Model 46A User Guide
Issue 1, September 2014
Studio Technologies, Inc.
Page 15
has current flowing through it for a mini-
mum of 30 milliseconds. A special case
arises when the auto null button operating
mode has been set to independent. This
requires one front-panel button tap to auto
null channel 1 and two button taps to auto
null channel 2. The remote control equiva-
lent for one tap is current flowing for a mini-
mum of 30 milliseconds. The equivalent for
two taps is current that flows for 30 millisec-
onds, then a minimum no-current period of
30 milliseconds, followed by current flow for
a minimum of 30 milliseconds. The second
period of current flow must come within one
second of the start of the first.
Once the interconnect method and the
source of the control signals have been
selected, refer to Figure 4 for connection
details. Ensure that the connected signals
follow the specified polarity or damage to
the opto-coupled inputs may occur.
It’s important that a competent technician
be available to perform the actual remote
control input connection process. As ex-
pected, mating the interconnecting cable
assembly with the Model 46A’s 10-pin
“header” requires removing the unit’s cover.
As such, this must be done only after con-
firming that all sources of mains power have
been disconnected from the unit.
AC Mains Power
The Model 46A operates directly from AC
mains power of 100 to 240 V, 50/60 Hz. As
a “universal mains input” device, there are
no switches to set or jumpers to install. A
3-pin IEC 320 C14 inlet connector on the
Model 46A mates with a detachable mains
cord set. For units shipped to North Amer-
ica and Japan a cord is supplied that has
a North-American (NEMA 15L) standard
plug on one end and an IEC 320 C13 con-
nector on the other. Units bound for other
destinations require that the appropriate
cord set be obtained. The wire colors in
the mains cord should conform to the
internationally recognized color code and
should be terminated according to the fol-
lowing chart:
Connection
Wire Color
Neutral (N)
Light Blue
Line (L)
Brown
Earth/Ground (E) Green/Yellow
Safety Warning:
The Model 46A does
not contain an AC mains disconnect
switch. As such, the AC mains cord
plug serves as the disconnection de-
vice. Safety considerations require that
the plug and associated inlet be easily
accessible to allow rapid disconnec-
tion of AC mains power should it prove
necessary.
As soon as AC mains power is applied
the Model 46A will begin its power-up
sequence. As a “boot up” indication the
power LED and each of the status LEDs
will momentarily light. After the sequence
has completed the power LED will again
light and remain lit. The unit is now fully
functional.
10-Pin
9-Pin D-Sub
Function
Header (P9) Interface Cable
Remote Auto Null Interface 1 +
7
4
Remote Auto Null Interface 1 –
9
5
Remote Auto Null Interface 2 +
2
6
Remote Auto Null Interface 1 –
4
7
Remote “Mic Kill” +
6
8
Remote “Mic Kill” –
8
9
Figure 4. Remote control input pin-out chart
