Tektronix 1740A · 1741A · 1745A
1750A · 1751A · 1755A · 1760 · 1761 · 1765
Combination Waveform and Vector Monitors, Discontinued
See: 1741C

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• Composite or Component Waveform Monitoring
• Composite Vector Display
• Picture Display
• Stereo Audio Display
• Time Code Phasing and Amplitude
• SCH and Color Framing Display
• Component Vector, Lightning, Diamond and Bowtie

Applications:

• Analog Baseband Video Monitoring for Broadcast and Post Production Applications

Each model in the series provides improved video performance and ease of operation and incorporates application specific features.  The family includes the 1740A Series composite analog waveform/vector monitors, the 1750A Series, which adds SCH and color frame verification capabilities, and the 1760 Series for mixed format component/composite applications.  (While the 1740A and 1750A do provide basic component waveform monitoring capabilities with parade and overlay displays, only the 1760 provides full component monitoring capabilities.)

The family features a common, straightforward operator interface, allowing the operator to take immediate advantage of the instrument's extensive feature set.  Each operating mode provides a full set of operating controls, clearly labeled and within easy reach.  Key controls are always available, with bezel buttons and knobs identified by intuitive on-screen labels.

Product Applications	1740A	1741A	1745A	1750A	1751A	1755A	1760	1761	1765
NTSC
PAL
Composite or component waveform monitoring
Composite vector display
Picture Display
Stereo audio display
Time code phasing & amplitude
SCH & color framing display							Opt. SC	Opt. SC	Opt. SC
Component vector, lightning, diamond & bowtie

All family members provide the following standard features:

Eight Video Inputs
Eliminate the requirement for external input selectors, reducing total system cost in many applications.  Since all eight inputs are connected directly to the instrument, signals may be paraded, overlaid or displayed in comparison modes not normally available with a simple external switcher.

Waveform
Monitoring is analog for maximum waveform fidelity.  There is no digital processing of the displayed signal.  The selected input may be displayed in one or two line or one or two field sweeps on a continuous basis or identified lines of any field may be selected and displayed.  Multiple inputs may be displayed at the same time or multiple filters may be applied to one input for signal analysis.  Time and Voltage cursors may be activated and positioned for reference or measurement.

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Composite Vectorscope
Functions demodulate and display the color components of the NTSC or PAL signal.  A microprocessor controlled phase shifter provides accurate vector positioning and eliminates readjustment when switching between internal and external reference modes.  Phase and amplitude cursors with on-screen readout allow system setup to reproduce specific chroma values and specific colors when luminance is similarly set using the waveform display voltage cursors

Stereo Audio Amplitude and Phase
Are Monitored using a calibrated L/R Lissajous display.  The operator can quickly see that the program audio will be properly reproduced on both monaural and stereo receivers.  Correct phasing between two audio channels is quickly verified by the direction of the display; signal level (left + right) is confirmed relative to the CRT graticule; and stereo separation (left - right) is displayed in quadrature to the level display.

Audio frequency -3 dB bandwidth is 200 kHZ.  Phase match between the left and right channels is better than 1 degree at 20kHZ.  Input is high impedance bridging, either balanced or unbalanced, to allow signal monitoring of existing audio circuits.

This display of stereo audio is intuitive and easy to use and has gained wide acceptance in new generation Tektronix vectorscopes.

Longitudinal Time Code
is monitored in a frame rate display to allow observation of amplitude, synchronization and phase with respect to reference vertical.  Synchronization is confirmed by the stationary display and time code phase is easily determined by horizontal position of the time code sync word on the CRT.

In the 1750A, or 1760 with SCH option,
Sub carrier/Horizontal phase and color framing are displayed graphically in the patented Tektronix polar SCH display.  Sync jitter over the field is displayed as a moving sync vector dot or displayed as a timing error at a vertical rate to identify the relationship over the field time.  Correct color framing is quickly verified by the position of the single sync vector dot relative to the color sub carrier vector when the monitor is externally referenced

User Interface:
Characteristic of current generation Tektronix instruments, an intuitive operator interface allows full instrument utilization with minimal reference to the provided user and maintenance manuals.  Operating modes, any of eight video inputs and key control knobs and buttons are always available for direct access from the front panel.

To keep operation easy and straightforward, the 1740A, 1750A and 1760 family "learns" the user's preferences for waveform, vector, and picture modes (and SCH in the 1750A and 1760 with the SCH option).  Returning to one of these modes restores the previous configuration.  Changes to a mode configuration are easily made using front panel buttons, supplemented by screen-labeled buttons and knobs.  Knob operations such as position, gain, phase, ect..,  are stored as well.

The 1740A/1750A/1760 family is easily configured for special monitoring applications, which may be stored in user presets for easy recall.  For example, a program line or off-air VITS may be set up as preset number 3.  Preset number 3 could be named and later recalled to display line 19 of the selected input in 2H sweep, with voltage cursors marking proper signal levels.  Other presets could be used to immediately access and display signals from other points in the system.  Different operators could quickly return to preferred monitoring setups after specialized signal checks.

With eight loop-through video inputs, the 1740A/1750A/1760 family is a versatile central point system monitor.  This capability is particularly useful in the production studio, where several machines, cameras, and composite input/output feeds are in use. 

As a machine monitor, the instrument may be operated from a central control panel, with waveform, vector (SCH and color framing with the 1750A Series and 1760 Series with SCH), audio, time code and servo signals easily observed. 

High Performance Design
The control system, based on Motorola's rugged MC68332 32-Bit microprocessor with internal co processing, facilitates instrument control and timing functions.  Flash EPROM's simplify updating the instrument to the latest firmware configuration. 

The 1740A/1750A/1760 family is based on completely new, high performance analog video system electronics.  Application Specific Integrated Circuits (ASICs), developed by Tektronix specifically to maintain signal fidelity in a television test instrument, handle internal signal routing and amplification.  Video Performance is tightly controlled providing confidence that the signal display accurately represents the signal under test

DC Offset (position match) between two or more displayed channels is within 1 IRE or 7 mV. Loop-through return loss is better than 40 dB to 10 MHz.

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Operational Flexibility
Eight loop through video inputs may be connected to the rear panel of the 1740A/1750A/1760 Series, eliminating the need for a dedicated routing switcher bus in many applications.  Any of these inputs may be selected alone or in combination from the front panel or via the RS-232 interface.  Input selection may also be included in preset configurations recalled via remote control connector. 

A separate external input may be selected to synchronize the display, allowing relative SCH and color framing comparison between two input signals or with the house reference.  Because a separate SCH evaluation is done on the reference signal, SCH and color framing displays are accurate over a wide input range.

Signal standards can be automatically selected, NTSC 525/60 or PAL 625/50, in dual standard 1745A/1755A/1765 models.  A CRT graticule suitable for both standards is provided.  A microprocessor controlled phase shifter may be activated to rotate the vector display to the correct position on the display.  Once set for each standard, the instrument displays the correct vector rotation when the video standard is changed.

A new universal input power supply is a part of these monitors.  AC mains in the range of 90 to 250V, 50 or 60Hz, are accommodated automatically.  This new power supply will also operate from a nonsinusodial supply, allowing battery operation using an external, high efficiency switching inverter.  A snap-lock power cord appropriate to the country of use is supplied with each instrument.

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