Chapter 4. Measuring and Recording Data
DMS Go Operator’s Manual
95
4.2.4
Setting the MAX GAIN MODE (MEASURE - MAX GAIN MODE)
The DMS Go always operates in Automatic Gain Control (AGC) mode: the gain is adjusted automatically by the instrument to get the echo
in the gate 4dB above the gate threshold. MAX GAIN MODE is used to select the maximum gain used by the AGC process:
•
HIGH:
the max gain is limited to a preset (different for each probe) high gain value (suitable for attenuative material like Stainless Steel)
•
LOW:
the max gain is limited to a preset (different for each probe) low gain value (suitable for less-attenuative material like Aluminum)
•
AUTO:
the instrument select the HIGH or LOW preset value automatically based on material velocity (the switch between HIGH and
LOW is at 6248400 mm/s = 246000 in/s to differentiate between steel and aluminum)
•
MANUAL:
the max gain is limited to the value set in “max gain” field (discussed on the next page).
To determine whether the gain should go high or low, complete the following steps:
1.
In the
MEASURE
menu, activate the
MAX GAIN MODE
submenu using the joystick (
).
2.
Move the joystick left or right (
) to select
AUTO,
HIGH
,
LOW
or
MANUAL
.
3.
After making your choice, move the joystick up or down (
) to navigate away from this function, or press F1
(HOME)
to return
to the Main Menu.
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