Ludlum Measurements 48-4203, Manual

Page: 55 / 100

7.7. SETUP MENUS 51
Audio Mode - Defines the enabled activity audio mode. This instrument has three audio
modes to choose from.
• "cLc" - Standard click audio. This mode will produce a cluck for every detected pulse.
If pulses are too fast, this can become a solid tone. Click audio is best for continuous
feedback.
• "SIG" - Sigma audio. Sigma audio takes a baseline reading at startup. If any subse-
quent readings are one sigma above the baseline, a steady pulse pattern will be heard.
The baseline can be taken if the OK button is pressed long enough for the shutdown
countdown to start. As soon as the shutdown countdown begins, the OK button can
be released and a new baseline reading will be taken. Sigma audio is best for find-
ing low-level increases from background radiation typically used with more sensitive
scintillator detectors.
• "F d" - Floating Delta. In this audio mode, the immediate reading is compared to the
running average. The running average is controlled by the response time. If the im-
mediate value is above or below n sigma (n is settable by software) from the average, a
pulse will be heard. Floating delta is best for finding changes, increases, or decreases
from existing readings.
Configurable positions are:
• Modes: ("cLc," "SIG," "F d")
Audio Volume - Simultaneously sets the audio volume of click audio (or other activity audio)
and alert/alarm volume. 0 mutes click and alert/alarm (see Audio on page 57).
Configurable positions are:
• Volume (0, 1, 2, 3)
ò
Activity audio and alert/alarm audio are available as separate settings via soft-
ware. Modifying the settings here will force them to the same value.
Shutdown delay on transition to external power - Determines the length of time before the
instrument turns off when external power is removed. Time is in seconds.
This setting is intended only for use when the instrument will primarily be used with external
power. If the external power is frequently turned on and off in a vehicle for example, the
instrument may need to auto-power off to conserve internal battery power.
A delay can be configured in the event engine cranking of the vehicle temporarily causes
the voltage to sag far enough that the instrument thinks power has been removed. This can
prevent unintentional power-off of the instrument.
June 2022