Promax GV-298 User Manual
TV PATTERN GENERATOR
GV-298
1 GENERAL
1.1 Description
The exceptional attributes the GV-298 video generator consists of have been
designed in accordance with the latest trends of modern technology.
Its application field is ranging to every use in which a professional feature is
requested, such as to achieve the hardest requirements both in the synchronism step,
and the colour and radiofrequency ones.
User-friendly, compact and strong, the GV-298 is a specified tool for all
servicing needs. The GV-298 will become a consummate partner for after-service
professionals, both in workshop tasks and home repairs and fittings.
Eight different pattern charts are available, allowing essential settings to be
made in any television receiver, as well as to detect abnormalities through a visual
picture examination. Besides, these equipment builts in four additional functions, to be
connected or disconneted at will in every chart. This monitoring affects picture
interlacing, chroma subcarrier, sound and PAL commutation.
The synthesized RF modulator ranges from 37 MHz to 865 MHz, so any defect
in tuning circuits or in the IF of the receiver can be detected. Tuning is performed by
channel (CCIR, OIRT or FCC channes, depending on versi on), or directly by frequency
in 50 kHz steps. A two-cell attenuator allows up to a maximum of 60 dB to be
attenuated in 20 dB steps.
A microcontroller carries out the interaction with the user, by displaying chart,
channel and frequency (5-digits) at any time, on a 16-character display . Data displayed
may be changed in an easy way by means of three pushbuttons.
In order to increase quality and reliability of the GV-298, the built-in
microprocessor carries out a checking of several equipment devices during its
connection and use.
An Euroconnector is included, as well as an oscilloscope synchronizing output.
This equipment is i nt ended for c overi ng B, G and H st andards (CCIR). Versi ons
are available too for I, DK and N systems.
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1.2 Specifications
TV SYSTEM
System
RF sta ndard
Line freque ncy
Frame frequency
H orizonta l synchronism
Line pe riod
Pre vious pede stal
Synchronism
Blanking
Ve rtica l synchronism
Frame period
Blanking
Pulse time of:
- P re - e qua liz in g
- E qua liz ing
- P ost- e qu a liz ing
Frame sweep
Colour subcarrie r
Subca rrier freque ncy
Burst duration
Bur st pos ition
Phase
CCIR PAL
B, G, H (DK, I, N on request)
15625 Hz
50 Hz
64 µs ± 0.0002 µs
1.5 µs ± 0.3 µs
4.7 µs ± 0.2 µs
12 µs ± 0.3 µs
20 ms
25 H + 12 µs (H = 64 µs)
2.5 H
2.5 H
2.5 H
Selectable: - 2:1 interlaced ratio
- No interlaced
F=4.3361875 MHz <±30 ppm PAL B,G,H, DK,I.
F=3.582056 MHz <± 30 ppm PAL N
(10 ºC to 40 ºC).
2.5 µs (10 ± 1 F period)
At 5.6 µs from the line previous synchronism
flank.
135º as referred to U axis at the following
sequence:
Line Frame
1 2 3 4
Even - - + +
Odd + + - -
Amplitude error
Phase error
Subca rrier a mplitude
Re sidual subca rrier
± 5%
± 3º
ON/OFF , selectable
3% (as related with red colour amplitude, 100%
saturated).
DISPLAY
Digital, 16 characters, 5-digit frequency display,
channel, TV standard, programme, pattern chart
and sound system.
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TEST PICTURES
P atte rn cha rts a va ila ble
8
1.- 100% white pattern
2.- Electronic circle grid
3.- Dots
4.- Checkboard
5.- Colour bars
6.- Red pattern
7.- Green pattern
8.- Blue pattern
Anti-PAL pattern by removing the R-Y switching
RADIOFREQUENCY OUTPUT
Range
Tuning
From 37 to 865 MHz (synthesized)
By frequency: in 50 kHz steps
By channel: CCIR (OIRT version /2, FCC
version /6).
Output a mplitude
Attenuator
Output impe dance
Connector
80 dBµV ± 3.5 dB
0-60 dB in 20 dB steps
75
Ω
BNC
STABILITY
At constant tempe rature
At temperature
FREQUENCY INDICATOR
Indicator
Resolution
VIDEO MODULATION
M odulation type
M odulation index
Vide o/sound ra tio
SOUND MODULATION
Ca rrier fre quency
M odulation type
Drift
MODULATION SIGNAL
Inte rnal
Frequency
COMPOSITE VIDEO SIGNAL
Amplitude
Bias
Output impe dance
Connector
<1.2 x 10-3 /10 min. (the first 15 min.)
