Holland Electronics ST-5128S - Manual (Page 9)

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4. To adjust the contrast level of the LCD display:
1 Press the SET key (if not already in the settings screen).
2. Press the F3 (DOW) soft key to move the cursor to CON.
3. Use the 
keys to increase or decrease the contrast level.
4. Press the F4 (ESC) soft key to return to the single channel
measurement mode screen and the main menu.
5. To create or edit a custom user-defined channel list (optional):
The St5128s is equipped with 2 channel lists. The first ( preset) channel list
contains the standard USA CATV and VHF/UHF channel plans as shown in the
appendix at the end of this manual. The 2
nd channel list is the user-defined
channel list for storing up to 50 entries. This channel list is used in the
Multi-Channel Spectrum Measurement Mode. To create or edit a user-defined
channel list use the following steps:
1. Press the SET key (if not already in the settings screen).
2. Press the F3 (DOW) soft key 3 times to move the cursor to the UNIT:
prompt. The cursor will appear on the channel editing line.
3. Use the 
keys to select a unit (line) number for the new entry in
the user-defined channel list.
4. To enter a channel from the standard channel list, using the numeric
keypad, enter the channel number that you wish to record, and then
press the CH key to store the entry. The corresponding frequency of
the channel appears to the right of the CH: prompt.
5. You may also enter any frequency using the numeric keypad, and then
press the MHz key to store the entry.
6. To make additional entries in the user-defined channel list, repeat
steps 3-5.
7. To edit or review the list, use the 
keys to scroll through the list.
You may delete any entry by scrolling to the unit (line) number and
then pressing the TEST key.
8. Press the F4 (ESC) soft key to return to the single channel
measurement mode and main menu.