Studer 928 - Required test equipment and tools; Measurement basics

Edition:
07.02.01E 3/14 Alignment, general
928 Mixing Console
3.2.5 Required test equipment and tools
• Audio frequency generator with balanced output,
output impedance ≤ 200 Ω (e.g. included in AudioPrecision “Portable
One”)
or (if no balanced output is available): additional balancing trans-
former – also refer to 2.11.7
• Audio frequency voltmeter with balanced input,
input impedance ≥ 10 kΩ (e.g. included in AudioPrecision “Portable
One”)
or (if no balanced input is available): additional balancing transformer
– also refer to 2.11.7
• DC voltmeter, R
i
≥ 20 kΩ/V
• Distortion analyzer (e.g. included in AudioPrecision “Portable One”)
• Two-channel oscilloscope (not mandatory; if available only)
• Alignment screwdriver, size 1
• Bus adapters for connecting detached modules to the bus; minimum
requirement:
2 Bus adapters, 2 × 32-pin Order No. 1.228.332.00
• 2 Module extractors Order No. 1.912.000.06 (1 pce.)
Note: The module extractors are contained in the accessories set, order no.
1.928.096.00 (refer to section 1.2.4).
• „ESE“ protection set (mat 60 × 70 cm, grounding wrist strap, and
grounding cable) Order No. 20.020.001.44
• Solid insulating mat (e.g. rubber or cardboard), approx. 25 × 40 cm,
as a rest for detached modules which are connected to the bus and
are placed onto the operating surface of the console.
3.2.6 Measurement basics
Temperature: Aligning the console should only be performed when it has reached
operating temperature (approx. 15 min after powering on).
Load: All outputs and insert points are to be measured without load – i.e. the
input impedance of the AF voltmeter must be 10 kΩ at least.
Test signal: Sine wave, approx. 1 kHz.
Level reference: All indications in the following instructions are referred to a nominal
level of +6 dBu.
Other nominal levels require changed indications according to the
table below:
Level overview:
Nominal level Line outputs
(6 dB lead)
0 VU indication
@
(PPM)
0 dB indication
@
+6 dBu
+10 dBu
+15 dBu
+6 dBu
+10 dBu
+15 dBu
+0 dBu
+4 dBu
+9 dBu
+6 dBu
+10 dBu
+15 dBu
Insert levels: The level of the balanced insert points is equal to the nominal level.