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SMU4201
Instruction Manual
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Aim-TTi SMU4001, SMU4201 Instruction Manual

INSTRUCTION MANUAL
EN
SMU4000 SERIES
SOURCE MEASURE UNITS

CONTENTS

CONTENTS ............................................................................................................................................................ 1
Product description ..................................................................................................................................... 4
Safety ............................................................................................................................................................. 5
Installation .................................................................................................................................................... 7
Instrument overview .................................................................................................................................... 10
Introduction .................................................................................................................................................. 14
Getting Started ............................................................................................................................................. 19
CONTENTS
Easy setup .................................................................................................................................................... 41
Manual setup ................................................................................................................................................ 42
Digital I/O ....................................................................................................................................................... 77
Math Functions ......................................................................................................................................... 79
Result sorting ........................................................................................................................................... 80
Application notes ..................................................................................................................................... 81
2 SMU4000 Series Instruction Manual
CONTENTS
System management ............................................................................................................................... 84
Maintenance .............................................................................................................................................. 88
Remote interfaces .................................................................................................................................... 89
Calibration ................................................................................................................................................. 90
Factory Default settings .......................................................................................................................... 91
Specification ............................................................................................................................................. 93
3 SMU4000 Series Instruction Manual
1 - Product description

PRODUCT DESCRIPTION

e SMU4000 (Source Measure Unit) Series provides class leading performance at a new and
Th affordable price point for a four quadrant SMU. Combining touch screen technology with an intuitive graphical user interface provides a clear and natural flow through the test and measurement process.
Integrating a fast and agile, high power four quadrant voltage/ current source and advanced precise voltage/ current meters in a compact half rack 2U casing, capable of precisely supplying positive and negative voltages, sourcing or sinking power, while simultaneously measuring both current and voltage for I-V characterising.
With high current and power combined with fast measurements and low glitch auto ranging speed, it is the ideal solution for industrial development as well as educational environments, identifying the SMU as the all-in-one solution for simplifying test applications such as battery charging/discharging, I-V characterising, semiconductor testing and much more.
4 SMU4000 Series Instruction Manual
2 - Safety
Caution, possibility of electric shock
UKCA ‘UK Conformity Assessed’ marking is a certification mark that affirms conformity with the applicable requirements for products sold within Great Britain.
Caution, possibility of
Earth (ground) terminal
‘CE’ marking is a certification mark that affirms the good's conformity with European health, safety, and environmental protection standards.
Protective Earth terminal
Standby supply. Instrument is not disconnected from AC mains power when switch is off.
WEEE (do not dispose in household waste) Alternating current.

Symbols

SAFETY

WARNING
Symbols
This document provides safety information and warnings which must be followed by the user to ensure safe operation of the SMU4001 and SMU4201 and to keep the instrument in a safe condition. The Source Measure Units described in this document are designed to be used as general purpose test and measurement equipment Category II or higher mains circuits (as defined in IEC 60364)
User manuals, additional support and service information can be found at: www.aimtti.com/support
The following symbols are displayed on the instrument and throughout the manual, to ensure the safety of the user and the instrument, all information must be read before proceeding.
. Must not be used for measurements of
CAUTION
NOTE
EXAMPLE
Indicates a hazard that, if not avoided, could result in injury or death.
Indicates a hazard that could damage the product that may result in loss of important data or invalidation of the warranty.
Indicates a helpful tip.
Indicates an example to show further details.
damage
5 SMU4000 Series Instruction Manual
2 - Safety

