dk 477-200A Посібник користувача - Сторінка 6
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Друкувати сторінкуRemote Control input 4 (RC#4)
This input is designed to substitute all the functions also accessible as push buttons on the front of the instrument. The
remote switches must have momentary action and a series resistor according to table 3 must be used.
The switches "common side" must all be connected to GND (Pin 3).
Table 3
Function
Additional Gain
Integration time. Fast/Normal
Mode
Zoom
Display max.
Clear max.
Technical specifications.
Supply voltage......................................................................20-32 V dc or 18V ac
Current consumption, @ 24V supply ...................................160 mA typ. (Max. 220 mA)
Signal input:
Input type .............................................................................Serial digital audio interface (IEC 958/AES3)
Input impedance ...................................................................High impedance, floating, (Zi > 1 kΩ) or 110 ohms
Minimum input signal ..........................................................Vmin = 200 mV, Tmin = 0.5 x Tnom (IEC 958)
Sampling rates......................................................................48 kHz, 44.1 kHz and 96 kHz
Measuring characteristics:
Main reading (bar graph):
Integration time ....................................................................5/10 ms (IEC 268-10, 1991-03)
Return time...........................................................................1.7 s ± 0,3 s (0 to - 20 dB) (IEC 268-10, 1991-03)
Reference level ....................................................................selectable 0 to 31 dB below max. digital code.
Overload indication .............................................................the bar intensity is increased within overload range.
Low frequency cut-off .........................................................DC-blocking; Cut-off frequency <0.3 Hz
Secondary reading (spot):
Integration time ...................................................................."zero"
Return time...........................................................................1.7 s ± 0,3 s (0 to - 20 dB) (IEC 268-10, 1991-03).
Scale max. ...........................................................................Scale max. equals the lower limit of intensified bar range.
Reference level ....................................................................Scale max. corresponds to max. digital code level.
Phase indication:(option) ....................................................0 to 180°. - Resolution: 18°.
Additional functions:
Gain:
Additional 20 dB gain selectable on front.
Mode
The Bar-Graph display can be operated in various modes. Pls. refer to the "Operating instructions"
Memory:
A peak memory is provided. Reset is controlled from a push-button on the front.
Zoom:
To enable extremely accurate reading around "0 dB", the scale may be expanded by a factor of 10.
LED Indicators:
Flashing LEDs on top of each bar for instantaneous digital overload.
Excessive DC-content in either channel.
Gain, when selected.
Sampling rate and preemphasis, if present.
Remote overload indication.
Output for remote overload indication is accessible through the 9-pole D-sub connector. The output is an open collector
in series with an internal 2.2 k Ω resistor. The output is common to both channels.
20030929
Resistor
value (ohms)
0
645
1379
2222
3200
4348
Document no. 477-2010A page 6 of 6