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Agilent 34945A, L4445A, and L4490A/L4491A
Configuration Guide
Contents
Introduction
Step 1 Supported Agilent Switches and Attenuators
Step 2 Distribution Boards, Bracket Kits, and Cable Kits
Bracket and Cable Kit Usage
RF Cable and Connector Suppliers
Step 3 Switch/Attenuator Driver Instruments and Platforms
The 34945A and L4445A Microwave Switch/Attenuator Drivers
The L4490A/L4491A RF Switch Platforms
System Interconnections Defined
L4490A and L4491A RF Switch Platform Product Options
L4490A/L4491A Bracket Layout Guidelines
Internal/External Power Supply Considerations
Internal Supply
External Supply
System Configuration Chart
Related Agilent Literature
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2
2
Introduction
RF/Microwave switches are used in a wide variety of applications ranging from
DC to over 50 GHz. These applications can include:
• Wireless Communications,
• Broadband CATV,
• Communication Satellites,
• Test and Measurement
Equipment,
• Electronic Radar and Defense Systems,
• Avionics,
• Medical Electronics,
• Space Programs.
High Frequency measurement systems can be configured to route RF/Microwave signals in a variety of configurations including:
• Selection from multiple signal sources to a single output,
• Selection of multiple input signals to a single measurement instrument,
• Transfer switching to insert or remove a device in a signal path,
• Matrix switching of multiple inputs and outputs.
Agilent Technologies is a leader in providing RF/Microwave switching solutions. Agilent’s solutions include both RF/
Microwave switch modules and switch driver instruments that control discreet
(external) switches and attenuators physically located at the site of the device under test (DUT) or application.
The purpose of this configuration guide is to introduce you to the features of the
Agilent 34945A, L4445A, and L4490A/
L4491A family of RF/Microwave switching instruments, and to assist you in the three step process of selecting and configuring your Agilent system:
Step 1: Select the switches/ attenuators and their options for your application.
Step 2: Determine the type and number of distribution boards required, and the bracket and cable kits required.
Step 3: Select the switch driver instrument or switch platform you plan to use.
Step 1
Supported Agilent Switches and Attenuators
The Agilent 34945A and L4445A
Microwave Switch/Attenuator Drivers and the L4490A/L4491A RF Switch Platform support virtually any RF/Microwave switch or attenuator.
Table 1, shown on the following page, is a list of commonly used and supported
Agilent switches and attenuators with their recommended options. Use Table 1 to locate your switch(es)/attenuator(s) and the accessories required. You may find it necessary to refer to the table frequently as you work through this guide.
Note that the switches, attenuators, and accessories shown in Tables 1 and 2 are not included with the instrumentation and must be ordered separately!
Use the chart on page 13 to track your selections as you determine your configuration.
Table 1. Common Agilent RF/Microwave Switches and Attenuators
Switch model
Description Frequency range
Reference document number 1
Coil voltage option
8762A
8762B
8762C
8763A
8763B
8763C
