Service Manual
WVR500
Waveform/Vector Monitor
070-8897-01
Warning
The servicing instructions are for use by qualified
personnel only. To avoid personal injury, do not
perform any servicing unless you are qualified to
do so. Refer to all safety summaries prior to performing service.
Specifications
Product Description
This section contains a brief functional description of the WVR500 monitor,
followed by the characteristics tables.
The Tektronix WVR500 monitor is a rasterizing television waveform/vector
monitor which outputs a display signal to a remote monitor or video switcher.
It has dual standard (NTSC and PAL) capability with the functionality of a
waveform monitor, vectorscope, and picture monitor. The instrument is 8 1/2
inch wide by 1 1/2 inch high by 17 inches long, weighing 4 1/2 pounds, fitting
the standard half-rack applications. The instrument can be powered from AC
lines ranging from 90-250 V.
The WVR500 monitor uses a proprietary rasterizer which displays analog-like
waveforms and vectors on the remote monitor simultaneously with the appropriate measurement graticules. The rasterized waveform and vector displays can fill
the entire screen or be reduced to 1/4 sized windows overlaying the picture
monitor display. The picture monitor display cannot be resized.
Instrument operation is controlled by a microprocessor which polls the front-panel switches. The front-panel switches are the momentary touch type, several of
which have lighted functional indicators. Many of the monitoring functions are
selected through the on-screen menus, which are entered by pressing front-panel
buttons.
Displays can come from two channels of unterminated composite video input
loopthrough connectors on the rear panel. An external reference input allows for
the connection of an external sync signal. The rear-panel remote connector
allows for full instrument operation from a remote location.
The Waveform display mode provides three standard sweep rates: 1 Line
(5 ms/Div), 2 Line (10 ms/Div), and 2 Field. The line-rate sweeps can be
magnified X10 to additional sweep rates: 1 Line Mag (0.5 ms/Div), and 2 Line
Mag (1 ms/Div). The 2 Field sweep is magnified by approximately X20. Vertical
gain is either fixed at X1 or X5, or variable from 50% to 120% of the input
signal amplitude. The signal filter selections are Flat (no filter) and Luminance
(low pass filter), which can be displayed separately or in a parade display in the
2 Line and 2 Field sweeps. The Line Select mode allows specific lines to be
viewed. The Amplitude Alarm mode provides automatic video level monitoring
by highlighting the portion of the waveform exceeding the 100 IRE (1.0 V PAL)
graticule line.
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Specifications
The Vectorscope display mode displays signals with the standard vectorscope
color bars amplitude and phase relationships. The vector display can also be used
to make differential gain and phase measurements. The +V display (PAL only)
overlays the –V axis on the +V axis to check the PAL system color encoders.
A full 360_ digital phase shifter, with 75% and 100% color bars settings, and
variable gain are provided.
The Picture Monitor display mode displays the video input signal as a picture.
The brightness, contrast, hue, and chroma of the display are set internally and are
not adjustable.
The Waveform-in-Picture display mode displays the Waveform Monitor and/or
the Vectorscope displays in 1/4-screen sized windows overlaying the Picture
Monitor display. The reduced displays can be made semi-transparent for full
viewing of the Picture display.
Options
Accessories
User Interface
Characteristics Tables
Refer to the Options section for a list of the available options for the WVR500
monitor.
Refer to the Replaceable Parts list for a list of the Standard and Optional
accessories.
Many of the instrument monitoring parameters are configured through the menu
system. The
menu access, while the numbered buttons are used to make selections from the
displayed menus. The large unlabeled center knob is called the General Purpose
(GP) Knob, and is assigned control of monitoring functions through the menu
system. Instructions on how to make menu selections begin on page 2–12.
The current setting of several of the front-panel controls are displayed in the
on-screen readout. A description of the on-screen readout begins on page 2–11.
The tables that follow specify instrument electrical characteristics, mechanical
characteristics, environmental characteristics, and certification. The tables are
logically grouped under specific functions, beginning with video input and
vertical channel specifications and ending with the instrument’s certifications.
MENU, PRESETS, DISPLAY, CONFIG, and CLEAR buttons control
1–2
Categories
Each table consists of a column that identifies the characteristics that are defined
by the entries in the description column. A single item in the category column
might have multiple description items, which could include performance
requirements, reference information, and performance verification step numbers.
WVR500 Waveform/Vector Monitor Service Manual
Specifications
Descriptions
The second column of the two column format contains all of the descriptive
material about the listed characteristic. In addition, the performance verification
procedure step number, used to verify the characteristic, is also in this column.
