Pickering 40-265 User manual

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Issue 7.3 March 2021
40-265 User Manual
PXI Strain Gauge Simulator Module

Page (II) STRAIN GAUGE SIMULATOR MODULE 40-265
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Page (II) REED RELAY MODULE 40-110/115/120/125
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© COPYRIGHT (2021) 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

Page (III)
STRAIN GAUGE SIMULATOR MODULE 40-265
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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]

Page (IV) STRAIN GAUGE SIMULATOR MODULE 40-265
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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.

Page (V)
STRAIN GAUGE SIMULATOR MODULE 40-265
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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
Guidance on Using the Module............................................2.2
Section 3
Installation....................................................................................3.1
Pre Operation Checks...........................................................3.1
Hardware Installation ............................................................3.2
Software Installation .............................................................3.2
Testing Operation ..................................................................3.3
Section 4
Programming Guide....................................................................4.1
Programming Options For Pickering PXI Modules ............4.1
Module Architecture..............................................................4.2
Programming The Module ....................................................4.2
Using The Soft Front Panel ..................................................4.7
Section 5
Connector Information................................................................5.1
Section 6
Troubleshooting ..........................................................................6.1
Section 7
Maintenance Information............................................................7.1
Verication & Calibration......................................................7.2
Verication Test Results .......................................................7.4
CONTENTS

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Page (VII)
STRAIN GAUGE SIMULATOR MODULE 40-265
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Page (VII)
2 AMP 1-POLE UHD MATRIX MODULES 40-575 / 576 / 577 / 578 / 579
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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 host 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.
Not to be used in safety critical circuits, refer to the Pickering Interfaces’ terms & conditions of sale.
This module must not be used for the switching of Mains Circuits. For the switching of voltages up
to the module’s full specication, Secondary Circuit power supplies and the Device Under Test must
be fully isolated from the Mains Circuit and the safety earth.
The host chassis must be correctly installed and be connected to mains or factory safety ground,
please refer to your chassis installation manual.
Diagram Showing Separation Between The Mains Circuit and Secondary Circuit / DUT
For the purposes of this document, a Mains Circuit is an installation classied as Overvoltage
Category II up to 300V. Separation between the Secondary Circuit and Mains Circuit is achieved
by a transformer in which the primary windings are separated from the secondary windings by
reinforced insulation, double insulation, or a screen connected to the protective conductor terminal.
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.
PXI Switching
Module
Device
Under Test
Power
Supply
Power
Supply
Host Chassis
Secondary Circuit
Mains
Circuit
Mains
Circuit
Mains/Factory
Safety Ground

Page (VIII) STRAIN GAUGE SIMULATOR MODULE 40-265
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Page (VIII) 2 AMP 1-POLE UHD MATRIX MODULES 40-575 / 576 / 577 / 578 / 579
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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.
• For suitably equipped products in the event of an emergency press the red “emergency stop” button situated on
the front of the unit.

