Voltage and Temperature Measurements 2-3
Measurement overview
The Model 2182 provides two input channels for DC voltage and temperature measurements.
Table 2-1 lists the measurements that can be performed by the two channels.
NOTE Measurement queries are used to trigger and/or return readings. Details are provided
in Section 7, Section 13, and Appendix H.
Channel 1 is used as the fundamental measurement channel, while Channel 2 provides sense
measurements. Because of this operational relationship between the two channels, Channel 2
cannot be used as an independent, stand-alone measurement channel. Its inputs must be
referenced to Channel 1 LO.
NOTE As a general rule, use Channel 1 whenever possible for low voltage (<1V)
measurements. If using Channel 2 for measurements below 1V and the impedance
between Channel 2 LO and Channel 1 LO is
≥
100k
Ω
, pumpout current could be high
enough to corrupt measurements. For details, see “Performance considerations,
Pumpout current (low charge injection mode)” (in this section).
Voltage measurements
The Model 2182 has two voltage measurement functions: DCV1 and DCV2. DCV1 is
available for input Channel 1, and DCV2 is available for Channel 2.
DCV1 (Channel 1) has five measurement ranges (10mV, 100mV, 1V, 10V, and 100V) and can
measure voltage from 1nV to 120V. DCV2 (Channel 2) has three measurement ranges (100mV,
1V, and 10V) and can measure voltage from 10nV to 12V. Accuracy for each channel is listed
in the specifications (Appendix A).
Temperature measurements
The Model 2182 has two temperature measurement functions: TEMP1 and TEMP2. TEMP1
is available for input Channel 1 and TEMP2 is available for Channel 2.
Depending on which thermocouple type is used (J, K, T, E, R, S, B, or N), the Model 2182
can measure temperature from -200˚C to 1820˚C. The specifications (Appendix A) provide the
measurement ranges for the various thermocouple types.
Table 2-1
Measurement channels
Measurement Input Channel(s) To Use
Voltage Channel 1
Temperature Channel 1
Voltage and Voltage Channel 1 and Channel 2
Voltage and Temperature Channel 1 and Channel 2
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