AimTTi MX100Q User manual

MX100Q & MX100QP
Triple Output Multi-Range DC Power Supply INSTRUCTION MANUAL

Page 1
CONTENTS
1Product Description......................................................................................................3
1.1 Range Combinations ................................................................................................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 (MX100QP).......................................................................7
4.3Terminal Voltages and Safety...................................................................................8
4.4 Output Protection......................................................................................................8
5Initial Operation.............................................................................................................9
5.1 Switching On ............................................................................................................9
5.2 Keyboard ..................................................................................................................9
5.3 Display....................................................................................................................11
6Power Supply Settings ...............................................................................................11
6.1 CV and CC modes, Viewing Settings .....................................................................11
6.2 Setting with Individual Output Screens ...................................................................12
6.3 Power Display (VxA)...............................................................................................12
6.4 Selecting Current Meter Averaging.........................................................................12
6.5 Setting Over-Voltage and Over-Current protection.................................................13
6.6 Setting the Voltage/Current Range.........................................................................13
6.7 Store and Recall of Settings ...................................................................................14
6.8 The System Menu Screen ......................................................................................14
6.9 Voltage Tracking.....................................................................................................14
7Display Symbols .........................................................................................................15
8Menu - Advanced Functions ......................................................................................16
8.1 Setting Voltage Tracking ........................................................................................16
8.2 Current Meter Averaging Setup..............................................................................17
8.3 Store and Recall of Settings for All Outputs ...........................................................17
8.4 Multi-On / Multi-Off Operation and Sequencing......................................................17
8.4.1 Emergency Off......................................................................................................18
8.5 Pass Code Locking of the Front Panel ...................................................................18
8.6 System Preferences ...............................................................................................19
8.7 Setting to Factory Defaults .....................................................................................19
8.8 Adjusting LCD Contrast ..........................................................................................19
8.9 Calibration ..............................................................................................................19
8.10 Remote Control Interfaces (MX100QP only) .......................................................19
9Changing System Preferences ..................................................................................20
9.1 Status at Power-up .................................................................................................20
9.2 Alert Sound (Beep) .................................................................................................20
9.3 Spin wheel Function ...............................................................................................20
10 Notes on Operation..................................................................................................21
10.1 Accuracy and Resolution.....................................................................................21

Page 2
10.2 Remote Sense ....................................................................................................21
10.3 Parallel Wiring of Outputs....................................................................................21
10.4 Series Wiring of Outputs .....................................................................................22
10.5 Instantaneous Current Output .............................................................................22
10.6 Output On/Off and Response Speed...................................................................22
10.7 Using OVP and OCP...........................................................................................23
10.7.1 OCP Trip at Output On .........................................................................................23
10.8 Over-temperature Trip (OTP) ..............................................................................23
11 Remote Interface Operation (MX100QP only)........................................................24
11.1 Remote Interface Configuration ..........................................................................24
11.1.1 GPIB Interface (optional) ......................................................................................24
11.1.2 RS232 Interface....................................................................................................25
11.1.3 USB Interface and Device Driver Installation ........................................................25
11.1.4 LAN Interface........................................................................................................26
11.1.5 LAN IP Address and Hostname ............................................................................27
11.1.6 Interface Locking ..................................................................................................28
11.1.7 Status Reporting ...................................................................................................28
12 Remote Commands (MX100QP only) .....................................................................34
12.1 General ...............................................................................................................34
12.1.1 Remote and Local Operation ................................................................................34
12.1.2 Remote Command Handling.................................................................................34
12.1.3 Remote Command Formats..................................................................................34
12.1.4 Command Timing..................................................................................................35
12.1.5 Response Formats................................................................................................35
12.2 Command List .....................................................................................................35
12.2.1 Instrument Function Commands ...........................................................................35
12.2.2 Common Commands ............................................................................................37
12.2.3 Status Commands ................................................................................................38
12.2.4 Interface Management Commands.......................................................................39
13 Maintenance .............................................................................................................40
13.1 Cleaning ..............................................................................................................40
13.2 Fuse ....................................................................................................................40
13.3 Calibration ...........................................................................................................40
13.4 Firmware Update.................................................................................................40
14 Technical Specifications .........................................................................................41
15 Default Values ..........................................................................................................44
Note: The latest revisions of this manual, device drivers and software tools can be
downloaded from: http://www.aimtti.com/support

