¸HMP Series
Power supply
User Manual
Version 02
User Manual
Test & Measurement
General remarks regarding the CE marking
General Information Regarding the CE Marking
ROHDE & SCHWARZ measuring instruments comply with
regulations of the EMC Directive. ROHDE & SCHWARZ is
basing the conformity assessment on prevailing generic
and product standards. In cases with potentially different
thresholds, ROHDE & SCHWARZ instruments apply more
rigorous test conditions. Thresholds for business and commercial sectors as well as small business are applicable
for interference emission (class 1B). As to the interference
immunity, the standard thresholds for the industrial sector apply. Measurement and data lines connected to the
measuring instrument significantly affect compliance with
specified thresholds. Depending on the respective application, utilized lines may differ. In regards to interference
emission and immunity during measurements, it is critical
that the following terms and conditions are observed:
the CE
1. Data Cables
It is imperative to only use properly shielded cables when
connecting measuring instruments and interfaces to
external devices (printers, computers, etc.). Unless the
manual prescribes an even shorter maximum cable length,
data cables (input/output, signal/control) may not exceed
a length of 3m and may not be used outside of buildings.
If the instrument interface includes multiple ports for interface cables, only one cable at a time may be connected.
Generally, interconnections require double-shielded connecting cables. The double-shielded cable HZ72 (available
at ROHDE & SCHWARZ) is well suitable as IEEE bus cable.
2. Signal Cables
In general, measuring cables for the transmission of signals between measuring point and measuring instrument
should be kept as short as possible. Unless the manual
prescribes an even shorter maximum cable length, signal
cables (input/output, signal/control) may not exceed a
length of 1m and may not be used outside of buil-dings.
In general, all signal cables must be used as shielded conductors (coaxial cable- RG58/U). It is important to ensure
proper ground connection. Signal generators require the
use of double-shielded coaxial cables (RG223/U, RG214/U).
3. Impact on Instruments
General remarks regarding the CE marking
If strong high-frequency electric and magnetic fields are
present, it may occur despite diligent measurement setup
that unwanted signal units are injected into the instrument
via connected cables and lines. This does not result in
destruction or shutdown of ROHDE & SCHWARZ instruments. In individual cases, external circumstances may
cause minor variations in the display and measuring values
beyond the selected specifications.
Important Notes. . . . . . . . . . . . . . . . . . . . . . . . 28
1.1Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
1.2Unpacking. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
1.3 Setting Up the Instrument. . . . . . . . . . . . . . . . . . . . 28
1.4 Transport and Storage . . . . . . . . . . . . . . . . . . . . . . . 28
1.5 Safety Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . 28
1.6 Intended Operation . . . . . . . . . . . . . . . . . . . . . . . . . 29
1.7 Ambient Conditions . . . . . . . . . . . . . . . . . . . . . . . . . 29
1.8Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
1.9 Warranty and Repair. . . . . . . . . . . . . . . . . . . . . . . . . 29
1.10Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
1.11 Measurement Categories. . . . . . . . . . . . . . . . . . . . . 30
1.12 Switching the Mains Voltage and
Replacing a Fuse. . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
1.13 Batteries and Rechargeable Batteries/Cells. . . . . . . 31
1.14 Product Disposal. . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Description of the Operating Elements. . . . . . 32
Brief Description . . . . . . . . . . . . . . . . . . . . . . . 34
Operating the R&S®HMP Series. . . . . . . . . . . . 35
Operating the Instrument. . . . . . . . . . . . . . . . . . . . . 35
Selecting the Channels. . . . . . . . . . . . . . . . . . . . . . . 35
Selecting the Output Voltage. . . . . . . . . . . . . . . . . . 35
Adjustable Maximum Values. . . . . . . . . . . . . . . . . . 35
Setting the Current Limit . . . . . . . . . . . . . . . . . . . . . 36
Activating the Channels. . . . . . . . . . . . . . . . . . . . . . 36
Advanced Operating Functions . . . . . . . . . . . . 37
Storing / Recalling of Settings
(STORE / RECALL) . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Tracking Function . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Menu Options (MENU Key) . . . . . . . . . . . . . . . . . . . 37
Remote Control . . . . . . . . . . . . . . . . . . . . . . . . 40
6.1RS-232. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
6.2USB. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
6.3 Ethernet (Option HO730/HO732). . . . . . . . . . . . . . . 40
6.4 IEEE 488.2 / GPIB (Option HO740). . . . . . . . . . . . . . 42
Advanced Applications . . . . . . . . . . . . . . . . . . 43
Compensating for Voltage Drops on the Supply Lines
(Sense Mode). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Parallel and Serial Mode. . . . . . . . . . . . . . . . . . . . . . 43
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . 44
9Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
9.1 List of figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
9.2Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Important Notes
1 Important Notes
Symbol 1: Caution - Observe operating instructions
Symbol 2: Caution High Voltage
Symbol 3: Ground
Symbol 4: Ground terminal
While unpacking, check the package contents for completeness (measuring instrument, power cable, product
CD, possibly optional accessories). After unpacking, check
the instrument for mechanical damage occurred during
transport and for loose parts inside. In case of transport
damage, please inform the supplier immediately. The
instrument must not be operated in this case.
1.3 Setting Up the Instrument
Fig. 1
Fig. 2
Fig. 3
The instrument can be set up in two different positions:
The front support feet are mounted as shown in fig. 1. The
front panel of the instrument points slightly upwards (at an
angle of approximately 10°). If the front support feet are
collapsed (see fig. 2), it is possible to securely stack the
instrument with other ROHDE & SCHWARZ instruments.
If multiple instruments are stacked, the collapsed support
feet are positioned in the locking mechanism of the instrument beneath, preventing unintended movement (see
fig. 3). Be sure to never stack more than three measuring
instruments as an exceedingly high instrument stack may
become instable. Additionally, operating all instruments
simultaneously may generate too much heat.
