Practical Instrument Electronics 820 - Manual (Page 29)

Page 27
Thermocouple Read
Accuracy & Cold
Junction Compensation
Same as Thermocouple Source
Input Impedance > 1 Megohms
Open TC Threshold;
Pulse
10K Ohms; <5 µamp pulse for 300
milliseconds (nominal)
RTD, OHMS and Continuity Read
Resistance Ranges
0.0 to 401.0, 0 to 4010 Ohms
Accuracy ±(0.03% of Full Scale + 0.075 Ohms)
Excitation Current 1.0 mA to 401 Ohms, 0.6 mA to 4010
Ohms (nominal)
Continuity 0.0 to 401.0 Ohms; Beeps from 0.0 to
100.0 Ohms
RTD and OHMS Source
Accuracy
From 1 to 10.2 mA
External Excitation
Current
Below 1 mA of External
Excitation Current
±(0.03% of Full Scale + 0.075 Ohms)
±(0.03% of Full Scale+0.075 Ohms +
Resistance Ranges 0.0 to 410.0, 0 to 4001 Ohms
Allowable Excitation
Current Range
<410 Ohms: 10.2 mA max; steady or
pulsed/intermittent
410 to 4001 Ohms: 1 mA max; steady or
pulsed/intermittent
Pulsed Excitation
Current Compatibility
DC to 0.01 second pulse width
0.025 mV
mA Excitation Current
)
Specifications