Caen ELS PS1112S User manual

PS1112S
[email protected] Low-Noise
Power Supply
User’s Manual
All Rights Reserved
© CAEN ELS s.r.l.
Rev. 1.5 –November 2022
LOW-NOISE FIXED VOLTAGE AC/DC

CAEN ELS s.r.l.
c/o AREA Science Park
S.S. 14 km 163,5 –34149 Basovizza (TS)
Italy
Mail: [email protected]
Web: www.caenels.com
Registered office: via Vetraia 11, 55049 –Viareggio (LU) - Italy

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Table Of Contents
1. INTRODUCTION..............................................................................................10
1.1 THE PS1112S POWER SUPPLY......................................................................10
1.2 THE PS1112S AT A GLANCE .........................................................................11
1.3 TECHNICAL DATA.........................................................................................12
2. SAFETY..............................................................................................................13
2.1 INJURY PRECAUTIONS...................................................................................13
2.2 CAUTION.......................................................................................................13
2.3 INPUT RATINGS.............................................................................................14
2.4 LIVE CIRCUITS ..............................................................................................14
2.5 PART REPLACEMENT AND MODIFICATIONS ..................................................14
3. I/O CONNECTORS...........................................................................................15
3.1 AC LINE INPUT CONNECTOR ........................................................................15
3.2 OUTPUT ........................................................................................................16
3.3 STATUS LED.................................................................................................17
3.4 FIXING ..........................................................................................................17
3.5 MOUNTING POSITION ....................................................................................18
4. TECHNICAL SPECIFICATIONS ..................................................................20
5. MECHANICAL DIMENSIONS.......................................................................21
6. OUTPUT CURRENT DERATING..................................................................22
7. ORDERING CODES.........................................................................................23

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Document Revisions
Document Revision
Date
Comment
1.0
October 24th, 2014
First Release
1.1
October 29th, 2014
Manual graphics changed
1.2
December 2nd, 2014
Updated the pin-out of the
Output DC connector to match
the names used in the datasheet
1.3
December 30nd, 2014
Updated ordering option Table
1.4
October 14th, 2020
Data correction on maximum
output power
1.5
November 22nd, 2022
Added UKCA compliance logo

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Safety information - Warnings
CAEN ELS will repair or replace any product within the guarantee period if
the Guarantor declares that the product is defective due to workmanship or materials
and has not been caused by mishandling, negligence on behalf of the User, accident or
any abnormal conditions or operations.
Please read carefully the manual before operating any part of the instrument
WARNING
High voltage inside, do NOT open the boxes
CAEN ELS d.o.o. declines all responsibility for damages or injuries
caused by an improper use of the Modules due to negligence on behalf of the
User. It is strongly recommended to read thoroughly this User's Manual before
any kind of operation.
CAEN ELS d.o.o. reserves the right to change partially or entirely the contents of this
Manual at any time and without giving any notice.
Disposal of the Product
The product must never be dumped in the Municipal Waste. Please check your local
regulations for disposal of electronics products.

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Read over the instruction manual carefully before using the instrument.
The following precautions should be strictly observed before using the PS1112S:
WARNING
•Do not use this product in any manner not
specified by the manufacturer. The protective
features of this product may be impaired if it is
used in a manner not specified in this manual.
•Do not use the device if it is damaged. Before
you use the device, inspect the instrument for
possible cracks or breaks before each use.
•Do not operate the device around explosives gas,
vapor or dust.
•Always use the device with the cables provided.
•Turn off the device before establishing any
connection.
•Do not operate the device with the cover
removed or loosened.
•Do not install substitute parts or perform any
unauthorized modification to the product.
•Return the product to the manufacturer for
service and repair to ensure that safety features
are maintained
CAUTION
•This device is designed for indoor use and in
area with low condensation.

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The following table shows the general environmental requirements for a correct
operation of the instrument:
Environmental Conditions
Requirements
Operating Temperature
0°C to 50°C
Operating Humidity
30% to 85% RH (non-condensing)
Storage Temperature
-10°C to 60°C
Storage Humidity
5% to 90% RH (non-condensing)

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1.Introduction
This chapter describes the general characteristics and main features of the
PS1112S low-noise power supply.
1.1 The PS1112S Power Supply
CAEN ELS PS1112S is a single-output +12V mixed switching-linear power
supply that is designed in order to obtain low-noise operation and high efficiency and
it is especially suited for measurement systems where switching power supplies could
corrupt measuring noise, accuracy and precision.
The power supply is housed in a robust and compact stainless-steel box that can
be placed next to the supplied device in order to reduce cable lengths and minimize
consequent possible noise pick-up.
These power supplies are particularly designed for operation with the following
CAEN ELS devices:
•TetrAMM Picoammeter
•PreDAC
All the above cited devices, combined with a PS1112S low-noise voltage power
supply, guarantee their rated specifications.

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1.2 The PS1112S at a Glance
The PS1112S linear power supply and its I/Os are represented in Figure 1:
Figure 1: overall view of a PS1112S power supply
The PS1112S is an isolated power supply, with a 3-pole output connector,
specifically designed to supply low current and precision instrumentation.
The AC Power Line input is placed on the left side of the box while the output
connectors on the right side; LED monitor (indicating the presence of the output
voltage) is placed on the front side.
The PS1112S has a standard +12V output voltage, as indicated in the
following Table 1:
Positive Output
Voltage
PS1112S
+12 V; 1.2A
Table 1: output voltage and current values
Output DC
AC Line Input
“Power Good”
LEDs monitor

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1.3 Technical Data
The PS1112S power supply has an output voltage accuracy of ±3% - i.e. from 11.64
V to 12.36 V.
Maximum peak-to-peak voltage noise measured at the device output terminals
is rated at 4 mV. This value is measured over a 1 MHz bandwidth using a LeCroy
MSO 44MXs-B, 400MHz, 5GS/s with AC Coupling at full load. A typical output
waveform used to estimate the peak to peak noise value is shown in Figure 2.
Figure 2: typical output noise - AC coupling
The PS1112S outputs are floating respect Earth up to 500V, protected against
short-circuit and from over-voltage.

