Wesmar HD800/110-10, Installation & Operation Manual

Page: 88 / 100

Page 88
WESMAR
HD800
PART A: CALIBRATION
All HD800 sonars are calibrated at the WESMAR factory in
our test tank before shipping. However, WESMAR does rec-
ommend checking adjustments after installation. A sonar that
is correctly adjusted will give maximum range performance.
Before proceeding with calibration, set the sonar to the
following settings:
Menu 1:
1. Screen Mode Full
3. Noise Filter None
4. Target Filter Off
Menu 3:
5. "A" Colors Select 8
Use the Function Knob on the front panel and select:
Speed 1
Power 100%
Pulse 100%
TVG Correct number for frequency
Threshold 3
1.0 POSITIVE 5 VDC ADJUST
(CONSOLE)
Connect the positive lead of a Digital Volt Meter (DVM),
to the back side of R20 (see console drawing for location).
Connect the Negative Lead of the DVM to the TP1 or the
back panel.
Adjust RV2 for a Positive 5.1 VDC.
Note: This adjustment affects TVG Offset, next step. Both
adjustments must be done in order.
2.0 TVG OFFSET (CONSOLE)
Connect the positive lead of DVM to TVG output, blue wire
labeled "Y", located to the right back of the console circuit
board. Connect the negative lead to "TP1," receiver ground,
located right front of the console circuit board.
Set both Near and Far Gains of Sonar A to zero, counter-
clockwise.