AimTTi MX100T User manual

MX100T & MX100TP
Triple Output Multi-Range DC Power Supply INSTRUCTION MANUAL

Page 1
CONTENTS
1Product Description......................................................................................................4
2Safety.............................................................................................................................5
3Installation.....................................................................................................................6
3.1 Mains Operating Voltage..........................................................................................6
3.2 Mains Lead...............................................................................................................6
3.3 Mounting...................................................................................................................6
3.4 Ventilation.................................................................................................................6
4Connections ..................................................................................................................7
4.1 Front Panel Connections..........................................................................................7
4.2 Rear Panel Connections (MX100TP) .......................................................................7
4.3 Terminal Voltages and Safety...................................................................................7
4.4 Output Protection......................................................................................................7
5Initial Operation.............................................................................................................8
5.1 AC Power On/Off......................................................................................................8
5.2 DC Output On/Off.....................................................................................................8
6The Display and Soft Key Control ...............................................................................9
6.1 The Home Screen ....................................................................................................9
6.2 Individual Output Screens ........................................................................................9
6.3 Setting with the Keypad..........................................................................................10
6.4 Setting with the Spin Wheel....................................................................................10
6.4.1 Spin Wheel Action Options ...................................................................................10
7Power Supply Settings...............................................................................................11
7.1 CV and CC modes, Viewing Settings (Limits).........................................................11
7.2 Setting with Individual Output Screens...................................................................11
7.3 Power Display (VxA)...............................................................................................12
7.4 Selecting Current Meter Averaging.........................................................................12
7.5 Setting Over-Voltage and Over-Current protection.................................................12
7.6 Setting the Voltage/Current Range.........................................................................13
7.7 Store and Recall of Settings...................................................................................13
7.8 The System Menu Screen......................................................................................14
7.9Voltage Tracking.....................................................................................................14
7.10 Locking the Front Panel ......................................................................................14
8Display Symbols .........................................................................................................15
9Menu - Advanced Functions ......................................................................................16
9.1 Setting Voltage Tracking ........................................................................................16
9.2 Current Meter Averaging Setup..............................................................................17
9.3 Store and Recall of Settings for All Outputs ...........................................................17
9.4 Multi-On / Multi-Off Operation and Sequencing......................................................17
9.4.1 Emergency Off......................................................................................................18
9.5 Pass Code Locking of the Front Panel...................................................................18
9.6 System Preferences...............................................................................................19
9.7 Setting to Factory Defaults.....................................................................................19
9.8 Adjusting LCD Contrast..........................................................................................19
9.9 Calibration ..............................................................................................................19
9.10 Remote Control Interfaces (MX100TP only)........................................................19

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10 Changing System Preferences...............................................................................20
10.1 Status at Power-up..............................................................................................20
10.2 Alert Sound (Beep)..............................................................................................20
10.3 Spin Wheel Action...............................................................................................20
11 Notes on Operation..................................................................................................21
11.1 Accuracy and Resolution.....................................................................................21
11.2 Remote Sense ....................................................................................................21
11.3 Parallel Wiring of Outputs....................................................................................21
11.4 Series Wiring of Outputs .....................................................................................22
11.5 Instantaneous Current Output.............................................................................22
11.6 Output On/Off and Response Speed...................................................................22
11.7 Using OVP and OCP...........................................................................................23
11.7.1 OCP Trip at Output On .........................................................................................23
11.8 Over-temperature Trip (OTP)..............................................................................23
12 Remote Interface Operation (MX100TP only) ........................................................24
12.1 MX100TP Rear Panel Connections.....................................................................24
12.2 Remote Interface Configuration ..........................................................................24
12.2.1 GPIB Interface......................................................................................................25
12.2.2 RS232 Interface....................................................................................................25
12.2.3 USB Interface and Device Driver Installation ........................................................26
12.2.4 LAN Interface........................................................................................................26
12.2.5 LAN IP Address and Hostname............................................................................27
12.2.6 Interface Locking ..................................................................................................28
12.2.7 Status Reporting...................................................................................................29
13 Remote Commands (MX100TP only)......................................................................34
13.1 General ...............................................................................................................34
13.1.1 Remote and Local Operation................................................................................34
13.1.2 Remote Command Handling.................................................................................34
13.1.3 Remote Command Formats..................................................................................34
13.1.4 Command Timing..................................................................................................35
13.1.5 Response Formats................................................................................................35
13.2 Command List.....................................................................................................35
13.2.1 Instrument Function Commands...........................................................................35
13.2.2 Common Commands............................................................................................37
13.2.3 Status Commands ................................................................................................38
13.2.4 Interface Management Commands.......................................................................39
14 Maintenance.............................................................................................................40
14.1 Cleaning..............................................................................................................40
14.2 Fuse....................................................................................................................40
14.3 Calibration...........................................................................................................40
14.4 Firmware Update.................................................................................................40
15 Technical Specifications.........................................................................................41
16 Default Values..........................................................................................................44

