Installation Section 2
2-1
SECTION II
INSTALLATION
2-1. INTRODUCTION.
2-2. This section contains the unpacking, mounting,
power requirements, cable connections, and preliminary
check-out instructions for the Model 1121A Audio
Analyzer.
2-3. UNPACKING.
2-4. The instrument is shipped complete and is ready to
use upon receipt. Unpack the instrument from its ship-
ping container and inspect for damage that may have
occurred during shipment. Refer to Figure 2-1.
NOTE
Save the packing material and container for
possible use in reshipment of the instrument.
2-5. MOUNTING.
2-6. For bench mounting choose a clean, sturdy, un-
cluttered mounting surface. For rack mounting, an
accessory kit is available which provides mounting ears.
The rack mounting kit contains the required hardware and
instructions.
2-7. POWER REQUIREMENTS.
2-8. The instrument has a tapped power transformer and
two line voltage selection switches which permit
operation from 100, 120, 220, or 240 volt ± 10%, 50 to
400 Hz, single phase AC power sources.
Always make certain that the line voltage selection
switches are set to the correct positions corresponding to
the voltage of the AC power source, and that a fuse of the
correct rating is installed before connecting the
instrument to any AC power source.
2-9. Set the rear panel line voltage selector switches to
the appropriate positions as indicated in the Line Voltage
Select Chart and check that the line fuse is correct for the
selected power source.
2-10. CABLE CONNECTIONS.
2-11. Front panel connector:
INPUT. Analyzer Input HIGH and LOW BNC type
connectors and chassis ground allow connection of ex-
ternal audio signals for analysis. The input impedance is
100 k ohms either side to ground. The LOW terminal is
connected to chassis ground in the non-floating mode.
OUTPUT. Source output HIGH and LOW BNC type
connectors and chassis ground allow connection to ex-
ternal devices and components. The output impedance is
selected using special functions 75, 76, and 77. The LOW
terminal is connected to chassis grounding the
non-floating mode.
2-12. Rear panel connectors:
MONITOR. The MONITOR BNC type output con-
nector provides a scaled output of the input signal in the
level, frequency and signal-to-noise measurement modes
and a scaled output of the input signal with the
fundamental removed in the distortion and SINAD mea-
surement modes. The output impedance is 600 ohms.
X CLK. The X CLK BNC type input connector provides
a means of connecting to an external 10 MHz counter
reference. The external reference is automatically
selected when a TTL level signal is present.
SYNC. The SYNC BNC type output connector
provides a TTL compatible signal relative to the source
frequency setting.
X AXIS. The X AXIS BNC type output connector
provides a 0 to 5 volt d.c. level relative to the sweep
frequency or level in the sweep mode. The output im-
pedance is 1000 ohms.
Y AXIS. The Y AXIS BNC type output connector
provides a 0 to 5 volt d.c. level relative to the analyzer
measurement and entered HIGH and LOW plot limits.
The output impedance is 1000 ohms.
PEN. The PEN BNC type output connector provides a
TTL compatible signal to control the pen of an external
recorder.
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