2-22
INSTALLATION ORBAN Model 6200
For example, with an STL where 100% modulation = +18dBu, and with a
studio where 0VU = +4dBu:
+18−(+4)−14 = set gain of the 4000 to 0dB
For facilities using PPM meters, we suggest:
100% peak level (dBu)–PPM reference level (dBu)−9db = gain of the 4000
For example, with an STL where 100% modulation = +15dBu, and with a
studio where PPM reference level = +6dBu:
+15−(+6)−9 = set gain of the 4000 to 0dB
A)
Turn the
IN
(Input) control fully counterclockwise.
B) Press the
OPERATE
button, then the
TEST
button.
C) Apply a line-up tone to the 4000 input, at your organization’s standard reference
line-up level.
D) Calibrate the 4000 for the pre-determined gain or loss.
Measure the output level of the 4000 with an AC level meter. Adjust the
4000’s
IN
control to achieve the desired gain or loss.
E)
Press the
OPERATE
button. Observe the
LIMITING
meter.
If no gain reduction is indicated, the standard line-up level is below thresh-
old.
If gain reduction is indicated, the standard line-up level is above threshold
(less than 7dB below 100% modulation). System calibration will require that
the
TEST
button be pressed, either on the front panel or by remote control,
when system line-up calibration is performed. You may consider calibrating
the 4000 for less than unity gain by reducing the input control setting.
5. Calibrate the 4000’s Input level for normal operation using program
material.
[Skip this step if you wish to calibrate the 4000’s Input level using tone. (Refer
to step 4 on page 2-21.)]
A) Turn the
IN
(Input) control fully counterclockwise.
B) Press the
OPERATE
button, then the
TEST
button.
C) Play program material from your studio at normal levels.
D) Adjust the
IN
level controls so that the 4000 goes into gain reduction only on the
highest program peaks.
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