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1Using this Manual
This manual includes cross references which are shown as follows - see section X.X.
Within a PDF file, the shaded number is a hyperlink to that section number which enables the
user to jump rapidly to the section referred to and then jump back to continue reading the
original section.
(N.B. for hyperlink navigation within Acrobat Reader, enable “show all page navigation tools” or
use the keyboard shortcuts Alt+Left-Arrow and Alt+Right-Arrow).
The Table of Contents is also fully hyperlinked and is replicated within the Bookmarks pane.
Note: The latest revisions of this manual, device drivers and software tools can be
downloaded from: http://www.aimtti.com/support.
This manual is 48511-1610 Issue 6

Page 4
2Product Description
The MX100T is a triple output laboratory power supply incorporating three outputs of similar
power and features.
Each output can provide 0 to 35 volts at 0 to 3 amps (105 watts) with range switching extending
its capabilities to provide voltages up to 70V and currents up to 6A. Twelve range combinations
are available as shown in the chart.
Mixed-mode regulation is used which combines switch-
mode power conversion with linear final regulation to give
good noise and transient performance.
All information is displayed on a large backlit graphic LCD
and control is via soft keys together with a numeric keypad
and spin wheel.
Advanced features include 50 settings memories for each
output plus 50 further memories that record the settings for
all three outputs together.
Multi-On and Multi-Off keys supplement the individual output
On/Off keys and can be programmed to turn the outputs on
or off in a timed sequence.
The front panel can be locked to prevent accidental changes
to settings.
The power supply is housed in a compact half-rack width, 3U high case with front input
ventilation. An intelligent fan is used to minimise cooling noise.
The MX100TP has the same manual control features and adds USB, RS232, GPIB and LXI
compliant LAN interfaces together with duplicate power and sense terminals at the rear.

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3Safety
This power supply is a Safety Class I instrument according to IEC classification and has been
designed to meet the requirements of EN61010-1 (Safety Requirements for Electrical Equipment for
Measurement, Control and Laboratory Use). It is an Installation Category II instrument intended for
operation from a normal single phase supply.
This instrument has been tested in accordance with EN61010-1 and has been supplied in a safe
condition. This instruction manual contains some information and warnings which have to be
followed by the user to ensure safe operation and to retain the instrument in a safe condition.
This instrument has been designed for indoor use in a Pollution Degree 2 environment in the
temperature range 5°C to 40°C, 20% - 80% RH (non-condensing). It may occasionally be subjected
to temperatures between +5°C and –10°C without degradation of its safety. Do not operate while
condensation is present.
Use of this instrument in a manner not specified by these instructions may impair the safety
protection provided. Do not operate the instrument outside its rated supply voltages or
environmental range. 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. The protective action must not be
negated by the use of an extension cord without a protective conductor.
When the instrument is connected to its supply, terminals may be live and opening the covers or
removal of parts (except those to which access can be gained by hand) is likely to expose live parts.
The apparatus shall be disconnected from all voltage sources before it is opened for any
adjustment, replacement, maintenance or repair. Capacitors inside the power supply may still be
charged even if the power supply has been disconnected from all voltage sources but will be safely
discharged about 10 minutes after switching off power.
Any adjustment, maintenance and repair of the opened instrument under voltage shall be avoided
as far as possible and, if inevitable, shall be carried out only by a skilled person who is aware of the
hazard involved.
If the instrument is clearly defective, has been subject to mechanical damage, excessive moisture or
chemical corrosion the safety protection may be impaired and the apparatus should be withdrawn
from use and returned for checking and repair.
Make sure that only fuses with the required rated current and of the specified type are used for
replacement. The use of makeshift fuses and the short-circuiting of fuse holders is prohibited.
Do not wet the instrument when cleaning it.
The following symbols are used on the instrument and in this manual:-
meaning Caution. In this manual this symbol is used to highlight situations where
incorrect use may either damage the instrument or cause a potential hazard to the
user.
Earth (ground) terminal.
mains supply OFF.
l
mains supply ON.
alternating current (ac)

