Keysight L7222C Service manual

Keysight L7222C
Coaxial Transfer Switch
Operating
and Service
Manual

Notices
Keysight L7222 Coaxial Transfer Switch Operating
and Service Manual
ii
Notices
© Keysight Technologies 2007, 2014
No part of this manual may be reproduced in
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tronic storage and retrieval or translation
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Manual Part Number
L7222-90001
Edition
Edition 2,August 2014
Printed in Malaysia
Keysight Technologies
Phase 3 Bayan Lepas Free Industrial Zone
Bayan Lepas, Penang 11900 Malaysia
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Keysight Technologies certifies that this prod-
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Technologies further certifies that its cali-
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Safety Notices
CAUTION
A CAUTION notice denotes a hazard. It calls
attention to an operating procedure, prac-
tice, or the like that, if not correctly per-
formed or adhered to, could result in
damage to the product or loss of important
data. Do not proceed beyond a CAUTION
notice until the indicated conditions are
fully understood and met.
WARNING
A WARNING notice denotes a hazard. It
calls attention to an operating procedure,
practice, or the like that, if not correctly per-
formed or adhered to, could result in per-
sonal injury or death. Do not proceed
beyond a WARNING notice until the indi-
cated conditions are fully understood and
met.

WEEE Compliance
Keysight L7222 Coaxial Transfer Switch Operating
and Service Manual iii
WEEE Compliance
This product complies with the WEEE Directive (2002/96/EC) marking
requirements. The affixed label indicates that you must not discard this
electrical/electronic product in domestic household waste.
Product Category: With reference to the equipment types in the WEEE Directive
Annex I, this product is classed as a "Monitoring and Control Instrumentation"
product.
Do not dispose in domestic household waste.
To return unwanted products, contact your local Keysight office, or
see www.keysight.com for more information.
Printing Copies of Documentation from the Web
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Contacting Keysight (Americas, Asia Pacific & Japan)
Keysight L7222 Coaxial Transfer Switch Operating
and Service Manual
iv
Contacting Keysight (Americas, Asia Pacific & Japan)
Online assistance: www.keysight.com/find/assist
Americas
Brazil
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number 5/6/05

Contacting Keysight (Europe)
Keysight L7222 Coaxial Transfer Switch Operating
and Service Manual v
Contacting Keysight (Europe)
Online assistance: www.keysight.com/find/assist
Europe
Austria
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number 5/6/05

Contents
Keysight L7222 Coaxial Transfer Switch Operating
and Service Manual
vi
Contents
Notices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii
WEEE Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii
Printing Copies of Documentation from the Web ................... . iii
Contacting Keysight (Americas, Asia Pacific & Japan). . . . . . . . . . . . . . . .. iv
Contacting Keysight (Europe) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
L-Series Coaxial Transfer Switch Overview . . . . . . . . . . . . . . . . . . . . . 1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Driving the Switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Standard Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Single Line TTL Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Dual Line TTL Drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electronic Position Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Environmental Specifications .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Physical Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Initial Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Operating Instruction . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Operator’s Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Performance Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Service Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Repair. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

General Information
Keysight L7222C Coaxial Transfer Switch Operating
and Service Manual 1
General Information
L-Series Coaxial
Transfer Switch
Overview
Keysight L7222C coaxial transfer switch is designed for flexibility in
signal routing applications and provides exceptional insertion loss
repeatability of 0.03 dB, low insertion loss and high isolation > 80 dB.
Figure 1L7222C Coaxial Transfer Switch
Table 1 shows general details of L7222C coaxial transfer switch.
Features •Guaranteed 0.03 dB insertion loss repeatability for 2 million cycles
•Excellent isolation, typically > 80 dB at 26.5 GHz
•Opto-electronic indicators and interrupts
•Magnetic latching
•TTL/5V CMOS compatible (optional)
Table 1General Information on L7222C Coaxial Transfer Switch
Model Frequency Range Configuration
L7222C DC to 26.5 GHz DPDT

General Information
Keysight L7222C Coaxial Transfer Switch Operating
and Service Manual
2
The L7222C can be used in a variety of applications such as switching two
inputs and two outputs, signal reversal switching or as a drop-out switch.
Innovative design and careful process control mean the L7222C meet the
requirements for highly repeatable switching elements in test instruments
and switching interfaces. L7222C offers exceptional insertion loss
repeatability, reducing sources of random errors in the measurement path
and improving measurement uncertainty.
Switch life is a critical consideration in production test systems, satellite and
antenna monitoring systems and test instrumentation. The longevity of this
switch increases system uptime and lowers the cost of ownership by
reducing calibration cycles and switch maintenance.
Opto-electronic interrupts and indicators improve reliability and extend the
life of the switch by eliminating DC circuit contact failures characteristic of
conventional electromechanical switches. The L7222C have circuits that
interrupt the current to all the solenoids once switching is complete and offer
independent indicators that are controlled by optical interrupts. These
indicators provide a closed path between the indicator common pin and the
corresponding sense pin of the selected path.
Figure 2 Keysight L7222C Coaxial Transfer Switch Schematic
+24 VDC (1)
Gnd. (9)
Drive A (3)
Drive B (5)
TTL Drive A (7)
TTL Drive B (8)
Control
Input
Position B
1-2
3-4
2-3
1-4
1
4
2
3
(4) (2) (6)
A Com B
Indicators
Control
circuit
Position A