8764A
8764B
8764C
8762F
N1810UL
N1810TL
N1811TL
N1812UL
87104A
87104B
87104C
87106A
87106B
87106C
87106P
87106Q
87106R
87406B
87406Q
Un-terminated latching 3-port (SPDT)
Terminated latching 3-port (SPDT)
Terminated latching 4-port (bypass)
Un-terminated latching 5-port
SP4T 4-port latching, terminated
SP4T 4-port latching, terminated
SP4T 4-port latching, terminated
SP6T 6-port latching, terminated
SP6T 6-port latching, terminated
SP6T 6-port latching, terminated
Low PIM Switch, SP6T 6-port, latching, terminated
Low PIM Switch, SP6T 6-port, latching, terminated
Low PIM Switch, SP6T 6-port, latching, terminated
DC – 2, 4, 20, or 26.5 GHz
DC – 4 GHz
DC – 20 GHz
DC – 26.5 GHz
DC – 4 GHz
DC – 20 GHz
DC – 26.5 GHz
DC - 4 GHz
DC - 20 GHz
DC - 26.5 GHz
DC – 20 GHz
DC – 20 GHz
5968-9653E
5091-3366E
87104-80017
87204A
87204B
87204C
87206A
87206B
87206C
87606B
87606Q
87222C
87222D
87222E
87222R
6-port matrix, terminated
Low PIM Switch, 6-port matrix, terminated
SP4T 4-port latching, terminated
SP4T 4-port latching, terminated
SP4T 4-port latching, terminated
SP6T 6-port latching, terminated
SP6T 6-port latching, terminated
SP6T 6-port latching, terminated
6-port matrix, terminated
Low PIM Switch, 6-port matrix, terminated
4-port transfer
4-port transfer
4-port transfer
Low PIM Switch, 4-port transfer
DC – 4 GHz
DC – 20 GHz
DC – 26.5 GHz
DC – 4 GHz
DC – 20 GHz
DC – 26.5 GHz
DC – 20 GHz
DC – 20 GHz
DC – 26.5 GHz
DC – 40 GHz
DC – 50 GHz
DC- 26.5 GHz
5965-7841E
87406-80005
5965-3309E
5965-7842E
87606-80005
5968-2216E
87222-80007
L7104A
L7104B
L7104C
L7106A
L7106B
L7106C
SP4T 4-port latching, terminated
SP4T 4-port latching, terminated
SP4T 4-port latching, terminated
SP6T 6-port latching, terminated
SP6T 6-port latching, terminated
SP6T 6-port latching, terminated
DC – 4 GHz
DC – 20 GHz
DC – 26.5 GHz
DC – 4 GHz
DC – 20 GHz
DC – 26.5 GHz
5989-6030EN
L7204A
L7204B
L7204C
SP4T 4-port latching, un-terminated
SP4T 4-port latching, un-terminated
SP4T 4-port latching, un-terminated
DC – 4 GHz
DC – 20 GHz
DC – 26.5 GHz
L7206A
L7206B
SP6T 6-port latching, un-terminated
SP6T 6-port latching, un-terminated
DC – 4 GHz
DC – 20 GHz
L7206C SP6T 6-port latching, un-terminated DC – 26.5 GHz
L7222C 4-port transfer latching, terminated DC – 26.5 GHz 5989-6084EN
Terminated latching 3-port (SPDT)
Terminated latching 3-port (SPDT)
Terminated latching 3-port (SPDT)
Terminated latching 4-port (transfer)
Terminated latching 4-port (transfer)
Terminated latching 4-port (transfer)
Terminated latching 5-port
Terminated latching 5-port
Terminated latching 5-port
75 ohms Terminated (SPDT)
DC – 4 GHz
DC – 18 GHz
DC – 26.5 GHz
DC – 4 GHz
DC – 18 GHz
DC – 26.5 GHz
DC – 4 GHz
DC – 18 GHz
DC – 26.5 GHz
DC – 4 GHz
5952-1873E
5964-3704E
124
024: 24 VDC
T24: TTL/5 V
CMOS compatible
Included
024: 24 VDC
Included
24 VDC
024
Included
024
Position indicator option
402/403 2
DC connector option
Distribution board [number of switches/ board]
201
(DB9F)
Y1150A [8]
Y1152A [2]
Y1154A [6]
Bracket kit
(Cable kit) 3
3
Y1170A: L4491A
Y1171A: L4490A
(Y1157A)
Included
161
(16-pin DIP) Y1151A [2]
Included
N/A
161
(16-pin DIP)
Included
161
(16-pin DIP) Y1154A [2]
Included
161
(16-pin DIP) Y1151A [2]
Included
161
(16-pin DIP) Y1154A [2]
N/A
Solder terminals
(standard)
Y1152A [1]
Y1172A
(Y1159A)
Y1172A
(Y1159A)
