Revox C270 User Manual

Technical appendix Calibration (standard level)
Level definitions
Voltage level
OdBm (=0.775V)
OdBu (=0.775 V)
Line level
Voltage reference level
Standard reference level
(operating level)
Your tape recorder has been factory-aligned
exactly to specifications. In the following pa-
ragraphs you will not find any detailed instruc-
tions for calibration or recalibration of your
machine but only a definition of the common-
ly used levels and measuring variables.
Detailed calibration instructions can be found
in the service instructions for the C270 tape
recorder (order No.: 10.30.0920).
This level has been derived from the 1mW
power level in any load resistance. The vol-
tage drop across a 600 ohm load is 0.775V.
This voltage is defined as 0 dBm (regardless
of the load).
This level corresponds to a voltage of 0.775V
regardless of the load resistance. [dBu] is oc-
ase used in place of the voltage level
m].
The line level refers to the level that is
@ available at the output of a tape recorder
when a tape with reference fluxivity is being
played, or
@ fed into the input of a tape recorder when a
recording produces reference fluxivity.
CCIR designation for line level; this level pro-
duces a reading of 0 dB on a quasi peak pro-
gram meter (PPM).
A term commonly used in the USA for a tape
flux of 250 nWb/m (for recording on high-out-
put tapes) or 200nWb/m (for recording on
standard tapes); this level produces a VU-
meter reading of OVU.
33

Revox C270 Specifications

General

Brand	Revox
Model	C270
Category	Cassette Player
Language	English