1.4 Transport and Storage
Please keep the original packaging for possible shipping at
a later point. Damage during transport due to inappropriate
packaging is excluded from the warranty. The instrument
must be stored in dry, closed indoor premises. If the instrument was transported under extreme temperatures, it
is advisable to allow a minimum of two hours to reach the
appropriate temperature before operating the instrument.
1.5 Safety Instructions
This instrument was built in compliance with VDE0411 part
1, safety regulations for electrical measuring instruments,
control units and laboratory equipment. It has been tested
and shipped from the plant in safe condition. It is in
compliance with the regulations of the European standard
EN 61010-1 and the international standard IEC 61010-1. To
maintain this condition and to ensure safe operation, the
user must observe all instructions and warnings given in
this operating manual. According to the regulations of
protection class 1, all casing and chassis parts are connected to the protective earth conductor during operation.
It is prohibited to disconnect the earthed protective
connection inside or outside the instrument!
If uncertainty exists about the function or safety of the
power sockets, the outlets must be examined in accordance with DIN VDE 0100, part 610.
❙❙ The available mains voltage must correspond to the
values specified on the instrument label.
❙❙ The instrument may only be opened by fully trained
❙❙ Prior to opening, the instrument must be turned off and
isolated from all circuits.
In the following cases, remove the instrument from operation and secure it against unintentional operation:
❙❙ Visible damage to the instrument
❙❙ Cable damage
❙❙ Fuse holder damage
❙❙ Loose parts in the instrument
❙❙ The instrument is no longer working
❙❙ After an extended period of storage under unfavorable
conditions (e.g. outdoors or in damp rooms)
❙❙ Rough handling during shipment.
Exceeding the Low Voltage Protection!
For the series connection of all output voltages, it is possible to exceed the low voltage protection of 42 V. Please
note that in this case any contact with live components
is life-threatening. It is assumed that only qualified and
trained personnel service the power supplies and the
connected loads.
Prior to switching on the product, it must be ensured that
the nominal voltage setting on the product matches the
nominal voltage of the AC supply network. If it is necessary to set a different voltage, the power fuse of the product may have to be changed accordingly.
Important Notes
1.6 Intended Operation
The measuring instrument is intended only for use by
personnel familiar with the potential risks of measuring
electrical quantities. For safety reasons, the measuring
instrument may only be connected to properly installed
safety socket outlets. Separating the grounds is prohibited.
The power plug must be inserted before signal circuits
may be connected.
Use the measuring instrument only with original ROHDE &
SCHWARZ measuring equipment, measuring cables and power
cord. Never use inadequately measured power cords. Before
each measurement, measuring cables must be inspected for
damage and replaced if necessary. Damaged or worn components can damage the instrument or cause injury.
The product may be operated only under the operating
conditions and in the positions specified by the manufacturer, without the product's ventilation being obstructed.
If the manufacturer's specifications are not observed, this
can result in electric shock, fire and/or serious personal injury, and in some cases, death. Applicable local or national
safety regulations and rules for the prevention of accidents
must be observed in all work performed.
The measuring instrument is designed for use in the following sectors: Industry, residential, business and commercial areas and small businesses.
The measuring instrument is designed for indoor use only.
Before each measurement, you need to verify at a known
source if the measuring instrument functions properly.
To disconnect from the mains, the low-heat device socket on the
back panel has to be unplugged.
1.7 Ambient Conditions
Permissible operating temperatures during the operations
range from +5 °C to +40 °C. During storage or transportation the temperature may be between –20 °C and +70 °C.
In case of condensation during transportation or storage
, the instrument will require approximately two hours to
dry and reach the appropriate temperature. It can then be
operated. The measuring instrument is designed for use in
a clean and dry indoor environment. Do not operate with
high dust and humidity levels, if danger of explosion exists
or with aggressive chemical agents. Any operating position may be used; however adequate air circulation must
be maintained. For continuous operation, a horizontal or
inclined position (integrated stand) is preferable.
The maximum operating altitude for the instrument is 2000
m. Nominal data with tolerance details apply once the ambient temperature of 23 °C has been reached after about
30 minutes. Values without tolerance details are reference
values of an average instrument.
Do not obstruct the ventilation holes!
1.8 Cooling
The heat produced inside the power supply is guided
to the exterior via temperature-controlled fan. This fan,
combined with a cooling element, is located in a "cooling
duct" which is positioned across the instrument. The air is
drawn at the left side and exhausted at the right side of the
instrument. This helps minimize the dust exposure to the
instrument as much as possible. However, it is necessary
to ensure that there is sufficient space on both instrument
sides for the heat exchange. If the temperature inside the
instrument still increases to more than 80°C, a channelspecific overheat protection intervenes. Affected outputs
will automatically be switched off.
1.9 Warranty and Repair
ROHDE & SCHWARZ instruments are subject to strict
quality controls. Prior to leaving the manufacturing site,
each instrument undergoes a 10-hour burn-in test. This is
followed by extensive functional quality testing to examine
all operating modes and to guarantee compliance with the
specified technical data. The testing is performed with testing equipment that is calibrated to national standards. The
statutory warranty provisions shall be governed by the laws
of the country in which the ¸ product was purchased.
In case of any complaints, please contact your supplier.
The product may only be opened by authorized and
qualified personnel. Prior to working on the product or
before the product is opened, it must be disconnected
from the AC supply network. Otherwise, personnel will
be exposed to the risk of an electric shock.
Any adjustments, replacements of parts, maintenance
and repair may be carried out only by authorized ROHDE
& SCHWARZ technical personnel. Only original parts may
be used for replacing parts relevant to safety (e.g. power
switches, power transformers, fuses). A safety test must always be performed after parts relevant to safety have been
replaced (visual inspection, PE conductor test, insulation
resistance measurement, leakage current measurement,
functional test). This helps ensure the continued safety of
the product.