Y1173A
(Y1158A)
Y1172A
(Y1159A)
Y1173A
(Y1158A)
3
4
84904M
84905M
84908M
8494G
8494H
8495G
8495H
8496G
8496H
8495K
8497K
Table 1. Common Agilent RF/Microwave Switches and Attenuators, continued
Switch model
Description Frequency range
Reference document number 1
Coil voltage option
Position indicator option
DC connector option
Distribution board [number of switches/ board]
Bracket kit 3
(Cable kit) 3
8765A
8765B
8765C
8765D
8765F
8766K
8767K
8768K
8769K
8767M
8768M
8769M
U9397A
U9397C
84904K
84904L
Coaxial (SPDT),SMA
Coaxial (SPDT),SMA
Coaxial (SPDT),3.5 mm
Coaxial (SPDT),2.4 mm
Coaxial (SPDT), 75 ohm, SMB
Coaxial (SP3T)
Coaxial (SP4T)
Coaxial (SP5T)
Coaxial (SP6T)
Coaxial (SP4T)
Coaxial (SP5T)
Coaxial (SP6T)
8 GHz Solid State
18 GHz Solid State
11 dB max, 1 dB steps, 4 sections
DC – 4 GHz
DC – 20 GHz
DC – 26.5 GHz
DC – 40 GHz
DC – 4 GHz
DC – 26.5 GHz
DC – 26.5 GHz
DC – 26.5 GHz
DC – 26.5 GHz
DC – 50 GHz
DC – 50 GHz
DC – 50 GHz
300 kHz-8 GHz
300 kHz–18
GHz
DC – 26.5 GHz
DC – 40 GHz
5952-2231E
5091-2679E
5959-7831
5988-2477EN
5989-6088EN
5963-6944
324
024
024
Included n/a n/a n/a n/a
Solder terminals
(with 324)
060
(12-pin
Viking)
Solder terminals
Y1155A [2]
Y1155A [1]
10-pin DIP Y1153A [2]
Y1175A
Y1175A
(Y1158A)
84906K
84906L
84907K
84907L
90 dB max, 10 dB steps, 4 sections
70 dB max, 10 dB steps, 3 sections
DC – 26.5 GHz
DC – 40 GHz
DC – 26.5 GHz
DC – 40 GHz
24 V
(standard) Included
10-pin DIP
(standard) Y1153A [2]
Y1174A
(Y1158A)
11 dB max, 1 dB steps, 4 sections
60 dB max, 10 dB steps, 3 sections
65 dB max, 5 dB steps, 4 sections
DC – 50 GHz
11 dB max, 1 dB steps, 4 sections
70 dB max, 10 dB steps, 3 sections
110 dB max, 10 dB steps, 4 sections
70 dB max, 10 dB steps, 4 sections
90 dB max, 10 dB steps, 4 sections
DC – 4 GHz
DC – 18 GHz
DC – 4 GHz
DC – 18 GHz
DC – 4 GHz
DC – 18 GHz
DC – 26.5 GHz
DC – 26.5 GHz
5988-2475EN
4
024 Included
10-pin DIP
(standard) Y1153A [2]
24 V
(standard) Included
12-pin Viking
(standard) Y1153A [2]
Y1174A
(Y1158A)
Y1175A
1 Product and technical overviews for the switches and attenuators listed can be obtained by document number from the Agilent RF &
Microwave Test Accessories web site. Go to http://www.agilent.
com/find/accessories, select ‘RF & Microwave Test Accessories,’ and search for the document number. Additional information can also be found in the ‘RF and Microwave Test Accessories Catalog’ accessible from this site. If viewing this document on-line, click on the reference document link.
2 Starting in June 2010, the current interrupt function (formerly Option
403) is a standard feature for these switches. The serial number information below shows which switch units have the current interrupt function included as standard.
N1810UL: Serial numbers MY07244672 and later
N1810TL: Serial numbers MY07247927 and later
N1811TL: Serial numbers MY07244660 and later
N1812UL: Serial numbers MY07240668 and later
3 Bracket kits apply to the L4490A and L4491A. These kits include pre-assembled control cables and hardware for mounting switches/ attenuators to the brackets and the bracket assemblies to the L4490A and L4491A RF Switch Platforms. Each bracket kit supports multiple switches (Table 2). The Cable-only kits are primarily used with the
34945A and L4445A, but can also be used with the L4490A and L4491A.
