Tektronix VM700A Analyzer
Video Measurement Set
Video Measurement Set is a multi-function
television test and measurement device with an easy to use
interface. The VM700A
performs the functions of a waveform
monitor, vectorscope, automatic measurement set, and a
noise measurement set on acquired television signals.
Signals can be broadcast or from test equipment. The user
may select numeric value displays to confirm signal path
quality, or graphic displays for more detailed analysis.
can be operated directly using the front panel or
remotely using one of the RS-232C ports on the rear panel.
Automatic Video Measurements
Auto mode makes standardized video measurements
automatically, including those specified in the
RS-250B/EIA-250C, NTC-7, and RS-170A video signal
standards. These measurements can be compared with
user-selectable limits. The VM700A
generates a caution or
alarm message if a measurement falls outside the selected
limits. Reports can be formatted and printed at
For detailed waveform analysis, you may display the actual
signal and take additional measurements manually. In
Waveform mode, cursors are available to aid in measuring
time, frequency, and amplitude. These cursors allow precise
location of 10, 50, and 90 percent points on any transition.
You may expand the waveform display around any vertical or
horizontal point. Since the data is digitized, the display
remains bright at all expansion factors.
The axes automatically expand with the waveform, so all
units are correct as displayed.
The Vector mode provides the normal vectorscope display. The
vectors may be rotated or expanded, with the rotation angle
and gain values displayed numerically on the screen.
A unique “Find Colorbars” feature searches all video for
colorbars and displays the vectors it finds. Select Line in
both Waveform and Vector modes can be used to quickly
specify any line for display or automatic measurement if the
proper signal type is being measured.
Graphic Displays of Measurements
Measure mode provides graphic displays of measurements such
as noise spectrum, group delay, and K-factor, for adjustment
or closer analysis of the measurement. Most measurements can
be made relative to a stored reference to minimize or
eliminate signal source errors. Most measurements have
averaging to reduce the effects of random noise.
You may quickly verify the signal source using the picture
mode display and select any line on the picture for viewing
in the waveform or vector displays.
You can define a sequence of operations as a new function.
For example, the measurements to be made on a transmitter
demodulator video output could be identified with a function
labeled DEMOD. A user would select this function to
make all measurements and provide a printout.
All information on screen may be printed on printer
supporting PostScript1 or 24-pin Epson2 graphics via the
standard RS-232C Interface
. Automatic measurement results
can be printed on most ASCII printers using the same
can be operated from a remote terminal via its
RS-232C ports to monitor unattended transmission systems, or
to put systems under computer control.
White Phosphor CRT (Option 74)
This option provides a display module with a white phosphor
CRT instead of the standard green phosphor when a new
instrument is ordered with Option 74 from the factory. All
the display module adjustments are the same as those for the
Controls and Connections
This is a description of the VM700A
front panel controls and
rear panel connections. The VM700A
can be operated directly
using the front panel or remotely using one of the RS-232C
ports on the rear panel.
Front Panel Controls
The front panel (shown in Figure 2-1) consists of a touch
screen and a 20-button keypad with a control knob.
Руководство по техническому обслуживанию
Hасто́льная кни́га тип:
Руководство по техническому обслуживанию
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Hасто́льная кни́га ID:
01 Январь 1995
Электронный документ, ни сканирование, очень хорошо читается.
30 Декабрь 2017
This manual contains the following sections:
Specification - Lists the major specifications of the VM700A
and the Option
01 and Option 11 measurements. Other option specifications
are contained in
the associated Option User Manuals.
Operating Information - Introduces the VM700A
features, and the controls and connectors of the instruments.
Theory of Operation - Contains functional circuit
descriptions of the
VM700A’s circuit boards to aid in understanding the
Verification and Adjustment- Procedures for verifying the
operation of the
and adjustments to return the VM700A
Maintenance - Customer service information and illustrated,
procedures for removing and replacing the field-replaceable
Troubleshooting and Diagnostics - Contains information to
troubleshoot the VM700A
and replace faulty circuit boards or
Replaceable Electrical Parts List - The replaceable
electrical parts are
listed by assembly and circuit component number.
Diagram and Circuit Board Illustrations - Schematic diagrams
board illustrations are supplied to assist in circuit repairs.
Replaceable Mechanical Parts List - Exploded views and lists
replaceable mechanical parts are provided to aid in locating