VEGA VEGASON 71 - 2 … 75 - 2 - Manual (Page 51)

Limitation of the echo gain
71 - 2 … 75 - 2 51
Max. gain MODE 1 - 20 … 1 - 22
By using the whole gain, the pulse echo measuring
system tries to detect an echo. This means that in
empty vessels the gain can be bigger than required
for the useful echo.
This is why sound reflections are detected as false
echoes. Therefore it is necessary to limit the control
range of the gain.
Note:
-
The limitation is adjustable from 0.03 V to
4.50 V, as optimization up to 4.95 V.
- The optimum adjustment of this mode is only
possible with empty vessel.
- For orientation a d is displayed as long as an
echo (false echo) is detected with actual gain.
Programming example:
Indication of echo gain ............................................. • select mode 1 - 20 in MODEFIELD
• e.g. 2.00 is indicated in the PARAMETER FIELD,
i.e. a false echo is detected with a gain of
2.00 Volt
Limitation .................................................................. • select mode 1 - 21 in MODEFIELD
• program as limitation in PARAMETER FIELD e.g.
2.30
• then store with STO-button
Optimization ............................................................. • select mode 1 - 22 in MODEFIELD
• e.g. d 2.30 is displayed in the PARAMETER
FIELD
• activate the optimization with MOD-button
• optimize with Plus-button the gain as long as the
d extinguishes
(the optimization is made in 0,02 V-steps)
If during the optimization a modification to the
opposite direction is required, this can be made
with the minus button.