Safety notices

WARNING
Safety notices
This instrument is:
· A safety Class I instrument according to IEC classification and has been designed to meet the requirements of EN61010-1 and EN61010-2-030 (Safety Requirements for Electrical Equipment for Measurement, Control and Laboratory Use).
· An Installation Category II instrument intended for operation from a normal single-phase supply.
· Supplied in a safe condition and tested in accordance with EN61010-1.
· Designed for indoor use in a Pollution Degree 2 environment in the
temperature range 5°C to 40°C, 20% - 80% RH (non-condensing) and less than 2000m altitude.
Do not operate while condensation is present.
Do not operate outside its rated supply voltages or environmental range.
THIS INSTRUMENT MUST BE EARTHED.
Any interruption of the mains earth connector, inside or outside, will make the instrument dangerous. Intentional interruption is prohibited.
Use of this instrument in a manner not specified by these instructions may impair the safety protection provided
If any adjustment or repair of the opened power supply under voltage is inevitable it shall be carried out only by a skilled person who is trained to perform such adjustments and is aware of the hazards involved.
When connected, terminals may be live and opening the covers or removal of parts (except those that can be accessed by hand) may expose live parts.
To avoid electric shock, or damage to the instrument, never allow water to get inside the case.
If the instrument is clearly defective, has been subject to mechanical damage, excessive moisture, or chemical corrosion the safety protection may be impaired and it must be withdrawn from use and returned for checking and repair.
Voltages above 60VDC are hazardous live according to EN 61010-1 and great care must be taken when using the SMU at voltages above this level.
Capacitors inside the SMU may still be charged even if it has been disconnected from all voltage sources, these will be safely discharged a few minutes after switching off. LEDs on the HV rail to indicate that charge is still present, as such it’s not safe to dismantle until all LEDs have gone out.
This instrument is protected by three internal fuses which are user serviceable (refer to the Service Manual).
CAUTION
6 SMU4000 Series Instruction Manual
Do not wet when cleaning, use only a soft dry cloth to clean the screen.
Do not use sharp or pointed objects to operate the touch screen.
Take care not to restrict the inlet vents at the front, rear, sides or underneath the instrument. In rack-mounted situations, allow adequate space around the instrument.
3 - Installation

Mounting

INSTALLATION

Mounting
This instrument is suitable both for bench use and rack mounting.
For rack mounting the protective bezels and handle/stand should be removed such that the instrument can be fitted beside any other standard 2U half-rack instrument in a 19” rack. A suitable 2U 19” rack kit is available from the manufacturers or their overseas agents.
See rack mount instructions for details on how to remove the protective bezel and handle.

Ventilation

The instrument uses a fan fitted to the rear panel. Take care not to restrict the rear air exit or the inlet vents at the front (sides and underneath). In rack-mounted situations allow adequate space around the instrument and/or use a fan tray for forced cooling. If the air inlet vents are restricted for any reason, the fan can be set to ‘fast’ to compensate for minimal restrictions, see ‘Air vents’ for more details.

Handle/stand

The instrument is fitted with a 4-position handle/stand. Pull out both sides of the handle at the case pivot points to free the position locking pegs and rotate the handle from the stowed position to the required stand or handle position. Release the sides of the handle to lock it in the new position.
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3 - Installation
A switch is located in the highlighted postiton (SW1).

Electrical Requirements

Electrical Requirements
Mains operating voltage
CAUTION
The operating voltage is switch selectable between 115Vac or 230Vac. You must check that the local supply meets the AC input printed on the rear panel before connecting the unit to the supply.
Changing the mains operating voltage
Should it be necessary to change the operating voltage from 230V to 115V or vice-versa, follow the instructions below:
WARNING
The apparatus must be disconnected from all voltage sources before it is opened for any adjustment. Capacitors inside the SMU may still be charged even if it has been disconnected from all voltage sources, these will be safely discharged a few minutes after switching off. LEDs on the HV rail to indicate that charge is still present, as such it’s not safe to dismantle until all LEDs have gone out.
Remove the case:
① Position the handle as shown.
③ Slide and lift the case clear.
Mains supply voltage selection:
Select the required value with the switch and replace the case.
CAUTION
② Remove 2x screws from the rear panel.
The set AC input voltage MUST be clearly labeled on the rear panel.
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3 - Installation

