetry 9
- 1.2.6 Transmitter 9
- 1.2.7 Spectrum Mode 9
- 1.2.9 Depth of Modulation 10
- 1.2.10 Serial Interface 10
- 1.2.11 General 10
- 1.2.12 Powering 11
- 1.2.13 Standard Accessories 11
- 1.2.14 Options 11
- 1.2.15 Optional Accessories 11
- SECTION 2 INSTALLATION 13
- 2.4 WARRANTY INFORMATION 14
- 2.5 POWER REQUIREMENTS 15
- 2.6 CABLE SPECIFICATIONS 15
- Serial Printer Cable 16
- 2.7 TECHNICAL SUPPORT 17
- 2.8 Worldwide Sales Offices 17
- SECTION 3 USER INTERFACE 18
- 3.2.4 Arrow Keys 21
- 3.2.6 Printing 23
- REVERSE SWEEP RECEIVER 24
- 4.2 HOW TO SETUP YOUR 3HRV 28
- 4.3 SETUP 36
- 4.3.1 General Setup 37
- 4.3.2 Measurements Setup 41
- 4.3.5 Reverse Sweep 51
- 4.6 SCAN MODE 62
- 4.7 HOW TO MEASURE C/N 66
- • Noise frequency 67
- 4.8 HOW TO MEASURE HUM 68
- 4.9 MODULATION 69
- 4.10 SPECTRUM ANALYZER MODE 70
- 4.11 SWEEP MODE 75
- 4.12 FILE 77
- 4.13 AUTO 78
- 4.14 STATUS 96
- INTRODUCTION 97
- APPENDIX B USER MESSAGES 98
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