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4Installation
4.1 Mains Operating Voltage
This instrument has a universal input range and will operate from a nominal 115V or 230V
mains supply without adjustment. Check that the local supply meets the AC Input requirement
given in the Specification see section 17.
4.2 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 mains lead set
should be used which is fitted with the required wall plug and an IEC60320 C13 connector for
the instrument end. To determine the minimum current rating of the lead-set for the intended
AC supply, refer to the power rating information on the equipment or in the Specification.
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.
4.3 Mounting
This instrument is suitable both for bench use and rack mounting. It is delivered with feet for
bench mounting. The front feet include a tilt mechanism for optimal panel angle.
A rack kit for mounting in a 19” rack is available from the manufacturers, or their agents and
distributors overseas.
4.4 Ventilation
The power supply is cooled by an intelligent multi-speed fan which vents at the rear. Cooling
air is drawn in through slots in the front panel directly above the terminals, and by slots in the
base of the unit close to the front.
In a rack-mounted situation no additional space is required above or to the sides of the unit.
Some air space below the unit will ensure the best possible airflow and the lowest fan speeds
for a given power, but is not required.
Ensure that the ventilation slots and rear fan exhaust are not obstructed. In the event of
overheating, a temperature trip will turn all of the outputs off – see section 11.8.

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5Connections
5.1 Front Panel Connections
For each output, the load should be connected to the positive (red) and negative (black)
terminals marked OUTPUT.
Both are fully floating and either can be connected to ground or to a terminal of another output.
Remote sense connections to the load, if required, are made from the positive (+) and negative
(-) SENSE terminals. Switch the SENSE switch to REMOTE when remote sensing is required.
Switch back to LOCAL when remote sensing is not in use. See section 11.2 for more
information.
The grey terminal marked with an Earth symbol is connected to the chassis and safety
earth ground.
5.2 Rear Panel Connections (MX100TP)
The MX100T has only an AC power connection socket on the rear panel.The MX100TP has
duplicate power and sense terminals on the rear panel and offers full remote control capabilities
through USB, RS232, GPIB and LAN interfaces.
All interfaces are fully isolated from the power supply output terminals. USB, RS232 and GPIB
interfaces are connected to chassis ground. The LAN interface is isolated by standard network
transformers.
Rear connections for the MX100TP are detailed in section 12.1.
5.3 Terminal Voltages and Safety
The outputs of the power supply are fully floating and may connected to other equipment resulting in
the voltage appearing at a terminal being greater than the output voltage alone.
The maximum permissible voltage between any terminal and earth ground ( ) is 300VDC;
the maximum permissible voltage between either terminal of one output and either terminal
of another output on the same power supply is also 300VDC.
WARNING! Such voltages are exceedingly hazardous and great care should be taken by the user.
The front terminals are intrinsically touch proof, but hazard may still exist depending upon the type
of connection made to the terminal. On no account should the connections be touched under such
use. For the MX100TP only, voltages appearing on the front terminals will also appear on the
rear terminals. The rear terminals have protective walls but are not intrinsically touch proof,
and additional precautions must be taken if voltages above 70 volts DC could be present.
If any hazardous voltages could exist, all connections to the front or rear terminals must be made
with the power switched off on all voltage sources.
5.4 Output Protection
Each output is protected against the application of external forward voltages up to 50 volts
(outputs 1 and 2) and 90 volts (output 3). Each output is protected against the application of
reverse voltages by a clamp diode with a maximum continuous current capability of 3 amps.
Further protection is provided by OVP and OCP trips and an over-temperature trip.