Page 1.1
STRAIN GAUGE SIMULATOR MODULE 40-265
pickering SECTION 1 - TECHNICAL SPECIFICATION
SECTION 1 - TECHNICAL SPECIFICATION
pickeringtest.com
PXI Strain Gauge Simulator Modules 40-265
ISSUE 7.1 OCT 2018
y
Simulates Resistive Strain Gauge Bridge Circuits
y6, 4 or 2 Simulators Per Module
ySimple Software Operation
yFine Resistance Adjustment Over Full Operating Range
yVISA, IVI & Kernel Drivers Supplied for Windows
ySupported by PXI or LXI Chassis
y3 Year Warranty
Diagram for a single channel of the
40-265 Strain Gauge Simulator
Calibration Port
Connector
Calibration
MUX
Programmable
Resistor
Exciation
Port
Bridge
Output
From Other Strain Gauge Channels
Internal
Excitation
Source
CH1 Excite1
CH1 Excite2
CH1 Out2
CH1 Out1
Resistive Strain Gauge
Simulator Channel 1 2 3 4 5 6
Pickering’s Range of PXI Precision Resistor Modules
Model Description Chan. Range Resolution Accuracy
40-260 Precision
Resistor
3 90 Ω - 8 kΩ <10 mΩ 0.1 %
40-261 21.5 Ω - 2.9 kΩ
or 10 Ω - 36 kΩ
<2 mΩ
or <15 mΩ 0.08 %
40-262
RTD
Simulator
18, 12
or 6
90 Ω - 250 Ω or
900 Ω - 2.5 kΩ
<8 mΩ
or <90 mΩ 0.1 %
40-263
4, 8, 12,
16, 20
or 24
40 Ω to 900 Ω,
200 Ω to 4.5 kΩ,
400 Ω to 9 kΩ
<10 mΩ, <50 mΩ
or <100 mΩ 0.1 %
40-265 Strain Gauge
Simulator
6, 4
or 2
350 Ω,
1 kΩ, 1.5 kΩ,
2 kΩ or 3 kΩ
<2 mΩ, <10 mΩ,
<12.5 mΩ, <20 mΩ
or <25 mΩ
0.03 % or
0.06 %
40-297 High Density
Precision
Resistor
18, 9,
6, 4
or 3
Up to 22.3 MΩ 0.125 Ω, 0.25 Ω,
0.5 Ω, 1 Ω or 2 Ω 0.2 %
40-298
Standard Resistor Modules
For applications that do not require the precision or accuracy of our
precision range, look to our Standard Resistor range which includes
models 40-280/1/2, 40-290/1, 40-292, 40-293, 40-294 and 40-295/6
Custom Resistor Modules
If our range of Resistor Modules does not meet your specific
requirements, please contact the sales office to discuss your application.
Customizations include: different start and stop values, current, power,
voltage, precision, accuracy, number of channels, connector etc.
The 40-265 is ideal for testing strain gauge meters in a wide
variety of industrial control systems. It provides 6, 4 or 2
channels of low cost simulation with excellent performance
and is a simple way of replacing in-house developed sensors. It
uses the same resistor bridge techniques of real-world strain
gauges, ensuring accurate emulation under all conditions.
Each channel has a bridge output and an excitation input that
can be driven with AC or DC. The bridge circuit uses three fixed
resistors and one programmable resistor with a narrow range,
fine adjustment and excellent accuracy. The range is sufficient
to simulate quarter, half or full bridge circuits. The standard
bridge impedances are 350 Ω, 1 kΩ, 1.5 kΩ, 2 kΩ and 3 kΩ.
The simulator is simple to use, the variable element can be
programmed using a resistance call. The user is given the
value required to balance the bridge, and the setting can be
varied above and below this value to simulate extension and
compression of a strain gauge.
A simple verification system is provided using a DMM
connected to the calibration port. This allows any channel to
be checked without disconnecting the module from the test
system. The calibration port can also be used to find the bridge
balance setting using the internal DC excitation source. Factory
calibration information and the excellent long term stability of
the bridge means adjustment is not routinely required.
We can offer strain gauge simulators with alternative
resistance ranges and have a wide range of precision
resistance modules that are suitable for simulating individual
strain gauges. Please contact the sales office for information.

Page 1.2 STRAIN GAUGE SIMULATOR MODULE 40-265
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SECTION 1 - TECHNICAL SPECIFICATION
Strain Gauge Simulator, 40-265
pickeringtest.com
Specifications
Power Requirements
+3.3 V +5 V +12 V -12 V
0 0.2 A (0.55 A Max) 0.1 A (0.2 A Max) 0.1 A
Operating/Storage Conditions
Operating Conditions
Operating Temperature:
Humidity:
Altitude:
0 °C to +55 °C
Up to 90 % non-condensing
5000 m
Storage and Transport Conditions
Storage Temperature:
Humidity:
Altitude:
-20 °C to +75 °C
Up to 90 % non-condensing
15000 m
PXI & CompactPCI Compliance
The module is compliant with the PXI Specification 2.2.
Local Bus, Trigger Bus & Star Trigger are not implemented.
Uses a 33 MHz 32-bit backplane interface.
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.
Calibration Port
Function: Allows connection to any of the strain gauge
bridges. Provides a simple means of checking
the operation of any of the strain gauges and
finding bridge balance points when internal
excitation source is selected. Can be used for
module verification procedures.
Also used by Pickering Interfaces for module
adjustment.
Software Support
Supplied with software that accepts a resistance
instruction. Soft Front Panel for Strain Gauge Simulator Modules
The 40-265 uses innovative techniques which are the
subject of protected Pickering intellectual property rights.
Specifications
Strain Gauge Channels
40-265
-01x
40-265
-20x
40-265
-40x
40-265
-30x
40-265
-10x
Number of
channels: 6, 4 or 2 per module
Channel
Configuration:
Independent excitation ports and
bridge output.
Resistor
Values: 350 Ω 1 kΩ 1.5 kΩ 2 kΩ 3 kΩ
Variable
Resistor: ±2 % ±5.3 %
Resolution: <2 mΩ <10 mΩ <12.5
mΩ <20 mΩ <25 mΩ
Variable
Resistor
Accuracy:
0.03 % 0.06 %
Excitation
Voltage*:
Up to ±10 V
peak (relative
to ground)
20
V peak-to-
peak, DC or
AC
†
Up to ±12 V peak
(relative to ground)
24
V peak-to-peak,
DC or AC
†
Bridge Output:
> ±0.45 % of
excitation
voltage ‡
> ±1.25 % of excitation
voltage ‡
* For full voltage rating, signal sources must be fully
isolated from mains supply and safety earth.
† Internal ±5 V DC source can be used. Excitation port is
disconnected when card power is off.
‡ Bridge Output disconnected when card power is off.
Mechanical Characteristics
Single slot 3U PXI (CompactPCI card).
Module weight: 240 g (40-265-016).
3D models for all versions in a variety of popular file
formats are available on request.
Connectors
PCI Interface: 33 MHz, 32-bit address, 16-bit data.
Strain Gauge channel signals via front panel 26-pin male
High Density D-Type connector. Calibration connection
via front panel 9-pin male D-Type connector. For pin outs
please refer to the operating manual.