Switching On

Mains lead
Connect the instrument to the AC supply using the mains lead provided.
Should a mains plug be required for a different mains outlet socket, a suitably rated and approved 3 core mains lead with protective earth conductor should be used which is fitted with the required wall plug and an IEC60320 C13 connector for the instrument end.
The minimum current rating of the lead-set for the intended AC supply is 6A or more.
WARNING
THIS INSTRUMENT MUST BE EARTHED.
Any interruption of the mains earth conductor inside or outside the instrument will make the instrument dangerous. Intentional interruption is prohibited.
Before use, inspect provided mains lead for any signs of damage. Do not use if lead is damaged.
Before use, inspect the instrument for any signs of damage. Do not use if damaged.
WARNING
Switching On
Connect the instrument to the AC supply using the mains lead provided.
Press the standby button; the button will illuminate to indicate start up. At power-up the instrument will display a start-up message whilst initialising the application.
Loading takes a short while as the SMU will carry out self-testing and a self-calibration (at every power cycle), after which the home screen is displayed.
To sw itch off, press the standby button. When powered down into standby mode the LED is dimly lit, indicating mains power is still present.
To fully disconnect from the AC supply, unplug the mains cord from the back of the instrument or switch off at the AC supply outlet; make sure that the means of disconnection is readily accessible. Disconnect from the AC supply when not in use.
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4 - Instrument overview
②
⑧

Front Panel

INSTRUMENT OVERVIEW

CAUTION
Front Panel
④
⑤
⑥
③
⑩ ⑦
⑨
①
① Standby button
When pressed to power up the instrument, the button will illuminate to indicate start up.
When powered down into standby mode, mains power is still present.
Alternative power up options are available, see ‘Power Control’ for more details.
② Remote Indicator LEDs
When the instrument is being controlled remotely, the remote indicator will be illuminated, either the LAN, USB or GPIB indicator will also be illuminated, depending on the communication type.
③ Flash Drive
This is a USB Host port for the connection of flash drives which conform to the Mass Storage Class specification and are formatted as FAT3 2.
Setups, sequences, and lists can be imported and exported via the flash drive port, see ‘Storing and Loading Setup Files’ for more details.
Measurement data can be automatically recorded to the flash drive on completion of a test run, see ‘Saving Data’ for more details.
Images of the display can be captured and exported using the flash drive port see ‘Icons/ indicators on the status bar’ for more details
④ Rotary Knob
The rotary knob is used to navigate the user interface and scroll through values - it features a ‘press’ function to select an option, see ‘
Basic operation’ for more details.
⑤ Menu Keys
- HOME - Returns to the home screen, see ‘Home screen’ for more details.
- CNFG- Accesses the main menu configuration screen
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4 - Instrument overview
Front Panel
⑥ Run Key
The Run key enables the output and executes the present configuration.
⑦ Test Key
The Test key performs a quick internal self-calibration and measurement zero. See ‘Zero Calibration’ for more details.
⑧ Help Key
The context sensitive help key provides direct assistance with menus, settings, and parameters.
⑨ Terminals
The front input terminals are 4mm safety sockets on a 19mm pitch designed to accept 4mm safety plugs with fixed or retractable shrouds.
WARNING
CAUTION
Only ever use either the front or rear terminals, never use both at once. Hazardous voltages will appear on both sets of terminals.
SMU4201 Front and Rear Terminal Blocks, Main/ Force(F), Sense(S) and Guard(G) can be set and operate at voltages up to 210Vpeak. Voltages greater than 60V are deemed hazardous
voltages.
Only use test leads conforming to IEC61010-031. Always make connections to the instrument with the OUTPUT off and in the Open off state;
this is the only output state that completely isolates the external circuitry from the instrument.
All terminals are rated to 300Vpeak with respect to earth ground. Safety will be maintained if voltages up to 21Vpeak for SMU4001 or 210Vpeak for SMU4201, are accidentally applied between inappropriate terminals in excess of their marked ratings. The maximum differential between MAIN HI and SENSE HI and MAIN LO and SENSE LO should be < 2Vpeak. The SENSE terminals are protected against accidental connection of up to 21Vpeak for SMU4001 or 210Vpeak for SMU4201 between HI & LO.
Main- Main Terminals source or sink voltage or current.
Sense- Sense terminals measure voltage. The HI Sense terminal can be used as a guard in 2 Wire + Guard setups. 4 Wire setups use the HI & LO Sense plus the HI & LO Main terminals.
Ground- chassis ground for ground reference purposes only. See ‘Terminal selection’ for more details.
⑩ CV / CC LED indicator
When the output is running, the CV/ CC indicators show whether the instrument is in Constant Voltage or Constant Current.
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4 - Instrument overview
②
③

