Solidyne 2600 serie, Owner'S Manual

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Specs & Measurements
Chapter 5
5.1 General Measurements
The radio stations that have their own Engineering De-
partment sometimes needs to carry out measurements
when receiving the console. Also some engineers esti-
mate convenient to carry out every five years a general
inspection of the console to verify if the specifications
continues being perfect.
The following methods and comments refers to Techni-
cal Specifications that figure at the end of this chapter.
Before starts any measurement, make sure that all modules
present the following conditions: PAN POT at the center position.
PGM, AUD, and SEND buttons released; AIR and CUE must be
off. Be sure the console is properly grounded and no RF is
present at the measurement Laboratory.
5.1.1 Microphone
Connect an audio generator to a microphone input.
Connect an audio level meter and an oscilloscope to
the PGM left output (then repeat with the right). Con-
nect a 600 ohms charge to the output.
Set the audio generator to 1 kHz -80 dBm. Select MIC
and PGM on the channel which the generator is con-
nected. Enable the channel pressing the AIR button.
Move the main fader from this channel to the maxi-
mum. Increase the gain of the module until obtain
+4dBm at the output.
Move GAIN to the minimum. Change the generator to
-45 dBm. Move the fader until you verify that can ob-
tain +4 dBm without clipping at the output.
Change to the right input of this channel (or to another
module) and repeat the procedure.
5.1.2 Line
Connect the generator to left input of a line channel,
with a level of -20 dBm at 1 Khz. Verify that the oscil-
loscope and audio level meter are connected to the
left PGM output. Select LIN and PGM in the channel
under test. Enable the module by pressing the Air but-
ton; move to the maximum the GAIN preset and move
the main fader until you verify that can 4 dBm
at the output.
Change the gain control to the minimum; and increase
the input level up to +18 dBm; move the fader until ob-
tain +4 dBm at the output without visible clipping.
Increase the gain with the main fader until obtaining
+15 dBm at the output. Use this value like reference.
Connect the balanced input in common mode joining
both signal terminals. Then, verify that the output level
decrease at least 40 dB. Change the test frequency to
verify the common mode rejection specification.
Repeat for the right input of this channel or for another
module.
5.1.3 Aux Input
Connect the generator to the AUX left input. Select
AUX and repeat the procedure explained for the line
channels, with levels of -25 dBm and +4 dBm. Take in
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