Nagra MPS User manual

P/N: 2055100159
All rights reserved –© 2014 rev 1
MPS –Multiple Power Supply
User manual

3
Nagra –MPS
Table of contents
Safety warning ........................................................................................... 4
Warranty ................................................................................................... 4
Congratulations .......................................................................................... 5
Package contents..................................................................................... 5
Installation................................................................................................. 6
Positioning .............................................................................................. 6
Connection block ..................................................................................... 6
Front panel ............................................................................................. 7
Connecting the mains............................................................................... 7
Which output to use? ............................................................................... 8
Connecting your Nagra gear to the MPS ..................................................... 8
Connecting a Nagra BPS ........................................................................... 8
Fuse replacement .................................................................................... 9
Operating the MPS ................................................................................... 9
Nagra Modulometer ............................................................................... 10
LED and Modulometer intensity adjustment .............................................. 10
Remote control...................................................................................... 11
MPS with battery option ......................................................................... 12
Starting the MPS using the trigger input REM ........................................... 13
Using the trigger output AMP.................................................................. 13
Case cleaning ........................................................................................ 13
Technical specifications .......................................................................... 14
Déclaration de conformité CE ..................................................................... 15
CE Declaration of conformity ................................................................... 15

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Nagra –MPS
Safety warning
Read this manual carefully before operating the MPS;
Please contact your Nagra dealer, should you have any questions on
how to setup or the use of your MPS,;
Audio Technology Switzerland SA declines any responsibility in the
event of an accident caused by the non-observation of these
instructions or any other form of user negligence;
There are no user adjustments inside the MPS, do not attempt to open it.
Warranty
Audio Technology Switzerland SA, certifies that this device has been inspected
and tested before leaving our factory.
Every Nagra unit goes through our test laboratory. The measurement results are
recorded in the “Protocol” documentation that comes with the device.
We guarantee our products against all manufacturing defects, for a period of
three years, starting from the date of delivery to the customer (validated by the
serial number on the device casing and the invoice from an official Nagra dealer).
This warranty is only valid for the original purchaser of new equipment.
This limited warranty covers the repair and / or replacement of defective parts
and labor.
The absence of a serial number invalidates the warranty.
We decline any responsibility for damage resulting directly or indirectly from the
use of our products.
As we constantly strive to improve our products, we reserve the right to modify
them or change their specifications without notice.
Disposal of old electrical & electronic equipment (Applicable in the
European Union and other European countries with separate
collection systems).
This symbol on the product or on its packaging indicates that this
product shall not be treated as household waste. Instead it shall be
handed over to the applicable collection point for the recycling of
electrical and electronic equipment. By ensuring this product is
disposed of correctly, you will help prevent potential negative
consequences for the environment and human health. The
recycling of materials will help to conserve natural resources. For
more detailed information about recycling of this product, please
contact your local authority, your household waste disposal service
or the shop where you purchased the product.
Applicable to the following devices: MPS power supply.

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Nagra –MPS
Congratulations
Congratulations! You have just acquired a fine piece of equipment.
The MPS was created by an engineering team with more than 60 years’
experience designing world-class products for the professional audio, national
security and military businesses.
Ever since its creation in 1951, Nagra has built devices that offer exceptional
sonic performance. The company has received many awards for its technical
innovations and the excellence of its products. Among the most prestigious,
Nagra has been awarded three Oscars® and an Emmy®.
The professional and Hi-Fi ranges are designed by the same Research and
Development department. Nagra has launched a Hi-Fi range to allow a wider
public to benefit from technical advances that are often the privilege of the
professionals.
The MPS will enhance your Nagra system and allow you to access better sonic
performance and enjoy your music more.
Thank you for your confidence.
Package contents
Besides this manual and the MPS itself, the box contains:
Mains cable*;
Measurement protocol showing response curve characteristics for
your device, measured by the Nagra laboratory;
Please contact your Nagra dealer if anything is missing. If you have purchased
the optional battery it is already installed inside the MPS.
* Depending on the country of purchase, the cable supplied by Nagra will feature
a European, Swiss or US plug.

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Nagra –MPS
Installation
Positioning
In order to protect against the risks of fire and electric shock, please keep this
device away from rain and humidity, use exclusively indoors.
The Nagra MPS must rest on a stable support. We recommend that you use the
anti-vibration support, Nagra VFS, Vibration Free Support, developed by Nagra
consisting of isolated solid aluminum plates using the same silicon base damping
material as the Nagra CD mechanics. Please note that the MPS needs four spikes
and thus is not compatible with older VFS (before 2012). Feel free to contact your
Nagra dealer for more information.
it is not advised to place other Nagra units above or below the MPS, as it features
a large transformer. It is preferable to use a separate shelf for other devices.
Connection block
1. Main switch I for On / Ofor Off
2. Fuse holder
3. IEC socket for mains power cable
4. 12 V outputs for Nagra DC power cables
5. REM 1/8” jack input for home automation
6. AMP 1/8” jack output for triggering external components (marked AMP for Amplifiers)
7. DC output connector and voltage selector for BPS
1
2
3
4
5
6
1
2
7

