RTS MCS-325, Руководство пользователя

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4-4
M C E - 3 2 5 U s e r I n s t r u c t i o n s
2
Set the MIC ON button to on. Set all other front panel buttons to off.
3
Check for 13 VDC minimum at the key 1 output.
4
Turn CH 1 TALK on and check for less than 2 VDC at the key 1 output.
5
Repeat steps 3 and 4 for the other channels:
CH2 TALK: key 2 out (J22 pin 19)
CH3 TALK: key 3 out (J22 pin 7)
CH4 TALK: key 4 out (J22 pin 20)
6
Remove the 47 k ohm pull-up resistors when finished.
USMB (Un-Switched Microphone Balanced) Frequency Response
and Level Check
1
Set all front panel buttons to off.
2
Connect a signal generator to the DYN MIC HEADSET jack mic input (J2 pins 1 & 2).
3
Connect a 600 ohm resistor across the USMB output (J22, pins 1 and 14).
4
Connect an AC voltmeter across the 600 ohm resistor.
5
Verify the output levels for the input frequencies and levels in Table 4.2.
6
Remove the 600 ohm resistor across the USMB output.
Frequency Response and Level Check, Mic to Line
Four-Channel, Two-Wire Mode
1
Activate the MIC ON button. (All other front panel buttons should be off.)
2
Connect an AC voltmeter across the channel 1 output. The signal generator should still be
connected to the dynamic mic input.
3
Activate the CH 1 TALK button.
4
Verify the output levels for the input frequencies and levels in Table 4.3.
5
Repeat for channels 2 through 4 by connecting the AC voltmeter across the appropriate output,
activating the appropriate TALK button, and measuring the output level:
Table 4.1 Talk button vs. output.
TALK BUTTON OUTPUT
CH 2 J8, pins 1 and 3
CH 3 J10, pins 1 and 2
CH 4 J10, pins 1 and 3
Table 4.2
USMB frequency response and level check.
INPUT
FREQUENCY INPUT LEVEL
OUTPUT LEVEL
1 kHz -55 dBu (1.4 mV)
–45 dBu (4.35 mV)
–25 dBu (43.5 mV) -1 ±3 dBu (0.49 – 0.98 VAC)
2.5 ±2 dBu (0.83 – 1.32 VAC)
2 ±2 dBu (0.75 – 1.2 VAC)
100 Hz -55 dBu (1.4 mV)
–45 dBu (4.35 mV)
–25 dBu (43.5 mV) -0.5 ±3 dBu (0.51 – 1.03 VAC)
4.2 ±2 dBu (0.98 – 1.55 VAC)
4.2 ±2 dBu (0.98 – 1.55 VAC)