Rear Panel

Rear Panel
④
WARNING
①
⑤ ⑥
⑦ ⑧
① Terminal Block
The terminal block provides rear access to the Main and Sense connections with the addition of Guard connections.
To connect a wire, press the orange actuators of the screwless terminals, insert the connecting wire and release the actuator to secure the connection.
Use insulated wire (solid or stranded, 0.5mm2 to 1.5mm2 (21 to 16AWG), strip length 9mm to 10mm) suitable to meet local safety standard for 300Vpeak, i.e. tri-rated 600V equipment wire with uninsulated ferrule. Ensure there are no loose strands.
Only ever use either the front or rear terminals, never use both at once. Hazardous voltages will appear on both sets of terminals.
CAUTION
SMU4201 Front and Rear Terminal Blocks, Main/ Force(F), Sense(S) and Guard(G) can be set and operate at voltages up to 210Vpeak Voltages greater than 60V are deemed hazardous
voltages.
Only use test leads conforming to IEC61010-031. Always make connections to the instrument with the OUTPUT off and in the Open off state;
this is the only output state that completely isolates the external circuitry from the instrument.
All terminals are rated to 300Vpeak with respect to earth ground. Safety will be maintained if voltages up to 21Vpeak for SMU4001 or 210Vpeak for SMU4201, are accidentally applied between inappropriate terminals in excess of their marked ratings. The maximum differential between FORCE HI and SENSE HI and FORCE LO and SENSE LO should be < 2Vpeak. The SENSE terminals are protected against accidental connection of up to 21Vpeak for SMU4001 or 210Vpeak for SMU4201 between HI & LO.
F +/- [Force] - Force terminals source or sink voltage or current, they are permanently wired in parallel with the front panel Main HI and LO terminals.
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4 - Instrument overview
Rear Panel
S +/- [Sense]- Sense terminals measure voltage and are permanently wired in parallel with the front panel SENSE HI and LO terminals. 4 Wire setups use the HI & LO Sense plus the HI & LO FORCE terminals.
WARNING
G [Guard] terminals
Dedicated Guard terminals only feature on the rear panel.
The Guard signal driven to the same potential as the FORCE HI. As such, if the FORCE HI is at a hazardous voltage, the same hazardous voltage level will also be present at the Guard.
See ‘Terminal selection’ for more details.
② AC power inlet
The instrument must be connected to AC mains using the power lead provided. When the power lead is connected this lead provides the necessary protective earth connection to an external protective earth system. See ‘Electrical Requirements’ for more details.
③GPIB (optional)
For GPIB connection the SMU Requires a GPIB 1A user retrofittable option, available from the manufacturers or their agents. The default GPIB address is 10. See ‘Remote interfaces’ for more details.
④ USB
The USB device port accepts a standard USB cable. The Windows plug-and-play functions should automatically recognise that the instrument has been connected. See ‘Remote interfaces’ for more details.
⑤ K Lock
The Kensington slot is a standard slot that can be paired with a security cable lock.
⑥ LAN
The LAN interface is designed to meet 1.5 LXI (LAN extensions for Instrumentation) Core
2016.Remote control using the LAN interface is possible using a TCP/IP Socket protocol. See ‘Remote interfaces’ for more details.
⑦ Chassis earth M4
The M4 threaded screw marked provides a connection point to safety earth ground. An M4 Ring tab must be used, with an appropriate washer.
⑧ Digital I/O [DIO]
The DIO is an input/output port that receives, and outputs signals through digital I/O lines. See ‘Digital I/O’ for more details.
+5.25Vpk Max. (diode clamped to +5V). The 5V supply is internally fused (resettable fuse) to 500mA, see the SMU4000 Series Service Manual for more information.
13 SMU4000 Series Instruction Manual
5 - Introduction