These cables must be assembled and each kit contains material to build multiple cables (Table 2).
4 Information on these attenuators plus additional information on other attenuators can be found in the latest version of the ‘RF and
Microwave Test Accessories Catalog.’
Step 2
Distribution Boards, Bracket
Kits, and Cable Kits
Switches and attenuators are connected to the Agilent 34945A and L4445A
Microwave Switch/Attenuator Drivers and the L4490A/L4491A RF Switch Platform through distribution boards installed on the 34945EXT module (see System
Interconnections Defined).
There are five distribution boards (Y1150A
– Y1154A) designed to allow Agilent’s most popular switches and attenuators to be driven directly. A sixth distribution board, the Y1155A, is designed to drive virtually any switch or attenuator by providing screw terminals to connect to relay coils and position indicators.
The distribution board required for each switch/attenuator model and the number of switches/attenuators supported per board (shown in brackets [ ]) are listed in Table 1.
The Y115x distribution boards are passive; they only provide socket headers or screw terminals that interface external devices to the 34945EXT. The distribution boards do provide access to position feedback signals that can be used to drive LED’s to visually represent a signal path, for example.
Bracket and Cable Kit Usage
There are six bracket kits and three cable kits available separately for switch/ attenuator installation and control (Table
1). The number of switches/attenuators supported per kit is summarized in Table 2.
The bracket kits apply to the L4490A and
L4491A Each bracket kit contains hardware for mounting the switch to the bracket and for mounting the bracket assembly in the chassis.
The cable-only kits are primarily used with the 34945A and L4445A, but can also be used with the L4490A and L4491A.
Figure 1. The Y1150A – Y1155A Distribution Boards
Table 2. Bracket and Cable Kit Usage
Kit number
Number of switches supported
Control cable included
Usage
L4490A/L4491A Bracket Kits
Y1170A 5 Yes
Y1171A 5 Yes
Y1172A 5 Yes
Y1173A
Y1174A
Y1175A
6
5
5
Yes
Yes
No
Notes
L4491A Five brackets per kit. Cable is pre-assembled.
L4490A Five brackets per kit. Cable is pre-assembled.
L4490A
L4491A Five brackets per kit. Cable is pre-assembled.
L4490A
L4491A
Three brackets per kit. Two switches per bracket.
Cable is pre-assembled.
L4490A
L4491A Five brackets per kit. Cable is pre-assembled.
L4490A
L4491A Five brackets per kit. No cable provided.
34945A/L4445A Cable Kits
Y1157A
Y1158A
Y1159A
4
2
2
—
—
—
34945A
L4445A
L4490A
L4491A
34945A
L4445A
L4490A
L4491A
34945A
L4445A
L4490A
L4491A
Cable only – must be assembled.
See Table 1 for applicable switches and attenuators.
Cable only – must be assembled.
See Table 1 for applicable switches and attenuators.
Cable only – must be assembled.
See Table 1 for applicable switches and attenuators.
5
6
RF Cable and Connector Suppliers
There are several suppliers for RF cables and connectors for the switches/attenuators used within the L4490A and L4491A
RF switch platforms. For convenience, three of these suppliers are listed below:
Pasternack Enterprises, Inc. http://www.pasternack.com
Micro-Coax ® http://www.micro-coax.com
S. M. Electronics L.L.C. http://www.smelectronics.us
Step 3
Switch/Attenuator Driver
Instruments and Platforms
For many applications, it is necessary to locate the switching device as close as possible to the DUT. Discrete switches and attenuators are used for this purpose. Optimum use of these devices requires switch/attenuator drivers that are specifically designed to provide the following features:
• Digital Outputs to drive relay coils in either pulsed or continuous drive mode,
• Digital Outputs that can drive switch position feedback LEDs,
• Digital Inputs to sense the position of the switches,
• Power distribution between the power supply, switches, and control logic,
• Report generation that indicates how often switches have been actuated.