General Information
Keysight L7222C Coaxial Transfer Switch Operating
and Service Manual 3
Driving the Switch
There are two positions for the L7222C coaxial transfer switch. See
Figure 3. Position A has RF Port 1 connected to RF Port 2 and RF Port 3
connected to RF Port 4. Position B has RF Port 2 connected to RF Port 3 and
RF Port 1 connected to RF Port 4. Either switch can be driven with a
standard grounding drive control with or without a separate ground. Single
line or Dual line TTL control are also available. The switch operates in a
break-before-make mode.
Figure 3(a) RF Port Connections and (b) Drive Connections
Table 2Standard Drive Control
RF path Standard drive voltage
Drive A Drive B
Pin 3 Pin 5
Position A Ground Open
Position B Open Ground
Table 3TTL Drive Control
RF path Single line TTL/5V CMOS drive
voltage Dual line TTL/5V CMOS drive voltage
TTL Drive A TTL Drive B TTL Drive A TTL Drive B
Pin 7 Pin 8 Pin 7 Pin 8
Position A High High High Low
Position B Low High Low High
1
3
5
7
9
2
4
6
8
10
Ribbon Cable
1
3
5
7
9
2
4
6
8
10
Ribbon Cable
PIN #
1
2
3
4
5
6
7
8
9
10
Function
+24 VDC
Ind. Comm.
Drive “A”
Ind. “A”
Drive “B’
Ind. “B”
TTL
TTL Compl.
Comm. Gnd.
Not Used
RF Port 1 is located directly behind
the 10-pin ribbon cable connector.
NOTE:
1
3
5
2
4
6
7
8
9
Solder Terminals
Standard Option 100
Position A
1to2
3to4
Position B
2to3
1to4
(a)
(b)

General Information
Keysight L7222C Coaxial Transfer Switch Operating
and Service Manual
4
Standard Drive •Connect pin 1 to supply voltage (+20 Vdc to +32 Vdc) and pin 9 to
ground. See Figure 3 for connection diagram and Table 2for standard
drive control.
NOTE Pin 9 does not need to be grounded for the switch to operate in standard
drive mode. If pin 9 is not grounded, the position indicators will only
function while the appropriate drive has ground applied. Therefore, if a pulse
drive is used and continuous indicator operation is required, pin 9 must be
grounded.
•Select position A by applying ground to pin 3.
•Select position B by applying ground to pin 5.
NOTE After the RF path is switched and latched, the drive current is interrupted by
the electronic position-sensing circuitry. Pulsed control is not necessary, but
if implemented, the pulse width must be 15 ms minimum to ensure that the
switch is fully latched.
Single Line TTL
Drive •Connect pin 1 to supply voltage (+20 Vdc to +32 Vdc) and pin 9 to
ground. See Figure 3 for connection diagram and Table 3for TTL drive
control.
NOTE For TTL drive, pin 9 must be grounded.
In addition to the quiescent current supplying the electronic position-sensing
circuitry, the drive current flows out of pin 9 (during switching) when using
TTL drive.

General Information
Keysight L7222C Coaxial Transfer Switch Operating
and Service Manual 5
•Select position A by applying TTL “High” to pin 7 and TTL “High” to
pin 8.
•Select position B by applying TTL “Low” to pin 7 and TTL “High” to
pin 8.
NOTE After the RF path is switched and latched, the drive current is interrupted by
the electronic position-sensing circuitry. Pulsed control is not necessary, but
if implemented, the pulse witdth must be 15 ms minimum to ensure that the
switch is fully latched.
Dual Line TTL
Drive •Connect pin 1 to supply voltage (+20 Vdc to +32 Vdc) and pin 9 to
ground. See Figure 3for connection diagram and Table 3 for TTL drive
control.
NOTE For TTL drive, pin 9 must be grounded
In addition to the quiescent current supplying the electronic position-sensing
circuitry, the drive current flows out of pin 9 (during switching) when using
TTL drive.
•Select position A by applying TTL “High” to pin 7 and TTL “Low” to
pin 8.
•Select position B by applying TTL “Low” to pin 7 and TTL “High” to
pin 8.
NOTE After the RF path is switched and latched, the drive current is interrupted by
the electronic position-sensing circuitry. Pulsed control is not necessary, but

General Information
Keysight L7222C Coaxial Transfer Switch Operating
and Service Manual
6
if implemented, the pulse width must be 15 ms minimum to ensure that the
switch is fully latched.