Page 1.3
STRAIN GAUGE SIMULATOR MODULE 40-265
pickering SECTION 1 - TECHNICAL SPECIFICATION
Strain Gauge Simulator, 40-265
pickeringtest.com
Ordering Information
Mating Connectors & Cabling
For connection accessories for the 40-265 please refer
to the 90-009D 26-pin D-Type and 90-003D 9-pin D-Type
Connector Accessories data sheets where a complete list
and documentation can be found for accessories, or refer
to the Connection Solutions catalog.
Product Order Codes
6 Channel Strain Gauge Simulator:
350 Ω
1 kΩ
1.5 kΩ
2 kΩ
3 kΩ
40-265-016
40-265-206
40-265-406
40-265-306
40-265-106
4 Channel Strain Gauge Simulator:
350 Ω
1 kΩ
1.5 kΩ
2 kΩ
3 kΩ
40-265-014
40-265-204
40-265-404
40-265-304
40-265-104
2 Channel Strain Gauge Simulator:
350 Ω
1 kΩ
1.5 kΩ
2 kΩ
3 kΩ
40-265-012
40-265-202
40-265-402
40-265-302
40-265-102
Note: The 40-265-016 supersedes the 40-265-006. Both
modules have the same functionality but the -016 has a
resistor variation of ±2 % whereas the -006 has a resistor
variation of ±1 %.
Accessories:
Calibration port to DMM lead (shrouded 4mm bayonet plug):
For a single module (1x9 pin D-type)
For two modules (2x9 pin D-types)
For three modules (3x9 pin D-types)
40-975-009-SL1
40-975-009-SL2
40-975-009-SL3
(calibration leads capable of supporting a greater
number of modules are available, please contact sales
office)
Other Resistor Modules
Pickering Interfaces manufacture a range of variable
resistor modules in the PXI format. If you have a
requirement for a variable resistor module please contact
your local sales office with the information below and we
will advise you on the best solution for your application.
Lowest Resistance †
Highest Resistance
Resistance Resolution
Overall Accuracy
Maximum Power/Current
Number of Channels (variable resistors)
† Resistance is as measured across the user connector
terminals, minimum resistance must have a non-zero
value.
Product Customization
Pickering modules are designed and manufactured on our
own flexible manufacturing lines, giving complete product
control and enabling simple customization to meet very
specific requirements.
Customization can include:
• Alternative resistance range
• Alternative resolution
• Different number of channels
• Different performance specifications
All customized products are given a unique part number,
fully documented and may be ordered at any time in the
future. Please contact your local sales office to discuss.