Using this Manual

INTRODUCTION

Using this Manual
This manual is a general introduction to the organisation of the instrument and is intended to be read before using the instrument for the first time.
In this manual:
The descriptions in this manual relate to using the instrument via the touch screen, alternatively; the hard keys and rotary knob can be used. See Navigation Controls for details on how to use the rotary knob to control the instrument.
Throughout this manual, the navigation through menus will be shown at the top of a section using the following format: MENU>Sub Menu>Option
· Front panel keys and sockets are shown in capitals, e.g., HOME, CNFG;
· Text, entry fields and messages displayed on the LCD are shown in a different
font, e.g., Source, Limit, Results.
· Hyperlinks are shown in italics, e.g., ‘Using this Manual’
Other Manuals are available to download for this product series including:
· Safety Documentation and Quick Start Guide [English, French, German, Italian & Spanish]
· Programming Manual [English]
· Service Guide [English] available on request.
Available from www.aimtti.com/support.
14 SMU4000 Series Instruction Manual
5 - Introduction

Navigation Controls

Navigation Controls
Hard Keys
There are two main menus: HOME and CNFG (configuration)- These are accessed using the hard keys on the front panel. The items within these menus can be selected using the following options:
· Touch Screen Direct selection and entry using touch. Simply touch the item with your finger to select.
· Rotary Knob Turn the knob clockwise to initiate, once the desired button has been selected, press to engage the button. The knob can also be used to modify home screen parameters once they have been selected.
Menu Scrolling
Some menus contain more than one page of options, when this is the case, arrows ① are available to scroll the page up or down.
OK / Cancel
The OK and Cancel ② keys are available on all screens where changes can be made; pressing OK will apply any changes and return the previous menu., Cancel will return to the previous
screen without making any changes.
②
①
Back Button
The Back button is available on sub menus, when pressed it will return to the previous menu.
15 SMU4000 Series Instruction Manual
5 - Introduction
①
② ③ ④
Navigation Controls
Numeric Keypad / Keyboard Pop-up
Depending on where the keypad pop-up appears, the following options will be available to select from on the keypad.
① Non-numeric Options:
Auto / Disabled etc.
② Numeric Selection
Numeric selection is 0-9, decimal point and minus sign (if negative values can be entered)
③ Unit Selection ④ Actions:
Bksp- Remove the previous number.
Revert- Revert the value back to the original; before the value was amended with the keypad.
Rev Pol- Available when a positive or negative value is to be accepted, toggles between plus
and minus symbol.
A full QWERTY keyboard is available for text entry.
16 SMU4000 Series Instruction Manual
5 - Introduction

Home screen

Home screen
①
②
③
① Status bar
• USB flash drive status (connected/disconnected) and touch to capture screen image, if connected.
④
• Logged Event; a Warning, Caution or Information pop up has occurred and been logged. Touch to see the Event Log.
• LAN Status. Touch to edit in the Interfaces menu.
• Present Mode and selected shape (if other than steady), Output status, terminal
configuration and selected OFF state. See ‘Icons’ for more details. Touch to edit in the Manual Setup menu.
• Operating voltage limit [SMU4201 only]. LV (low voltage mode) for up to ±42V working mode, HV (high voltage mode) for up to ±210V working mode. Touch to change between LV and HV. By default, the unit is locked into LV mode and password protected, see ‘Password protection’ for more details.
• Date and time, touch to edit, see ‘Date and Time’ for more details.
② Source and Limits
User defined source/sink level and imposed limits, depending upon the selected mode. Values can be modified by direct touch keypad entry, simply press on the relevant parameter to bring up the numeric entry screen. Alternatively, the selected values can be modified by using the rotary knob.
③ Results
Results box contains the real time measurements and, if enabled, the measurement reference and math formula applied to the readings. When in Sequence mode the active step and operating mode will be shown.
④ Buttons:
See ‘Measurement selection, ’Selecting a Range’, ‘Graph view Menu’ or ‘Sample table’ for more information.
17 SMU4000 Series Instruction Manual
5 - Introduction
Icon
Variations
Description
Not Connected
Reading
USB Connected, Press to capture screen image
USB not supported.
③ Event log
LAN
LAN detected
↑↓
Data Transfer detected
LAN IP Error
LAN IP Address Error
Press to edit the setup.
SV
Source Voltage
SC
Source Current
LC
Load Current
LR
Load Resistance
LP
Load Power
MV
Measure Voltage
MC
Measure Current
MR
Measure Resistance- Voltage Limited
MHR
Measure Resistance- Current Limited
SEQ
Sequence Mode
Note: If Sequence Mode is running it will show the Active Mode in the step.
OFF
Output Off
ON
Output On
CC
Output On - Constant Current
CV
Output On - Constant Voltage
CMV
Output On- Constant Maximum Voltage
2 Wire
Main terminals- Source and Sense
2W+Guard
Main terminals- Source and Sense. HI Sense terminal - Guard
4 Wire
Main terminals- Source and Sense. Sense Terminals- Sense
0V/100µA
Source 0V/ 100uA current limit
Hi Z
Terminals are high impedance
Zero
Source 0V
Open
Terminals are open circuit
Steady
Source is steady
Pulse
Source is pulsed between two levels
Sweep
Source is swept in steps between start and end levels
List
Source is defined by a custom list of levels
Pulsed sweep
Source is swept in pulsed steps between start and end levels.
⑤
Press to activate/deactivate the High Voltage Interlock. Note: To access the High Voltage
*SMU4201
LV
Low Voltage Mode
HV
High Voltage Mode.
⑥Time and Date
①
④
②
③
⑤
⑥
Home screen
Icons/ indicators on the status bar
The following icons or indicators may appear on the status bar.
① USB Flash Drive
② LAN status
④ Setup Status
Active Mode
Output status
Event logged, Press to see logged event/s
Press to edit Interface setup
Terminal configuration
Off State (Output Off)
Shape (Output On, in place of Off State)
Operating Voltage Limit *
Interlock, the password protection may need to be removed first.
only.
Press to edit Time and Date
18 SMU4000 Series Instruction Manual
6 - Getting Started

