Practical-instrument-electronics 830 Uživatelský manuál stáhnout pdf (Strana 17)

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MODE OFF LINEAR NONLINEAR SQ

ROOT

BURNOUT DOWN UP

LOOPSCOPE OFF ON

MODE - pressing the knob will cycle through OFF, LINEAR,

NONLINEAR. When setup to read pressure SQ ROOT replaces

NONLINEAR.

LINEAR turns on the mA display and regulates the loop

current linear with the input signal. For thermocouples &

RTDs this is linear relative to the temperature between zero

and span of the sensor input. This mimics the operation of a

digital temperature transmitter or other linearizing transmitters.

NONLINEAR (applies only to thermocouples and RTDs)

turns on the mA display and regulates the loop current linear

with base units (millivolts or ohms) of zero and span of the

sensor input. This mimics the operation of an analog

temperature transmitter without linearizing.

SQ ROOT turns on the mA display and regulates the loop

current with square root extraction of zero and span of the

pressure module input. This mimics the operation of a

differential pressure transmitter setup for square root extraction.

BURNOUT selects the failure mode of the calibrator when the

input signal is lost or beyond the input scale. Down sets the output

to 1.0 mA and UP to 21.5 mA when sensor failure is detected.

LOOPSCOPE turns on the Loop Diagnostic display which

simultaneously indicates the current, voltage and resistance

of the loop. When enabled the LOOPSCOPE also indicates

errors by flashing the LED and writing diagnostic messages

on the display. Messages include LOW LOOP VOLT, HIGH

LOOP VOLT and HIGH LOOP IMPED. With LOOPSCOPE on

the 830 occasionally performs a test on the loop. During this

short test the loop mA signal will be affected.

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Practical-instrument-electronics 830 Uživatelský manuál Strana 17