Practical Instrument Electronics 820 - Manual (Page 23)

Page 21
Read RTD Sensors
Choose this function to measure temperatures with an RTD
probe or sensor.
Move the power switch w to READ then Double Click the
EZ-DIAL knob to get into the Double Click Menu. Turn the knob
to scroll through the settings and press the knob to make your
selection. Select RTD for the FUNCTION, °F or °C for the UNITS
and RTD (Choose from one of Platinum 100Ω, or 1000Ω, Copper
10Ω or 50Ω, Nickel 120Ω or 110Ω curves). Note: Pt 100Ω 3850
is the most common RTD type. You must also select the WIRE
MODE for 2W, 3W or 4W to match the 2, 3 or 4 wires on the RTD
sensor.
Disconnect all wires from the sensor and connect the PIECAL
820 to the inputs of the device using 2, 3 or 4 wires.
Signals above the maximum scale are limited by protection
circuitry with “OVERRANGE” flashed on the display and the red
OVERLOAD LED lit.
The PIECAL 820 measures the input signal and constantly
updates the display with the current reading. Move the
EZ-CHECK switch
q to MAX to see the highest reading and to
MIN to see the lowest reading. Press and hold the knob e to
clear the MAX and MIN readings.
Process Calibrator
mA ∙ V ∙ TC ∙ Ω ∙ RTD ∙ Hz
SOURCE
HI
SET
LO
OFF
MAX
READ
MIN
READ
OVERLOAD Hz SYNC
Double Click
Menu
Push & Turn
for
Fast Dialing
Push & Hold
to
Store/Step
READ
Pt 100
α
=3850 °F
820.1
3W 2W 1W
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