RIGOL Chapter 1 Test Overview
1-4 DM3068 Performance Verification Guide
Test Conditions
For the best performance, all the test processes should fulfill the following recommendations.
1. Always operate the instrument under a proper voltage.
2. Make sure the ambient temperature during the test is stable and within 18°C and 28°C.
3. The relative humidity should be lower than 80%.
4. Warm up the instrument for at least 90 minutes before testing the instrument.
5. Use a copper connector to reduce its thermoelectric potential effect.
6. Use Teflon shielded twisted pair (as short as possible) in order to reduce the effect of external
interference. In the process of capacitance test, a coaxial cable should be used 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 DM3068 is a high-precision measuring instrument, special attention should be paid to the additional
error caused by the calibration source and calibration operations. In ideal situation, the accuracy of
the verification test and calibration standard source must be at least four times higher than that of the
test instrument.
When performing the gain calibration for DC voltage, DC current and resistance, the “0” output of the
calibrator must be correct. In order to reduce the errors caused by the connecting cables, adequate
warm-up (about 5 minutes) must be done before each reconnection of the cables or short-circuiter.
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