1.10 Maintenance
Clean the outer case of the measuring instrument at regular
intervals, using a soft, lint-free dust cloth.
The display may only be cleaned with water or an appropriate glass cleaner (not with alcohol or other cleaning
agents). Follow this step by rubbing the display down with
a dry, clean and lint-free cloth. Do not allow cleaning fluid
to enter the instrument. The use of other cleaning agents
may damage the labeling or plastic and lacquered surfaces.
Important Notes
Before cleaning the measuring instrument, please make sure that
it has been switched off and disconnected from all power supplies (e.g. AC supply network or battery).
No parts of the instruments may be cleaned with chemical cleaning agents (such as alcohol, acetone or cellulose thinner)!
1.11 Measurement Categories
This instrument is designed for measurements on circuits
that are only indirectly connected to the low voltage mains
or not connected at all. The instrument is not intended
for measurements within the measurement categories II,
III or IV; the maximum potential against earth generated
by the user must not exceed 150VDC (peak value) in this
application. The following information refers solely to user
safety. Other aspects, such as the maximum voltage, are
described in the technical data and must also be observed.
The measurement categories refer to transients that are
superimposed on the mains voltage. Transients are short,
very fast (steep) current and voltage variations which may
occur periodically and non-periodically. The level of potential transients increases as the distance to the source of
the low voltage installation decreases.
❙❙ Measurement CAT IV: Measurements at the source of
the low voltage installations (e.g. meters)
❙❙ Measurement CAT III: Measurements in building
installations (e.g. power distribution installations, power
switches, firmly installed sockets, firmly installed engines
❙❙ Measurement CAT II: Measurements on circuits
electronically directly connected to the mains (e.g.
household appliances, power tools, etc.)
❙❙ 0 (instruments without measured measurement
category): Other circuits that are not connected directly
to the mains.
1.12 Switching the Mains Voltage and
Replacing a Fuse
Switching the Mains Voltage
Prior to operating the instrument, please check if the
available mains voltage (115 V or 230 V) corresponds to
the value indicated on the voltage selector of the instrument. If this is not the case, the main voltage will need to
be switched. The voltage selector is located on the back of
the instrument (see figure).
unit. A fuse may only be replaced if the instrument has
been disconnected from the mains first and if the power
cable has been removed. The fuse holder and power cable
must be undamaged. Use a suitable screwdriver (with a
blade width of approximately 2 mm) to push the plastic
locking mechanisms to the left and right side of the fuse
holder inwards. The insertion point is marked by two
slanted guides on the casing. When unlocking the mechanism, the fuse holder will be pushed outwards by compression springs and it can then be removed. The fuses are
now accessible and can be removed as necessary.
When changing the mains voltage, it is essential to replace the
fuse. Otherwise the instrument may be destroyed.
Please note that the protruding contact springs must not
be deformed. It is only possible to insert the fuse holder if
the guide points toward the connector. The fuse holder will
be inserted against the spring pressure until both plastic
locking mechanisms lock into place.
It is hazardous and not permitted to repair a defective fuse or
to use other tools to bypass the fuse. Resulting damage to the
instrument are not covered by the warranty.
Fuse types:
Micro fuse 5 x 20 mm slow; 250 V~
IEC 60127-2/5; EN 60127-2/5
R&S®HMP2020 / R&S®HMP2030:
Mains voltage
Fuse nominal current
115 V
2 x 6 A
230 V
2 x 3.15 A
R&S®HMP4030 / R&S®HMP4040:
Mains voltage
Fuse nominal current
115 V
2 x 10 A
230 V
2 x 5 A
1.13 Batteries and Rechargeable Batteries/Cells
If the information regarding batteries and rechargeable batteries/cells is not observed either at all or to the extent necessary,
product users may be exposed to the risk of explosions, fire and/
or serious personal injury, and, in some cases, death. Batteries and rechargeable batteries with alkaline electrolytes (e.g.
lithium cells) must be handled in accordance with the EN 62133
1. Cells must not be disassembled, opened or crushed.
Fig. 1.1:
Voltage selector
for the R&S®HMP2030
Replacing a Fuse
The input line fuses are accessible externally. The integral
plug for a cooling unit and the fuse holder form a single
2. Cells and batteries may not be exposed to heat or fire.
Storage in direct sunlight must be avoided. Keep cells
and batteries clean and dry. Clean soiled connectors
using a dry, clean cloth.
3. Cells or batteries must not be short-circuited. Cells or
batteries must not be stored in a box or in a drawer
where they can short-circuit each other, or where they
Important Notes
can be short-circuited by other conductive materials.
Cells and batteries must not be removed from their
original packaging until they are ready to be used.
4. Keep cells and batteries out of reach of children. Seek
medical assistance immediately if a cell or battery was
5. Cells and batteries must not be exposed to any mechanical shocks that are stronger than permitted.
6. If a cell develops a leak, the fluid must not be allowed
to come into contact with the skin or eyes. If contact
occurs, wash the affected area with plenty of water
and seek medical assistance.
7. Improperly replacing or charging cells or batteries can
cause explosions. Replace cells or batteries only with
the matching type in order to ensure the safety of the
8. Cells and batteries must be recycled and kept separate
from residual waste. Cells and batteries must be recycled
and kept separate from residual waste. Rechargeable
batteries and normal batteries that contain lead, mercury
or cadmium are hazardous waste. Observe the national
regulations regarding waste disposal and recycling.
1.14 Product Disposal
Fig. 1.4: Product labeling in accordance
with EN 50419
The Electrical and Electronic Equipment Act implements
the following EG directives:
❙❙ 2002/96/EG (WEEE) for electrical and electronic
equipment waste and
❙❙ 2002/95/EG to restrict the use of certain hazardous
substances iin electronic equipment (RoHS directive).