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Nagra –MPS
Front panel
1. Infrared remote control receptor
2. LED remote-control indicator
3. Main selector: Rstands for Remote, OFF, ON, BAT
4. BAT, battery status
5. AMP, output trigger status, On when lit
6. Outputs 1 to 4 status
7 Modulometer selector: Mains voltage, battery voltage, individual output voltage
8. Modulometer
9. Modulometer and LED brightness selector
Connecting the mains
Place the front panel selector in the OFF
position, marked “O”. Insert the IEC
cable into the connector on the rear of
the Nagra MPS.
You may then push the mains switch to
the “I”position.
2
1
3
4
5
6
7
8
9

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Nagra –MPS
Which output to use?
Outputs 1 to 4 are all the same. They are completely isolated from one another,
so you may connect your equipment as you wish, whether it is digital or analog.
If your MPS has the internal battery option installed, we recommend using the
battery output #1 for any analog equipment particularly for phono stages such as
the VPS or the Melody with the phono option.
The 5th output is in parallel to output 1, so you can have a Jazz and a BPS on
battery simultaneously.
Connecting your Nagra gear to the MPS
Please note that the LEMO plug
features a red dot that must be
facing upwards for correct
insertion into the power input
connector.
The DC cables are directional.
One end is equipped with a
black ring (left plug in the
photo) which MUST be
connected to the MPS.
The other end (aluminum ring,
lower plug in the photo) must
be connected to the source
device.
When inserting the cable, you
will hear a click. This indicates
that the plug is securely
locked.
To disconnect the DC cable, hold the indicated ribbed section of the plug and pull
backwards.
Connecting a Nagra BPS
The BPS must be connected to the dc connector located below the #1 output.
Simply connect the BPS using the Nagra BPS cable.
Set the voltage selector to the 9 V position, on the left-hand side.
The connection between the BPS DC plug and the Lemo are not isolated from one
another, so it is advised to use Output 1 only for analog products rather than
digital.
The 12 V position is not use by current products, but is available for future
developments.

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Nagra –MPS
Fuse replacement
The fuse holder includes a
replacement fuse (the one on
the left).
The fuse type is FST 5x20 mm
250 V 630 mA and for 115 V use
1.25 A.
Should the replacement fuse
blow immediately following the
original, contact your dealer for
support.
Operating the MPS
These are the functions available from the main selector.
R (Remote) The MPS will be turned on and off by the remote control, or the input
trigger,for more information see page 13
OFF The MPS is in standby position (the internal battery, if fitted, will recharge)
ON The power on sequence will start, outputs 1 through 4 will be powered and then
the AMP output triggered, for more information about the latter see page 13
BAT The MPS will turn ON and output 1 will be fed by the battery
The power down sequence order is simply the opposite; first the AMP will shut down, then
each output from 4 to 1. This allows a very smooth power on and off of the system and should
avoid any annoying clicks in the speakers.

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Nagra –MPS
Nagra Modulometer
The Nagra Modulometer was inherited from the second recorder developed by
Nagra back in 1952, the Nagra II. The Modulometer is a precision modulation
meter that displays the necessary information to perform the best possible
recording.
Turn the modulometer selector to
display the desired information.
In the case of the MPS, the
Modulometer displays the following
information.
MAINS Will display the AC power voltage. Depending on your country, the
nominal voltage will be 100, 115 or 230 V.
The actual scales are 90-110 V, 100-130 V and 210-250 V. Should the voltage be
below minimum or above maximum, this should raise concerns about a mains
power problem in your area. The MPS only displays the voltage, it does not affect it.
BAT displays the battery level from 12 to 17 V. The output level of a fully
charged battery is 16.8 V. If the battery drops to around 13 V, the MPS will
automatically recharge it. If no battery is present, the needle will remain on the
far left of the meter.
1, 2, 3, 4 positions will display the actual output level of the corresponding DC
output. The nominal level is 12.3 V, so the needle is a little bit above 12 V (as
shown in the picture). Should the voltage be significantly different, please contact
your dealer for support.
LED and Modulometer intensity adjustment
This two-way toggle switch allows you to adjust the LED and
Modulometer backlight intensity. Pushing the toggle UP will increase
the intensity, pushing it down will lower the intensity all the way to
complete extinction. There are 7 different levels.

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Nagra –MPS
Remote control
Factory settings for the remote control
The Nagra MPS is factory set to be device number 6 with Nagra remote control
code.
Changing device number (for dealers)
If you wish to use another
device number, turn the MPS
Off and unplug the mains
cable. Then open the top
plate. The selector is on the
front panel board, on the
right-hand side.
(the picture shows an MPS
equipped with the optional
battery)
0position is for Philips RC 5
format –1to 6is to use
Nagra RCU and RCU II device number, simply turn the selector to the number
you wish the MPS to respond to.
Using a “universal remote” with the MPS
Place the selector shown above on the 0position. The MPS will respond to IR
signals coded in Philips RC-5 format. The MPS is allocated a system number 7 for
“Reserved”. Function 12 “Standby” is available to turn the unit On and Off.