<4 x 10-4 /10 min. (during the first hour)
<1 x 10-4 /ºC (5 to 40 ºC)
In the 5-digit LCD display
50 kHz
AM, double side band
~ 85%
13 dB
5.5 MHz, ON/OFF selectable
FM
30 kHz
1 kHz ± 10%
1 Vpp
Positive
75
Ω
BNC and EUROCONNECT OR
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R-G-B OUTPUTS
Amplitude
Output impe dance
Connector
TRIGGER OUTPUT FOR OSCILLOSCOPE
Signal
Amplitude
0.7 Vpp
75
Ω
EUROCONNECTOR
Vertical + Horizontal
2 Vpp vertical
1.5 Vpp horizontal
5 k
Output impe dance
Connector
LOW FREQUENCY OUTPUT
Amplitude
Frequency
Output impe dance
Connector
POWER SUPPLY
M ains volta ge
Consumption
Ω
BNC
250 mVpp
1 kHz
10 k
Ω
EUROCONNECTOR
110-125-220-230/240 V AC ± 10%/50-60 Hz
8 W
OPERATING ENVIRONMENT CONDITIONS
M a x. a ltitude
Temperature range
M a x. re la tive h um idity
2000 m
From 5 ºC to 40 ºC
80% (up to 31 ºC), decreasing lineally up to 50%
at 40 ºC.
PHYSICAL FEATURES
Dimensions
Weight
ACCESSORIES INCLUDED
90901207 BNC/TV coaxial cable, CC-07
90901105 Mains cable, CA-05
Spare fuse, 5 x 20 mm, 250mA, F, 250V
VERSIONS
GV-298
GV-298/2
GV-298/4
GV-298/6
PAL B, G, H. CCIR channels
PAL DK. OIRT channels
PAL I. CCIR channels
PAL N. FCC channels
W.102 x H.90 x D.241 mm
2.250 kg
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2 SAFETY RULES
* This is a
corresponding
* Use this equipment only with
connecte d at ground potentia l or insulated from the ma ins
* This equipment can be used in
environments
* When using some of the following accessories
equipment, for safety reasons plug it to a supply line with the
class I
ground terminal
.
systems or devices with the negative measuring
.
Ca tegory II Instalations
and
Pollution Degree 1
.
use only the specified ones
ensure safety.
Power cord
* Observe all
specified ratings
both of supply and measurement
* Remember that voltages higher than 60V DC or 30V AC rms are dangerous
* Use this instrument under the
*
The use r is only authorize d to
specified e nvironmental conditions
carry out the following maintenance operations:
Replace the mains fuse of the specified type and value
to
On the Maintenance paragraph the proper instructions are given. Any other
change on the equipment should ve carried out by qualified personnel.
*
The me a suring negative
* Follow the
clea ning instructions
is at ground potential.
described in the Maintenance paragraph
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* Symbols related with safety:
DIRECT CURRENT
ALTERNATING CURRENT
DIRECT AND ALTERNATING
GROUND TERMINAL
PROTECTIVE CONDUCTOR
FRAME TERMINAL
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EQUIPOTENTIALLITY
ON (Supply)
OFF (Supply)
DOUBLE INSULATION PROTECTED
(Class II Protection)
CAUTION
(Risk of electric shock)
CAUTION REFER TO ACCOMPANYING DOCUMENTS
FUSE
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3 I N ST ALLAT IO N
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3. 1 P owe r re quirem en ts
This equipment requires a mains power source of 110-125-220 or 230/240 V
AC 50 to 60 Hz. Mains operating voltage can be selected at the rear panel.
Figure 1.-
Pull out the fuseholder lid.
1.-
Set the proper fuse for the desired mains voltage.
2.-
Insert the fuseholder lid so the
3.-
display
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[ B ]
.
Selection of mains voltage.
pointer faces the desired mains voltage
[ A ]
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CAUTION:
THE EQUIPMENT IS FACTORY SET FOR 220 V OPERATING VOLTAGE.
BEFORE SWITCHING ON THIS INSTRUMENT, SET THE VOLTAGE
SELECTOR TO THE PROPER POSITION AND BE SURE THAT THE FUSE
VALUE IS CORRECT.
FUSE TYPE SHOULD BE: 5 x 20 mm., 250 V, F, and:
250 mA FOR ALL VOLTAGES
AVOIDING THIS DIRECTIONS COULD DAMAGE THE EQUIPMENT
3.2 Installation
This unit is ready to be used as a desk-top equipment.
09/96 GV-298
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