Tektronix TSG 90 PATHFINDER, Service Manual

Page: 36 / 94

Operating Information
2–4
TSG 90 PATHFINDER Service Manual
Rev Apr 1994
button. The ID Menu allows the ID cycle to be turned on or off, sets the display
time for the captions, and selects which of the stored ID messages to cycle in
what order.
ID Edit and ID Position.
Pressing the ID Edit button enters a mode where the
current ID text can be edited. Editing occurs off-line, in an edit buffer, so any
displayed messages are not affected. When finished editing, pressing the Enter
button saves the ID from the edit buffer as the current ID, and the new text is
inserted into the video signal, unless the ID cycle function is in use.
The ID Position mode (Shift–ID Edit) allows positioning of the message on
screen. The H and V readouts on the LCD display allow the operator to deter-
mine where the message is being positioned, even if there is no video display
available. The H value shows how many letter spaces from the left edge the mes-
sage starts. The V value shows the character line that the first line of text occu-
pies. If the first line of text is placed into the vertical interval, the LCD display
will read V=vert.
Tone On/Off and Tone Menu.
The Tone On/Off button toggles the audio tone on
and off. When Tone is On, the LCD display will display the selected audio level
(i.e. Tone=4dB). The Tone Menu (Shift–Tone On/Off) is used to select the tone
frequency, select the audio level (0, +4, or +8 dBu), and to turn the audio click
on and off.
The tone frequency menu will select one of 13 fixed frequencies between 50 Hz
and 20 kHz, or a 50 Hz–20 kHz audio sweep. This sweep signal is composed of
27 separate frequencies, more than double the number of specified fixed frequen-
cies. While in the tone frequency menu, with sweep selected (displayed on the
LCD readout), pressing the ENTER key will stop the sweep and the PATHFIND-
ER will continue to output the frequency it was producing when the ENTER key
was pressed. The display will change from SWEEP 50–20K to SWEEP
PAUSED. This is useful for checking a problem noticed at a particular frequency
while sweeping, and also allows the use of frequencies not specifically addressed
in the Tone Menu. Pressing the ENTER key again will restart the sweep.
Recall and Store. The Recall button allows the user to recall one of eight user
defined IDs or four user presets. In this mode, the left/right arrows select the ID
or preset number, and pressing ENTER will then recall it. The up and down
arrow buttons may be used to view the 2nd line of the text message before
recalling.
Store is used to store the current ID text, with an assigned ID number, or it will
store the current text and instrument settings as a User Preset.