Page 1.4 STRAIN GAUGE SIMULATOR MODULE 40-265
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SECTION 1 - TECHNICAL SPECIFICATION
Strain Gauge Simulator, 40-265
pickeringtest.com
Supporting Products & Software
We also offer customized cabling and have a free online Cable Design Tool
that can be used to create custom cable solutions for many applications.
Visit: pickeringtest.com/cdt to start your design.
Mass Interconnect
We recommend the use of a mass interconnect solution when an
Interchangeable Test Adapter (ITA) is required for a PXI or LXI based
test system. Our modules are fully supported by both Virginia Panel and
MacPanel.
Pickering Reed Relays
We are the only switch provider with in-house reed relay manufacturing
capability via our Relay Division. These instrument grade reed relays feature
SoftCenter™ technology, ensuring long service life and repeatable contact
performance. To learn more, please go to: pickeringrelay.com
Chassis Compatibility
This PXI module must be used in a suitable chassis. It is compatible with the following chassis types:
• All chassis conforming to the 3U PXI and 3U Compact PCI (cPCI) specification
• Legacy and Hybrid Peripheral slots in a 3U PXI Express (PXIe) chassis
• Pickering Interfaces LXI or LXI/USB Modular Chassis
Chassis Selection Guide
Standard PXI or hybrid PXIe Chassis from any Vendor:
• Mix our 1000+ PXI switching & simulation modules with
any vendor’s PXI instrumentation
• Embedded or remote Windows PC control
• Real-time Operating System Support
• High data bandwidths, especially with PXI Express
• Integrated module timing and synchronization
Pickering LXI or LXI/USB Modular Chassis—only accept
our 1000+ PXI Switching & Simulation Modules:
• Ethernet or USB control enables remote operation
• Low-cost control from practically any controller
• LXI provides manual control via Web browsers
• Driverless software support
• Power sequencing immunity
• Ethernet provides chassis/controller voltage isolation
• Independence from Windows operating system
Connectivity Solutions
We provide a full range of supporting cable and connector solutions for all our switching products—20 connector families
with 1200+ products. We offer everything from simple mating connectors to complex cables assemblies and terminal blocks.
All assemblies are manufactured by Pickering and are guaranteed to mechanically and electrically mate to our modules.
Connectors & Backshells Multiway Cable Assemblies RF Cable Assemblies Connector Blocks

Page 1.5
STRAIN GAUGE SIMULATOR MODULE 40-265
pickering SECTION 1 - TECHNICAL SPECIFICATION
Strain Gauge Simulator, 40-265
pickeringtest.com
Supporting Products & Software
© Copyright (2021) Pickering Interfaces. All Rights Reserved Pickering Interfaces maintains a commitment to continuous product development, consequently we reserve the right to vary from the description given in this data sheet.
Programming
Pickering provide kernel, IVI and VISA (NI & Keysight) drivers which are compatible with all Microsoft supported versions of
Windows and popular older versions. For a list of all supporting operating systems, please see: pickeringtest.com/os
The VISA driver is also compatible with Real-Time Operating Systems such as LabVIEW RT. For other RTOS support contact
Pickering. These drivers may be used with a variety of programming environments and applications including:
• Pickering Interfaces Switch Path Manager
• National Instruments products (LabVIEW, LabWindows/CVI, Switch Executive, MAX, TestStand, VeriStand, etc.)
• Microsoft Visual Studio products (Visual Basic, Visual C+)
• Keysight VEE and OpenTAP
• Mathworks Matlab
• Marvin ATEasy
• MTQ Testsolutions Tecap Test & Measurement Suite
Drivers for popular Linux distributions are available, other environments are also supported, please contact Pickering
with specific enquiries. We provide Soft Front Panels (SFPs) for our products for familiarity and manual control, as well as
comprehensive documentation and example programs to help you develop test routines with ease.
To learn more about software drivers and development environments, please go to: pickeringtest.com/software
Signal Routing Software
Our signal routing software, Switch Path Manager, automatically selects and energizes
switch paths through Pickering switching systems. Signal routing is performed by simply
defining test system endpoints to be connected together, greatly accelerating Test System
software development. To learn more, please go to: pickeringtest.com/spm
Diagnostic Relay Test Tools
eBIRST Switching System Test Tools are designed specifically for our PXI,
PCI or LXI products, these tools simplify switching system fault-finding by
quickly testing the system and graphically identifying the faulty relay.
To learn more, please go to: pickeringtest.com/ebirst
Three Year Warranty & Guaranteed Long-Term Support
All standard products manufactured by Pickering Interfaces are warranted against defective materials and workmanship
for a period of three years from the date of delivery to the original purchaser. Extended warranty and service agreements
are available for all our modules and systems with various levels to suit your requirements. Although we offer a 3-year
warranty as standard, we also include guaranteed long-term support—with a history of supporting our products for typically
15-20 years. To learn more, please go to: pickeringtest.com/support
Available Product Resources
We have a large library of product resources including success stories, product and support videos, articles and white
papers as well as application specific product brochures to assist when looking for the switching, simulation and
connection solutions you need. We have also published handy reference books on Switching Technology and for the PXI
and LXI standards.
To view, download or request any of our product resources, please visit: pickeringtest.com/resources