Once its lifetime has ended, this product should be disposed of separately from your household waste. The disposal at municipal collection sites for electronic equipment
is also not permitted. As mandated for all manufacturers
by the Electrical and Electronic Equipment Act (ElektroG),
ROHDE & SCHWARZ assumes full responsibility for the
ecological disposal or the recycling at the end-of-life of
their products.
Please contact your local service partner to dispose of the
Description of the Operating Elements
2 Description of
the Operating
Front panel of R&S®HMP2030
(for the R&S®HMP2020, channel 3 is omitted)
1 POWER (key)
Power switch to switch the instrument on and off
2 Display (LCD): Parameter display
3 Arrow keys
Setting the parameters
4 Knob: for setting and confirming the nominal values
5 CURRENT (key illuminated)
Regulating the current setting
6 VOLTAGE (key illuminated)
Regulating the output voltage
7 CH1 (key illuminated)
Option key channel 1
8 FUSE (key illuminated)
Electronic fuse adjustable for each channel
9 TRACK (key illuminated)
Activating the tracking function
10 CH2 (key illuminated)
Option key channel 2
11 RECALL (key illuminated)
Loading stored measuring instrument configurations
12 STORE (key illuminated)
Storing measuring instrument configurations
13 CH3 (key illuminated)
Option key channel 3 (not available for the HMP2020)
14 REMOTE / LOCAL (key illuminated)
Switching between keypad and external
15 MENU (key illuminated)
Accessing the menu options
16 OUTPUT (key illuminated)
Selected channels may be switched on or off
17 Ground socket (4mm socket)
Reference potential connection (connected to protective earth)
18 SENSE (4mm safety sockets; 2 x per channel)
Compensating the line resistances
19 CH1 (4mm safety sockets)
Output channel 1; 0...32 V / 5 A
(HMP2020 0...32 V / 10 A)
20 CH2 (4mm safety sockets)
Output channel 2; 0...32 V / 5 A
21 CH3 (4mm safety sockets)
Output channel 3; 0...32 V / 5 A
(for the HMP2020, this channel is omitted)
Rear Panel of R&S®HMP2030
22 Interface
HO720 dual interface USB/RS-232
(included in delivery)
23 OUTPUT (plug connections)
Rear panel outputs for easy integration into rack
24 Voltage selector
Selecting the mains voltage 115 V or 230 V
25 Integral plug for a cooling unit with power fuses
Fig. 2.2: Rear panel of R&S®HMP2030
Fig. 2.1: Front panel of R&S®HMP2030
Description of the Operating Elements
16 18
15 17
Fig. 2.3: Front panel of R&S®HMP4040
Front Panel of R&S®HMP4040
(for the R&S®HMP4030, channel 4 is omitted)
1 POWER (key): Power switch to switch the instrument
on and off
2 Display (LCD): Parameter display
3 Arrow keys
Setting the parameters
4 Knob: for setting and confirming the nominal values
5 Numeric keypad (keys):
Setting the nominal values
6 CH1 (key illuminated: Option key channel 1
7 CH2 (key illuminated): Option key channel 2
8 Enter (key): Key to confirm values via keypad
9 CURRENT (key illuminated):
Regulating the current setting
10 CH3 (key illuminated): Option key channel 3
11 VOLTAGE (key illuminated):
Regulating the output voltage
12 MENU (key illuminated): Accessing the menu options
13 FUSE (key illuminated):
Electronic fuse adjustable for each channel
14 CH4 (key illuminated):
Option key channel 4 (not available for the HMP4030)
15 TRACK (key illuminated):
Activating the tracking function
16 REMOTE (key illuminated):
Switching between keypad and external control
17 RECALL (key illuminated):
Loading stored measuring instrument configurations
18 OUTPUT (key illuminated):
Selected channels may be switched on or off
19 STORE (key illuminated):
Storing measuring instrument configurations
20 Ground socket (4mm socket): Reference potential connection (connected to protective earth)
21 CH1 (4mm safety sockets):
Outputs channel 1; 0...32 V / 10 A
22 SENSE (4mm safety sockets; 2 x per channel):
Compensating the line resistances
23 CH2 (4mm safety sockets):
Outputs channel 1; 0...32 V / 10 A
24 CH3 (4mm safety sockets):
Outputs channel 3; 0...32 V / 10 A
25 CH4 (4mm safety sockets):
Outputs channel 4; 0...32 V / 10 A
(for the HMP4030, this channel is omitted)
Back Panel of R&S®HMP4040
26 Interface:
HO720 dual interface USB/RS-232 (included in delivery)
27 OUTPUT (plug connections):
Back panel outputs for easy integration into rack
28 Voltage selector:
Selecting the mains voltage 115 V or 230 V
29 Integral plug for a cooling unit with power fuses
Fig. 2.4: Rear panel of the HMP4040
Brief Description
3 Brief Description
have freely definable processes implemented for voltage
and current, with a timeframe as short as 10 ms. This can
be achieved manually by use of the internal EasyArb Editor
or via remote interface.
The programmable 2-, 3- or 4-channel high performance
power supplies are based on a classical transformer
concept with high efficiency electronic pre-regulators and
secondary linear regulators. This concept allows the instrument to achieve the high output power within a minimum
space, high efficiency and lowest residual ripple.
Fig. 3.3: Fuse Linking R&S®HMP2030 (top) / R&S®HMP4040 (bottom)
Fig. 3.1: R&S®R&S®HMP4030 (3-channel version)
Depending on the instrument type, up to 4 galvanically
isolated and hence combinable channels are available.
