Pickering 41-735 User manual

pickeringtest.com
Issue 6.6 October 2022
41-735/736 User Manual
PXI Programmable Power Supply Module

Page ii
pickering
PROGRAMMABLE POWER SUPPLY MODULE 41-735/736
Page (II) REED RELAY MODULE 40-110/115/120/125
pickering
© COPYRIGHT (2022) 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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PROGRAMMABLE POWER SUPPLY MODULE 41-735/736
Page (III)
REED RELAY MODULE 40-110/115/120/125
pickering
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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PROGRAMMABLE POWER SUPPLY MODULE 41-735/736
Page (IV) REED RELAY MODULE 40-110/115/120/125
pickering
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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PROGRAMMABLE POWER SUPPLY MODULE 41-735/736
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
41-735 ............................................................................ 1.1
41-736 ............................................................................ 1.5
Section 2
Technical Description ........................................................ 2.1
Functional Description................................................. 2.1
Cascading Monitor Ports............................................. 2.3
Section 3
Installation........................................................................... 3.1
Hardware Installation ................................................... 3.1
Soft Front Panel Installation........................................ 3.2
Soft Front Panel Operation.......................................... 3.3
Section 4
Programming Guide........................................................... 4.1
Programming Options For Pickering PXI Modules ... 4.1
Card Specic Information............................................ 4.3
Section 5
Connector Information....................................................... 5.1
Section 6
Trouble Shooting................................................................ 6.1
Section 7
Maintenance Information................................................... 7.1
Software Update ........................................................... 7.1
Maintenance ................................................................. 7.2
Component Layout....................................................... 7.5
CONTENTS

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PROGRAMMABLE POWER SUPPLY MODULE 41-735/736
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SECTION 1 - TECHNICAL SPECIFICATION
Page 1.1
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PROGRAMMABLE POWER SUPPLY MODULE 41-735/736
SECTION 1 - TECHNICAL SPECIFICATION
pickeringtest.com
PXI Dual Programmable +10V Power Supply 41-735
ISSUE 8.7 OCT 2022
yDual Output Non-Isolated Power Supply
yFast Transient Load Response <25µs
yLow Noise Outputs For Testing Sensitive Devices
yFine 16-bit Output Voltage Control For Evaluating
Device Characteristics
yUp To 1 Amp and 10V Output On Each Channel
yPort For High Accuracy Current Monitoring With DMM
yLeakage Measurement Capability
yRemote Sense Lines
yPXI Backplane Or External Source Of Power
ySingle Slot 3U Instrument
yVISA Drivers Supplied For Windows
Plus Soft Front Panel
ySupported in PXI or LXI Chassis
y3 Year Warranty
41-735 Soft Front Panel
The 41-735 is a single slot power supply module providing
two programmable positive output voltages. The module
produces high quality regulated voltages from a linear
regulator to ensure low levels of output noise. The module
is perfect for exercising power to low power test targets
and provides fine control of the DC output to allow accurate
characterisation of device sensitivity and efficiency.
The module allows the power to be supplied either from
the PXI +12V chassis supply or from an external power
source.
Remote sense connections on both the positive and ground
outputs are used to regulate the output voltage at the
load, ensuring that wiring voltage drops do not affect
measurement accuracy.
The monitor facility provides a simple and effective method
of connection a DMM or Data Acquisition device. It allows
the output voltages at the front panel or the load to be very
accurately measured and for the current consumption of
the load to be calculated. A special mode can be invoked to
allow the measurement of leakage or standby current for
devices with power sensitive applications. The monitor port
is available on both the D-type connector and a dedicated
monitor connector which allows easy daisy chaining of
modules with a single DMM.
The 16-bit setting resolution of the output voltage
combined with the accurate monitoring facility is perfect
for characterizing device performance as a function of
supply voltage.

