Programmable Attenuators
Model 8312
High Power Programmable Attenuator
100 Watt Hot Switching Capability
Features
o
Available in 0-15 dB or 0-31 dB Configurations.
o
Provides a flexible, easy to program, low cost solution
for your bench test/calibration setups and subsystem
applications.
o
Relative vs. Nominal attenuation step function.
o
DC to 13.0 GHz Operation.
o
High Accuracy & Repeatability.
o
Power Handling up to 100 Watts average
o
Designed to interface with industry standard
communication interfaces:
- GPIB/IEEE-488 (HS-488 ready)
- RS-232, RS-422
o
Built-in monitoring for switching input power into the
load in case of fan failure.
o
Rack Configurable:
A Rack Mounting Kit is included
for easily mounting the Model 8312 into any rack or
cabinet that is designed per EIA RS-310 or
MIL-STD-189.
IEEE-488
RS232\RS422
Description
Aeroflex / Weinschel's design approach uses a highly
adaptable platform that allows configuration of the step
attenuator to the customers requirements. When the con-
troller requests a new attenuation level the input switch
terminates the input signal into a 50 Ohm load. (See Figure
1) This input switch is
hot switchable at 100 Watts
of input
power. This will remove the high power signal from the main
signal path. With no signal connected to the attenuator path
the controller then commands the series of relays to config-
ure the attenuator for the requested attenuation value. Then
the input switch re-connects the input signal to the attenua-
tor path. The system can be operated with either a remote
controller (IEEE-488 or RS-232) or through front panel
control.
HIGH POWER
HOT SWITCH
RFOUT
RF IN
50
Ω
, 100 W
TERMINATION
1 dB
100 W
2 dB
100 W
4 dB
100 W
8 dB
100 W
16 dB
100 W
OPTIONAL
Device
Interface
Bus
SMARTSTEP
CONTROLLER
POWER
SUPPLY
Note: If power failure should occur, the unit will remain in the last selected attenuation state.
Figure 1. Model 8312 Block Diagram
For additional information on the Model 8312, visit our website @ www.aeroflex-weinschel.com/8312.htm
129
5305 Spectrum Drive, Frederick, MD 21703-7362 TEL: 301-846-9222, 800-638-2048 Fax: 301-846-9116
web: www.aeroflex-weinschel.com email: weinschel-sales@aeroflex.com
Revision Date: 7/8/08
Programmable Attenuators
Specifications
SPECIFICATION
Input Power Requirements
Environmental
AC
DESCRIPTION
100 to 240 Vac, 50/60 Hz, 50 Watts
0 to +50°C
67° to +167 °F (-55° to +75°C)
96%
40,000' (12,192M)
Operating Temperature
Storage Temperature:
Humidity:
Altitude:
Connector:
Protocols:
Indicators:
Connector:
Signals:
Baud Rates:
Data Bits:
Handshaking:
Parity:
Indicators:
Connector:
Signals:
Baud Rates:
Data Bits:
Handshaking:
Parity:
Indicators:
IEEE-488 Bus
24-pin per IEEE-488.1
per IEEE-488.2
Remote (RMT), Listen (LSN), Talk (TLK), SRQ (SRQ)
9-pin male D
TXD, RXD, RTS, CTS, DTR, GND
2400, 9600, 19200, and 38400
8
None, RTS/CTS, XON/XOFF
None, Odd, Even
Tx (Transmit) and Rx (Receive)
9-pin male D
TXD+, TDX-, RXD+, RTX-, RTS+, RTS-, CTS+, CTS- and signal GND
2400, 9600, 19200, and 38400
8
None, RTS/CTS, XON/XOFF
None, Odd, Even
Tx (Transmit) and Rx (Receive)
Type N, Female
dc - 13 GHz
50
Ω
50 MHz - 5 GHz:
5 GHz - 13 GHz:
1.60 (Maximum)
2.30 (Maximun)
RS-232 Bus
RS-422 BUS
(3)
RF Characteristics
(4)
Connectors:
Frequency Range:
Impedance:
SWR:
Attenuation Range:
RF Power Rating:
Attenuation Settings:
Attenuation Update Rate:
Incremental Accuracy:
15 dB/1 dB steps (8312-15-F)
31 dB/1 dB steps (8312-31-F)
50 MHz - 5 GHz:
5 GHz - 13 GHz:
100 Watts (Maximum)
50 Watts (Maximum)
100, 000 selections (minimum)
1 second (Typical)
Frequency
50 MHz - 3 GHz:
3 GHz - 5 GHz:
5 GHz - 13 GHz:
1-15 dB
+0.6 dB
+0.6 dB
+2.5 dB
8312-15-X
3.0
4.0
7.0
16-31 dB
+0.8 dB
+0.8 dB
+3.0 dB
8312-31-X
3.5
4.5
8.0
Insertion Loss (dB):
Frequency Range
50 MHz - 3 GHz:
3 GHz - 5 GHz:
5 GHz - 13 GHz:
1. GPIB/IEEE-488 model allows user-selectable addresses.
2. RS-232 can be used with standard PC serial port for short and medium distances (up to approximately 50 ft).
3. RS-422, designed for very long distance communications (4000 ft) and & optimized as a single node protocol, typically with one device connected to a
single port.
4. Refer to Individual data sheet for detailed specifications on internal programmables.
130
5305 Spectrum Drive, Frederick, MD 21703-7362 TEL: 301-846-9222, 800-638-2048 Fax: 301-846-9116
web: www.aeroflex-weinschel.com email: weinschel-sales@aeroflex.com
Revision Date: 7/8/08
Programmable Attenuators
Physical Dimensions
NOTE:
All dimensions are given in mm (inches) and are maximum, unless otherwise specified.
MODEL NUMBER DESCRIPTION:
Example:
8312 - XX - X
Basic
Model
Number
Attenuation Connector Location
F = Front
Value (dB)*
R = Rear
* Available in 0-15 dB and 0-31 dB configurations only!
131
5305 Spectrum Drive, Frederick, MD 21703-7362 TEL: 301-846-9222, 800-638-2048 Fax: 301-846-9116
web: www.aeroflex-weinschel.com email: weinschel-sales@aeroflex.com
Revision Date: 7/8/08
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