928 Mixing Console
Edition:
07.02.01 Alignment, general E 3/15
3.2.7 Measuring set-up
Inserting/removing modules: The modules to be aligned must be removed from the console and
connected to the bus via bus adapters.
The 0 Ω bus amplifiers are sensitive to voltage peaks occurring during
hot patching.
For protection of the console and its periphery, the modules may be
inserted or removed only after switching the console off.
Balanced test equipment: As a matter of principle, the AF voltmeter must have a balanced input,
the AF generator must have a balanced output.
A
B
T
12
3
1 kHz
AF Generator Input (female)
3
A
B
T
1 2
AF Voltmeter
(balanced)
Output (male)
Connection of the AF generator with a balanced line. Measurements with the AF voltmeter are per-
formed without load (Ri ≥ 10 kΩ)
Unbalanced test equipment: If the input of the AF voltmeter is unbalanced, it has to be connected
via a balancing transformer. Should this not be feasible, the following
method can be used as a makeshift:
3
A
B
1 2
IN
AF Voltmeter
(unbalanced)
Output (male)
The „cold“ B-line (pin 3) is connected to the audio ground (pin 1) and
constitutes an unbalanced ground point.
This set-up cannot be used for high-level measurements (in electroni-
cally balanced outputs clipping can occur).
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