14 Glossary
Table 14.1: Glossary of terms
ADC
A
nalog to
D
igital
C
onverter. A device usde to convert an analog signal into a digital value.
CCD
C
harge
c
oupled
d
evice is a type if image sensor.
EEPROM
E
lectrically
E
rasable
P
rogrammable
R
ead
O
nly
M
emory is a type of memory that retains its
contents after the power has been removed. This type of memory has a limited write/erase cycle
as well as a lifetime for data retention. In the SQM-LU, the parameters in the micro-controller
can be written 1 million times and last for 100 years.
Firmware
The program that resides inside the device. In the case of the Unihedron SQM products, it is
the software runs the device including reading and reporting the light values.
F
lexible
I
mage
T
ransport
S
ystem is an open standard defining a digital file format useful for
storage, transmission and processing of scientific and other images.
F
uture
T
echnology
D
evices
I
nternational is the manufacturer of the USB module inside the
SQM-LU. FTDI also supplies the VCP software driver for the computer operating system so
that the SQM-LU can communicate with the computer.
GPS
G
lobal
P
ositioning
S
ystem. A GPS receiver may be connected to a computer to allow UDM to
integrate the location information into the logged data. See UDM for mode details.
mpsas
M
agnitudes
p
er
s
quare
a
rcsecond. The unit of measurement reported by the SQM.
NMEA
N
ational
M
arine
E
lectronics
A
ssociation data format that the GPS receiver produces.
RAM
R
andom
A
ccess
M
emory. Temporary memory that only retains data while power is applied.
SQM-LU
S
ky
Q
uality
M
eter with
L
ens and
U
SB connectivity,
UDM
U
nihedron
D
evice
M
anager is software used to access the SQM series of meters.
USB
U
niversal
S
erial
B
us
V
irtual
C
OM
p
ort (VCP) drivers cause the USB device to appear as an additional COM port
available to the PC. Application software can access the USB device in the same way as it would
access a standard COM port. The SQM-LU requires the FTDI VCP driver be installed on the
computer operating system so that communications can be done with the meter.
66
Содержание SQM-LU
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