Connections

GETTING STARTED

Connections
Connections can be made to the front or rear terminals on the instrument. The front and rear terminals are connected in parallel and must never be used simultaneously.
Front/Rear connections
Front and rear terminals are always active, there is no need to select between the two.
The terminals on the front panel are 4mm banana jack connectors, and the rear-panel contains a terminal block. The rear terminals offer additional Guard connections for screening, see ‘Terminal selection’ for more details.
Front panel Main HI and LO terminals are permanently wired in parallel with the rear panel F +/­[Force] terminals.
Front panel SENSE HI and LO terminals are permanently wired in parallel with the rear panel S +/- [Sense] terminals
WARNING
Only ever use either the front or rear terminals, never use both at once. Hazardous voltages will appear on both sets of terminals.
Hazardous voltages will appear on both sets of terminals. Always make connections to the instrument with the OUTPUT off and in the Open off state;
this is the only output state that completely isolates the external circuitry from the instrument.
19 SMU4000 Series Instruction Manual
6 - Getting Started

High Voltage Interlock [SMU4201 only]

High Voltage Interlock [SMU4201 only]
The instrument contains a high voltage interlock to prevent accidental access to potentially dangerous high voltages.
By default, the instrument is set to Low Voltage operation, restricting the maximum permitted voltage to ±42V DC. Source level and limit settings are restricted to a maximum of ±42V DC. If for whatever reason this voltage limit is exceeded whilst the output is running, the output will either continue to run and limit the voltage to the maximum of ±42V DC (Limited), or the output will trip to the OPEN off state condition (Trip). This feature can be set in the Interlock Behaviour menu:
CNFG > [System] Manage > [Security] Interlock Behaviour.
The status of the interlock is shown in the form of a HV/LV icon on the status bar of the user interface home screen and can also be queried remo tely.
There are three ways in which the interlock state can be changed between Low voltage operation and full voltage operation:
1. Password Protection: A password entry is required to enable full voltage operation. See
‘
Password protection’. Once the password is entered correctly the interlock status can be
changed by touching the LV symbol on the status bar of the home screen.
WARNING
2. External DIO control: This allows for the controlling of the interlock via external circuitry. This is primarily designed for helping to ensure the safe operation and safety of users of the equipment when embedded into a test system or test fixture. For safety reasons, test fixtures that may contain hazardous voltages often utilize a safety cover, a form of lid or even complete doors to protect the user from hazardous voltage exposure. Installing a switch on any of these and linking to the external DIO interlock control allows for the limiting of hazardous voltages (Low voltage operation) whenever the switch is opened. For more information on the DIO interlock control see ‘
Digital I/O’.
3. Remote interface control: The state of the interlock can be controlled directly without password protection. The status of the interlock can also be queried remotel y. See the SMU4000 Series Programming Manual for more information.
Enabling full voltage operation (asserting the interlock) could expose the user to potentially hazardous voltages that could result in injury or death.
Potentially hazardous voltages of up to ±210 V may be present at the MAIN HI, F+/-, Sense HI, S+/- and Guard terminals.
These terminals should be considered hazardous even if set to a non-hazardous voltage or current level.
NOTE
Whenever the interlock setting is changed via the front panel or remote command, the output is disabled for safety purposes.
20 SMU4000 Series Instruction Manual
6 - Getting Started