Page 1.6 STRAIN GAUGE SIMULATOR MODULE 40-265
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SECTION 1 - TECHNICAL SPECIFICATION
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Page 2.1
STRAIN GAUGE SIMULATOR MODULE 40-265
pickering SECTION 2 - TECHNICAL DESCRIPTION
SECTION 2 - TECHNICAL DESCRIPTION
FUNCTIONAL DESCRIPTION
A functional block diagram is provided in Figure 2.1. The Module is powered by +5V, +12V and -12V supplies via
Compact PCI connector J1. The interface to the 6, 4 or 2 strain gauge simulator channels is via a front panel mounted
26-pin high density D-type plug, connection to the Calibration Port is via a front panel mounted 9-pin D-type plug.
The module comprises a mother and daughter PCB populated with 6, 4 or 2 separate precision bridge networks.
Each bridge has xed resistors on three arms, the fourth arm consists of a precision programmable resistor network,
electro-mechanical relays are used for isolation. There is also a multiplexer to allow a selected channel to be routed
to the Calibration Port for connection to a DMM. The coils of the electro-mechanical relays are enabled via control
signals from relay drivers U1 to U5 on the module’s daughter card. The relay drivers are addressed by the PLX
device U1 to output the required signal.
Drivers
U1 to U5
on
Daughter
Card
PLX
U1
Flash PROM
U2
Terminating
Resistors
R1 to R12
Compact PCI
Bus
Connector
J1
0V
-12V
Control
Switches
6, 4 or 2 Channel Strain Gauge
Simulator & Calibration
Multiplexer
Calibration Port
Connector
Calibration
MUX
PROGRAMMABLE
RESISTOR
EXCITATION PORTBRIDGE OUTPUT
FROM OTHER STRAIN
GAUGE CHANNELS
Internal
Excitation
Source
CH1 Excite1
CH1 Excite2
CH1 Out2
CH1 Out1
2 3 4 5 6
+5V
+12V
Figure 2.1 - Strain Gauge Simulator Module 40-265: Functional Block Diagram

Page 2.2 STRAIN GAUGE SIMULATOR MODULE 40-265
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SECTION 2 - TECHNICAL DESCRIPTION
GUIDANCE ON USING THE MODULE
The 40-265-01x strain gauge simulator consists of 6, 4 or 2 bridge networks with a resistance of 350Ω in each arm.
One arm is a precise but adjustable resistor, the value of which can be varied ±2% of 350Ω with a resolution of
2mΩ. It can be used to simulate the extension or compression of the typical types of strain gauge found in many
control systems. The 40-265-10x, 40-265-20x, 40-265-30x and 40-265-40x versions of this card operate in exactly
the same way, but the 40-265-10x has a bridge resistance of 3kΩ and a resolution of 25mΩ, the 40-265-20x has a
bridge resistance of 1kΩ and a resolution of 10mΩ, the 40-265-30x has a bridge resistance of 2kΩ and a resolution
of 20mΩ, and the 40-265-40x has a bridge resistance of 1.5kΩ and a resolution of 12.5mΩ, each with adjustment
of +/-5.3%.
The 40-265 responds directly to a request for a particular value of resistance and is therefore very easy to use in
a system. Applications programs are easily generated to convert mechanical stimulus data to resistance values for
different types of strain gauges that are to be simulated.
Each simulator channel has two “Bridge Output” connections and two “Excitation Port” connections. The excitation
connection is fed from a voltage source in the range ±10V (-01x) or ±12V (-10x, -20x, -30x and -40x) and the bridge
output connects to the UUT. Each of the 6, 4 or 2 channels is a separate bridge circuit with an individually adjustable
resistance element and it’s own external connections as shown in Figure 2.2.
Quarter, Half and Full Bridges
Strain gauge resistors are usually deployed in a bridge circuit with either, one, two or four stressed strain gauge
resistors present. Where quarter and half bridges are used the remaining resistors in the bridge are usually strain
gauge resistors that are not under load so that any temperature effects in the resistor cancel out – strain resistors
often have a high but consistent temperature coefcient because of their construction and the bridge remains
balanced.
In a half bridge system the bridge will use two xed resistors and two strain resistors under load. If both strain
resistors have the same response (both increase or decrease resistance when under the same load) then the strain
resistors are placed in diagonally opposite arms of the bridge. If their reaction is opposite (one increases while the
other decreases, for example when one is on the underside of a beam and the other is on top) they are placed on
the same side of the bridge.
In a full bridge system all four resistors are stressed resistors, two being arranged to be under compression while
the other two are under tension for the same load. This increases the output voltage variation from the system. The
40-265 is highly stable with temperature and has an output range that is adequate to simulate the characteristics of
a full bridge even though just one arm is adjustable. Because the ne resistance control range is adequately large
and the bridge output voltage impact is equivalent the 40-265 is capable of simulating quarter, half or full bridges.
Figure 2.2 - Each strain gauge channel is a separate bridge with one adjustable arm and
channel output and excitation input connections.
CHANNEL 1
BRIDGE OUTPUT
CHANNEL n
EXCITATION PORT BRIDGE OUTPUT EXCITATION PORT
CH1 Out1CH1 Out2 CHn Out2 CHn Out1CH1 Excite1CH1 Excite2 CHn Excite1CHn Excite2
“BRIDGE CONNECTIONS” CONNECTOR