These features are standard with the
Agilent 34945A and L4445A Microwave
Switch/Attenuator Drivers and the
L4490A/L4491A
RF Switch Platform.
The 34945A and L4445A
Microwave Switch/Attenuator
Drivers
For test systems requiring additional functionality, consider the 34945A Microwave
Switch/Attenuator Driver module. The
34945A is a one-slot, plug-in module used with the Agilent 34980A Multifunction
Switch/Measure Unit. The 34980A offers a 6.5 digit DMM, and supports a host of switching and control modules. LAN, GPIB, and USB interfaces plus a full-feature front panel are standard with the 34980A.
For dedicated or stand-alone RF/
Microwave switching applications, there is the L4445A Microwave Switch/
Attenuator Driver instrument. The L4445A is a 1U, ½-rack LXI (LAN eXtensions for
Instrumentation) version of the 34945A.
LXI is an instrumentation standard for devices that use the Ethernet (LAN) as their primary communications interface.
The 1U, ½-rack reference refers to the
L4445A’s physical size relative to standard
EIA rack cabinet dimensions.
Understanding what is included when the 34945A or L4445A is ordered and those accessories which must be ordered separately, simplifies the configuration process.
The following items are included with the
34945A and L4445A at shipment:
Item Description
5061-0701 LAN cross-over cable for direct PC to 34945A/L4445A connection.
8121-1289* 9-pin D-SUB extension cable for supplying +24 V to the
34945EXT module.
34945EXT Extender module
(one is automatically added to each 34945A and L4445A ordered.)
8121-1339 CAT-5E RJ45 cable
(included with the 34945EXT for communication between extender modules).
Typical connections of these system components are shown in Figure 2.
The L4490A/L4491A RF Switch
Platforms
Also for dedicated or stand-alone
RF/Microwave switching applications are the Agilent L4490A and L4491A RF
Switch Platforms. The 2U L4490A and 4U L4491A allow the mounting of switches and attenuators within a chassis.
Included with the L4490A and L4491A at shipment are:
Item Description
5061-0701 LAN cross-over cable for direct PC to L4490A/L4491A connection.
L4490-61603 9-pin D-SUB extension cable for supplying +24 V to the
34945EXT module.
34945EXT Extender module
(included in the L4490A and
L4491A chassis).
The internal configuration and typical system connections are shown in Figure 3.
*Not available from Agilent. Can be purchased locally or from the vendor L-COM (http:// www.l-com.com) as part number CRMN9MF-10.
*
LAN hub/switch
* = standard LAN cables
* or
LAN cross-over cables for direct
PC – 34980A/L4445A connection if PC is non Auto-MDIX
(cable p/n 5061-0701)
Agilent 34980A
+24 V
Agilent L4445A
I/O interfaces:
LAN
GPIB (optional)
Agilent Technologies
L4445A
M ic row av e Switch/Atte nuator Dr iv er
CO NT RO L BUS
AT TN
LAN
PWR
LAN
Re set
34945A Plug-in module
8121-1289
34945EXT #1
(master)
34945EXT #2
(1 st slave)
I/O interfaces:
LAN (shown)
GPIB
USB
+24 V
8121-1289
1 2
1
1
2
2
1 2
3
3
3
3 4
4
4
4
EXPAN SIO N BUS
PO RT2
PO RT1
N OT ET HERN ET
SEE MAN UAL
!
EXT ERN AL
+V
PO W ER IN PPU T
30 VD C MAX
I/ O AC CESS
Master 34945EXT connects to 1 on slaves are interchangesable.
st slave through Expansion Port 1. Expansion ports
8121-1339
EXPAN SIO N BUS
PO RT2
PO RT1
N OT ET HERN ET
SEE MAN UAL
!