Page 3
1Product Description
The MX100Q is a quad output laboratory power supply incorporating four 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 (210 watts). 58 range
combinations are available as shown in the chart ‘Range Combinations’.
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 four 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 ¾ rack width, 3U high case with front input ventilation. An
intelligent fan is used to minimise cooling noise.
The MX100Q P version has the same manual control features and adds USB, RS232, GPIB
(Optional) and LXI compliant LAN interfaces together with duplicate power and sense terminals
at the rear.

Page 4
1.1 Range Combinations
Output 1
Output 2
Output 3
Output 4
35V/3A
35V/3A
35V/3A
35V/3A
16V/6A
35V/3A
35V/3A
35V/3A
35V/3A
16V/6A
35V/3A
35V/3A
16V/6A
16V/6A
35V/3A
35V/3A
16V/6A
16V/6A
70V/1.5A
35V/3A
16V/6A
16V/6A
35V/3A
70V/1.5A
16V/6A
16V/6A
70V/1.5A
70V/1.5A
35V/3A
16V/6A
70V/1.5A
70V/1.5A
16V/6A
35V/3A
70V/1.5A
70V/1.5A
35V/3A
35V/3A
70V/1.5A
70V/1.5A
35V/3A
35V/3A
35V/3A
70V/1.5A
35V/3A
35V/3A
70V/1.5A
35V/3A
35V/3A
35V/6A
35V/3A
-
35V/3A
35V/6A
-
35V/3A
35V/3A
35V/6A
70V/1.5A
-
35V/3A
35V/6A
-
70V/1.5A
16V/6A
35V/6A
35V/3A
-
16V/6A
35V/6A
-
35V/3A
16V/6A
35V/6A
70V/1.5A
-
16V/6A
35V/6A
-
70V/1.5A
35V/6A
35V/3A
35V/3A
-
35V/6A
35V/3A
-
35V/3A
35V/6A
35V/3A
70V/1.5A
-
35V/6A
35V/3A
-
70V/1.5A
35V/6A
16V/6A
35V/3A
-
35V/6A
16V/6A
-
35V/3A
35V/6A
16V/6A
70V/1.5A
-
35V/6A
16V/6A
-
70V/1.5A
35V/6A
-
35V/3A
35V/3A
35V/6A
-
70V/1.5A
35V/3A
35V/6A
-
35V/3A
70V/1.5A
35V/6A
-
70V/1.5A
70V/1.5A
-
35V/6A
35V/3A
35V/3A
-
35V/6A
70V/1.5A
35V/3A
-
35V/6A
35V/3A
70V/1.5A
-
35V/6A
70V/1.5A
70V/1.5A
35V/3A
35V/3A
70V/3A
-
16V/6A
35V/3A
70V/3A
-
35V/3A
16V/6A
70V/3A
-
16V/6A
16V/6A
70V/3A
-
35V/3A
35V/3A
-
70V/3A
16V/6A
35V/3A
-
70V/3A
35V/3A
16V/6A
-
70V/3A
16V/6A
16V/6A
-
70V/3A
35V/3A
-
70V/3A
70V/1.5A
-
35V/3A
70V/3A
70V/1.5A
16V/6A
-
70V/3A
70V/1.5A
-
16V/6A
70V/3A
70V/1.5A
35V/3A
-
70V/3A
35V/3A
-
35V/3A
70V/3A
35V/3A
16V/6A
-
70V/3A
35V/3A
-
16V/6A
70V/3A
35V/3A
35V/6A
35V/6A
-
-
35V/6A
-
70V/3A
-
35V/6A
-
-
70V/3A
-
35V/6A
70V/3A
-
-
35V/6A
-
70V/3A
-
-
70V/3A
70V/3A

Page 5
2Safety
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)