General Information
Keysight L7222C Coaxial Transfer Switch Operating
and Service Manual 7
Electronic Position Indicators
The electronic position indicators consist of optically isolated, solid state
relays which are driven by photo-electric sensors coupled to the mechanical
position of the RF path’s moving elements (See Figure 4). The circuitry
consists of a common which can be connected to an output corresponding to
either postition A or position B. The solid state relays are configured for AC
and/or DC operation. See Table 5for indicator specifications. The electronic
position indicators require that the supply (+20 to +32 VDC) be connected to
pin 1 but requires that pin 9 be grounded if pulse drive is used and
continuous indicators operation is desired. If pin 9 is not grounded, the
position indicators will function while the appropriate drive has ground
applied.
Figure 4Pin Function Diagram for Indicator
Pin number Function
2
4
6
Common
Position “A”
Position “B’

Specifications
Keysight L7222C Coaxial Transfer Switch Operating
and Service Manual
8
Specifications
Specifications refer to the performance standards or limits against which the
L7222C coaxial transfer switch is tested.
Typical characteristics are included for additional information only and they
are not specifications. These are denoted as "typical", "nominal" or
“approximate" and are printed in italics.
Table 4General Specifications for L7222C Coaxial Transfer Switch
Keysight Model Number L7222C
Maximum power rating
Switching1
1. Hot switching. For cold switching, see supplement specifications on page 9.
1W CW
Non-switching 50W Pk (not to exceed 1 W average)
Life 2 million cycles minimum
Switching Speed 15 ms
Table 5Indicator Specifications for L7222C Coaxial Transfer Switch
Keysight Model Number L7222C
Maximum withstand voltage 60 V
Maximum current capacity 100 mA
Maximum “ON” resistance 50 Ω
Maximum “OFF” resistance 1 G Ω

Specifications
Keysight L7222C Coaxial Transfer Switch Operating
and Service Manual 9
Table 6 RF Specifications for L7222C Coaxial Transfer Switch
Keysight Model Number L7222C
Frequency Range DC to 26.5 GHz
Insertion Loss 0.2 dB + 0.025 x Freq (GHz)
Isolation 110 dB - 2.0 x Freq (GHz)
SWR < 1.1 (DC to 2 GHz)
< 1.15 (2 to 4 GHz)
< 1.25 (4 to 12.4 GHz)
< 1.40 (12.4 to 20 GHz)
< 1.65 (20 to 26.5 GHz)
Repeatability < 0.03 dB typical
Characteristics 50 Ω
Connectors SMA (f)

Specifications
Keysight L7222C Coaxial Transfer Switch Operating
and Service Manual
10
Supplement Specifications (Cold Switching)
Figure 5illustrates the maximum incident CW power (cold switching) from
100 MHz to 18 GHz. The reference conditions are as below:
•Cold switching only (NO hot switching)
•Ambient temperature of 75oC or less
•Sea level (0.88 derating @15,000 feet)
•Low VSWR < 1.2 (See Figure 6 for derating above 1.2 VSWR)
Table 7Switch Drive Specifications for L7222C Coaxial Transfer Switch
Min Nominal Max Unit
Supply Voltage, Vcc 20 24 32 V
Supply Current, Icc 2001mA
Supply Current (quiescent) 25 50 mA
1. Switching: Pulse width > 15 ms: Vcc = 24 VDC
Table 8TTLDrive Specifications for L7222CCoaxialTransfer Switch(Option
T24)
Min Nominal Max Unit
High level input 3 7 V
Low level input 0.8 V
Max high input current11 1.4 mA
1. Vcc = Max, Vinput = 3.85 Vdc

Specifications
Keysight L7222C Coaxial Transfer Switch Operating
and Service Manual 11
Figure 5 Maximum Incident Power (Cold Switching) vs. Frequency
Figure 6 Power Derating Factor vs VSWR
Power derating factor versus VSWR
Power derating factor
VSWR (:1)
1 1.5 22.5 3
1
0.9
0.8
0.7
0.6
0.5

Environmental Specifications
Keysight L7222C Coaxial Transfer Switch Operating
and Service Manual
12
Environmental Specifications
The L-series multiport coaxial switches are designed to fully comply with
Keysight Technologies’ product operating environmental specifications as
shown in Table 9.
Table 9L7222C Coaxial Transfer Switch Environmental Specifications
Temperature:
Operating
Storage
Cycling
-25oC to +75oC
-55oC to +85oC
-55oC to +85oC, 10 cycles per MIL-STD-202F, Method 107D,
Condition A (modified)
Humidity:
Operating 95% RH at 65oC, 10 days per MIL-STD-202F, Method 106E
Shock:
Half-sine
Operating
500 G @ 0.5 ms, 3 drops/direction, 18 total
50 G @ 6 ms, 18 total
Vibration:
Operating
Survival
Random
7 G rms, 5 to 2000 Hz at 0.25 in p-p
20 G rms, 20 to 2000 Hz at 0.06 in p-p, 4 min/cycle, 4 cycles/axis
2.41 G rms, 10 minutes/axis
Altitude:
Storage <15,240 meters (50,000 feet) per MIL-STD-202F, Method 105C, Condition B
ESD Immunity:
Direct discharge
Air discharge
4 kV (to outer conductor) per IEC 61000-4-2
8 kV (to center conductor) per IEC 61000-4-2
RFI: Radiated Emission per CISPR 11