EXT ERN AL
+V
PO W ER IN PPU T
30 VD C MAX
I/ O AC CESS
+V
Ext power
24V/12V/5V
Up to eight 34945EXT modules including the master per 34945A or L4445A
Figure 2. 34945A and L4445A External Connections
7
LAN hub/switch
* or
Cable p/n 5061-0701
*
* = standard LAN cables
LAN cross-over cables for direct PC –
L4490A/L4491A connection if PC is non Auto-MDIX
Agilent L4491A
+24 V supplied from L4491A
I/O interfaces:
LAN
GPIB (optional)
+24 V supplied from L4491A
34945EXT #1
(master)
Agilent L4490A
L4491A Option 002
34945EXT #2
1 st slave
*
Master 34945EXT connects to 1 on slaves are interchangeable.
st slave through Expansion Port 1. Expansion ports
+24 V supplied from L4490A External power supply required for all slave
34945EXT modules EXTERNAL to the L4490A/L4491A.
E X T E R N A L
P O W E R I N P U T
3 0 V D C M A X
+V
34945EXT #1
(master)
Up to seven slave 34945EXT modules per L4490A or L4491A
Figure 3. L4490A and L4491A Internal Configuration and Typical Connections
8
System Interconnections
Defined
The following sections describe the interconnections and components of the
34945A, L4445A, and L4490A/L4491A as shown in Figures 2 and 3.
PC to 34945A, L4445A, or L4490A/
L4491A
When connecting the PC directly to the
34980A (34945A), L4445A, or L4490A/
L4491A, the LAN cross-over cable (p/n
5061-0701) provided with the instruments is used. If your PC supports Auto-MDIX or contains a LAN card with Gigabit data transfer rates, the cross-over cable is not required. A standard LAN cable may be used instead. For network configurations that include a LAN switch or router between the PC and the instruments, standard LAN cables are used.
Connections from the PC to the 34980A
(34945A) are also available through the
34980A GPIB and USB ports. Connection via the optional GPIB interface is also available for the L4445A and L4490A/
L4491A. However, access to the instrument Web interfaces is only available through the LAN connection (see the product user’s guide).
34945A, L4445A, or L4490A/L4491A to 34945EXT
As described in Step 2, Microwave switches/attenuators are connected to the 34945A, L4445A, and L4490A/L4491A through distribution boards (Y1150A
– Y1155A) installed on the 34945EXT module. The 34945EXT is divided into four banks (1–4) organized by channel number.
Any distribution board may be installed in any bank, and multiple distribution boards of the same type may be installed on the same 34945EXT module.
Each 34945A or L4445A configuration must contain at least one 34945EXT module (a
“master”) with limits on the configuration as follows:
• up to eight 34945EXT modules allowed per 34980A mainframe which can consist of eight 34945A modules each with one 34945EXT module, a single 34945A module with up to eight
34945EXT modules, or any combination in between,
• up to eight 34945EXT modules allowed per L4445A.
The 34945A and L4445A are connected to the master 34945EXT using the 9-pin
D-Sub extension cable (8121-1289) through which +24 V is also supplied.
A (master) 34945EXT module is built into the L4490A and L4491A chassis. Up to seven 34945EXT modules (in addition to the master) are allowed per L4490A and L4491A. A second 34945EXT module
(the first slave) is available in the L4491A chassis as Option 002.
34945EXT to 34945EXT
Multiple (slave) 34945EXT modules are connected through the expansion bus ports using standard (i.e. non cross-over)
LAN cables. A LAN cable (p/n 8121-1339) is included with each 34945EXT for this purpose. The master EXT module must be connected to the first slave module via the
(master’s) Expansion Bus Port 1, and either
Port 1 or Port 2 of the slave EXT module.
The expansion ports on the slave modules are interchangeable.
34945EXT to External Power Supplies
All slave 34945EXT modules and those external to the L4490A or L4491A chassis must use an external power supply or supplies. The 34945EXT can only support one external voltage level (+24 V, +12
V, +5 V) at a time which applies to all distribution board banks on the 34945EXT.
An external supply can also be used with the master 34945EXT.
Distribution Board Channel
Numbering Schemes
The channel numbers associated with each bank on the 34945EXT are shown in the following chart. The channel syntax for the 34980A (34945A), L4445A, and
L4490A/L4491A is also shown.