The R&S®HMP2030 includes three identical channels with
a continuous voltage range of 0 to 32 V that at up to 16 V
can be charged with 5 A and at 32 V with as much as 2.5 A
using the sophisticated power management. Just like the
R&S®HMP2030, the R&S®HMP2020 provides an output
power of 188 W; however, aside from the 5.5 V channel,
it only has a 32 V channel available to benefit the double
output power of up to 10 A. The R&S®HMP4030 includes
three identical channels with a continuous voltage range of
0 to 32 V that at up to 16 V can be charged with 10 A and at
32 V with as much as 5 A. Just like the R&S®HMP4030, the
R&S®HMP4040 provides an output power of 384 W (160W
per channel). Four identical 32 V channels are available.
All power supplies feature galvanically isolated, floating
overload and short-circuit proof outputs and may be
connected in series or in parallel, thus making very high
currents and voltages available. The minimum requirement
for this are individual electronic fuses (FuseLink) which can
be logically linked and which, according to user specifications, will switch off the interlinked channels (for instance,
CH1 follows CH2 and CH3 follows CH1 or CH2) in case an
error occurs.
R&S®HMP2020 and R&S®HMP2030 include a 2-line and
3-line LCD display (240 x 64 pixel. R&S®HMP4030 and
R&S®HMP4040 include a 3-line and 4-line LCD display
(240 x 128 pixel). The back panel of the instrument (see
fig. 3.4) includes additional connections for all cables
(including SENSE) to simplify the integration with 19‘‘ rack
systems. By default, a dual interface USB/RS-232 (HO720)
is included, and optionally, you can choose between a dual
interface Ethernet/USB or a GPIB interface (IEEE-488).
Fig. 3.4: R&S®HMP4040 terminal strip on the back panel of the instrument
Fig. 3.2: Example of an arbitrary function
The high adjustment and reverse resolution of up to
1 mV/0.1 mA (R&S®HMP4030/4040 1 mV/0.2 mA) is suitable
for applications with extremely high requirements. Additionally, the EasyArb function allows for all channels to
Operating the R&S®HMP Series
4 Operating the
R&S®HMP Series
wise, the instrument will automatically switch back after 5
seconds, without the changes taking effect (see chapter
5.3.7 Key Fallback Time). The nominal value of the output
voltage is increased by turning the knob to the right, and it
is decreased by turning it to the left. The voltage value is
selected individually for each channel.
4.1 Operating the Instrument
Prior to operating the instrument for the first time, please
be sure to observe the safety instructions mentioned previously!
For instance, if the display shows a voltage of 10.028 V (cursor on
the 3rd digit from the right), it is possible to press the knob to set
the digits to the right of the cursor to 0 (10.000 V)
Switch the instrument on by pressing the POWER key.
When switching the instrument on, the R&S®HMP power
will use the same operating mode that was in use at the
time the unit was last switched off. All instrument settings
(nominal values) are stored in a nonvolatile memory and
will be retrieved when switching the instrument on again.
By default, the output signals (OUTPUT) are switched off
at the beginning of operations. This is intended to prevent
a connected load from being serviced unintentionally
when switching the instrument on. The intent is also to
avoid destruction caused by an exceedingly high voltage
or power (due to previously stored instrument settings).
4.2 Selecting the Channels
To select a channel, press the corresponding channel
option key CH1, CH2, CH3 or CH4. If you press a channel option key, the channel LEDs is illuminated in green.
Subsequent settings refer to the selected channels. If none
of the channels have been selected, the LEDs will not be
illuminated. You should always first select the required
output voltage and the maximum required power before
activating the outputs by pressing the OUTPUT key (see
chapter 4.5 Activating the Channels). If the OUTPUT key
has been activated, the LED is illuminated in white.
4.4 Adjustable Maximum Values
R&S®HMP2020: For the R&S®HMP2020, CH1 and CH2
continuously provide 0 V to 32 V, where the output power
succeeds a power hyperbola (see fig. 4.6).
Fig. 4.1:
R&S®HMP2030: For the R&S®HMP2030, CH1, CH2 and
CH3 continuously provide 0 V to 32 V, where the output
power succeeds a power hyperbola (see fig. 4.6).
Fig. 4.2:
R&S®HMP4030: For the R&S®HMP4030, CH1, CH2 and
4.3 Selecting the Output Voltage
To select the output voltage, press the VOLTAGE key.
Then you can press the channel option key CH1, CH2,
CH3 or CH4 to activate the respective voltage setting for
the corresponding channel. If the VOLTAGE key has been
activated, the LED is illuminated in white. In addition, the
LED color for the corresponding channel changes to blue.
If you press the VOLTAGE (or CURRENT) key, the white
arrow key LEDs will also be illuminated. The nominal value
for the output voltage can be selected via knob and arrow keys. For the R&S®HMP4030 / HMP4040, the easiest
way to enter a value precisely and promptly is to use the
numeric keypad. Press the corresponding key to enter the
voltage value and confirm the selection by pressing the
ENTER key. Before confirming the value, you can delete
any value that has been entered incorrectly by pressing the
C key.
CH3 continuously provide 0 V to 32 V, where the output
power succeeds a power hyperbola (see fig. 4.6).
Fig. 4.3:
R&S®HMP4040: For the R&S®HMP4040, CH1, CH2, CH3
and CH4 continuously provide 0...32 V, where the output
power succeeds a power hyperbola (see fig. 4.6).
Fig. 4.4:
If you wish to select the channel voltage via knob, the
VOLTAGE key must be activated before you can select the
desired decimal point via arrow keys. Once the setting has
been completed, press the VOLTAGE key again. Other-
Operating the R&S®HMP Series
4.5 Setting the Current Limit
A current limit indicates that only a specific maximum
current Imax can flow. Prior to operating an experimental
circuit, this maximum value will be selected at the power
supply. The intent is to prevent damage to the experimental circuit in case an error occurs (e.g. a short circuit).
