Specifications

General Operation
VTM Series Installation and Operation Handbook
3-49
• EXT REF – Reflects current setting of External Reference (selected by pressing
and holding the EXT button)
• INPUT A – Internal Reference fixed on Input A.
• INPUT B – Internal Reference fixed on Input B.
• INPUT C – Internal Reference fixed on Input C (Option required).
• INPUT D – Internal Reference fixed on Input D (Option required).
• LTC – Longitudinal Time Code
Timing Mode
The Timing mode selection is used to set the offset of the reference to the signal.
When offset is applied against the reference, OFFSET is shown in the lower right
corner of the Timing Pane. REF (Reference), located in the center of the timing
display, indicates the Offset from the 0 REF point when Offset is applied. REF is
green when the line and µsec (microseconds) cursors are all aligned with the Offset
reference. As the signal falls out of timing alignment with the Offset reference, the line
and the µsec cursors change color when it moves from REF. The Timing Mode
Selections are:
• Factory – Sets the factory reference to 0 REF. When FACTORY is selected, the
OFFSET field does not appear on the screen.
• Offset – Enables and displays the Offset field. The reference offset is not applied
until SET ZERO REF is selected.
• Set Zero Ref – Applies the current offset setting as the Zero REF point.
• Clear Zero Ref – Clears the setting applied in the SET ZERO REF menu and
returns the Reference to the Factory Reference Setting. Offset remains on the
screen.
Alarm Display
Press the ALARM button to display the alarm display. Pressing and holding the
ALARM function button opens the Alarm Pane menu. The default alarm display is the
Alarm Log display. The Alarm Status pane can also be selected from the Alarm Pane
menu. For information on individual alarms, see Setting Alarms and Alarm
Descriptions in Section 5.
Alarm Log Display
The Alarm Log display lists all the alarms, the date, time, time code, duration, and
peak value. The alarm list begins with the most recent alarm and can hold a maximum
of 200 alarms.
An Alarm Log display diagram is shown in Figure 3-39 and described in Table 3-29.
The diagram illustrates the general location for the various alarm fields.