Page 1.2
SECTION 1 - TECHNICAL SPECIFICATION
PROGRAMMABLE POWER SUPPLY MODULE 41-735/736
pickering
Dual +10V Power Supply, 41-735
pickeringtest.com
Overview
41-735 Transient Response (Typical)
-0.200
-0.100
0.000
0.100
0.200
0.300
0.400
0.500
0.600
-30.000 -20.000 -10.000 0.000 10.000 20.000 30.000 40.000
Time / µs
Volts / V
6.1V (0.8A - 0.4A)
Trigger Pulse
41-735 Transient Response (Typical)
-0.600
-0.400
-0.200
0.000
0.200
0.400
0.600
-30.000 -20.000 -10.000 0.000 10.000 20.000 30.000 40.000
Time / µs
Volts / V
7.5V (0.4A - 0.8A)
Trigger Pulse
Transient Response Plots For 41-735 Power Supply Module
Block Diagram for 41-735 Power Supply Module

SECTION 1 - TECHNICAL SPECIFICATION
Page 1.3
pickering
PROGRAMMABLE POWER SUPPLY MODULE 41-735/736
Dual +10V Power Supply, 41-735
pickeringtest.com
Specifications
Specification
Output Voltage: 0 to +10V, o/p is referenced
to GND.
Remote Sense: Provided on positive
and ground connections,
maximum voltage drop
300mV on power connection
leads.
If sense is not connected
automatically regulates the
front panel voltage.
Voltage Accuracy: ±0.5%, ±25mV. Output
voltage can be monitored
through monitor port.
Voltage Setting: 16-bit resolution.
Transient Response: <25µs
Number of Channels: 2
Output Current: 1 Amp each channel.
When power is taken from
the PXI chassis current
consumption is limited to
1 Amp total.
Sense Connection: On each output, the sense
connection will compensate
for a maximum voltage drop
of 300mV on power feeds.
Sense connections can
be enabled and disabled
under software control and
include sense of remote
ground.
Load Ripple: <<1mV measured from 10Hz
to 100kHz
Protection: Short circuit protection.
Thermal protection. Chassis
+12V supply is protected
by an active current limiter.
Protected from accidental
application of reverse
voltages to 25V.
Monitor: Built in Pickering Interfaces
Monitor allows the use of an
external DMM to measure
voltage and current. Voltage
measurement accuracy is
as the DMM ±30µV. Load
current is measured across
a sense resistor. Accuracy
is 1% ±0.3mA. Accuracy can
be improved by using sense
resistor calibration
Power Requirements
+3.3V +5V +12V -12V
0 0.15A Up to 1A 0.05A
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
PXI & CompactPCI Compliance
The module is compliant with the PXI Specification
2.2. Local Bus, Trigger Bus and Star Trigger are not
implemented.
Uses a 33MHz 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.*
Mechanical Characteristics
Single slot 3U PXI (CompactPCI card).
3D models for all versions in a variety of popular file
formats are available on request.
Connectors
PXI bus via 32-bit P1/J1 backplane connector.
Power supply outputs via front panel 25-pin male D-type
connector, for pin outs please refer to the operating
manual.
Leakage Monitor: Allows the measurement of
leakage current. Maximum
current is 10µA. Accuracy
±2% ±3nA
Load Regulation: Recovers in 20µs from a load
current change of 1 Amp (full
load).
On/Off Control: Separate from voltage setting
control. 20µs rise and fall time
(no additional capacitive load,
load current 1A).

Page 1.4
SECTION 1 - TECHNICAL SPECIFICATION
PROGRAMMABLE POWER SUPPLY MODULE 41-735/736
pickering
Dual +10V Power Supply, 41-735
pickeringtest.com
Ordering Information
Mating Connectors & Cabling
For connection accessories for the 41-735 module please
refer to the 90-008D 25-pin D-type Connector Accessories
data sheet where a complete list and documentation
can be found for accessories, or refer to the Connection
Solutions catalog.
Product Order Codes
Dual Programmable +10V Power Supply 41-735-001
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.
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.