Bank
Bank 1
Bank 2
Bank 3
Bank 4
Channels
(lower)
01 – 08
21 – 28
41 – 48
61 – 68
• 34945A
<slot #> <ext #> <ch #>
- slot #: 1-8 (34980A)
- ext # : 1-8 (34945EXT)
- ch #: see chart
Channels
(upper)
11 – 18
31 – 38
51 – 58
71 – 78
• L4445A
<1> <ext #> <ch #>
- ext # : 1-8 (34945EXT)
- ch #: see chart
• L4490A/L4491A
<1> <ext #> <ch #>
- ext # : 1-8 (34945EXT)
- ch #: see chart
34945EXT modules are numbered according to their position in the daisychain sequence relative to the master
34945EXT which is ext # 1.
System Diagnostics
Often the most common problems with switches/attenuators connected to the
34945EXT through distribution boards are related to the switch and attenuator cables. A seventh distribution board, the
Y1156A Verification Board, is used to provide visual confirmation of the signal path from the PC to distribution board banks
1–4. Verifying the path from the PC to a selected bank helps isolate suspected problems in the entire path from PC to switch.
Many Agilent switches contain position indicator options that allow for electronic verification of the switch position. The
34945EXT contains circuitry to detect these signals, and the Y1156A diagnostic board can also be used to test the functioning of this circuitry.
9
L4490A and L4491A RF Switch
Platform Product Options
There are five product options available for the L4491A and one option available for the L4490A. All options are factory installed and must be specified at the time of order. The product options include:
L4491A
• Option 001: multiport front panel. Front panel modification for mounting up to eight multiport switches. Includes mounting hardware. Switch cables must be ordered separately (Y1159A – Table
1).
• Option 002: Adds an additional
34945EXT module internal to the L4491A chassis (Figure 3).
• Option 004: Adds 16-bit digital IO and 28 bits of relay drive lines.
• Option 005: switch mounting – bays
(default option)
• Option 006: switch mounting – bottom tray
L4490A
• Option 004: Adds 16-bit digital IO and 28 bits of relay drive lines.
L4490A/L4491A Bracket
Layout Guidelines
Switches installed in the L4490A platform or in the L4491A platform with Option 006 can be mounted in any orientation that optimizes or simplifies switch or attenuator wiring.
For the L4491A with default
Option 005, switches and attenuators may be mounted in any of the “bays” and in any combination. Figure 5 shows the typical number of given brackets (Y1170A –
Y1175A) that can be installed in a bay.
Figure 4. L4490A/L4491A Product Option Locations
Figure 5. L4491A Mounting Brackets per Bay
10
Internal/External Power
Supply Considerations
As shown in Figures 2 and 3, the channel drive source for the master 34945EXT is provided through the internal +24 V power supply of the 34945A, L4445A, and
L4490A/L4491A. If necessary, external supplies can be used. For either case, the supply must meet the quiescent (continuous) and switching current requirements of the switches in your application.
Internal Supply
When using the internal +24 V supply of the 34945A or L4445A, the quiescent current draw must not exceed 100 mA, with a switching pulse current that does not exceed 200 mA. The duration of the switching pulse must be < 15 ms with a
25% duty cycle. The remainder of the duty cycle (75%) allows recovery time for the supply to provide the next pulse.
For the L4490A/L4491A, the quiescent and switching currents from the supply must not exceed the supply’s specification of
600 mA continuous.
When current limits are exceeded, overcurrent conditions can occur which shuts down the internal supply. When this happens, you must remove the device/ condition causing the overcurrent and reset or cycle power on the instrument.
The quiescent current requirement of the 34945EXTs themselves is accounted for by the internal supply rating and is not included in quiescent current and switching current calculations. Only the specified currents (quiescent, switching) of the switch must be considered.
