Rice Lake Z6 Single-Ended Beam, SS Welded-seal, IP67, OIML C3 - Manual (Page 17)

Load Cell Trimming 13
8.3 Signal Trim
This form of trimming first appeared as an alternative to
excitation trimming for indicators with gated power supplies.
Because of the compatibility that signal trimming has with
virtually all indicators and its relative immunity to temperature
and vibration problems, signal trimming is gaining popularity for
all installations. It involves adding a relatively high parallel
resistance between the signal leads of each load cell as shown
in Figure 8-2. The added parallel resistance creates a “leakage
path” that shunts some of the available load cell signal away
from the indicator. The larger this parallel resistance, the more
signal available to the indicator from the load cell. Conversely,
the smaller this parallel resistance, the less signal available to
the indicator from the load cell.
Figure 8-2. Signal Trimming Procedure
TRIM POT
EXCITATION
SIGNAL
+
−
+
−