3Installation
3.1 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 14.
3.2 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-setfor 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.
3.3 Mounting
This instrument issuitable both for bench use and rack mounting. Itisdelivered with feet for
bench mounting. The front feet include a tilt mechanism for optimal panel angle.
Arack kitfor mounting in a 19” rack isavailable from the manufacturers, or their agentsand
distributors overseas.
3.4 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, when using the recommended Aim-TTi rack mount (RM460), 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 10.8.
Page 6

Page 7
4Connections
4.1 Front Panel Connections
A- 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.
B- 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 10.2 for more information.
C- The grey terminal marked with an Earth symbol is connected to the chassis and safety
earth ground.
4.2 Rear Panel Connections (MX100QP)
D- The MX100Q has only an AC power connection socket on the rear panel.
The MX100QP also has:
E- Power and sense terminals
F- USB
G- RS232
H- LAN
I- GPIB
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.

Page 8
Output Connections
The Output and Sense terminals are duplicated on the rear panel terminal block marked
Output +, Output -, Sense + and Sense -. These connections are paralleled with their front
panel equivalents.
Switch the front panel LOCAL/REMOTE switch to REMOTE when remote sensing is required.
When the rear panel output terminals are used, the use of remote sense is always
recommended to ensure that output regulation is maintained within specification; connections
can be made to either the front or the rear remote sense terminals but never to both pairs of
terminals at the same time. Switch back to LOCAL when remote sensing is not in use.
4.3 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 MX100QP 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.
A protective cover is provided and must be used if voltages above 70 volts DC could be
present; it is advised that the cover is used at all times.
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.
4.4 Output Protection
Each output is protected against the application of external forward voltages up to 40 volts
(outputs 1 and 2) and 80 volts (output 3 and 4). 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.

Page 9
5Initial Operation
5.1 Switching On
1- Power ~O/I
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 9.1.
5.2 Keyboard
The front panel contains the liquid crystal display (LCD) and the keyboard which are used together
to control all instrument functions.
The keys are grouped as follows:
2- DC output On/Off
Each output has its own DC On/Off key. Alternate presses of the key turn 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 9.1.
3- Soft Keys
The function of these keys change as the instrument is operated. The current function is shown
on the LCD in a box above each key. The selected key is illuminated. An empty box means that
the key currently has no function.
4- Multi-On / Multi-Off
Multi-On and Multi-Off keys turn all four outputs on or off simultaneously. By default, these keys
operate on all four 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 8.4.

5- Display control keys
There are five main screens which are selected by the keys. The selected key isilluminated.
(Home) displays all four outputs simultaneously,
(Menu) provides access to advanced functions,
(O/P n) show more detailed information for each individual output.
Note: Ifan output isdisabled, an error beep will occurand the output screen is unavailable.
6- Keypad
Voltage or current can be set using the numeric keypad.
Upon pressing a numeric key, the OK keywill 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 isin volts or amps to a resolution of 0.001 volts and 0.0001 amps for 16V and 35V
ranges,and 0.01 volts and 0.001 amps for 70V range.
Entries need onlyto be completed as far as the desired digit ofresolution, e.g. toenter
5.000 volts itisonlynecessary toenter 5 followed by OK.
Lock key
The front panel can be “locked” such that the power supply will not respond to any keypresses.
This isin order to prevent accidental changes to settings.
Note: Individual output screens and the home screen can still be viewed, but not edited.
The Lock keydisables the front panel.This isindicated by the key being illuminated in green.
Once locked any keypress creates a warning message on the display. To unlock the front
panel, press and hold the Lock keyfor more than one second.
For additional security itisalso possible to lock the front panel using a pass-code. This is
explained in Advanced Functions section 8.5.
7- Spin wheel
Voltage or current can alternatively be set using the spin wheel. The spin wheel is disabled by
default but can be enabled by pressing the key below itwhich toggles its action on or off. When
enabled the key isilluminated. The spin wheel changes the output settings immediately, no OK
confirmation is required.
The spin wheel has a non-linear action. If itismoved slowly the value is incremented in
minimum steps (1mV/0.1mA for 16Vand 35V ranges, or 10mV/0.1mA for 70V range). When
the spin wheel is rotated more rapidly the rate of increment isincreased enabling the value to
be changed quickly.
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 isdescribed in section 9.3.
Page 10