Voltage regulation
Current control
Fig. 4.5: Current limit
As the diagram shows, it remains true that Uout = Umax
will remain stable as long as the output current Iout < Imax
(voltage regulation). If the selected current value Imax is
exceeded, the current control (Constant Current operating
mode) is applied. This means that despite an increased
load, the value Imax can no longer increase. Instead, the
voltage Uout will decrease below the nominal value of
Umax. However, the current flow remains limited to Imax. If
the OUTPUT key and VOLTAGE key are activated and the
selected channel is changed, the blue LED of the respective channel will flash alternately in green (CV = Constant
Voltage) and red (CC = Constant Current), depending on
the operating mode.
After switching on the power (OUTPUT Off) the instrument
will always be in the constant voltage operating mode. The
maximum current Imax corresponds to the setting on the
CURRENT key. Once the CURRENT key has been activated,
the corresponding channel can be selected. The value is
selected via knob or arrow keys. The current is selected
individually for each channel. Once the setting has been
completed, press the CURRENT key again. Otherwise, the
instrument will automatically switch back after 5 seconds,
without the changes taking effect (see chapter 5.3.7 Key
Fallback Time). The combination of selected voltage and
selected current limit results in the following power hyperbola:
(2,5) 5
Fig. 4.6: (R&S®HMP2030) R&S®HMP2020/4030/4040 power hyperbola
According to the electrical basic formula for power P = U,
the following results for the maximum power per channel:
R&S®HMP2020: CH1 = 160 W, CH2 = 80 W (188 W max.)
R&S®HMP2030: 80 W per channel (188 W max.)
R&S®HMP4030: 160 W per channel (384 W max.)
R&S®HMP4040: 160 W per channel (384 W max.)
For instance, for the R&S®HMP2020 at 160 W per channel
for a 24 V voltage, this would result in a maximum current
of 6.67 A, and .3.33 A for the R&S®HMP2030.
To protect a connected, sensitive load even better, the
R&S®HMP series includes an electronic fuse. The FUSE
key allows the selection or deletion of fuses. For the fuse
selection the FUSE button will be activated (FUSE-LED will
be illuminated) before choosing the appropriate channel. If
the respective channels are selected with FUSE, the
channel LEDs will be illuminated in blue. Press the FUSE
key again to complete the setting for the electronic fuse.
Without any input, by default the instrument will switch
back after 5 seconds (see chapter 5.3.7 Key Fallback Time).
After the instrument has been switched back, the channel
LEDs will be illuminated in green again. In the display,
FUSE will be shown for each channel (see fig. 4.7).
Fig. 4.7:
appearance in
the display
4.5 Activating the Channels
For all ROHDE & SCHWARZ power supplies, the output
voltages can be switched on and off via key (OUTPUT).
The power supply itself remains switched on. This allows
you to con-veniently select the desired output parameters
up front and subsequently connect to the load via the
OUTPUT key. If the OUTPUT key is activated, the respective LED will be illuminated in white.
As a result of the inline regulator concept, naturally a capacity is required at the output to achieve ambitious goals
regarding Noise/Ripple. It required high technical complexity (for instance by means of internal current sink) to
reduce the screening capacity visible for the load to a minimum. To prevent unintended transient currents, please be
sure to deactivate the respective output before activating a
load, then connect the load and as a last step activate the
output. This allows you to implement an optimal transient
response when activating the output. Be sure to operate
highly sensitive semiconductors, such as laser diodes, only
as specified by the manufacturer.
Operating the R&S®HMP Series
5 Advanced Operating Functions
5.1 Storing / Recalling of Settings
The current settings for the measuring instrument can be
stored in a nonvolatile memory in memory locations 0 to
9 by pressing the STORE key. Use the knob to select the
respective memory location and press it again to confirm
the selection. The RECALL key allows you to reload the
settings. Use the knob again to select the settings. If the
STORE / RECALL key has been activated, the LED will be
illuminated in white.
5.2 Tracking Function
The tracking function allows you to interlink multiple
channels. It is possible to change both the voltage and the
current limit for the individual channels simultaneously
(see the 1-V position of 3 channels in fig. 5.1).
Fig. 5.1: 1-V
position for all
three channels
If the current for a channel exceeds the value Imax and
if the electronic fuse for this channel has been activated
via FUSE key (see Setting the Current Limit), all channels
interlinked with this channel will be switched off. If the
electronic fuse is triggered, the interlinked channels are
switched off; however, the OUTPUT key remains active. At
any given time, the outputs can be reactivated via corresponding channel option key. In case of any remaining
excess current, it will immediately be switched off again
Fig. 5.2 shows that exceeding the current limit at CH1 leads to
automatically having CH2 and CH3 switched off whereas an over
current in CH2 results in having CH3 deactivated.
Use the left arrow key to return to the previous menu level.
5.3.2 Fuse Delay
This menu item allows the selection of a so called Fuse
Delay between 0 ms to 250 ms. For instance, this prevents the fuse to be triggered in case of a capacitive load
The Fuse Delay function is only available when the channel is activated (Output On). This function is not activated in the regular
function mode.
The fuse delay can be changed via knob. You can select a
different channel by pressing the knob. Use the left arrow
key to return to the previous menu level.
To access the tracking mode, press the TRACK key. Then
you can select the individual channels. If you change the
voltage of one of these channels via knob or arrow keys,
press the VOLTAGE key to change the voltages of the
interlinked channels by the identical amount. The same
applies to the current and the usage of the CURRENT key.
During tracking, the R&S®HMP power supply retains the
previously selected voltage and current difference between the channels until a channel has reached the minimum or maximum value of the voltage or current. If the
TRACK key has been activated, the LED is illuminated in
white. This key remains activated until it is pressed again
(no automatic switch back after 5 sec).
