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(10) After SPAN calibration is finished, TW SPAN (Tweak Span) is displayed. If an ex-
tremely fine adjustment of SPAN is not required, press PRINT and skip to step (11). If
a fine adjustment is required, turn to Section 4.2 to complete the calibration procedure.
(11) RE-ZERO. This function is used mainly when the calibration procedure requires a
hook or chain to hang the test weights on the scale. RE-ZERO is designed to remove
the weight offset of a chain or hook from the IQ plus 310A zero band. To perform the
RE-ZERO, clear the platform of all weight, including the chains or hooks used. While
the indicator is prompting RE-ZERO, press TARE (Enter). The message *CALIB*
appears. Do not disturb the platform until the RE-ZERO is finished.
(12) Return the Operate/Setup Switch to the OPERATE position and install the switch
cover and legal seal according to directions in Section 4.3
4.2 FINE-TUNING (TWEAKING) SPAN and RE-ZERO
(1)
While TW SPAN is displayed, press the down arrow (GROSS/NET) key. The number
displayed next is the test weight with an extra decade of resolution. No decimal point
or dummy zeros are shown.
(2)
Press the up (ZERO) and down arrow (GROSS/NET) keys to make a fine adjustment
to this test weight. If you press and hold either key, the value will increment by 0.1
grad intervals.
(3)
Press TARE to store the result. RE-ZERO is displayed. RE-ZERO removes the
offset of test weight hooks and re-centers the zero band.
(4)
Remove all test weights and hooks from the scale.
(5)
Press TARE. The message *CALIB* appears. Do not disturb the platform until fin-
ished.
(6)
Place the Operate/Setup Switch in the OPERATE position and install the switch cover
and legal seal according to directions in Section 4.3.
4.3 INSTALLING THE LEGAL-FOR-TRADE SEAL
All hardware for this procedure is supplied in the Accessory Kit.
(1)
Set the Operate/Setup Switch to
the OPERATE position.
(2)
Remove the backing from the
switch cover gasket and apply
the gasket to the switch cover.
(3)
Install the switch plate as shown
and tighten hardware to 6 lb-in.
(4)
Thread the wire for the seal
through the holes in both stand-
offs and twist the ends of the wire
together.
(5)
Install the seal on the wire loop
as shown in Figure 20.
26
Cap Nut
Service Switch
Cover
Wire
FIGURE 20 – LEGAL SEAL INSTALLED
Drilled Standoff
Legal Seal
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