As an example, the Agilent 87104/87106A,
B, C coaxial switches specify the following:
Supply current (switching: pulse width = 15 ms:Vcc = 24 VDC): 200 mA Nom
Supply current (quiescent): 50 mA Max
Using the internal +24 V supply, the current required for actuating a
87104/87106 switch is:
[87104/87106 quiescent current] + [87104/87106 switching current]
[50 mA] + [200 mA]
= 250 mA (15 ms pulse, 50 mA quiescent)
The number of switches available and their varying power requirements often make it difficult to determine if the capacity of the 34945A, L4445A, or L4490A/L4491A internal +24 V supply will be exceeded. If overcurrent conditions occur repeatedly the use of an external power supply may be required. Refer to the product user manuals for more information.
11
External Supply
Each 34945EXT module is limited to 2 A continuous current from an externally connected power supply (4.75 V to 30 V).
The actual amount of power required by each EXT module depends on the types of switches used.
When using an external power supply with either the master 34945EXT module or slave 34945EXT modules (required), the supply must be able to provide the quiescent current requirement of the EXT modules, plus the quiescent and switching currents of the switches themselves.
The power requirement of the 34945EXT is 1.2 W. For supported external supply voltages of 24 V,
12 V, and 5 V, the current required for a single EXT module is as follows:
Remember that the external supply must also meet the quiescent and switching current requirements of the switch. Using the Agilent 87104/87106A, B, C coaxial switches from the internal supply example, the switch specifications again are:
Supply current (switching: pulse width =15 ms:Vcc = 24 VDC): 200 mA Nom
Supply current (quiescent): 50 mA Max
The quiescent current required for the
34945EXT module is:
[34945EXT quiescent current from 24 V]
[24 V: 1.2 W / 24 V = 50 mA]
Therefore, the current required from an external supply for actuating a single
87104/87106 switch on a single 34945EXT module is: current = power / voltage
24 V: 1.2 W / 24 V = 50 mA
12 V: 1.2 W / 12 V = 100 mA
5 V: 1.2 W / 5 V = 240 mA
[34945EXT quiescent current from 24 V] + [switch quiescent current] + [switching current]
[24 V: 1.2 W / 24 V = 50 mA] + [50 mA] + [200 mA]
= 300 mA (15 ms pulse, 100 mA quiescent)
If multiple 34945EXT modules are driven by a single external supply, the power required from the supply increases by 1.2
W for each EXT module present. Thus, if two EXT modules are driven by a single supply, the power value in the equations becomes 2.4 W – doubling the current requirement.
In summary, when using an external supply, the current calculations must include the quiescent current requirement of the 34945EXT and the quiescent current requirement of each switch. These quantities are then added to the switching
(pulse) current requirement of the device.
12
System configuration chart
Switch/ attenuator
Quantity Options
* coil
* voltage
* connector
Distribution boards Quantity Bracket kit or cable kit
Related Agilent Literature
Data sheets
• Agilent 34980A Multifunction Switch/
Measure Unit
5989-1437EN
http://cp.literature.agilent.com/ litweb/pdf/5989-1437EN.pdf
• Agilent L4445A Microwave/Attenuator
Switch Driver
5989-4828EN
http://cp.literature.agilent.com/ litweb/pdf/5989-4828EN.pdf
• Agilent L4490A/L4491A RF Switch
Platform
5989-7857EN
http://cp.literature.agilent.com/ litweb/pdf/5989-7857EN.pdf
Application notes
• Test System Signal Switching, AN 1441-1
5988-8627EN
http://cp.literature.agilent.com/ litweb/pdf/5988-8627EN.pdf
• Benefits of a Switch/Measure Unit for Data Acquisition and Electronic
Functional Test
5989-1481EN
http://cp.literature.agilent.com/ litweb/pdf/5989-1481EN.pdf
• 34980A Multifunction Switch/Measure
System Modules Applications that benefit from specific module features/ functions
5989-2371EN
http://cp.literature.agilent.com/ litweb/pdf/5989-2371EN.pdf
For additional information please visit: http://www.agilent.com/find/34980A http://www.agilent.com/find/L4445A http://www.agilent.com/find/L449xA http://www.agilent.com/find/L4490A http://www.agilent.com/find/L4491A
13
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© Agilent Technologies, Inc. 2013, 2014
Published in USA, May 14, 2014
5989-2272EN
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