User manual TEKTRONIX 1740

[. . . ] User Manual 1740A/1750A Series Waveform/Vector Monitor 070-8470-06 This document supports firmware version 2. 2 and above. www. tektronix. com Copyright © Tektronix, Inc. and foreign patents, issued and pending. Information in this publication supercedes that in all previously published material. Specifications and price change privileges reserved. [. . . ] With VOLT selected, use the left bezel control to position the VOLT1 cursor at the upper excursion of signal to be measured, and the center bezel control to position the VOLT2 cursor at the lower excursion. The on-screen readout gives the voltage difference between the two levels. When GAIN is changed, the voltage cursors maintain their relationship with the signal. For example, if the VOLT2 cursor were set to the signal sync tip in X1 GAIN, it would also be at sync tip in X5 gain, X10 gain, or with VAR gain on. Timing Cursors can be used to make accurate time measurements. When TIME is selected, position the TIME1 cursor at the left excursion of the signal to be measured, and the TIME2 cursor on the right. The on-screen readout gives the time difference between the two points. When MAG is selected, the timing cursors maintain their relationship with the signal. For example, if the VOLT1 cursor were set to the rising edge of sync, it would also be set there with MAG selected. When MARK is selected, use the bezel controls to vertically position the markers where desired with respect to the graticule markings. These markers are designed to be used for reference points; there is no amplitude readout. The markers are not affected by GAIN changes; if a marker were set to 100 IRE in X1 GAIN, it would still be set to 100 IRE with the MAG on. 1740A/1750A Series Waveform/Vector Monitor User Manual 3-13 Using the Menus Line Select Menu Pushing the LIN SEL menu button enables the line select mode and provides the line select menu display. The middle bezel control is assigned to select the line number. The following choices can be made using the bezel buttons. 1740A-- Series H H H FIELD -- ALL or 1of 2 1H or 15H (one line or 15 lines) NEXT FIELD -- (appears only when 1of 2 FIELD is selected. ) Push the bezel button corresponding to NEXT FIELD to sequence through the fields designated by the FIELD selection. A box flashes momentarily around the on-screen label to verify that the selection has been made. 1750A-- Series H H H FIELD -- ALL or 1of2 or 1of 4 or 1of8 1H or 15H (one line or 15 lines) NEXT FIELD -- (appears only when 1of 2, 1of4, or 1of 8 FIELD is selected. ) Push the bezel button corresponding to NEXT FIELD to sequence through the fields designated by the FIELD selection. H ALT 2 FIELD -- (appears only when 1of 4 FIELD is selected. ) Push the bezel button corresponding to ALT 2 FIELD to toggle between the current field and the second next field; for example, FIELD1 and FIELD3. H ALT 4 FIELD -- (appears only when 1of 8 FIELD is selected. ) Push the bezel button corresponding to ALT 4 FIELD to toggle between the current field and the fourth next field; for example, FIELD1 and FIELD5. 3-14 1740A/1750A Series Waveform/Vector Monitor User Manual Using the Menus When bezel buttons corresponding to NEXT FIELD, ALT 2 FIELD, or ALT 4 FIELD are pushed, a box flashes momentarily around the on-screen label to verify that the selection has been made. Readout The line select readout (in the upper left of the CRT) consists of field followed by line number. When 15H is selected, the readout also displays the range of line numbers. For example, select FIELD 1 and 15H, and rotate the LINE SEL control to line 34. This provides a readout of field 1, lines 34 through 48: F1 34 F1 48 Line Select Functions All of the other menus are functional during line select operation. The line select menu display disappears when another menu is selected, but the selected line and field are displayed until the line select menu is exited. [. . . ] The phase of one of the color difference signals alternates from line to line to help cancel out phase errors. Quadrature AM A process which allows two different signals to modulate a single carrier frequency. The two signals of interest Amplitude Modulate carrier signals which are the same frequency but differ in phase by 90 degrees (hence the Quadrature notation). The two resultant signals can be added together, and both signals recovered at the other end, if they are also demodulated 90 degrees apart. G-6 1740A/1750A Series Waveform/Vector Monitor User Manual Glossary Quadrature Distortion Distortion resulting from the asymmetry of sidebands used in vestigial sideband television transmission. Quadrature distortion appears when envelope detection is used, but can be eliminated by using a synchronous demodulator. RF Radio Frequency. [. . . ]