Page 2.3
STRAIN GAUGE SIMULATOR MODULE 40-265
pickering SECTION 2 - TECHNICAL DESCRIPTION
Strain gauge resistors also come with different values of non-stressed resistance. In many cases the 40-265 is
suited to simulating other values since the resistor value only inuences the bridge in two ways:
• Bridge output resistance, which can be increased by adding equal resistors on each output
• Excitation voltage load current, which is usually something that most sources can cope with.
Using The Bridge
In normal use the bridge monitoring system will provide the Excitation Voltage to the bridge and then measure
the bridge output voltage as a differential voltage. The output voltage from the bridge is a function of how far from
balance the bridge is and the voltage applied to the Excitation Port (the more voltage applied the greater the change
of voltage).
The 40-265 calibration data includes the resistance value at which the bridge is balanced. This will not be precisely
350Ω in the case of 40-265-01x, it could for example be 350.05Ω. If the variable resistor is set to 350.05Ω in this
example the bridge is simulating a balanced condition.
If the variable resistor is changed to 350.1Ω it will simulate the condition where a quarter bridge has a resistor under
a stress equivalent to 0.05Ω change. In the case of half bridge it is the equivalent of stress arising from 0.025Ω
change in each of the two resistors. In the case of a full bridge it is equivalent to the stress arising from 0.0125Ω
change.
The bridge balanced value is set using the internal excitation source of ±5V at a xed temperature. In working test
systems users will nd it may be advantageous to establish their bridge balance value that reects the excitation
voltage and temperature the module is being used. The 40-265 is very stable, much more so than strain gauge
resistors achieve, so for most applications this will not be necessary.
Strain gauge resistors typically have a maximum range of 0.1% from the non stressed value, so the range of 40-265
is adequate to simulate a full bridge.
Simulating A Single Resistor
Pickering Interfaces also manufacture a range of precision resistor modules with ne resistance control that can
simulate a wide range of resistors. Please visit pickeringtest.com for details.
Calibration Port
The calibration port is primarily used when the module is calibrated in the factory for the purpose of generating a le
of correction data that ensures each channel can be set to the requested value. However, it can be used to monitor
a channel’s output voltage as well as determine its balance point.
Customer connection to the calibration port in most cases will not be required.
The 40-265 accuracy is specied over a range of temperatures and is stable with time. Please refer to Section 7.2,
“Verication & Calibration”.
The details that follow are documented in this manual to allow maximum customer exibility. Adjustment to the
internal calibration values in normal operation should not be required please also refer to the “Verication &
Calibration” section.

