Tektronix 1730 Series, Instruction Manual

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1730–Series Operating Instructions
2–21
12. Horizontal Magnifier
Select the 2LINE SWEEP and center the horizontal sync on the screen. Press the
MAG button and note the magnification of the horizontal sync details. Push
SWEEP for 2FLD and MAG for X25 and note that the vertical interval is
displayed. See Figure 2-15. Note that the MAG button works with any SWEEP
selection. Push the MAG button to turn off the MAG.
13. Recall Setup
Set the 1730–Series for both CH–A and CH–B input, SWEEP to 1LINE, MAG
on, and VERTICAL GAIN to X5. Note front–panel indicators. Push the
RECALL SETUP 1 button and note that the front–panel setup changes.
NOTE. Do not attempt to STORE:
The Store function could also be checked; however, operating settings may be
stored in the memory location, and they would be overwritten with the new
front–panel information. For more information on how to use the Store function,
see CONTROLS and CONNECTORS in this section of the manual.
Graticules
There are three basic graticule patterns available for the 1730–Series. All three
are internal with edge illumination. The graticule used by both the 1730 and the
1731 PAL–M is a 525 line/60 Hz NTSC Composite scale. The 1731 PAL has
the CCIR 625 line/ 50 Hz graticule for the PAL color standard. The 1735 has a
dual graticule which accommodates both NTSC and PAL scales.
Because the internal graticule is on the same plane as the CRT phosphor it
eliminates viewing and photographic parallax errors. The graticule is illumi-
nated, using a front–panel SCALE adjust control, so that the level of graticule
brightness can be adjusted to optimum for viewing or photographing needs.
The major differences between the NTSC and PAL graticules are in the vertical
scales. In the paragraphs that follow each of the vertical graticule scales will be
discussed separately, while the horizontal scales are discussed together.
The NTSC graticule has two main vertical scales to facilitate typical measure-
ments. See Figure 2-16. The left side scale is marked in IRE units and extends
from –50 to +120 IRE in 10 IRE increments. An IRE unit is equal to 7.14 milli-
volts. Black level setup is denoted by a dashed line at 7.5 IRE.
NTSC Composite Video
Graticule Vertical Scales