Instructions

UM-0085-B09 DT80 Range User Manual Page 408
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 ground loops
More often that not, grounds in a measurement system are not at the same electrical potential — differences may be
from microvolt to many volts. Then, if signal wires happen to connect different grounds together, currents can flow
and result in unpredictable measurement errors. These unintended conduction paths are referred to as ground
loops. The DT80 has been designed for maximum immunity to ground loops — see Ground Loops (P372).
 host computer
The computer you use for supervising the DT80
 host software
The software you run on the host computer to supervise the DT80. See DT80-Friendly Software (P18).
 HWFC
Hardware flow control (RTS/CTS). Also known as hardware handshaking. See Hardware Flow Control (P194).
A device using hardware flow control monitors its Clear To Send (CTS) input and will not send data until the signal is
active. Conversely, a device indicates that it can receive data by driving its RTS output active (which is then
connected to the other device's CTS input)
 Hz
Hertz, a unit of frequency
 instrumentation amplifier
A precision differential amplifier for amplifying the DT80’s analog input signals (wanted) and rejecting any common-
mode voltage (unwanted).
 IP address
A device’s address on a TCP/IP Ethernet or wireless network. Every device connected to an TCP/IP network must
be assigned its own unique IP Number. An IP address is written as four decimal numbers e.g. 192.168.1.209
A private IP address has the form 10.x.x.x or 192.168.x.x or 172.16.x.x through 172.31.x.x, or 169.254.x.x and is
only visible on the local network. A public IP address is visible from anywhere on the Internet.
 ISO
International Organization for Standardisation
 job
A logical "hold-all" for a group of schedules and other commands, and related data and alarms. Each job has a
name and a directory structure that organizes this information. See Jobs (P61).
 kB
Kilobyte, 1024 bytes
 kbps
Kilobits per second, 1024 bps
 Kelvin sense point
A particular point in a measurement circuit where a measurement should be made to ensure the best possible
accuracy by ensuring that unwanted voltage drops due to current flows are minimized. Symbol
 LED indicator
Light-emitting diode indicator. The DT80 has three LEDs on the front panel, which light to indicate Sampling, Internal
Disk Activity, Attention Required and Power Status.
 logging
Recording or storing data. The DT80 logs data to its internal memory and/or an external USB memory device.
Logging is a separate, user-configurable operation that the DT80 performs in addition to its basic function of data
acquisition (taking measurements from sensors connected to its inputs). See also data logging system (P405) and
data acquisition system (P405).

lsb
least significant bit (within a byte)
 LSB
Least Significant Byte (within a multi-byte word)
 mΩ
Milliohm, 10
-3
Ω