DayTronic 3000 series, Instruction Manual

Page: 19 / 30

Model 3178
R and C BALANCE Controls: These controls are used to set the output
to zero when the transducer is unloaded.
NULL Pushbutton: This pushbutton is pressed when nulling the trans-
ducer bridge with the R and C BALANCE controls. It provides for
non-synchronous demodulation of the carrier for balancing purposes.
After a minimum reading is obtained on the display device by adjusting
the C control, the pushbutton is released and the output is zeroed using
the R controls.
SPAN Controls: The Coarse and Fine SPAN controls are used to set the
output to the dead weight value when dead weight calibration is used.
They can also be used to set the output to the Equivalent Input value
when the CAL (+ or –) button is pressed.
CAL Pushbuttons: The + and – CAL pushbuttons provide for shunt
calibration in the positive and negative realms, respectively. They are
used in conjunction with the SPAN controls to calibrate the instrument.
When both positive and negative realm calibration is required, the
+CAL button is used in conjunction with the SPAN controls and the
–CAL button is used with the internal
Symmetry adjustment.
Figure 5. Front-Panel Description
12