USB DrDAQ User's Guide
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Copyright © 2013 Pico Technology Ltd. All rights reserved.
usbdrdaq.en r4
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Introduction
1.1
Contact information
Address:
Pico Technology
James House
Colmworth Business Park
ST NEOTS
Cambridgeshire
PE19 8YP
United Kingdom
Tel: +44 1480 396395
Fax: +44 1480 396296
Web site:
1.2
Safety warnings
Warning triangle
This symbol indicates that a safety hazard exists on the indicated
connections if correct precautions are not taken. Read all safety
documentation associated with the product before using it.
Safety warnings
USB DrDAQ ground is connected directly to the ground of your computer. As with
most oscilloscopes and data loggers, this is done in order to minimize interference.
You should take care not to connect the ground (screw terminal, outer shell of BNC or
exposed metalwork) of USB DrDAQ to anything which may be at some voltage other
than ground, as doing so may cause damage to the unit. If in doubt, use a meter to
check that there is no significant AC or DC voltage.
For computers that do not have an earth connection (for example, laptops), it must be
assumed that USB DrDAQ is not protected by an earth (in the same way a battery
multimeter is not protected by an earth).
The scope channel on the USB DrDAQ has a maximum input voltage range of ±10 V.
The maximum input voltage for all other inputs is 0 to 5 V. Any voltage in excess of
±30 V may cause permanent damage to the unit.
Your own sensors should draw no more than 100 mA from the 5 V. The USB DrDAQ is
not limited or protected so overcurrents or short circuits could cause damage to the PC
USB port.
The unit has no user serviceable parts: repair or calibration of the unit requires
specialized test equipment and must be performed by Pico Technology Limited or their
authorized distributors.