Basic operation

Basic operation
Sourcing voltage and recording measurements
When set to default settings, the source voltage configuration settings will be loaded. To set the source level:
· Touch the source setting.
· Enter the required value and press OK.
· Press the RUN hard key to activate the output.
The default measurement count is infinite; therefore, measurements will be recorded up to the maximum amount of 100,000. Once reached, the output will remain on but measurements will no longer be recorded.
The default measurement period is 1 PLC. One Power Line Cycle (PLC) for 50Hz is 20ms and one PLC for 60Hz is 16.67ms. Mains input frequency is automatically monitored and applied by the instrument.
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6 - Getting Started
Basic operation
Live adjusting source and limits from the home screen
The source and limit parameters can be adjusted in real time using the rotary knob when the output is active. To adjust the source level in real time:
· Press the RUN hard key to activate the output.
· Highlight the source value using the rotary knob.
· Press the knob to enter the editing state, the knob will now scroll through the
source values.
NOTE
· Scrolling left and right will change the value resolution. Press again to edit the numeric value.
A green digit indicates the encoder is in an active state, any adjustments using the encoder are live and will be actioned at the terminals immediately (when the SMU is running).
· Double press the knob or press the HOME key to exit the live editing mode.
22 SMU4000 Series Instruction Manual
6 - Getting Started

Selecting a Range

Selecting a Range
HOME > Ranges
Before considering a range selection it is important to understand the concept of manual setup modes that are used in the SMU; see ‘Operating Mode’ for more details. Configuration settings, including the selected ranges, are linked to the selected mode of operation.
NOTE
Range selection is ‘Manual setup’ specific.
Ranges can be set for current and voltage, the available ranges are determined by the selected mode of operation.
A range can be set to Auto, or a manual value.
Most applications will require Auto Range, however if high accuracy or speed is required it may be necessary to select a manual range.
The automatic range selection determines and selects the most suitable ranges based upon the measured readings and source settings.
Timing considerations
Faster Response Speeds
Selecting a manual range can assist with faster response speed. Auto ranging changes the range whilst the output is running, this can lead to increased rise/measurement/settling times whilst the instrument selects the appropriate range; selecting a manual range overcomes this potential timing penalty.
NOTE
The fastest response speeds can only be achieved when a manual range is selected.
Reduced settling times
Settling times can be reduced when in auto range by selecting a minimum range value. This defines the minimum range that the instrument can select during auto-ranging. Setting this to the lowest range that is required for the given test/application may help to reduce the settling time, as the lower ranges have generally longer settling times.
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6 - Getting Started
Selecting a Range
In order to bypass this functionality, simply set the minimum range to the smallest range available.
To set the minimum range, press the Auto (Min.Range xxx) Button. Set the minimum required range and press Back to return to the Range Menu.
Stability Considerations
NOTE
NOTE
Auto ranging can, in some specific cases (where there may be a significantly highly reactive load) lead to potential instability or oscillations. If this occurs, selecting the appropriate manual ranges can alleviate the issue. When using the most sensitive current ranges i.e.200nA and 2µA ranges potentially instability could occur, in this case try a higher current range.
Limit considerations
The source and limit level settings cannot exceed 105% of the selected associated range. The limit setting is restricted to a minimum of 10% of the manually selected range.
If a lower manual range is selected that causes the existing source or limit level setting to exceed the selected range maximum, the associated level is set to 105% of the new range. Likewise, if a higher manual range is selected that causes the existing limit level setting to exceed the selected range maximum, the limit level is set to 10% of the new range.
In SC and MR modes (see ‘Operating Mode’ for more details) where the current source is utilized, the 3A range can only be accessed via manual range selection, the auto current range will stop at the 1A range.
Noise pickup, leakage and instability issues may arise when testing within certain manual ranges, see ‘Application notes’ for tips to overcome these issues.
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Measurement selection