Because this instrument is designed to operate on both PAL and NTSC standards, some of the tolerances are defined in millivolts and IRE units. In these
dual-value tolerances, the PAL values appear in parentheses.
Performance Requirements (Req). Items with this designation are critical to
instrument performance. In most cases they have a tolerance given and have a
performance verification step number accompanying them. However, there are a
few areas where instrument operation verifies that this performance requirement
is met.
Reference Information (RI). This is information about the operation of the
instrument that is important enough to place it with the performance requirements. In some cases there may be a tolerance listed, but these should be
considered as typical, not absolute.
Performance Verification Step. This item identifies the step number of the
Performance Verification procedure, located in Section 4, which tests the listed
requirement. Section 5 contains calibration information, if instrument readjustment becomes necessary.
T able 1–1: Vertical deflection system
Category Description
Deflection Factor Req: 1 V Full Scale: 1 V input displayed within 1% of 140 IRE (1.0 V PAL).
RI: Flat filter selected.
Req: X5 Gain: Gain Accuracy ±5%.
RI: 1 V input signal.
Req: X5 Gain Registration: ≤1 major division of vertical shift from baseline between
unmagnified and magnified signal.
Req: Variable Gain Range: Input signals between 0.8 V and 2 V can be adjusted to
140 IRE (1.0 V PAL) display. 160 mV and 400 mV for X5 Gain.
Req: Position Range: 1 V signal can be positioned so that peak white and sync tip can
be placed at blanking level, with the DC Restorer Clamp on, regardless of gain
setting.
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Specifications
T able 1–1: Vertical deflection system (cont.)
Category Description
Frequency Response Req: 1 V Full Scale: 50 kHz to 6 MHz within 2% of response at 50 kHz.
RI: Specifications apply for full screen height video input signal, with Variable
Gain off, and Flat filter selected.
Req: X5 Gain: 50 kHz to 6 MHz within 5% of response at 50 kHz.
RI: Flat filter selected.
Req: Luminance Filter: ≥30 dB attenuation at 4.00 MHz.
RI: Response at 15 kHz does not vary between Flat and Luminance filters by
more than 1%.
Transient Response RI: Specifications apply for full screen height video input signal, with Variable
Gain off, 1 V Full Scale or X5 Gain, using the 2T pulse and 2T bar.
Req: Pulse-to-Bar Ratio: X1: 0.99:1 to 1.01:1.
X5: 0.98:1 to 1.02:1.
Req: Field Rate Square Wave or V ertical Window Tilt: ≤1%.
Req: 25 s Bar Tilt: ≤1%.
Req: Overscan: ≤2% variation in baseline of 100 IRE (700 mV P AL) 12.5T (20T PAL)
modulated pulse as it is positioned over the middle 80% of the screen.
RI: Preshoot: ≤1%.
RI: Overshoot: X1: ≤2%.
X5: ≤4%.
RI: Ringing: X1: ≤2%.
X5: ≤4%.
Maximum Absolute Input Level Req: ±5 VDC + peak AC.
RI: Displays in excess of 200 IRE (1.428 V PAL) may cause frequency response
aberrations.
RI: Maximum Operating Input V oltage: Peak AC + DC should be within +8.0 V
and –5.6 V for proper operation.
DC Input Impedance Req: ≥15 k.
RI: Unterminated.
Return Loss (75 ) Req: ≥40 dB from 50 kHz to 6 MHz.
RI: CH-A and CH-B input channels, loopthrough terminated in 75 . Input in use
or not in use, instrument power on or off, all deflection factor settings.
Loopthrough Isolation RI: ≥70 dB of isolation between loopthroughs. Measured at FSC between CH-A,
CH-B, and EXT REF inputs.
1–4
WVR500 Waveform/Vector Monitor Service Manual
Specifications
T able 1–1: Vertical deflection system (cont.)
Category Description
Crosstalk Between Channels RI: ≥70 dB of isolation between channels. Measured at FSC between CH-A,
CH-B, and EXT REF inputs.
Video Out RI: Differential Gain (50% APL): Within 1% with a 140 IRE (1.0 V PAL) unit
display .
RI: Differential Phase (50% APL): Within 1° with a 140 IRE (1.0 V PAL) unit
display.
Req: Return Loss (75 ): ≥30 dB from 50 kHz to 6 MHz.
RI: With the instrument turned on.
Req: Input to Video Out Gain Ratio: 1:1 ±5% @ 15 kHz.
RI: Picture display mode.