SECTION 1 - TECHNICAL SPECIFICATION
Page 1.5
pickering
PROGRAMMABLE POWER SUPPLY MODULE 41-735/736
pickeringtest.com
PXI Dual Programmable -10V Power Supply 41-736
ISSUE 5.7 OCT 2022
yDual Output Non-Isolated Power Supply
yLow Noise Outputs For Testing Sensitive Devices
yFine 16-bit Output Voltage Control For Evaluating
Device Characteristics
yUp To 1 Amp and -10V Output On Each Channel
yPort For High Accuracy Current Monitoring With DMM
yLeakage Measurement Capability
yRemote Sense Lines
yPXI Backplane Or External Source Of Power
ySingle Slot 3U Instrument
yVISA Drivers Supplied For Windows
Plus Soft Front Panel
ySupported in PXI or LXI Chassis
y3 Year Warranty
41-736 Soft Front Panel
41-736 Schematic Overview
The 41-736 is a single slot power supply module
providing two programmable negative output voltages.
The module produces high quality regulated voltages
from a linear regulator to ensure low levels of output
noise. The module is perfect for exercising power to
low power test targets and provides fine control of the
DC output to allow accurate characterisation of device
sensitivity and efficiency.
The module allows the power to be supplied either from
the PXI -12V chassis supply or from an external power
source.
Remote sense connections on both the positive and
ground outputs are used to regulate the output voltage
at the load, ensuring that wiring voltage drops do not
affect measurement accuracy.
The monitor facility provides a simple and effective
method of connection a DMM or Data Acquisition device.
It allows the output voltages at the front panel or the
load to be very accurately measured and for the current
consumption of the load to be calculated. A special mode
can be invoked to allow the measurement of leakage
or standby current for devices with power sensitive
applications. The monitor port is available on both the
D-type connector and a dedicated monitor connector
which allows easy daisy chaining of modules with a
single DMM.
The 16-bit setting resolution of the output voltage
combined with the accurate monitoring facility is perfect
for characterizing device performance as a function of
supply voltage.

Page 1.6
SECTION 1 - TECHNICAL SPECIFICATION
PROGRAMMABLE POWER SUPPLY MODULE 41-735/736
pickering
Dual -10V Power Supply, 41-736
pickeringtest.com
Specifications
Specification
Output Voltage: 0 to -10V, o/p is referenced
to GND.
Remote Sense: Provided on negative
and ground connections,
maximum voltage drop
300mV on power connection
leads.
If sense is not connected
automatically regulates the
front panel voltage.
Voltage Accuracy: ±0.5%, ±25mV. Output
voltage can be monitored
through monitor port.
Voltage Setting: 16-bit resolution.
Number of Channels: 2
Output Current: 1 Amp each channel.
When power is taken from
the PXI chassis current
consumption is limited to
1 Amp total.
Sense Connection: On each output, the sense
connection will compensate
for a maximum voltage drop
of 300mV on power feeds.
Sense connections can
be enabled and disabled
under software control and
include sense of remote
ground.
Load Ripple: <<1mV measured from 10Hz
to 100kHz
Power Source From the PXI chassis or
from an external supply,
software selectable.
External power source is
-12V min for full output
voltage range. Voltage can
be raised to -25V without
damage but may limit
available output current.
Protection: Short circuit protection.
Thermal protection. Chassis
-12V supply is protected by
an active current limiter.
Protected from accidental
application of reverse
voltages to 25V.
Power Requirements
+3.3V +5V +12V -12V
0 0.15A 0.05A Up to 1A
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
PXI & CompactPCI Compliance
The module is compliant with the PXI Specification
2.2. Local Bus, Trigger Bus and Star Trigger are not
implemented.
Uses a 33MHz 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.*
Mechanical Characteristics
Single slot 3U PXI (CompactPCI card).
3D models for all versions in a variety of popular file
formats are available on request.
Connectors
PXI bus via 32-bit P1/J1 backplane connector.
Power supply outputs via front panel 25-pin male D-type
connector, for pin outs please refer to the operating
manual.
Monitor: Built in Pickering Interfaces
Monitor allows the use of an
external DMM to measure
voltage and current. Voltage
measurement accuracy is
as the DMM ±30µV. Load
current is measured across
a sense resistor. Accuracy
is 1% ±0.3mA. Accuracy can
be improved by using sense
resistor calibration
Leakage Monitor: Allows the measurement of
leakage current. Maximum
current is 10µA. Accuracy
±2% ±3nA
Load Regulation: Recovers in 20µs from a load
current change of
1 Amp (full load).
On/Off Control: Separate from voltage setting
control. 20µs rise and fall
time (no additional capacitive
load, load current 1A).