Fig. 5.3: Setting
the Fuse Delay
5.3.3 Over Voltage Protection (OVP)
The so called OVP can be selected separately for each
channel. The over voltage protection is preset at the factory to 33 V; however, this may be reduced to match the
requirements of the respective application. If the voltage exceeds the preset value Umax, the output will be
switched off to protect the load. If the over voltage protection is active, OVP will flash in the display.
Fig. 5.4:
5.3 Menu Options (MENU Key)
5.3.1 FUSE Linking
The Fuse Linking function allows you to logically interlink channels with their electronic fuses. Use the knob to
choose the individual channels and press it to select or
deselect them. To return to the display screen, press the
MENU key again (no automatic switch back).
Fig. 5.2:
Fuse Linking
Over Voltage
With firmware version 2.0 and higher, two additional OVP
versions can be selected:
❙❙ measured and
❙❙ protected.
Individual menu items can be selected and changed by
pressing the knob. In the measured mode, the reference value from the instrument is considered as threshold
for the over voltage protection. In the protected mode,
the value set at the instrument is considered the threshold
for the over voltage protection. Use the left arrow key to
return to the previous menu level.
Advanced Operating Functions
5.3.4 Arbitrary
Activate the menu Arbitrary by pressing the knob. The
HMP series allows you to generate freely programmable
waveforms which can be reproduced within the limits set
by the instrument for voltage and current for the respective channel. The arbitrary function can be configured and
executed via control panel or external interface.
the arbitrary function. Pressing the OUTPUT key deactivates only the respective channel and does not stop the
function. This means that the arbitrary waveform continues internally. The option Clear Waveform allows you
to delete any previously made settings.
With firmware version 2.12 and higher, the output level remains
at the most recently selected value on the arbitrary signal!
Fig. 5.5:
For all practical purposes, each HMP channel has its
own arbitrary memory. This means that first an arbitrary
waveform is generated, then it is transmitted to the first
channel (followed by the second, third, etc. channel) and
finally, the arbitrary waveform of the respective channel is
started. In other words, a waveform is generated for channel 1, then for channel 2 etc. (including a delay of approximately 100 ms at the start). Nevertheless, it is very difficult
to implement a simultaneous start/end phase for multiple
waveforms as a certain delay always occurs between
these waveforms. This hampers calculations as these delays are dependent on the execution of remote commands,
the transfer between the interface and the instrument as
well as the process software. Therefore, it is impossible to
synchronize all arbitrary waveforms. The arbitrary function
was developed for individual channels and is not intended
to function comprehensively across all channels. Nonetheless, the individual arbitrary waveforms should only slightly
deviate from each other.
Use the menu item Edit Waveform to edit the parameters for the freely programmable waveform. The base
data for voltage, current and time (duration per point) are
required for this purpose. The appropriate base data allow
you to generate any of the common waveforms (step function, saw tooth, sine, etc.).
Use Save Waveform to save up to 3 settings (waveforms) which can be recalled by using the Recall Waveform option. To confirm the respective memory, press
the knob. To load the memory, apply the same steps. Use
the left arrow key to return to the previous menu level.
Example of an Arbitrary Signal (R&S®HMP2030):
Alternatively, you can also use the EasyArb software
module of the HMExplorer software to create an arbitrary
file. This allows you to create each point of a waveform by
use of the editor. You can add or delete individual points by
using the “+“ or “–“ function.
Fig. 5.6: Arbitrary-Editor
example (excerpt) HMExplorer
Once all arbitrary points have been created, the created
signal can be transferred to the instrument via interface by
using the menu item TRANSFER. The menu Transfer
opens and allows you to select the respective R&S®HMP
channel and the repetitions. Additionally, you can activate
the output to issue the signal at the output and to view it
on an oscilloscope, for instance (see fig. 5.8).
It is possible to repeat 128 specified points (index of
0...128). The repetition rate is at a maximum of 255 repetitions. If the repetition rate (Repetitions) is set to “000“, the
A signal with three specified points can only be issued by an AD
converter as a staircase curve. To issue it as a sawtooth signal,
additional specified points are required.
To display complex voltage sequences through the available 128
specified points and the minimum delay of 10ms, the R&S®HMP
is suitable to only a limited extent.
arbitrary function will be repeated infinitely. Use the knob
to set the values and press it to confirm your selections
(alternatively, you can use the right arrow key to confirm).
Use Transfer Waveform to transfer the set data to
the selected channel and select Start Waveform and press
the OUTPUT key to create the set data at the respective
output. The display indicates that the values set in Edit
Waveform are repeated. Use Stop Waveform to end
Fig. 5.7: Output arbitrary example on an oscilloscope
For more information about the EasyArb software module,
please refer to the HMExplorer software manual which can
be found in the software ZIP file as PDF document.
Advanced Operating Functions
5.3.5 Interface
Activate the menu Interface by pressing the knob. In
this menu, the following settings for the various interfaces
can be selected:
❙❙ the dual interface HO720 USB/RS-232 (baud rate,
number of stop bits, parity, handshake On/Off),
❙❙ LAN interface HO730/HO732 (IP address, sub net mask
etc. see manual HO730/HO732) and
❙❙ the IEEE-488 GPIB interface HO740 (GPIB address).
The use of the LAN interface HO730 requires a delay of a minimum of 2 ms between two commands!
Select Interface allows you to select the respective
interface via knob. The selection is indicated by a check
mark. Additionally, under Information the active interface will be displayed in brackets [ ]. For more information
about interfaces, please see chapter 6 or the respective
manuals at www.hameg.com. Use the left arrow key to
return to the previous menu level.
5.3.6 Key Brightness (only R&S®HMP2020/2030)
Activate the menu Key Brightness by pressing the
knob. This menu item allows you to regulate the intensity
of the key illumination via knob. Use the left arrow key to
return to the previous menu level.
