Wheatstone TV-80, Technical Manual

Page: 99 / 120

A P P E N D I C E S
TV80 / Sep 98
Notes on Level Measurement
Audio levels today are commonly referred to as voltage equivalents
of power levels in 600 ohm circuits. One milliwatt (0 dBm) in 600 ohms
is a voltage of .775 V. The corresponding unit for use in circuits where
the exact impedance is unknown or irrelevant is the dBu (the "u" stands
for "unloaded"). Thus, 0 dBu is .775 V regardless of the impedance of
the circuit where it is measured. (Note the dBu should not be confused
with the dBV; 0 dBV = 1 volt.)
Typical unbalanced input and output connections to the TV-80 console.
2142
H
L
SH
BALANCED
OUTPUT
2142
H
L
SH
UNBALANCED
OUTPUT
+
–
CONSOLE OUTPUT
CONSOLE OUTPUT
TV-1000 CONSOLE OUTPUTS
RED
BLK
SHIELD
RED
BLK
SHIELD
BALANCED INPUT
UNBALANCED INPUT
Balanced
Source
Output
Unbalanced
Source
Output
CONSOLE INPUT
CONSOLE INPUT
TV-1000 CONSOLE INPUTS
Tie low (black) and shield
together at source end
page A – 4
TV-80 CONSOLE INPUTS
TV-80 CONSOLE OUTPUTS