TABLE 3-2: EX10XXA MEASUREMENT RANGE
In addition to the standard thermocouple types, the EX10xxA can accept and measure a custom
thermocouple of any type. The effective measurement range in temperature is subsequently
determined by the input voltage range of the EX10xxA and the thermocouple transfer function of
the custom thermocouple.
In terms of voltage, the thermocouple connectors may only accept an input voltage of ±67 mV when
performing temperature conversion. When in voltage mode, these connectors can accept either
±0.067 V or ±0.1 V inputs. The voltage connectors may use either ±0.01 V, ±0.067 V, ±0.1 V,
±1.0 V, or ±10.0 V inputs for both EU temperature conversion or voltage measurements. When
temperature is selected, the instrument automatically switches the selected channel(s) to the ±67 mV
range. The EX1000A-TC is a special case where thermocouple inputs are used for voltage
measurement and may utilize all input ranges available to the voltage connectors. Table 1- provides
an overview of each models capabilities.
COLD JUNCTION COMPENSATION (CJC)
For highest accuracy and stability, the EX1000A-TC, EX1016A, EX1032A, EX1048A and RX1032
provide embedded isothermal input sections that are monitored by twelve precision thermistors
(based on Model#, number of thermistors may vary), one for every four thermocouple channels.
(Note, the EX1000A may utilize external thermistors as described in the Voltage Connections
section). To ensure that CJC information is current and time correlated with the input channels, CJC
channels are measured with every scan, providing a maximum time separation of less than 4 ms
between the input channel measurement and its associated CJC measurement. Table 3-3 shows the
association between the CJC and input channels.
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