Auto Menu Exit Count-Down Timer; Sonde Frequencies; Active And Passive Line Trace Frequencies - RIDGID SeekTech SR-20 Operator's Manual

SeekTech SR-20
Currently Available Active Line
Trace Frequencies
As with Sonde frequency categories, these items will ap-
pear in the "Checked-Active" set when checked.
Possible included frequencies are:
128 Hz*
1 kHz*
8 kHz*
33 kHz*
* = Set to "Currently Available" by default.
Currently Available Passive Line
Trace Frequencies
As with Sonde frequency categories, these items will ap-
pear in the "Checked-Active" set when checked.
Possible included frequencies are:
50 Hz 60 Hz 100 Hz
50 Hz x5 60 Hz x5 120 Hz
50 Hz x9 60Hz x9* <4kHz*
* = Set to "Currently Available" by default.
NOTE! Superscripts indicate harmonics; e.g., 60
540Hz and 50 Hz
Currently Available Radio Frequencies
As with other Sonde categories, these items will ap-
pear in the "Checked-Active" set when checked.
Possible included frequencies are:
4kHz-15kHz (L)*
>15 kHz (H)* (38 kHz maximum)
* = Set to "Currently Available" by default.
(See "Frequencies Selection Control" on page 25, to add
any frequencies to the Main Menu that do not appear on
it because they have not been set to "Currently Avail-
able" status.)
Change of Depth Units
The SR-20 can display Measured Depth in either Feet or
Meters (Figure 34). Feet are shown in feet and inches
format; meters are in decimal format. To change these
settings, highlight the Depth Units selection in the menu
and press the Select Key to toggle between feet or me-
ters. Use the Menu Key to save the section and exit.
22
x9 = 450 Hz.
Figure 33 – Selecting Units (Feet/Meters)
Back Light Control
A light detector built into the upper left corner of the
keypad senses low light levels. The backlight can be
forced on by blocking the light to this sensor.
The automatic LCD backlight is factory set to only switch
on under fairly dark conditions. This is to conserve bat-
tery power. As the batteries near depletion, the backlight
will appear dim.
To set the backlight to be always off, highlight the light
bulb icon in the tools section of the menu. Press the
x9 =
Select Key to toggle it between Auto, always ON and al-
ways OFF.
Figure 34 – Setting Backlight Mode (On/Off/Auto)
LCD Contrast
When this is selected by pressing the Select Key, the con-
trast can be adjusted (Figure 36). Use the Up and Down
Keys to make the screen lighter or darker. Extreme tem-
perature changes may make the LCD appear dark (hot) or
light (cold). Setting the contrast to extreme dark or light
may make the LCD difficult to read.
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