Chapter 1 Calibration Overview RIGOL
DM3058/DM3058E Calibration Guide
5. Use copper connectors to reduce the effect of thermoelectric potential.
6. Use Teflon shielded twisted pair (as short as possible) to reduce the effect of
external interference. When making capacitance verification and calibration, use
coaxial cable to minimize the external interference and noise.
7. Ground the shield of the twisted pair and the shield of the coaxial cable. Unless
otherwise noted, ground the LO terminal of the calibrator.
As DM3058/DM3058E digital multimeter is a high-precision measuring instrument,
special care should be paid during the verification and calibration to avoid causing
additional error. Ideally, the accuracy of the standard source of the verification and
calibration should be more than 5 times higher than the accuracy specification of the
test instrument.
When performing the DC voltage, DC current and resistance gain calibrations, the "0"
output of the calibrator must be correct. To reduce the error caused by the connecting
cable, the connecting cable must be adequately warmed up (for about 5 minutes)
each time when the connecting cable or the short-circuiter is re-connected.
Input Connection
For the zero point calibration, please use copper or copper alloy low thermoelectric
potential 4-terminal short-circuiter. For the capacitance calibration, please use coaxial
cable and connect its shielding layer with the LO terminal. For the calibrations of the
other functions, please use Teflon shielded twisted pair (as short as possible) to
connect the multimeter and calibrator; the HI and LO terminals must be connected
with twisted pair; the HI-Sense and LO-Sense terminals must be connected with the
twisted pair. The shielding layer of the cable must be connected to the reference
ground. This kind of connection can reduce the effect of the thermoelectric potential
and external interference.
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