User`s guide

VersaTools
®
MTP 15HD A Series • InstallationVersaTools
®
MTP 15HD A Series • Installation
VersaTools
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MTP 15HD A Series, cont’d
VersaTools
®
MTP 15HD A Series • SpecificationsVersaTools
®
MTP 15HD A Series • Skew Delay Compensation
For best results when using an RL receiver, connect a
load to the receiver’s buffered output before adjusting the
level.
3
Peaking control — Peaking affects the sharpness of a picture.
Increased peaking can compensate for mid- and high-frequency
detail loss from low bandwidth system components or
capacitance in long cables. The minimum setting (at the
counterclockwise limit) provides no peaking. The maximum
setting (at the clockwise limit) provides 100% peaking. Adjust
this control to obtain the optimum picture sharpness.
For best results when using an RL receiver, connect a
load to the receiver’s buffered output before adjusting the
peaking.
4
Select button — This recessed button selects the red, green, or
blue video signal to adjust and resets all three video signals to a
skew delay of zero nanoseconds.
Use a Tweeker or other small screwdriver to press and release
this button to cycle among selecting the red, green, or blue
video signal to adjust. The selected signal is indicated by the
Red, Green, and Blue LEDs (
5
).
The SEQ receiver automatically saves the setting for the
video signal that is being deselected when you push this
button or when the selection times out after 10 seconds.
Press and hold this button for approximately 3 seconds to set
the skew delay for red, green, and blue to zero. The Red, Green,
and Blue LEDS (
5
) all turn off. Release the button.
5
Red, Green, and Blue LEDs — These LEDs indicate the video
signal that is selected by the Select button (
4
) for skew
adjustment using the Adjust control (
6
). The LED for the
selected color flashes when the skew compensation for that
color’s video signal has reached the minimum or maximum
limit.
6
Adjust skew control — This control delays the selected red,
green, or blue video signal by up to 62 nanoseconds. The delay
is applied in incremental, 2-nanosecond steps. Rotate the
control counterclockwise to reduce the delay or clockwise to
increase the delay.
The Adjust control’s movement is smooth; it does not
have mechanical steps or high- and low-limit stops.
Watch the displayed image to observe the steps of delay.
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The selected Red, Green, or Blue LED (
5
) flashes to
indicate that the control has reached the minimum
(counterclockwise rotation) or maximum (clockwise
rotation) limit.
Skew Delay Compensation
CAT 5 TP cable can lead to registration errors between the red,
green, and blue video signals. Pair skew can be measured with
test equipment or identified by viewing a crosshatch test pattern
with a critical eye to determine if either the red, green, or blue
video image leads (appears to the left of) the other two video
images.
Unless the TP cable is changed, the skew adjustment
should need to be made only once, during installation.
SEQ receiver skew compensation
The SEQ receiver has built-in skew compensation capabilities.
Adjust the equalization as follows:
1. Zero the skew delay for red, green, and blue as follows:
a. Use a Tweeker or other small screwdriver to press
and hold the Select button for 3 seconds. The Red,
Green, and Blue LEDS all go out.
b. Release the Select button.
2. Use UTP cable test equipment or examine the displayed
video image with a critical eye to determine which video
signal — red, green, or blue — is most shifted to the left.
A crosshatch test pattern or a black background with
vertical white lines is ideal for determining skew.
3. Adjust the leftmost video signal as follows:
The SEQ receiver cannot shift the rightmost video
image to the left.
a. Use a Tweeker or other small screwdriver to press
and release the Select button until the LED lights for
the left-shifted color — Red, Green, or Blue.
b. Slowly rotate the Adjust control clockwise while
monitoring the display. Observe that the leftmost
color shifts rightward one step at a time. Continue to
rotate the control until that color is properly
converged.
A 2-nanosecond adjustment is very fine. Up to 10
nanoseconds of delay may be necessary before you detect
a change in the display.
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