SECTION 1 - TECHNICAL SPECIFICATION
Page 1.7
pickering
PROGRAMMABLE POWER SUPPLY MODULE 41-735/736
Dual -10V Power Supply, 41-736
pickeringtest.com
Ordering Information
Mating Connectors & Cabling
For connection accessories for the 41-736 module please
refer to the 90-008D 25-pin D-type Connector Accessories
data sheet where a complete list and documentation
can be found for accessories, or refer to the Connection
Solutions catalog.
Product Order Codes
Dual Programmable -10V Power Supply 41-736-001
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.
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 1.8
SECTION 1 - TECHNICAL SPECIFICATION
PROGRAMMABLE POWER SUPPLY MODULE 41-735/736
pickering
Dual -10V Power Supply, 41-736
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

SECTION 2 - TECHNICAL DESCRIPTION
Page 2.9
pickering
PROGRAMMABLE POWER SUPPLY MODULE 41-735/736
Dual -10V Power Supply, 41-736
pickeringtest.com
Supporting Products & Software
© Copyright (2022) 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 2.10
SECTION 2 - TECHNICAL DESCRIPTION pickering
PROGRAMMABLE POWER SUPPLY MODULE 41-735/736
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SECTION 2 - TECHNICAL DESCRIPTION
Page 2.1
pickering
PROGRAMMABLE POWER SUPPLY MODULE 41-735/736
SECTION 2 - TECHNICAL DESCRIPTION
FUNCTIONAL DESCRIPTION
A functional block diagram is provided in Figure 2.1.
The 41-735/736 Programmable Power Supply Module is a non-isolated power supply using linear regulators, which
are powered via the PXI chassis +12 V supply. For applications where the current drawn exceeds 1 Amp the power
supply can draw power from an alternative external power supply connected to the front panel connector. When
using the +12 V chassis supply the current drawn is continuously monitored. If it exceeds 1 Amp the power supplies
are closed down by voltage limiting and the close down is reported back over the PXI interface.
Two identical power supplies, which can be independently controlled, are available in each module.
The output voltage from the power supply can be programmed from 0V to 10V with a 16 bit control word.
Each power supply can be turned off.
The requested voltage levels are provided on a front panel D-type connector. Each power supply includes sense
lines for the positive output and for the ground connection. If the sense lines are connected to a remote load the
power supply will regulate the voltage at the remote point. If the voltage drop in the connection between the front
panel and the load is excessive it may limit the ability of the power supply to provide the requested output voltage,
particularly for the highest requested voltages.
A monitor port allows a user to measure various voltages that indicate load voltage, output voltage and output
current (by measuring the voltage drop across a sense resistor) using a standard DMM. The DMM requirements are
very modest since it only needs to measure voltages between 0V and 12V. The monitor port uses a MUX system
based on instrument grade reed relays to access the monitor points. Using a DMM concentrates the principal
calibration requirements on a single measuring device, making calibration easier and more cost effective.
The monitor port connections include source resistors. If the monitor port is used with a device (such as a data
acquisition system) with low input impedance the source impedance of the monitor port may need to be taken into
account to correct for absolute reading errors. The typical source impedance of the monitor port is 20Ω.
The monitor port has a through path that allows multiple power supplies to be daisy-chained, again allowing a single
DMM to measure a number of power supplies through a common set of terminals.
In an alternative mode of operation the power supplies allow the measurement of low leakage currents into the
device under test. This is accomplished by increasing the value of the sense resistor used by the DMM to measure
output current. This is useful for measuring the standby current of the DUT.

