Level Meter Main Menu - Tektronix VM700T User Manual

Measure Mode

Level Meter Main Menu

2–84
NOTE. Measurement units of IRE are the default when using the System Default
Measurement Location file. If you want to see units in mV, you must create
editable files for Measurement Locations and Video Source. In the editable
Measurement Locations file, change the amplitude units to volts; in the editable
Video Source file, change the source selection to the new Measurement Locations
file name. See the VM700T Operator's Manual, Configuring the VM700T, for
further information on creating, editing, and selecting user-created configura-
tion files.
The max. and min. points of the measurement window and the reference pointer
for the display are easy to set up using the menu choices under the Display
Limits soft key, and you can quickly select the measurement points on a
waveform using the menu choices under the Measure Position soft key.
Pressing the Menu button with the Level Meter running displays the Level Meter
main menu. The menu tree is shown in Figure 2–47.
Main Menu
Average
Num
averaging. The Average Num range is 1 to 256. The default
value is 32. To change the Average Num value, touch the
Average Num soft key to highlight it, rotate the control knob
until the desired weighting factor appears; then touch the
Average Num soft key again. The effect of increasing the
number used for averaging is that more time is required to
arrive at a final value, but the readings become more stable as
any noise variations of signal level are averaged out.
Display
Limits
reference limits seen in the Level Meter display of Figure 2–48.
Provision are available for setting the minimum and maximum
amplitude values for the measurement window, and for setting
a measurement reference pointer. The Expand and Move feature
works on the vertical axis to permit a Level Meter display to be
set up to monitor a level measurement of a video signal over a
wide range of resolution and amplitudes.
VM700T Video Measurement Set Option 01 NTSC Measurements
specifies the weighting factor to use for
calls up a menu for setting the Level Meter