Operator`s manual

The Control Panel is operated with a m
ouse. All functions are accessed using the left mouse button.
When the DMM is operated at very slow reading rates, you may have to hold down the left mouse button
longer than usual for the program to acknowledge the mouse click.
Note: The SMU2055 front panelstarts up in DCV, and 240 V range. If the DMM is operated in
Autorange, with an open input, it will switch between the 2.4V and 24V ranges every few seconds, as a
range change occurs. This is perfectly normal wth high end DMM’s such as the SMU2060. This
phenomenon is caused by the virtually infinite input impedance of the 2.4V DC range. 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 SMU2060 will change ranges, causing the range switching. This is
normal.
3.8 Using the Control Panel
Figure 3-6. The Control Panel for the SMU2064. The three main groups include Measure, Source and
Range buttons. The Range buttons are context sensitive such that only “240m, 2.4, 24, 240 and 330
appear when in AC Voltage Function is selected, and 2.4m, 24m, 240m and 2.4 appear when AC Current
functions is selected, etc.
Note: All of the controls described below correspond to their respective software function, which can be
invoked within your control software or as objects in a visual programming environment. The software
command language of the SMU2060 provides a powerful set of capabilities. Some of the functions are not
included in the control panel, but are in the software.
DC/AC This function switches between DC and AC. This is applicable for the following DMM
functions: Voltage, Current, and Voltage-Source. If Voltage-Source is the function presently in use, the
Source control under the Tools menu can be used to set frequency and amplitude in ACV, and amplitude
only in DCV and DCI.
Relative This is the Relative function. When activated, the last reading is stored and subtracted from all
subsequent readings. This is a very important function when making low-level DCV measurements, or in
2W. For example, when using 2W, you can null out lead resistance by shorting the leads together and
clicking on Relative. When making low level DC voltage measurements (e.g., in the V region), first
apply a copper short to the V, + & - input terminals, allow the reading to stabilize for a few seconds,
and click on Relative. This will correct for any offsets internal to the SMU2060. The Relative button
can also be used in the Percent and dB deviation displays (shown below), which are activated using the
T
ools in the top menu.
31 Signametrics