Pickering SYSTEM 10 User manual

Page (1)
LOW NOISE HIGH ISOLATION MULTIPLEXER 20-620-322
pickering
Issue 4.1 July 2019
User Manual
GPIB Low Noise High Isolation
Multiplexer Module
(Model No. 20-620-322)
pickeringtest.com pickering
SYSTEM 10/20
*Please contact Pickering for alternative
PXI/LXI/USB solutions
*

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Page (II) REED RELAY MODULE 40-110/115/120/125
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© COPYRIGHT (2019) PICKERING INTERFACES. ALL RIGHTS RESERVED.
No part of this publication may be reproduced, transmitted, transcribed, translated or stored in any form, or by
any means without the written permission of Pickering Interfaces.
Technical details contained within this publication are subject to change without notice.
ISO 9001
Reg No. FM38792

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LOW NOISE HIGH ISOLATION MULTIPLEXER 20-620-322
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Page (III)
REED RELAY MODULE 40-110/115/120/125
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TECHNICAL SUPPORT
For Technical Support please contact Pickering Interfaces either by phone, the website or via e-mail.
WARRANTY
All products manufactured by Pickering Interfaces are warranted against defective materials and workmanship for a period of
three years, excluding programmable power supplies, from the date of delivery to the original purchaser. Any product found to be
defective within this period will, at the discretion of Pickering Interfaces be repaired or replaced.
Products serviced and repaired outside of the warranty period are warranted for ninety days.
Extended warranty and service are available. Please contact Pickering Interfaces by phone, the website or via e-mail.
ENVIRONMENTAL POLICY
Pickering Interfaces operates under an environmental management system similar to ISO 14001.
Pickering Interfaces strives to full all relevant environmental laws and regulations and reduce wastes and releases to the
environment. Pickering Interfaces aims to design and operate products in a way that protects the environment and the health and
safety of its employees, customers and the public. Pickering Interfaces endeavours to develop and manufacture products that can
be produced, distributed, used and recycled, or disposed of, in a safe and environmentally friendly manner.
Worldwide Technical Support and Product Information
pickeringtest.com
Germany
Tel: [phone]
E-mail: [email protected]
Sweden
Tel: [phone]
E-mail: [email protected]
USA
Tel: (West) [phone]
Tel: (East) [phone]
E-mail: [email protected]
Czech Republic
Tel: [phone]
E-mail: [email protected]
France
Tel [phone]
E-mail [email protected]
Pickering Interfaces Headquarters
Stephenson Road Clacton-on-Sea CO15 4NL United Kingdom
Tel: [phone]
E-Mail: [email protected]
China
Tel: [phone]
E-mail: [email protected]

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Page (IV) GENERAL PURPOSE REED RELAY MODULE 10-110/115/120/125
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Page (IV) REED RELAY MODULE 40-110/115/120/125
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MEANING / DESCRIPTION SYMBOL
PROTECTIVE EARTH (GROUND)
To identify any terminal which is intended for connection to an external conductor for
protection against electric shock in case of a fault, or the terminal of a protective earth
(ground) electrode.
DANGEROUS VOLTAGE
To indicate hazards arising from dangerous voltages.
WARNING / CAUTION
An appropriate safety instruction should be followed or caution to a potential hazard
exists.
Refer to the relevant instructions detailed within the product manual.
HEAVY
If this product is heavy reference should be made to the safety instructions for
provisions of lifting and moving.
STATIC SENSITIVE
To indicate that static sensitive devices are present and handling precautions should
be followed.
!
kg
SAFETY SYMBOLS
PRODUCT SAFETY
The following safety symbols may be used on the product and throughout the product documentation.