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6Initial Operation
6.1 AC Power On/Off
Power ~O/I
The AC power switch is located at the bottom left of the front panel.
At power-up a screen is displayed that shows the firmware revision number and a brief
description of the starting conditions. These can be changed from System Preferences if
required – see section 10.1.
6.2 DC Output On/Off
On/Off
Each output has its own DC On/Off key. These are positioned directly above
each set of output terminals and are numbered 1, 2 and 3 from left to right.
Alternate presses of the key turns the output on or off. The on state is
indicated by the key being illuminated in red.
At power-up the default behaviour is for all the outputs to be set to off.
However, the user can change this default setting such that the outputs are
restored to their condition when the instrument was switched off. This change is made from
System Preferences - see section 10.1.
Multi-On / Multi-Off
It is also possible to turn all three outputs on or off simultaneously
using the Multi-On and Multi-Off keys. By default these keys operate
on all three outputs simultaneously but the behaviour can be changed
to turn the outputs on or off in a timed sequence or to remove an
output from either Multi-On or Multi-Off control, see section 9.4.

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7The Display and Soft Key Control
With the exception of output On/Off, the primary control of the
power supply is via the six keys directly below the display.
These are referred to as “soft keys” because their function is not
fixed but is annotated by legends on the display directly above.
The function of the keys depends upon the type of screen selected. There are five
main screens which are selected by the keys to the right of the display. The
selected key is illuminated.
The main screen (Home) displays all three outputs simultaneously, the system
menu screen (Menu) provides access to advanced functions, and the individual output screens
(O/P n) show more detailed information for each individual output.
7.1 The Home Screen
The main (Home) screen is selected
with the key marked Home and shows
the primary information for all three
outputs simultaneously whilst enabling
voltage and current to be set for any
output.
The display is divided into three
sections representing outputs 1, 2 and
3 from left to right. For each output
the display shows operating mode on
the top line as CV (constant voltage), CC (constant current) or SET (Settings). SET is
displayed when the output is off.
The two meters directly below show the set values for voltage and current when the output is
off, and the voltage and current being supplied to the load when the output is on.
With an output on, the three lines below the meters show the set voltage (Vset), the set current
(Iset) and the output range (Range). If the output is off, the Vset and Iset lines do not appear
(because the meters are showing the set values).
The six soft keys are used to set
voltage (Vset) or current (Iset) for
each of the outputs. The presently
selected output and parameter (V or I)
is indicated by illumination of the soft
key and by a flashing arrow in front of
the parameter to be adjusted. The
user can move freely between setting
voltage or current for any output by
pressing the appropriate key.
Pressing the same key again or
pressing ESC (Escape) cancels the
key and disables all setting capability.
7.2 Individual Output Screens
Each output has its own display screen selected with the keys O/P 1, O/P 2 and O/P 3. The
selected key is illuminated.
These enable additional parameters and functions to be controlled for that output including
Range, OVP & OCP, memory store & recall (Stores), and current meter averaging (Iavg).
These are detailed within section 7.

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7.3 Setting with the Keypad
Vset & Iset
Voltage or current can be set using the numeric keypad.
Upon pressing a numeric key, the OK key will start to flash. When the
numeric value entry is completed, pressing OK causes the value to be
accepted and actioned. Entry can be abandoned at any point by
pressing ESC (Escape). The new value being entered is shown directly
below the meters in a smaller font size.
Entry is in volts or amps to a resolution of 0.001 volts and 0.0001 amps for output 1, and 0.01
volts and 0.001 amps for outputs 2 and 3.
Entries need only to be completed as far as the desired digit of resolution, e.g. to enter 5.000
volts it is only necessary to enter 5 followed by OK.
7.4 Setting with the Spin Wheel
Vset & Iset
Voltage or current can alternatively be set using the spin wheel. The
wheel is disabled by default but can be enabled by pressing the key
below it which toggles its action on or off. When enabled the key is
illuminated. The wheel changes the output settings immediately, no OK
confirmation is required.
The wheel has a non-linear action. If it is moved slowly the value is
incremented in minimum steps (1mV/0.1mA for output 1, or 10mV/1mA
for outputs 2 or 3). When the wheel is rotated more rapidly the rate of
increment is increased enabling the value to be changed quickly.
7.4.1 Spin Wheel Action Options
The action of the spin wheel can be changed from System Preferences
to reduce the speed-related increment rate if preferred. Three choices are available: Normal
(default), Reduced acceleration, or Single Digit Increment.
Making changes is described in section 10.3.