Measurement selection
HOME > Measure
The measurement selection configures the primary and secondary measurements. The primary and secondary measurements can be set to measured voltage, measured current or the computed power or resistance.
Only the selected primary and secondary measurements appear on the home screen results section, within the sample table measurement buffer and within the measurement statistics menu.
The primary measurement is used for setting the live and custom measurement reference math operations (See ‘Math’), and defining the measurement that is displayed on the YT graphical view (See ‘Graph’).
NOTE
The exported .CSV files contain all four measurement types.
NOTE
Alternative primary and secondary measurement types can be selected after the test is complete. The selected measurement data can be viewed in the sample table or the YT graph (primary measurements).
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Saving Data

Saving Data
CNFG > [Files] Data Store
The buffer records all the information displayed in the sample table. Up to 100,000 points can be recorded at any time.
NOTE
The buffer data is cleared each time the output is run, ready for the next set of measurement data to be collected. The buffer data is also automatically cleared when the instrument is power cycled.
Buffered data can be saved as a .CSV file to a USB flash drive connected via the front panel, either manually or automatically.
The .CSV file will contain the following information:
· Index
· Active Mode
· Output state
· Measurement results (V and A)
· Calculated results (R and W)
· System Date
· System Time
· Measurement Timestamp
· Sequence Mode Step and Iteration
NOTE
To store all measurement data, the measurement buffer should be exported over remote or to an external flash drive after completion of each run (automatically).
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Saving Data
Save Data Automatically
To automatically save the data to USB after every run, press the Auto Store function. The file name will be highlighted with a green border and the data will be saved to the flash drive when the SMU has completed a run.
Save Data Manually
To manually save data, press the USB Store button. A .CSV file will be saved to the USB Flash drive each time the USB Store button is pressed.
Buffer status
The buffer status is displayed as a percentage within the Clear button, when pressed the data will be cleared and set to 0%.
View buffer data
Buffered Data can be viewed in three different formats from the front panel:
· Individually indexed measurements, see ‘Sample table’ for more details.
· Graphically plotted data, see ‘Graph’ for more details.
· Statistically, see ‘Measure Statistics’ for more details.
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Sample table

Sample table
CNFG > [Files] Sample Table
The Sample Table displays the contents of the buffered measurement data in a table format. The contents of the table include the index, primary measurement, secondary measurement, date, and time. Results are stored sequentially from the first index number and will be stored until the buffer limit is reached, at 100,000 measurements.
The time is recorded as HH:MM: SS.
The date is recorded as DD/MM/YYYY (Default), MM/DD/YYYY or YYYY/MM/DD, depending on the format selected, see ‘Date and Time’ for more details .
All exported data from the sample table to the .csv file will be formatted as YYYY/MM/DD.
The up and down arrow keys can be used to scroll through the results in the sample table. Using the touch screen, pressing, and holding the button will scroll through the results faster.
A single result can be selected and used as a reference point for a math function. To set the reference point, use the encoder to select the required primary measurement and press to activate. See ‘Math’ for more details.
NOTE
The sample table will only display the primary and secondary measurement data; however, the internal buffer contains all four measurements which can be exported or can be accessed via changing the primary and secondary measurements. Changing the primary and secondary measurements can be done live or even after the test is complete to access all four measurement data sets.
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Measurement Statistics

Measurement Statistics
CNFG > [Files] Measure Statistics
The measurement statistics menu provides statistical measurement information based upon the primary and secondary measurement data. With a large 100k measurement buffer it can be very difficult to pick out key information from the sample table alone. The measurement statistics menu provides details of:
· Minimum sample value
· Maximum sample value
· Total measurement span (min to max)
· Average (mean)
· Standard deviation of the measurements for both the primary and secondary
measurements.
The measurement statistical data is based on the data that is in the sample table and is updated accordingly, as new data is recorded.
NOTE
Changes to the primary and secondary measurements can be actioned live or even after the test is complete to access all four sets of measurement statical data (V, I, W & Ω).
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