Page 11
5.3 Display
The Home Screen
The Home screen shows the
primary information for all four
outputs simultaneously whilst
enabling voltage and current to be
set for any output.
The display is divided into four
sections representing outputs 1, 2 ,3
and 4 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 eight 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.
6Power Supply Settings
The procedures for setting voltage and current, either numerically or via the spin wheel, have
been explained in the previous section.
6.1 CV and CC modes, Viewing Settings
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.

Page 12
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 9.2.
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
It is also possible to view the set values for all four outputs at any time. Pressing the OK key
(also marked View Settings) causes the display to change so that the meters all show the limits
values for a period of about 2 seconds.
6.2 Setting with Individual Output Screens
Each output has its own display
screen selected with the keys O/P 1,
O/P 2, O/P 3 and O/P 4. The
selected key is illuminated. This
screen provides more information
than the main (Home) screen (see
section 5.3), 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 eight 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 5.3.
6.3 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 2; 0.01 watts for outputs 3 and 4.
6.4 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 ( * 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 8.2. The default value is medium.

Page 13
6.5 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 and 4. OCP is adjustable between 0.01A and 7A for outputs 1 and 2, and between
0.01A and 3.5A for output 3 and 4.
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 10.7.
6.6 Setting the Voltage/Current Range
Range
Each output has more than one range. For outputs 1 and 2 the choice is 35V/3A, 16V/6A or
35V/6A. For outputs 3 and 4 the choice is 35V/3A, 70V/1.5A or 70V/3A.
Note that selecting a high power setting may require the disabling of other outputs, see table in
section 1.
Pressing the Range soft key brings
up a menu screen which indicates
the currently selected range and
output with a flashing arrow.
All output ranges can be amended
or disabled from this screen using
the soft keys, select the output with
the up and down arrow soft keys and press the desired range soft key. Pressing the cancel soft
key will return to the output screen and the range will remain unchanged, pressing the OK soft
key will action the changes made.
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.

Page 14
6.7 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 when 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 four outputs simultaneously. This is
described in Advanced Functions section 8.3.
6.8 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 8 - Advanced Functions.
6.9 Voltage Tracking
The power supply can be set-up such that the voltage of output 2 tracks that of output 1, or that
output 4 tracks output 3, this tracking can be set individually or simultaneously. The tracking
status is shown on the top line of the display. Voltage tracking is selected from the System
Menu, see section 8.1.

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7Display 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 (MX100QP only)
REM shown at top right hand
side
REM shown at top right hand
side
LAN connection status
(MX100QP 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 11.1.4.
The example screen opposite shows
output 1 and 2 in constant voltage
(CV) mode and output 3 and 4
showing settings (output off).
Output 1 has Multi-On/Multi-Off not set
to default.
Output 2 is set to track output 1.
Output 3 current meter has averaging turned on.

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8Menu - 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.
8.1 Setting Voltage Tracking
Menu > Voltage Tracking Setup
By default, all four 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 4 tracks Output 3.
Mode 3 Output 2 tracks Output 1 and Output 4 tracks Output 3.
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 7.
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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8.2 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 6.4)
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 four outputs set via the soft keys. The
default value is medium.
8.3 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 0).
A further set of 50 memories is
provided that allow the user to store
and recall the settings status for all
four 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 four 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.
8.4 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 four outputs.
By default, these keys provide a synchronous On/Off capability
whereby all four 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 10.6 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.
8.4.1 Emergency Off
When an Off sequence that includes long delays is in progress, a second press of the Multi-Off
key will turn all four 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.
8.5 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 0) 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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8.6 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 9.
8.7 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 Error! Reference source not
found..
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 (MX100QP only) are also unaffected.
8.8 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.
8.9 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.
8.10 Remote Control Interfaces (MX100QP 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 11.1.1.
Details for the LAN interface are within the Remote Interfaces Configuration section 11.1.4.