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LOW NOISE HIGH ISOLATION MULTIPLEXER 20-620-322
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Copyright Statement ...................................................................II
Technical Support and Warranty................................................III
Product Safety .............................................................................IV
Contents (this page)....................................................................V
Warnings and Cautions ..............................................................VII
Section 1
Technical Specication...............................................................1.1
Section 2
Technical Description .................................................................2.1
Functional Description..........................................................2.1
Section 3
Installation....................................................................................3.1
Pre-Operation Checks...........................................................3.1
Hardware Installation ............................................................3.1
Software Installation .............................................................3.3
Self-Test..................................................................................3.4
Section 4
Programming Guide....................................................................4.1
Programming the Module .....................................................4.1
Section 5
Connector Information................................................................5.1
Section 6
Trouble Shooting.........................................................................6.1
Installation Problems ...........................................................6.1
Section 7
Maintenance Information............................................................7.1
Relay Lookup Tables.............................................................7.1
PCB and Component Layout................................................7.3
CONTENTS
Please use the hyperlinked text to navigate to the page required

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LOW NOISE HIGH ISOLATION MULTIPLEXER 20-620-322
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Page (VII)
GENERAL PURPOSE REED RELAY MODULE 10-110/115/120/125
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WARNINGS AND CAUTIONS
WARNING - HAZARDOUS ENVIRONMENTS SYMBOL
This product is not specically designed for use in hazardous environments, for example in explosive
atmospheres. If the product is to be used in hazardous environments we recommend that the user
ensures suitable protective measures are taken.
!
WARNING - DANGER OF ELECTRIC SHOCK SYMBOL
This module may contain hazardous voltages. Before removing the module from the rack remove all
supplies and disconnect user I/O signals.
Unused slots in the System 10/20 chassis are populated with blanking plates to prevent access
to user I/O signals that may be present. Blanking panels are available to order from Pickering in a
variety of slot widths. If the product is not used in this manner for example by using an extender card
then additional care must be taken to avoid contact with exposed signals.
CAUTION - HANDLING OF ELECTROSTATIC-SENSITIVE DEVICES SYMBOL
Certain semiconductor devices used in this equipment are liable to damage due to static voltage.
Observe the following precautions when handling these devices in their unterminated state, or
sub-assemblies containing these devices:
1. Persons removing sub-assemblies from equipment using these devices must be earthed by a
wrist strap and a resistor at the point provided on the equipment.
2. Soldering irons used during the repair operations must be low voltage types with earthed tips and
isolated from the mains voltage by a double insulated transformer.
3. Outer clothing worn must be unable to generate static charges.
4. Printed Circuit Boards (PCBs) tted with these devices must be stored and transported in
anti-static bags.
CAUTION - PRODUCT DOCUMENTATION SYMBOL
Suitably qualied & trained users should ensure that the accompanying documentation is fully read
and understood before attempting to install or operate the product.
!
SAFETY INSTRUCTIONS
SAFETY INSTRUCTIONS
All cleaning and servicing requires the equipment to be isolated and disconnected from the power source and user I/O
signals (refer to the Maintenance Section).
• Appropriate manual handling procedures should be followed as dictated by the weight of the individual module or
the combined weight of the modules & chassis.
• Should a fault occur with the module or chassis, immediately isolate and disconnect the incoming power to the
chassis and the user I/O signals.
• Ensure the equipment is installed, operated and maintained by trained and authorised personnel.

