This topic applies only to 34460A/61 DMMs. For temperature measurements using the 34465A/70A, see Temperature (34465A and 34470A).
This section describes how to configure 2-wire and 4-wire temperature measurements from the front panel.
Step 1: Configure the test leads as shown.
| 2-wire Temperature: |
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4-wire Temperature: |
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Step 2: Press [Temp] on the front panel. The following menu appears.
Step 3: Press Probe and choose the probe type. If you choose to use an RTD, the menu will have a softkey to specify the RTD's resistance at 0 degrees Celsius (R0).
Step 4: For 2-wire measurements, an Auto Zero softkey is available.
Auto Zero: Autozero provides the most accurate measurements, but requires additional time to perform the zero measurement.With autozero enabled (On), the DMM internally measures the offset following each measurement. It then subtracts that measurement from the preceding reading. This prevents offset voltages present on the DMM’s input circuitry from affecting measurement accuracy. With autozero disabled (Off), the DMM measures the offset once and subtracts the offset from all subsequent measurements. The DMM takes a new offset measurement each time you change the function, range, or integration time. ( There is no autozero setting for 4-wire measurements.)
Step 5: Press Aperture and choose the number of power-line cycles (PLCs) to use for the measurement. Only 1, 10, and 100 PLC provide normal mode (line frequency noise) rejection. Selecting 100 PLC provides the best noise rejection and resolution, but the slowest measurements:
Step 6: Use the Units softkey to display temperature in degrees Celsius, degrees Fahrenheit, or Kelvin.