Omega 24 User Manual
Page 17
Figure 6.4-Wire Resistance Measurement
Lead resistance errors are compensated for in 3-wire configurations. However full
compensation requires equal resistance in each lead. This configuration is common
with
100-ohm
RTDs.
In 4-wire configurations, accuracy is unaffected by lead resistance, and resistance
differences between leads.
NOTE: These instruments measure input voltages on all 4 terminals,
and are able to distinguish between 2-4 and 3-wire hookups. Switching
between these measurement modes is automatic.
2. Set instrument to METER mode.
3. Use the sensor-select key to set the instrument to the appropriate function and range.
NOTE: Due to limited display area, 100Ω and 1000Ω RTD’s are indicated on the
display by a momentary readout of “RTD-100” (or “RTD-1000”) when first selected.
Thermistors are identified by a momentary alpha-numeric readout of “Y-400” (signifying
YSI Series-400 type thermistor).
Any of these readouts can be recalled by turning the unit off and back on.
5. DATA LOGGING AND RECALL
Operating as a meter, the unit can save and recall up to 10 readings (each
with independent parameters: eg. °F/°C, TC-type and resolution) in random
access memory.
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