4.0 DMM OPERATIONS AND MEASUREMENTS. Artison SMX2040, S-LCR-DM, SMX2042, SMX2044

4.0 DMM Operations and Measurements

Most of the SMX2040 measurement functions are accessible from the Windows Control Panel (Figure above). All of the functions are included in the Windows DLL driver library. To gain familiarity with the SMX2040 series

DMMs, run the Windows ‘SETUP.EXE’ to install the software, then run the DMM, as described in the previous section. This section describes in detail the DMM’s operation and measurement practices for best performance.

4.1 Voltage Measurement

Measures from 0.1

µV to 300 VDC or 250 VAC. Use the V, Ω + and V, Ω - terminals, being certain to always leave the I+, I- and DIN-7 terminals disconnected. Use the AC/DC button on the Control Panel to switch between AC and

DC.

Making Voltage Measurements is straightforward. The following tips will allow you to make the most accurate voltage measurements.

4.1.1 DC Voltage Measurements

When making very low level DCV measurements (<100

µV), you should first short the DMM with a copper wire shorting plug across the V,

Ω + and V, Ω - terminals and perform the Relative function to eliminate zero errors before making your measurements. A common source of error can come from your test leads, which can introduce several

µVolts of error due to thermal voltages. To minimize thermal voltaic effects after handling the test leads, you should wait a few seconds before making measurements. Signametrics offers several high quality probes that are optimal for low level measurements.

Note: The SMX2040 front panel powers up in DCV, 2 readings per second, 330 V range. If the DMM is operated in

Autorange, with an open input, you may hear the SMX2040 relays clicking every few seconds, as a range change occurs. This is perfectly normal with ultra high impedance DMMs such as the SMX2040. This phenomenon is caused by the virtually infinite input impedance of the 330 mV and 3.3 V DCV ranges. On these ranges, an open input will read whatever charge is associated with the signal conditioning of the DMM. As this electrical charge changes, the SMX2040 will change ranges, causing the relays to click. This is normal.

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