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2.Safety
2.1 Injury Precautions
Prior to shipment this system was inspected and found free of mechanical or
electrical defects. Upon unpacking of the system, inspect for any damage, which may
have occurred in transit. The inspection should confirm that there is no exterior
damage to the system such as broken connectors.
This section contains the fundamental safety rules for the installation and
operation of the system. Read thoroughly this section before starting any procedure of
installation or operation.
2.2 Caution
The following safety precautions must be observed during all phases of
operation, service and repair of this equipment. Failure to comply with the safety
precautions or warnings in this document violates safety standards of design,
manufacture and intended use of this equipment and may impair the built-in
protections within.
CAEN ELS d.o.o. shall not be liable for user’s failure to comply with these
requirements.
To avoid electrical shock or fire hazard, do not apply a power to a load that is
outside the rated conditions.
Do Not Operate Without Covers.
To avoid electric shock or fire hazard, do not operate this product with covers or
panels removed.
Do Not Operate in Wet/Damp Conditions.
To avoid electrical shock, do not operate this product in wet or damp conditions.
Do Not Operate in an Explosive Atmosphere.
To avoid injury or fire hazard, do not operate this product in an explosive
atmosphere.
Do Not Operate With Suspected Failures.

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If you suspect there is damage to this product, have it inspected by qualified service
personnel.
2.3 Input Ratings
Do not use AC supply which is outside the limits for the input voltage and
frequency ratings of this instrument. For input voltage and frequency rating of the
module see Table 3. For safety reasons, the mains supply voltage fluctuations should
not exceed above voltage range.
2.4 Live Circuits
No internal adjustment or component replacement is allowed to non-CAEN
ELS d.o.o. personnel. Never replace components with power cables connected.
In order to avoid injuries, always disconnect power plugs, let circuits
discharge and remove external voltage source before touching components (wait 10
min at least).
2.5 Part Replacement and Modifications
Parts substitutions and modifications are allowed by authorized CAEN ELS
d.o.o. service personnel only.

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3.I/O Connectors
This chapter describes the I/O connectors, their corresponding pinout and their
functionality.
3.1 AC Line Input Connector
The AC Line Input connector is in a standard IEC Male Socket as shown in
Figure 3.
The PS1112S power supply is designed for universal AC input voltage range
since it can operate with voltage from 90V to 260V and input frequency from 47 to 63
Hz. Under the value of 115V AC Mains input the Power Supply is subject to current
(i.e. power) de-rating. See Output Current Derating chapter for further details.
Figure 3: AC Line input connector

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3.2 Output
Output DC voltage is made available through a 3-pole connector with a screw
locking. The pin-out of the connector (frontal view) is shown in Figure 4.
Figure 4: Output DC Connector (TE 1838839-1)
The output connector has the following pin-out:
Pin #
PS1112S
1
+12V
3
nc
4
GND
Table 2: PS1112S output D connector pin-out
In the same package of the power supply PS1112S there is also a mating un-
terminated cable that can be terminated with the desired connector.
Pin #1
Pin #4
Pin #3

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3.3 Status LED
On a lateral side of the power supply, two LEDs turn off whenever the +12V is
not correctly regulated on the output cable.
Figure 5: LED indicators for output voltage
3.4 Fixing
On the bottom side of the PS1112S four threaded M3×4mm holes can be used
for fixing the power supply. These are indicated in the following Figure 6.
Figure 6: Threaded holes position on the PS1112S bottom
+12V "Power Good” LED

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3.5 Mounting position
PS1112S shall NOT be mounted in the two following positions:
•bottom side of the box fixed to the celling (Figure 7);
•lateral side of the box that present ten ventilation holes faced to the top
(Figure 8).
The RECOMMENDED mounting positions for increasing the heat dissipation
and increasing reliability and life-time are:
•bottom side of the box fixed to the floor;
•lateral side of the box that present twenty ventilation holes faced to the
top.
Figure 7: Ceiling mounting NOT allowed

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Figure 8: Lateral mounting (ten ventilation holes faced to the top) NOT
allowed

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4.Technical Specifications
Technical Specifications for the PS1112S linear power supplies are presented
in the following Table 3.
Technical Specifications
PS1112S
Output Voltage (±3%)
+12 V
Maximum Output Power
14.4 W
Maximum Output Current
+12V @ 1.2 A
Output Ripple + Noise
0.003% RMS @ DC-1MHz
0.025% P-P @ DC-1MHz
AC Line Voltage Input
90 –260 VAC
AC Line Frequency
47 - 63 Hz
Input to Output Isolation
3kV
Output to Earth-Case Isolation
500V
Hold-up time
16 ms typ. at 115 VAC
Cooling
Natural convection
Dimensions
136.4 × 41 × 90.7 mm
Weight
600 g
Y-Cable length (CT-I and CT-V)
3m
Indicators
1 LED (Power Good)
Protections
Output short-circuit
Output over-voltage
Operating Temperature Range
0°C –50°C
Table 3: PS1112S power supply main specifications