User manual

dCS 950 / 952 User Manual Manual for Software Version 6.2x
dCS Ltd 22
nd
May 2000
Manual part no: DOC0029526B1 Page 53 Document No: OS-MA-D0002-952.6B1
Contact dCS on + 44 1799 531 999 email to: [e-mail]
(inside the UK replace + 44 with 0) web site: www.dcsltd.co.uk
INDEXES AND SOFTWARE VERSION NUMBERS
This manual is for software versions 6.10 and 6.2x.
v6.2x is functionally identical to v6.10, it has been harmonised with dCS 954.
v6.2x versions differ only in a few minor bug fixes.
Definitions of Units
dB A relative level in decibels. The context should
state the reference level.
dB0 Level in decibels, referred to a full scale sine wave
in a sampled system. So, 0 dB0 is full scale.
dBu Level in decibels, referred to a 0.775V rms sine
wave, with no external loading (u = unloaded).
The level of 0.775V is derived from the older dBm,
for which the reference level is 1mW of signal
power into a 600Ω termination from an output with
600Ω source impedance.
dBV Level in decibels, referred to a 1.0V rms sine wave,
with no external loading.
kS/s Sample rate in kilo-samples per second. This
replaces kHz which is technically incorrect when
referring to sample rates.
ADC Analogue to Digital Converter. Sometimes referred
to as an A/D Converter.
DAC Digital to Analogue Converter. Sometimes referred
to as a D/A Converter.
DDC Digital to Digital Converter. Sometimes referred to
as a D/D Converter.