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8Power Supply Settings
The procedures for setting voltage and current, either numerically or via the spin wheel, have
been explained in the previous section.
8.1 CV and CC modes, Viewing Settings (Limits)
Depending upon the load conditions, the actual voltage and actual current applying to the load
will not both be equal to their set values.
Output On – CV Mode
When in constant voltage mode the output voltage is equal to the set value and CV is shown on
the top line of the display. The current setting represents the limiting value of current that could
flow (the current limit).
Output On – CC Mode
When in constant current mode the output current is equal to the set value and CC is shown on
the top line of the display. The voltage setting represents the limiting value of voltage that could
be applied (the voltage limit).
Switch-over between CV and CC modes occurs automatically dependent upon the load
conditions and the settings. The voltage and current settings may also be described as limits
since they represent the maximum values that can apply at the load.
To draw attention to the CC symbol and make it clear at a glance, a flashing arrow is
placed next to it. It is also possible to set an audible alert – see section 10.2.
Output Off
When an output is off, the meters show these set values and SET is shown on the top line of
the display. When an output is on, the values of voltage generated and current flowing are
shown together with CV or CC.
View Settings/ View Limits
It is also possible to view the set values for all three outputs at any time. Pressing the OK key
(also marked View Limits or View Settings) causes the display to change so that the meters all
show the limits values for a period of about 2 seconds.
8.2 Setting with Individual Output Screens
The three illuminated keys marked
O/P 1, O/P 2 and O/P 3 select a
screen that controls only the chosen
output. This screen provides more
information than the main (Home)
screen (see section 6.1), and allows
additional parameters to be set.
The top line shows the operating
mode (CV, CC or SET) together with
the voltage tracking status. The
meters are displayed in a larger font, and the complete settings status for the output is shown
below them.
The six soft keys are used to set voltage and current (Vset and Iset), over-voltage and over-
current protection levels (OVP & OCP), current meter averaging (Iavg), range selection (Range)
and store or recall of settings (Stores).
Setting voltage or current is as previously described for the Home screen – see section 6.1.

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8.3 Power Display (VxA)
The power being supplied to the load (VxA) is displayed in watts on the lower right hand side.
The value is calculated from the metered values of voltage and current and is displayed with a
maximum resolution of 0.001 watts for output 1 and 0.01 watts for outputs 2 and 3.
8.4 Selecting Current Meter Averaging
Iavg
Current meter averaging is useful when the load current is varying rapidly. It can help to reduce
the variation in the reading and make the display easier to follow.
Selection is done from each individual output screen. Pressing the soft key
marked Iavg toggles current meter averaging on or off. The present status is
shown in the area above the key and by an asterisk ( s symbol) appearing
directly after the current meter. This symbol is also displayed on the Home
screen.
Three levels of averaging representing low, medium or high can be selected from the System
Menu - see section 9.2. The default value is medium.
8.5 Setting Over-Voltage and Over-Current protection
OVP/OCP
The power supply offers user adjustable over-voltage protection (OVP) and over-current
protection (OCP). If a voltage is detected that exceeds the OVP level, or a current is detected
that exceeds the OCP level, the output is switched off and the message OVP or OCP is
displayed.
OVP is adjustable between 1V and 40V for outputs 1 and 2, and between 1V and 80V for
output 3. OCP is adjustable between 0.01A and 7A for outputs 1 and 2, and between 0.01A
and 3.5A for output 3.
Pressing the OVP/OCP soft key
creates a new set of soft keys from
which OVP & OCP values can be set
or turned on or off.
Pressing OVP Set causes the key to
illuminate and makes the OVP value settable. A new value can be entered using the numeric
keypad or by the spin-wheel if enabled. OVP can be turned off by pressing OVP OFF, and
turned back on by pressing OVP On. The previous OVP value is retained when OVP is off and
is displayed in brackets.
Similar capabilities are provided for controlling OCP.
Note that, when set to OFF, the function is not completely disabled but is set to the maximum
value for the output. Thus if OVP was set to OFF on output 1 and an external voltage greater
than 40V was applied to the terminals, an OVP trip would occur.
More information on using OVP and OCP is provided in section 11.7.