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Page 1.1
LOW NOISE HIGH ISOLATION MULTIPLEXER 20-620-322
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SECTION 1 - TECHNICAL SPECIFICATION
pickeringtest.com
GPIB Low Noise High Isolation Multiplexer 20-620
ISSUE 5.2 JUL 2019
• High Isolation Low Noise Multiplexer
Switching 1 Pole Plus Switched Shield
• Single or Dual Multiplexer Operation
• Uses High Quality Ruthenium Reed Relays For
Maximum Reliability
• Built-In Self Test
• Choice of Shielded Connectors: BNC or XLR
A High Isolation Very Low Noise Multiplexer, available as either
Single 16 to 1 or dual 8 to 1 with a choice of connector types. This
module is intended for high quality multiplexing of low frequency
signals up to 1MHz.
20-620 Multiplexer - For the highest quality switching applications
Applications will be found where general purpose multiplexers
have inadequate isolation and crosstalk performance. These
include: high quality data acquisition (usually 2-pole with
frequencies < 1MHz), audio broadcast/studio, low noise high
isolation instrumentation and very high quality signal routing in ATE
systems.
1
2
3
4
15
16
1
2
3
4
7
8
MU
X Bank 1
1
2
3
4
7
8
MUX Bank 2
The 20-620 is Available as Either a 16 to 1 or
Dual 8 to 1 Multiplexer
0 dB
-0.8 dB
-1.2 dB
-1.6 dB
-2.0 dB
-2.4 dB
-2.8 dB
-0.4 dB
10MHz 20MHz 30MHz
20-620 INSERTION LOSS
-3.2 dB
40MHz
Insertion Loss Plot For The 20-620 Multiplexer
-85 dB
-90 dB
-95 dB
-100 dB
25kHz 50kHz 75kHz
20-620 CROSSTALK – Channel to Channel
--105 dB
100kHz
--110 dB
Crosstalk Plot For The 20-620 Multiplexer
-40 dBm
250kHz 500kHz 750kHz
-80 dBm
1000kHz
-120 dBm
0 dBm
Unguarded noise is approx 5dB's Higher
Note: Measuring System Noise Floor = -120dBm
20-620 NOISE
Noise Performance For The 20-620 Multiplexer
*Please contact Pickering for alternative
PXI/LXI/USB solutions
*

Page 1.2 LOW NOISE HIGH ISOLATION MULTIPLEXER 20-620-322
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SECTION 1 - TECHNICAL SPECIFICATION
Low Noise High Isolation Multiplexer – 20-620
pickeringtest.com
Specifications
Electrical Specification
Maximum Switch Voltage:
Maximum High to Low Voltage:
Maximum Guard Voltage (Relative to Hi/Lo):
200V d.c.
100V d.c.
±100V d.c.
Maximum Power:
Maximum Switch Current:
Maximum Carry Current:
10W
0.5A
1.2A
On Path Resistance:
Off Path Resistance:
Differential Thermal Offset:
<300mΩ
>1x1010Ω
<5µV
Maximum Frequency (3dB in 50Ω system):
Capacitance, unselected channel to guard:
Capacitance, selected channel to guard:
Capacitance, unselected channel to common:
40MHz
<40pF
<70pF
<5pF
Expected Life (low power):
Expected Life (high power):
>1x108ops
>5x106ops
Switching Time: <15ms
Noise Level/dBm (0 to 1MHz in 50Ωsystem)
With Passive Guard:
With No Guard:
<-105dBm
<-100dBm
Safety & CE Compliance
All modules are fully CE compliant and meet applicable EU
directives: Low-voltage safety EN61010-1:2010, EMC Immunity
EN61326-1:2013, Emissions EN55011:2009+A1:2010.
Operating/Storage Conditions
Operating Conditions
Operating Temperature:
Humidity:
Altitude:
0°C to +55°C
Up to 90% non-condensing
5000m
Storage and Transport Conditions
Storage Temperature:
Humidity:
Altitude:
-20°C to +75°C
Up to 90% non-condensing
15000m
Programming
The 20-620 Multiplexer module is simple to program:
ARESET a Open all channels on device a
CHAN a,c Select channel con multiplexer a
When in dual 8 to 1 mode the address is
prexed by 1 or 2.
DELAY t Force a minimum delay of tmilliseconds
between two instructions
DIAGNOSTIC? Report any Self Test errors
RESET Open all switches on all modules
VIEW? a View status of device a
AC Performance (50Ω) 10kHz 100kHz 1MHz
Isolation, channel to common:
Isolation, channel to channel:
Isolation, bank to bank:
Isolation, module to module
>90dB
>90dB
>100dB
>100dB
>85dB
>78dB
>90dB
>100dB
>68dB
>70dB
>80dB
>90dB
Mechanical Characteristics
All modules conform to the 6U height (262mm) Eurocard standard
and are 160mm deep. Panel width is 2.4 Inches for the BNC
version and 3.6 Inches for the XLR type.
Connectors
Connection to the module front panel is via 18 screened
connectors. The screen for each connector is isolated from the
analogue common except when that channel is selected.
Relay Type
The modules are tted with Ruthenium Reed Relays.
All reed relays are manufactured by our sister company Pickering
Electronics: pickeringrelay.com