T able 1–2: DC restoration
Category Description
DC Restorer Clamp Time RI: Back Porch.
Frequency Response at 60 Hz (50 Hz PAL) Req: Attenuation of 60 Hz (50 Hz PAL) on Input signal:
Slow Mode – ≤20%.
Fast Mode – ≥90%.
Req: Blanking Level Shift with 10% to 90% APL Change: APL changes from 50% to
either 10% or 90% will cause blanking level shift of 1 IRE unit (7.14 mV PAL) or
less.
Req: Blanking Level Shift Due to Presence or Absence of Burst: 1 IRE unit (7.14 mV
PAL) or less shift from no color burst to presence of color burst.
T able 1–3: Horizontal deflection system
Category Description
Sweep Req: Sweep will occur in all Horizontal mode settings with or without synchronization.
2FLD Sweep Repetition Rate RI: Displays 2 full fields, including the field rate sync between them.
2FLD Sweep Magnification RI: Approximately X20.
1LINE Sweep Repetition Rate Req: Equal to the line-rate of applied video or external sync.
2LINE Sweep Repetition Rate Req: Equal to half the line-rate of applied video or external sync.
Sweep Length RI: 2LINE and 2FLD sweep length is nominally 12.5 divisions.
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Specifications
T able 1–3: Horizontal deflection system (cont.)
Category Description
Timing Accuracy RI: All timing and linearity specifications exclude the first and last major divisions
of the unmagnified display.
Req: 10 ms/div. (2LINE): Within 2%.
Req: 5 ms/div. (1LINE): Within 2%.
Req: 1 ms/div. (2LINE + MAG): Within 2%.
Req: 0.5 ms/div . (1LINE + MAG): Within 3%.
Integral Linearity Req: Within 1%.
RI: Measured between the 10 ms and 110 ms points on the 10 ms/division sweep.
Sweep Magnifier Registration RI: Magnification occurs about the center of the screen.
Horizontal Position Req: Any portion of a synchronized video sweep can be positioned on screen in all
sweep modes.
T able 1–4: Synchronization
Category
Input Requirements Req: Internal Reference, NTSC: Composite video or black burst with sync amplitudes
40 IRE ±6 dB.
Req: Internal Reference, P AL: Composite video or black burst with sync amplitudes
300 mV ±6 dB.
Req: External Reference: Sync amplitude between 143 mV and 4 V will synchronize
sweeps.
EXT REF Input Req: DC Input Impedance (Unterminated): ≥15 kW.
Req: Return Loss (75 W): ≥40 dB from 50 kHz to 6 MHz.
RI: Loopthrough terminated in 75 W, instrument power on or off.
RI: Absolute Maximum Input Voltage: ±12 VDC plus peak AC.
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WVR500 Waveform/Vector Monitor Service Manual
T able 1–5: Vector mode
Category Description
Chrominance Processing Req: Chrominance Bandwidth:
Upper –3 dB Point: F
Lower –3 dB Point: F
RI: Nominal Subcarrier Frequency (FSC)
NTSC: 3.579545 MHz.
PAL: 4.43361875 MHz.
RI: +V Mode (Applicable to PAL operation only): +V-type display as selected by
front-panel menu selection. When selected, V axis is inverted at a half
line-rate to produce a single vector display.
Display RI: Vector Phase Accuracy: ±1.25. Measured with color bar signal.
RI: Vector Gain Stability: Typically ±2.5%.
RI: Quadrature Phasing: Typically ±0.5.
Subcarrier Regenerator Req: Pull-In Range
NTSC: ±50 Hz of F
PAL: ±10 Hz of F
RI: Subcarrier Regenerator free runs in absence of appropriate signal. Reference
can be burst of either the displayed signal or the external reference signal.
RI: Pull-In Time: Within 1 second, with subcarrier frequency within 50 Hz (10 Hz
for PAL) of F
Req: Phase Shift with Subcarrier Frequency Change:
NTSC: ±2° from F
PAL: ±2° from F
Req: Phase Shift with Burst Amplitude Change: ±2_ from nominal burst amplitude to
±6 dB.
RI: Internal or External burst reference.
Req: Phase Shift with Input Channel Change: ±0.5_.
RI: With EXT REF selected.
Req: Phase Shift with Variable Gain Control: ±1_as gain is varied from +3 dB to –6 dB.
RI: Phase Control Range: 360_ continuous rotation.
Req: Burst Jitter: 0.5_ rms or less.
RI: With 140 IRE (1 V PAL) composite video input. Internal or external
referenced.
