Operator`s manual

1.0 Introduction
Congratulations! You have purchased a USB Digital Multimeter. The SMU2055 Digital Multimeter (DMM) has
sophisticated analog and digital circuitry to provide repeatable measurements, and its protected to handle any
unexpected situations your measurement environment may encounter. Your new DMM is easy to setup and use. To
get years of reliable service from your DMM, please take a few moments to review this manual before installing and
using this precision instrument.
This manual describes the SMU2055 USB module.
1.1 Safety Considerations
Safety Considerations
The SMU2055 DMM is capable of measuring up to 240 VDC or 240 VAC across the Volt HI and LO
terminals, and can also measure common mode signals that "float" the DMM above EARTH ground by up
to 300 VDC or 250 VAC. When making common mode measurements, the majority of the circuits inside
the DMM are set to the common mode voltage. These voltages can be lethal and may KILL!
The DMM comes installed in a plastic chassis with 4 components (bottom, top, front and back) that must
not be removed due to performance as well as safety reasons. Removal of these shields and/or
improper assembly of the shields can expose lethal voltages. The plastic screws are required for safety
reasons.
Warning
Check to see that all measurement wires are separated from the USB communication cable. If
measurement wires come into contact with the USB cable, this may apply measurement voltages to
your computer, causing personal injury and/or damage to your computer!
When making any measurements above 50 VDC or 40 VAC, use only approved Safety Test Leads
such as Signametrics Basic Test Leads or Deluxe Test Leads, offered as optional accessories with the
Signametrics DMM’s.
1.2 Minimum Requirements
The SMU2055 DMMs are precision modules that are compatible with any USB 2.0 or higher computer port. A
mouse must be installed when controlling the DMM from the Windows Control Panel. The SMU2055 comes with
a Windows' DLL, for operation with Windows Version 95/98/Me/2000/XP, Vista and LINUX.
1.3 Feature Set
The SMU2055 is a traditional 6-1/2 digit DMM and can be used as a general purpose DMM. Signametrics also
offers the high precision 7-1/2 digit USB DMM, the SMU2060, which adds capacitance measurements, triggered
operation and a high resolution frequency counter. If your requirements call for a High Workload, then the Multi
Function SMU2064 will probably fit the ticket with its timing measurements, inductance, sourcing and higher
speed. The SMU2064 specialized measurements can replace costly instruments and thus shrinking the size and cost
of a test system.
Signametrics 6