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8.6 Setting the Voltage/Current Range
Range
Each output has more than one range. For output 1 the choice is 35V/3A or 16V/6A. For
output 2 the choice is 35V/3A, 16V/6A or 35V/6A. For output 3 the choice is 35V/3A, 70V/1.5A
or 70V/3A.
Note that selecting 35V/6A on output 2 will disable output 3, and selecting 70V/3A on output 3
will disable output 2.
Pressing the Range soft key brings
up a menu screen which shows the
currently selected range by
illumination of the soft key. Pressing
another key selects a new range
which is actioned when OK/Exit is
pressed.
Note that a change of range can only be made when the output is off. If the output is on, a
message will prompt the user to turn it off.
8.7 Store and Recall of Settings
Stores
Each output has 50 memory stores
capable of storing range, voltage,
current, OVP and OCP. Pressing the
Stores soft key brings up a menu
screen which shows the present
contents of the memories from which
settings can be stored or recalled.
The memories are numbered from 00
to 49 with the currently selected line
highlighted. The location can be
scrolled using the spin wheel or stepped through using the arrow keys. It is also possible to
jump directly to a location by entering a two digit number (e.g. 07 or 45). Unused memory
locations are shown by the word Empty.
Pressing the Store key writes the present settings of the output into the selected memory
location. If the position already has settings stored within it a confirmation is required.
Pressing the Recall key transfers the stored settings of the selected memory location to the
output. This happens immediately that the Recall key is pressed. Note that, if the recalled
range is different from the present range, the output will be automatically turned off.
The contents of a particular location can be deleted by pressing the Delete soft key. A
confirmation is required.
From the Delete confirmation screen it is also possible to delete the contents of all 50 locations
by pressing Del All. A confirmation is required.
Store and Recall for Multiple Outputs
It is also possible to store and recall settings for all three outputs simultaneously. This is
described in Advanced Functions section 9.3.

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8.8 The System Menu Screen
The operation of the System Menu screen is selected with the key marked Menu
which illuminates when pressed.
System menu functions are described within section 9 - Advanced Functions.
8.9 Voltage Tracking
The power supply can be set-up such that the voltage of output 2 tracks that of
output 1, or that output 3 tracks output 2, or that outputs 2 and 3 both track output
1. The tracking status is shown on the top line of the display. Voltage tracking is
selected from the System Menu, see section 9.1.
8.10 Locking the Front Panel
Lock
The front panel can be “locked” such that the power supply will not respond to any
key presses. This is in order to prevent an accidental changes to settings.
Pressing the Lock key disables the front panel. This is indicated by the key being
illuminated in green. Once locked any key press creates a warning message on the display.
To unlock the front panel, press and hold the Lock key for more than one second.
For additional security it is also possible to lock the front panel using a pass-code. This is
explained in Advanced Functions section 9.5.

