UM-0085-B09
DT80 Range User Manual
Page 404
RG
Auto-ranging
The process of changing amplifier gain automatically so that the signal is amplified as much as is possible without
exceeding output limits.
base date and time
The DT80’s base date is 0:00:00 on 01/01/1989. All timestamps are stored as offsets from this point in time.
bit
The smallest unit of information in a computer. A bit has a single value: either 0 or 1. Computers generally store
information and execute instructions in bit-multiples called bytes.
bps
bits per second, a measure of data transfer rate
bridge
A sensitive and stable means of measuring small changes in resistances. They are particularly useful when applied
to strain gauges (as found in pressure sensors and load cells). See
.
buffer
An area of memory where data is held temporarily until the system is ready for it, or in case it is needed in the future.
Byte
A unit of information that is eight bits long
CAN
Controller Access Network. A standard network protocol widely used in the automotive industry. The dataTaker
CANgate product allows a DT80 to log data from a CAN network.
carlson meter
A sensor for measuring strain, which works by detecting the change in resistance of a pair of steel wires.
carriage return (CR)
An ASCII character (code 13 decimal) often used to mark the end of a line of text or a data record.
channel
Describes a measurement to take, or a control action to perform.
channel definition
A channel’s ID followed by any channel options (in round brackets). See
.
channel ID
A channel’s number and type (e.g.
3TK
). See
.
channel list
A list of channel definitions within one report schedule.
channel table
An internal DT80 data structure that stores details of all defined channels. The channel table is limited to a maximum
of 1000 entries.
A channel table entry is used each time a channel is referenced in the current job. For example, the job
RA10S T 4V 1CV(W)=1CV+1 ALARM2(1CV>10)"boo"{1DSO=0}
uses 5 channel table entries (for
T
,
4V
,
1CV
,
1CV
and
1DSO
).
clock
The DT80 a real-time clock/calendar, which you can set to your actual time
CMRR
Common-Mode Rejection Ratio. A measure of the influence of common-mode voltage (unwanted) on the output of
the DT80’s instrumentation amplifier (see
below).
More precisely, CMRR is the ratio of the common-mode voltage at the amplifier’s input to the common-mode voltage
at the amplifier’s output, expressed in dB. It indicates the quality of a measuring system’s input electronics. Relevant
to basic (differential) inputs only.
where
•
VCM is an applied common mode voltage
•
Vout is the resulting output voltage
•
AV is the amplifier's voltage gain