Page 2.2
SECTION 2 - TECHNICAL DESCRIPTION pickering
PROGRAMMABLE POWER SUPPLY MODULE 41-735/736
External
+12 Vdc Input
Cascade Access
(Monitor Output)
DMM Access
(Monitor Input)
+V Out
+V Sense
Vgnd Sense
GND
Access MUX
Programmable
Power Supply
Adj
Current
Limiter
Current
Monitor
Leakage
Monitor
DAC
ON/OFF
Control
+12V PXI
PXI BackplanePXI Backplane
Figure 2.1 - Functional Block Diagram
Low Voltage, High Current Operation
The 41-735/736 module uses a linear regulator which dissipates more heat as the load current is increased, the
output voltage is reduced and the input supply voltage is increased. At high ambient temperatures the maximum
current that can be delivered may be limited by the thermal protection circuit included in the regulator system.
The maximum operating temperature of the regulator junction is 125ºC and the thermal resistance from the junction
to ambient temperature is 9ºC/Watt.
At an ambient temperature of 25ºC the power supply can continuously deliver 1 Amp at 1 Volt out.
At an ambient temperature of 50ºC the increased temperature restricts the maximum power dissipation to 6.75
Watts (125ºC - 50ºC)*9ºC/Watt). If the supply is operating from the +12V PXI chassis supply the 1A maximum
current can be delivered for output voltages above 5.25V.
The output current capability at low output voltages and high ambient temperatures can be improved if an external
voltage source lower than +12V PXI chassis supply is used to provide the DC power, but this will limit the maximum
voltage that can be supplied.
The current limitation is imposed only by thermal considerations. The power supply can be loaded with pulsed
(intermittent) currents up 1A without the thermal protection operating.
When operating from the PXI chassis supply the net current to the two channels is limited to 1 Amp. If the load
current is increased further, a monitoring circuit will close down the power supply to ensure the PXI backplane
connector is not overloaded. If the monitor circuit closes down the supply the supply should be turned off, the fault
cleared and then normal operation can resume. The monitoring circuit is not used if the 41-735/736 module has DC
power supplied from an external source.
Irrespective of whether protection is by a thermal shutdown or by the monitoring circuit, activating the protection
mechanism is non destructive. If the thermal shutdown is activated time should be allowed for the heatsink
temperature to decrease after the fault is cleared so that normal operation can resume.

SECTION 2 - TECHNICAL DESCRIPTION
Page 2.3
pickering
PROGRAMMABLE POWER SUPPLY MODULE 41-735/736
CASCADING MONITOR PORTS
The monitor port on the 41-735/736 module provides an accurate method of checking the output voltages and
currents being supplied to the load using a single DMM. The DMM is set to measure voltage, where current is
to be measured it is sensed as a voltage across a series sense resistor. The DMM should not be used in current
measurement mode.
Using a DMM on the monitor port reduces system dependency on the intrinsic accuracy of the 41-735/736 module
and transferring the calibration burden to a DMM that is likely to be part of most test systems. Some applications
may require more than one 41-735/736 to be supported, or to allow other modules with similar monitor ports to be
connected.
Modules can be cascaded by simply using the cascade Monitor connections as shown.
For each module, the Monitor Port can be set to be either connected to that module, or the DMM input can be
passed on to the next module via the Cascade Monitor port. The software and hardware will disconnect the monitor
points from the DMM if it is set to direct the input to the Cascade Monitor, in order to ensure electrical isolation
between modules.
It should be noted that the wire size used is of little importance since the DMM input impedance is high and little
current ows. The user may need to consider screening the wires if there is risk of excessive voltage pick up on the
wiring of long chains of modules connected to the monitor port.
V+
V-
+- +- +- +- +-
DMM
Monitor Cascade
Monitor
Monitor Cascade
Monitor
Monitor Cascade
Monitor
41-735 41-735 41-735
Monitor ports are on pins 23 (+) and 10 (-) of the Front Panel D-Type Connector
Cascade Monitors are on pins 24 (+) and 11 (-) of the Front Panel D-Type Connector
Access to the monitor function is provided on two connectors. The rst connector is the D-type connector that
also carries the connections from the power supply. An optional connector block can be purchased to provide a
convenient way of wiring the both the monitor port and the power supply connections.
The monitor is also accessible on a separate pair of connectors at the top right of the module. This connection
method provides a simple way of daisy chaining modules together, whether they are 41-735/736 modules or other
modules that have the Pickering Interfaces Monitor facility. Using optional cables with push t connectors, modules
can be linked together so that a DMM can access any of the modules in the chain can be simply accessed from a
single pair of connections.
Figure 2.3 - Cascading Monitor Ports

Page 2.4
SECTION 2 - TECHNICAL DESCRIPTION pickering
PROGRAMMABLE POWER SUPPLY MODULE 41-735/736
The monitor connections on the D-type connector and the Pickering Interfaces Monitor (PIM) ports are wired
together. The D-type connector offers the advantage of using a screw lock connectors, the PIM port is simpler for
the user to connect modules together since it does not require a user to wire to a connector.
The monitor port can be set to a cascade path where the input (from the DMM) is looped directly to the output
(cascade) with no connection to internal parts of the 41-735/736, allowing modules to be connected in series.
2 2 2
V +
V -
DMM
PIM In PIM In PIM In
PIM Out PIM Out PIM Out
Figure 2.4 - Cascading PIM Monitor Ports