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9Display Symbols
Some functions are indicated by symbols or abbreviation on the display as follows:
Function
Home Screen
Individual Output Screen
Output on, constant voltage
mode
CV shown on the top line
next to the output number
CV shown on the top line
Output on, constant current
mode
CC shown plus flashing
arrow next to the output
number
CC shown plus flashing
arrow on the top line
Output off SET shown on the top line
next to the output number
SET shown on the top line
Current meter averaging on symbol after current meter symbol after current meter
(and Iavg ON in small font)
Voltage tracking TRK > shown on top line
between the Master and
Slave
V Track ON or OFF shown
on top line plus Master or
Slave
Multi-On/Multi-Off not set to
defaults (set to Delayed or
Never)
Clock symbol on top line next
to the mode indication
for the affected output
Clock symbol on top line
Power supply under remote
control (MX100TP only)
REM shown at top right hand
side
REM shown at top right hand
side
LAN connection status
(MX100TP only)
LAN symbol shown at top
right hand side. (see note)
LAN symbol shown at top
right hand side (see note)
Note that the LAN symbol changes to reflect the connection status. This is detailed within the
Remote Control pages - see section 12.2.4.
The example screen opposite shows
output 1 in constant current (CC)
mode, output 2 in constant voltage
(CV) mode and output 3 showing
settings (output off).
Output 3 is set to track output 2, and
outputs 2 and 3 have Multi-On/Multi-
Off not set to defaults.
Output 3 current meter has averaging
turned on.

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10 Menu - Advanced Functions
Menu
Pressing the key marked Menu selects the System Menu screen.
This provides access to advanced options and functions. When the system menu is
displayed, setting of output parameters is not possible but operation of the output
On/Off keys is unaffected.
Each item of the system menu is selected by using the two arrow keys, or by turning
the spin wheel until the desired line is highlighted, and then pressing the Select soft
key. This selects a menu screen relating to the function selected.
Help Text
Alternatively, pressing the Help soft
key provides some on-screen
explanation of the highlighted function.
10.1 Setting Voltage Tracking
Menu > Voltage Tracking Setup
By default all three outputs are
completely independent. However, it
is possible to make the voltage of an
output always equal to the voltage set
on another output. This is called
voltage tracking.
Tracking voltages can be useful in
setting up adjustable voltages of equal
or opposite polarity, or when outputs
are wired in parallel or in series.
Three alternative voltage tracking arrangements are possible:
Mode 1 Output 2 tracks Output 1.
Mode 2 Output 2 and Output 3 both track Output 1.
Mode 3 Output 3 tracks Output 2.
The controlling output is described as Master, whilst a controlled output is described as Slave.
Voltage tracking can only be selected when the voltage range for the Slave output is equal to or
higher than that of the Master output.
The tracking condition is displayed on the top line of the display, see section 8.
When tracking is set, changing the range of either the Master or Slave output will cancel
tracking regardless of the direction of the change.

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10.2 Current Meter Averaging Setup
Menu > Current Meter Averaging Setup
The degree of averaging of the current meter reading when Iavg is turned on (see section 7.4)
can be set individually for each output.
The System Menu function “Current Meter Averaging Setup” provides an individual choice of
low, medium or high (Low, Medium, High) for each of the three outputs set via the soft keys.
The default value is medium.
10.3 Store and Recall of Settings for All Outputs
Menu > Stores: All Outputs (Store/Recall)
Each output has its own set of 50
memories in which settings can be
stored for that output (see section
7.7). A further set of 50 memories is
provided that allow the user to store
and recall the settings status for all
three outputs simultaneously.
Unlike the individual memories, which
store only Range, Volts, Amps, and
OVP/OCP, these memories also store
the output ON/OFF state, current meter averaging state, and the Multi-On/Multi-Off settings.
The System Menu function “Stores: All Outputs (Store/Recall)” creates a screen similar to the
Stores screen for the individual outputs, but with an extra column for ON/OFF. The three
outputs are listed on successive rows.
The output On/Off state is included in order to allow memories to be recalled in sequence
including the turning of outputs on or off. Note that recalling a memory will override the existing
On/Off state and this should be considered when setting up the power supply prior to storing
each status entry.
Current meter averaging being set on is indicated by the symbol after the set current value.
Multi-On/Multi-Off settings other than both set to Quick are indicated by a clock symbol
after the On/Off state.
Note that output delay settings are only applied when the Multi-On/Multi-Off function is used
and not when a memory is recalled.
10.4 Multi-On / Multi-Off Operation and Sequencing
Menu > Multi-On/Multi-Off Setup
The two keys on the bottom right hand side marked Multi-On and
Multi-Off control the On and Off behaviour for all three outputs.
By default these keys provide a synchronous On/Off capability
whereby all three outputs are turned on or turned off simultaneously
by pressing a single key.
The System Menu function “Multi-On/Multi-Off Setup” enables the operation of these keys to be
changed to suit the user’s requirements. Delays between the switching of the outputs can be
introduced to create an On or Off sequence, and any individual output can be excluded from
Multi-On or Multi-Off control.