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Nagra –MPS
MPS with battery option
The optional battery allows you to supply clean and quiet DC entirely from the
battery, isolated from the mains.
The MPS handles the battery entirely automatically.
The following table indicates the different status:
Main selector
position
BAT LED
status
Battery status
Output 1 voltage
source
ON
Blinking
Recharging
From the mains
ON
Off
Full charge reached
From the mains
BAT
On
Connected to Output 1
From the battery
BAT
Blinking
Recharging
From the mains
OFF
Blinking
Recharging
Off
OFF
Off
Full charge reached
Off
NB If the BAT position is selected yet the battery charge is too low, the MPS will
automatically begin to recharge. In this case, output 1 will be fed from the mains
and no longer from the battery.
Charging time and operation time
The charging time is estimated to be 8 hours, when the outputs are off.
If the battery is recharging while the MPS is turned on, charging time will be
longer.
When you turn the main selector to the OFF position, the MPS will still charge
the battery, however the mains switch (on the back panel) should be left in the
ON position (I).
Note that the PL-P is not compatible with the
MPS.
If you connect a BPS in parallel to one device,
the operating time on the battery will be
slightly reduced.
Device
Operation
time (hours)
CDC
11
Jazz
8
Melody
49
PL-L
7.5
VPS
6.5
BPS
98

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Nagra –MPS
Starting the MPS using the trigger input REM
On the Rposition, you can start the MPS using
the REM (for REMote) input.
Please note that both the tip and the sleeve of
the 1/8” Jack should be connected to the ground.
Signal on the ring
MPS
Connected to the ground
Off
Open or connected to max 12 V rms
On
Note, in this case, in the ON position, the MPS does not run on battery. If you
wish to use the battery, you need to turn the main selector to BAT.
Whenever you connect a jack on the REM connector, it will override the IR remote
control.
Using the trigger output AMP
See the following picture for cabling of the
1/8” jack.
MPS
Tip and ring
AMP On
Connected
AMP Off
Open
The AMP will be activated at the end of the powering sequence, to avoid any
clicks that sometimes occur at start-up. When powering down, the amplifier will
be turn off first.
You can of course connect any other compatible equipment, not only amplifiers.
Case cleaning
Clean the MPS casing using a soft, non-fluffy, slightly damp cloth. Do not use any
cleaning products which could have a corrosive effect.

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Nagra –MPS
Technical specifications
Compatibility
Nagra PL-L, VPS, BPS,
Jazz, Melody
preamplifiers
Nagra CD players
Output type
1 to 4, 12 V DC, 1 A
Lemo connector
BPS output
9 V, 100 mA
Or 12 V by selector
Linear noise
100 μV maximum
10 Hz - 300 kHz
Linear noise
(BPS output)
150 μV maximum
10 Hz - 300 kHz
Home automation
input, output
3.5 mm jack connectors
output switching by relay
Battery module
capacity
6.75 AH
Optional
Mains power
100, 115 or 230 VAC
±10%
Power consumption
Maximum 60 W
In standby < 10 mW
Dimensions
277 x 268 x 73 mm
Excluding connectors
L x W x H
10.9 x 10.6 x 2.9 inches
Excluding connectors
Weight
4.9 Kg (10.8 lbs.)
Without battery
5.6 Kg (12.3 lbs.)
With battery
Specifications may change without notice

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Nagra –MPS
Déclaration de conformité CE
CE Declaration of conformity
FABRICANT: AUDIO TECHNOLOGY SWITZERLAND SA, 1032 Romanel, SUISSE
MANUFACTURER: AUDIO TECHNOLOGY SWITZERLAND SA, 1032 Romanel,
SWITZERLAND
APPAREIL: Nagra MPS
MODEL: Nagra MPS
NORMES APPLICABLES:
APPLICABLE NORMS:
Champ électromagnétique rayonné EN 55022 Cl. B
Radiated electromagnetic field EN 55022 Cl. B
Perturbations conduites sur secteur EN 55022 Cl. B
Disturbance voltage on mains terminal EN 55022 Cl. B
Immunité aux champs électromagnétiques EN 61000-4-3
Immunity to electromagnetic fields EN 61000-4-3
Immunité aux décharges électrostatiques EN 61000-4-2
Immunity to electrostatic discharges EN 61000-4-2
Immunité aux transitoires électriques rapides
en salves sur câble d’alimentation EN 61000-4-4 level 2 (1000V)
Immunity to burst on mains line EN 61000-4-4 level 2 (1000V)
Immunité aux transitoires électriques rapides
en salves sur câbles d’entrées/sorties EN 61000-4-4 level 1 (500V)
Immunity to burst on input/output signal line EN 61000-4-4 level 1 (500V)
Immunité aux ondes de choc EN 61000-4-5 level 2 (1000V)
Immunity to surge EN 61000-4-5 level 2 (1000V)
Romanel sur Lausanne 3ème trimestre 2013
Romanel sur Lausanne 3rd quarter 2013
Nagra R&D team