OM-USB-5201 User's Guide
Functional Details
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To reduce the error, reduce the length of the thermocouple to lower its resistance, or lower the AWG of the wire
by using a wire with a larger diameter. With open-thermocouple detection disabled, 30 nA (max.) of input
leakage current is injected into the thermocouple.
External components
The OM-USB-5201 has the following external components, as shown in Figure 5.
Screw terminals
USB connector
LED
CompactFlash slot with memory card
Figure 5. OM-USB-5201 component locations
Screw terminals
The device's four banks of screw terminals are for connecting temperature sensors and digital I/O lines. These
terminals also provide ground and power output connections. Refer to the "
" chapter for
screw terminal descriptions.
USB connector
When not logging data, connect the USB cable to a USB port on your computer or to an external USB hub that
is connected to your computer. When connected to an active USB bus, the device's USB connector provides
+5 V power and communication. The voltage supplied through the USB connector is system-dependent, and
may be less than 5 V. No external power supply is required.
Due to processing limitations, you cannot log data when the device is attached to an active USB bus. For data
logging operations, connect the device's USB connector to the external power supply.
LED
The LED uses up to 5 mA of current. The function of the LED varies according to whether the OM-USB-5201
is connected to an active USB port, or when the device is logging data and connected to the external power
supply.
The following table lists the LED function when the device is connected to an active USB port and not logging
data.
Summary of Contents for OM-USB-5201
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