Page 2.4 STRAIN GAUGE SIMULATOR MODULE 40-265
pickering
SECTION 2 - TECHNICAL DESCRIPTION
The calibration port is designed so that it can be daisy chained with other resistor modules (for example multiple
modules of 40-265). A cable assembly can be purchased as an accessory for this purpose or the user can make
their own as shown in Figure 2.3.
This feature is particularly useful when in system monitoring or verication is needed since one DMM can sequentially
access all the channels in a system without any additional switching.
Figure 2.3 - The calibration port can be daisy chained between modules to allow one DMM to
support multiple modules for verication or measurement purposes.
40-265
6½ Digit DMM
40-265
V,Ω+ I+ V,Ω- I-
1
2
3
4
6
7
8
9
1
2
3
4
6
7
8
9
TO OTHER
MODULES
Calibration Cable:
40-975-009-SL1 (for single module),
40-975-009-SL2 (for two modules) or
40-975-009-SL3 (for three modules).
Source+
Sense+
Source-
Sense-
Source+
Sense+
Source-
Sense-
Source+
Sense+
Source-
Sense-
Bridge Connections
Bridge Connections

Page 3.1
STRAIN GAUGE SIMULATOR MODULE 40-265
pickering SECTION 3 - INSTALLATION
Page 3.1
REED RELAY MODULE 40-110/115/120/125
pickering SECTION 3 - INSTALLATION
kg
PREOPERATION CHECKS (UNPACKING)
1. Check the module for transport damage and report any damage immediately to Pickering Interfaces.
Do not attempt to install the product if any damage is evident.
2. Position the chassis relative to any other equipment the module(s) will connect with. Ensure the chassis is not
connected to the electrical supply.
3. Ensure that the designated area for the chassis containing the module is of at and solid construction to
withstand and support the combined weight of the module(s) and chassis.
SECTION 3 - INSTALLATION
!
Refer to the Warnings and Cautions at the front of this manual
Modular products require installation in a suitable PXI/LXI chassis. The module is designed for indoor use only.
Figure 3.1 - Installing the Module into a PXI/cPCI/LXI Chassis
PXI / LXI Chassis

Page 3.2 STRAIN GAUGE SIMULATOR MODULE 40-265
pickering
SECTION 3 - INSTALLATION
Page 3.2 REED RELAY MODULE 40-110/115/120/125
pickering
SECTION 3 - INSTALLATION
SOFTWARE INSTALLATION
First install the appropriate Pickering PXI switch card drivers by running the installer program Setup.exe (provided
in a compressed zip le), either from the CD-ROM supplied, or by downloading the latest version from our website
pickeringtest.com - the recommended method. Setup is accompanied by a ReadMe le containing
additional installation information. A single installation covers all cards in the System 40, System 45 and System
50 ranges.
When installation completes, the installed drivers’ ReadMe le is offered for display. It can also be displayed
later using a shortcut on the Programs>>Pickering menu.
If you are not a LabVIEW user you should choose the “full” version, and once that has been installed run
the LabVIEW Runtime Engine installer via the shortcut on the Programs>>Pickering menu. In the absence of
LabVIEW the Runtime Engine is required to support the Pickering Test Panels application.
!
HARDWARE INSTALLATION
ELECTRICAL CONNECTION (CHASSIS)
1. The chassis must be electrically installed in accordance with local regional electrical codes by a qualied
engineer.
2. The chassis must be grounded.
Electrostatic discharge can damage the components on the module. To avoid such damage in handling the
board refer to page VII.
Ensure that there is adequate ventilation.
The module should be installed in accordance with the following procedure:
1. Ensure that the system is turned OFF but still connected to mains so that it remains grounded.
2. Choose an appropriate slot in the rack.
3. Remove the blanking plate for the chosen slot.
4. Ensure that the injector/ejector handle is in its downward position. Align the module with the card guides on
the top and bottom of the slot.
Do not raise the injector/ejector handle whilst inserting the module as the module will not insert properly.
5. Hold the handle whilst slowly sliding the module into the card guides until the handle catches on the injector/
ejector rail (refer to Figure 3.1).
6. Raise the injector/ejector handle until the module rmly seats into the backplane. The front panel of the
module should be ush with the front panel of the chassis.
7. Secure the front panel of the module using both screws to the chassis front panel mounting rails.
8. In a system employing a remote control interface to connect an external controller to a PXI chassis or to link
multiple chassis, power-up the system as follows:
a. For a system comprising an external controller and one chassis, power up the chassis before powering up
the external controller.
b. For a system comprising more than one chassis, turn ON the last chassis in the system followed by the
penultimate, etc, and nally turn ON the external controller or chassis containing the system controller.
9. For Pickering Interfaces modular LXI installation there is no requirement to use any particular power up
sequence.