Display Characteristics RI: Differential Phase: ±1_.
RI: Differential Gain: ±1%.
RI: Measured with 140 IRE (1 V PAL) linearity signal (5-step, 10-step, or Ramp)
with 40 IRE (300 mV PAL) of subcarrier.
+500 kHz, ±100 kHz.
SC
–500 kHz, ±100 kHz.
SC
.
SC
.
SC
.
SC
to (FSC +50 Hz), or FSC to (FSC – 50 Hz).
SC
to (FSC +10 Hz), or FSC to (FSC – 10 Hz).
SC
Specifications
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Specifications
T able 1–6: Power source
Category Description
Mains Voltage Range Req: 90–250 V.
Mains Frequency Range Req: 48 Hz to 66 Hz.
Power Consumption RI: 25 W atts maximum.
Power Fuse Rating Req: 250 V, 2 A, F-type.
T able 1–7: Physical characteristics
Category Description
Dimensions RI: Height: 1 3/4 inches (44.5 mm).
Width: 8 inches (203.2 mm).
Length: 18 1/2 inches (469.9 mm).
Weight RI: Approximately 4.0 lbs (approximately 1.8 kg).
T able 1–8: Environmental characteristics
Category Description
Temperature RI: Non-Operating: –55° C to +75° C.
Operating: 0° C to +50° C.
(IEC 1010-1 compliance to +40° C.)
Altitude RI: Non-Operating: To 50,000 feet.
Operating: To 15,000 feet.
(IEC 1010-1 compliance to 2000 meters.)
Equipment Type RI: Measurement (as defined in IEC 1010-1, Annex H).
Equipment Class RI: Class I (as defined in IEC 1010-1 Annex H).
Installation Category RI: Installation Category II (as defined in IEC 1010-1, Annex J). Note: Rated for
indoor use only.
Pollution Degree RI: Pollution Degree 2 (as defined in IEC 1010-1).
Vibration — Operating RI: 15 minutes each axis at 0.015 inch, frequency varied from 10–55–10 Hz in
1-minute cycles with instrument secured to vibration platform. 10 minutes
each axis at any resonant point or at 55 Hz if a resonant point is not found.
MIL-T-28800D, Paragraph 1.2.2, Class 3.
Shock — Non-Operating RI: 30 g, 1/2 sine, 11 ms duration, 3 shocks per surface (18 total).
Transportation RI: Qualified under NST A Test Procedure 1A, Category II (24 inch drop).
Humidity RI: Will operate at 95% relative humidity for up to five days.
1–8
WVR500 Waveform/Vector Monitor Service Manual
Specifications
Table 1–9: Certifications and compliances
Category Description
EC Declaration of Conformity Compliance was demonstrated to the following specifications as listed in the Official
Journal of the European Communities:
EMC Directive 89/336/EEC:
EN 50081-1 (Emissions):
EN 55022 Class B Radiated and Conducted Emissions
EN 50082-1 (Immunity):
IEC 801-2 Electrostatic Discharge Immunity
IEC 801-3 RF Electromagnetic Field Immunity
IEC 801-4 Electrical Fast T ransient/Burst Immunity
Conditional Statements:
1. High quality shielded cables must be used to insure compliance to the
above listed standards.
Low Voltage Directive 73/23/EEC, Amended by 93/68/EEC:
EN 61010-1 Safety requirements for electrical equipment for measurement,
control, and laboratory use. Part 1: General Requirements.
Safety Standards
U.S. Nationally Recognized
Laboratory Listing
Canadian Certification CAN/CSA C22.2 No. 231 CSA Safety Requirements for Electrical and Electronic
European Union Compliance Low Voltage Directive 73/23/EEC, Amended by 93/68/EEC.
UL1244 Standard for Electrical and Electronic Measuring and Testing Equipment.
Measuring and Test Equipment.
EN61010-1 Safety Requirements for Electrical Equipment for Measurement, Control, and
Laboratory Use.
Additional Compliance IEC1010-1 Safety Requirements for Electrical for Measurement, Control, and
Laboratory Use.
Safety Certification Compliance
Temperature, operating +5 to +40_ C
Altitude (maximum operating) 2000 meters
Equipment Type T est and measuring
Safety Class Class I (as defined in IEC 1010–1, Annex H) – grounded product
Overvoltage Category Overvoltage Category II (as defined in IEC 1010–1, Annex J).
Pollution Degree Pollution Degree 2 (as defined in IEC 1010–1). Note: rated for indoor use only.
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