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Setting up a passband around a setpoint is
often used for component testing. Deviation
limits are programmed by entering menu item
dEU1b for Alarm 1 and dEU2b for Alarm 2.
The deviation band will be equal to two limits.
Display Blank A rear panel input which blanks the display
when the input is tied to logic ground by a
switch or 0V is applied (logic level true). The
meter display will light when the input is open
or is held at +5V (logic level false).
Extended Meter
A meter with an enhanced microcomputer that provides added capabilities,
such as linearization of nonlinear inputs and display of rate of change from
successive readings.
Full Scale The maximum input signal range for which the meter has been configured. For
example, the most sensitive full scale for the load cell meter is ±20 mV (signal
range from -20 mV to +20 mV).
Function Reset
A rear panel control input which resets Peak, Valley and any latched alarms
when the input is tied to logic ground by a switch or 0V is applied (logic level
true). To reset the value again, the input must be open or 5V applied (logic
level false) and then set low.
Ground Loop A closed conductive path in external ground wiring that allows stray currents to
flow in ground wiring, creating ground noise. The meters in this manual mini-
mize ground loop problems by mutually isolating the grounds associated with
meter power, signal input, and all output and communication options.
Jumper A push-on component which provides a short between two adjacent posts on a
circuit board. Jumpers are used to configure the load cell signal conditioner
board for specific full scale ranges, and to configure power supply and commu-
nications boards for various modes of operation. Unused jumpers are stored by
pushing one side over an unused post.
Hysteresis Band
A band which controls relay action symme-
trically around a setpoint. The relay closes
(or opens) when the reading goes above
the setpoint plus one hysteresis limit, and
opens (or closes) when the reading falls
below the setpoint less one hysteresis limit.
A narrow hysteresis band is often used to
minimize relay chatter around a setpoint
due to electrical noise or signal feedback
caused by load switching. A wide hysteresis band can be used for control
applications, such as turning on a fill pump when the tank level has reached a
lower limit and shutting off the pump when the tank level has reached an upper
limit. The hysteresis band will be equal to two hysteresis limits.
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