Specifications

RIGOL Chapter 3 Performance Test
Service Guide for DM3058
3-4
Input Connections
4-teriinal shortcircuiter which is made of copper or copper alloy with low thermoemf
must be used for zero offset test. Coaxial-cable is adopted when calibrating
capacitance whose shielding layer is connected with LO terminal. For the other
calibrations, please use Teflon Shielded Twisted Pair with isolation as short as possible
to connect with the Multimeter or calibration instrument; both HI and LO must be
twisted pair, and also for HI-Sense and LO-Sense; cable shielding layer must be
grounded. Through using above connection, the influence from low thermoemf and
exterior interference could be reduced.
Testing Conditions
For best performance, please adhere to following advices throughout all testing
processes:
1. Keep the instruments operating in proper voltage all the time.
2. Make sure that the ambient temperature during testing between 18 °C and 18 °C.
It would be perfect if calibrate between 23°C and ± 2 °C.
3. Ensure the relative humidity less than 80%.
4. Warm-up the instrument at least one hour before testing or calibrating.
5. Use the copper connector to reduce the effection from thermoelectric potential.
6. Use Teflon Shielded Twisted Pair with isolation as short as possible in order to
reduce the effection form exterior disturb.
7. Grounding the shield of both twisted-pair and coaxial-cable, as well as the LO
terminal of calibration instrument if no special requirement.
Owing to DM3058 designed for high precision, so you must be more than careful while
testing or calibrating in order to avoid errors. In an optimal situation, the accuracy of
standard source for inspection and calibration must be five times at least than the
accuracy of testing instrument.
While perform the gain calibration for DC voltage, DC current and resistance, the
“0”output of calibration instrument must be correct. In order to reduce the connection
errors, enough warm up must be done before reconnecting cables or shortcircuiter
every time. Generally, the preheating time is about 5 mins.