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At ex-factory defaults, the On and Off
delays are all set to Quick causing
them to respond immediately to the
key press. The Tab arrow keys move
through the On and Off states for the
outputs which can be changed using
the soft keys.
Delay sets a time value in milliseconds between 10ms and 20,000ms (20 seconds)
using the spin wheel.
Never removes an output completely from control by the Multi-On or Multi-Off key.
Quick returns to immediate response.
Note that any previously set delay value is retained when set to Quick or Never and is restored
when Delay is selected again.
When any of the settings is other than Quick, a clock symbol is displayed on the top line of
the main (Home) display, and of the individual output screen(s) to which it applies.
Note that the set delays apply only to the initiation of an output being turned on or turned off.
The actual delay will depend upon the slew-rate limited turn-on or turn-off times applying to a
particular output and its load. See section 11.6 for more information.
For short delay sequences, the key will flash briefly when pressed. For longer delays it will
continue to flash until the sequence is completed. Where the longest delay is below
approximately 250ms, the key may not flash at all.
10.4.1 Emergency Off
When an Off sequence that includes long delays is in progress, a second press of the Multi-Off
key will turn all three outputs off immediately, including any outputs omitted from the sequence
(i.e. set to Never). Thus a double press (or press and hold) of the Multi-Off key will immediately
turn off all the outputs regardless of the sequence settings.
The individual output On/Off keys also remain active during a sequence and can be used to
override a delay.
10.5 Pass Code Locking of the Front Panel
Menu > Lock Keypad using Pass Code
In addition to the normal locking of
the front panel (see section 7.10) it is
also possible to lock the front panel
securely by setting a pass code. This
might be appropriate when the power
supply is installed within a system
where, once set up, changes must
only be made by the installer.
The pass code is a “once only” code.
After the system has been unlocked,
the pass code is discarded and a new code (or the same one) must be entered in order to lock
it again.
In the event that the user forgets the pass code, the power supply can be unlocked using the
master pass code of 7835 which is always active.

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10.6 System Preferences
Menu > System Preferences
Various aspects of the power supply operation can be changed from the System Preferences
function. These are detailed in section 10.
10.7 Setting to Factory Defaults
Menu > Factory Defaults
This function can be used to return most of the instrument settings including Voltage, Current,
Range, OVP, OCP, Output On/Off, Current Meter Averaging, Multi-On/Off Action and System
Preferences back to the factory default values as listed in section 18.
The Store memories for both individual outputs and All Outputs are unaffected. To clear each
bank of Stores it is necessary to use the function Stores > Delete > Del All.
LCD contrast setting and remote interface settings (MX100TP only) are also unaffected.
10.8 Adjusting LCD Contrast
Menu > Adjust LCD Contrast
The LCD contrast can be adjusted over a wide range. The setting is displayed numerically as a
percentage. The display can also be inverted from black on white to white on black.
10.9 Calibration
Menu > Calibration
The Calibration function enables the instrument to be re-calibrated when required.
Calibration will overwrite the existing settings and should only be carried out by qualified
personnel in conjunction with the instrument Service Guide and the necessary precision
equipment.
A 4-digit pass code can be set to prevent unauthorised calibration if required.
10.10 Remote Control Interfaces (MX100TP only)
Menu > Remote Control Interfaces
Settings for the GPIB and LAN interfaces can be observed using this function.
Details for the GPIB interface are within the Remote Interfaces Configuration section 12.2.1.
Details for the LAN interface are within the Remote Interfaces Configuration section 12.2.4.