FAA-28, Technical Manual, Rev.1.1.0
February 2022
Page 10 of 21
4. Adjustments
4.1
Adjustment with Rotary Switches
To start the adjustment the programming switch should be at analog output type
position,
V
or
I
.
Z
and
G
positions of the programming switch are used for performing zero and gain
adjustments in sequence. Analog output is changed by turning the adjustment switch
as described in the table below.
Adjustment rotary
switch position
Rotary switch description
Run
LED
No change, operation mode
On
Decrease ( - ) / Increase ( + ) in slow steps
Flash
Decrease ( - ) / Increase ( + ) in medium steps
Flash
Decrease ( - ) / Increase ( + ) in big steps
Flash
RUN LED flashes to indicate the instrument is not in operation mode.
Zero Adjustment
•
Connect the measurement instrument (Multimeter is recommended) to the
analog output
•
Unload the scale (the scale must be empty)
•
Turn the programming switch to the
Z
position from the analog output type
position
•
Increase or decrease the analog output by adjustment rotary switch.
Never bring the adjustment switch to
position in this adjustment. Turn the
adjustment switch to
0
- position at the end of the adjustment.
•
Turn the programming switch to analog output type position (
V
or
I
) to start the
operation mode or to the
G
position to start gain adjustment
Gain Adjustment
•
Connect the measurement instrument (Multimeter is recommended) to the
analog output
•
Load the scale with a known load
•
The analog output value should be calculated for the applied load