5.3.7 Key Fallback Time
Activate the menu Key Fallback Time by pressing the
knob. The so called Key Fallback Time can be set to 5s or
10s via knob. In addition, it is possible to switch off the
automatic switching back (Off). The selection is indicated
by a check mark. Use the left arrow key to return to the
previous menu level.
(Off). The selection is indicated by a check mark. Press any
key to return to the regular operating mode.
5.3.11 Beeper
Activate the menu Beeper by pressing the knob. This
menu allows you to activate or deactivate the noise issued
by the keys. In addition, the HMP series offers the option
to issue a signal only in case an error occurs. This can also
be activated or deactivated at this point. Use the left arrow
key to return to the previous menu level.
Fig. 5.9: Beeper
5.3.12 Information
Activate the menu Information by pressing the knob.
This includes instrument information such as type classification, firmware version and version of the channel
firmware. Use the left arrow key to return to the previous
menu level.
If all the channels do not have the same firmware, a firmware
update will be required.
5.3.13 Reset Device
Activate the menu Reset Device by pressing the knob.
This menu item allows you to reset the instrument to its
original condition (factory settings). All selected instrument
settings will be erased.
Fig. 5.8: Key
Fallback Time
5.3.8 Display Contrast
Activate the menu Display Contrast by pressing the
knob. This menu item allows you to regulate the display
contrast via knob. Use the left arrow key to return to the
previous menu level.
5.3.9 Display & Key Brightness
(only R&S®HMP4030/4040)
This menu item allows you to regulate the intensity of the
key and display illumination via knob.
5.3.10 B
rightness Fallback Time
(only R&S®HMP4030/4040)
This menu item allows you to select the so called Brightness Fallback Time. If no instrument settings are
performed on the front panel for some time, the intensity
of the display and keys will automatically be reduced. The
Fallback Time can be set to 30 min. or 120 min. via knob.
In addition, it is possible to switch off the Fallback Time
Advanced Operating Functions
6 Remote Control
By default, the R&S®HMP series includes a HO720 USB/
RS-232 interface. You can find the drivers for this interface
on the product CD enclosed with the power supply or on
the ROHDE & SCHWARZ Homepage.
The LED for the remote key is illuminated in white (=
active), if communication to the instrument has been
established via interface (Remote Control). To return to the
local operating mode (Local Control), press the remote key
again, provided that the instrument has not been locked
out from local operation via interface (Local lockout). If local operation is locked, the instrument cannot be operated
via front panel keys. With firmware version version 2.0 and
higher, it is also possible to use the mixed operating mode,
which allows the simultaneous front and remote use.
To achieve external control, the R&S®HMP series uses the
scripting language SCPI (= Standard Commands for
Programmable Instruments). The provided USB/RS232
dual interface (optional Ethernet/USB or IEEE-488 GPIB)
enables you to control the ROHDE & SCHWARZ instrument externally via remote connection (remote control). As
a result, you can access nearly all functions that are
available during the manual operating mode via front
panel. To download a PDF document with a detailed list of
supported SCPI commands, please visit the ROHDE &
SCHWARZ homepage.
To enable communication, the selected interface and the respective settings in the measuring instrument must be identical to
the selections for the PC.
2 Tx Data (data from power supply to external device)
3 Rx Data (data from external device to power supply)
7 CTS Clear to Send
8 RTS Request to Send
5 ground (reference potential, connected with power supply
(safety class II) and power cable to the grounding conductor
9 +5V supply voltage for external devices (max. 400mA)
Fig. 6.1: Pin assignment of the RS-232 interface
The currently available USB driver have been fully tested and
released for Windows XP™, VISTA™, Windows 7™ and Windows
8™ (32 + 64 Bit).
The USB interface must be selected in the menu of the
power supply and requires no further action. The actual USB driver can be downloaded from the ROHDE &
SCHWARZ homepage for free. If a connection between PC
and the instrument has been established and no R&S®HMP
USB driver is installed, the operating system answers with
“Found New Hardware”. Only in this case the USB driver
must be installed. Further information about the USB
driver installation you can find in the HO720/HO730/HO732
installation guide internal of the driver file.
The RS-232 interface is built with a 9-pin D-SUB connector. This bidirectional interface allows the transfer of setup
parameters, data and screenshots from an external device
(e.g. PC) to the power supply or vice versa. It is possible to
establish a direct connection from the PC (serial port ) to
the interface via 9-pin shielded cable (1:1 wired). The maximum length must not exceed 3 m. The pin assignment for
the RS-232 interface (9-pin D-SUB connector) please refer
to fig. 6.1.
The following requirement for USB driver installation are necessary:
1 R&S®HMP with an activated USB interface.
2 A PC with operating system Windows XP™, VISTA™, Windows 7™, Windows 8™ or Windows 10™ (32 or 64Bit).
3 Administrator rights are necessary for the installation of the
driver. If an error message regarding spelling errors appears,
the rights to install the driver are not given. In this case,
please contact your IT department to obtain the necessary
The maximum voltage variation at the Tx, Rx, RTS and CTS
connections is ±12 Volt. The RS-232 standard parameters
for the interface are as follows:
❙❙ 8-N-1 (8 data bits, no parity bit, 1 stop bit)
❙❙ RTS/CTS hardware protocol: none.
In addition, you may use the free software HMExplorer.
This Windows application offers R&S®HMP instruments a
terminal function and the option to create screenshots and
arbitrary waveforms.
Use the MENU key and the menu item Interface to set
these parameters on the R&S®HMP. Afterwards, please
make sure that the RS-232 selection as the interface is
indicated by a check mark. You can select the interface
parameters under Settings.
6.3 Ethernet (Option HO730/HO732)
For the direct connection with a host (PC) or indirect
connection over a SWITCH, a doubly protected network
cable (e.g. CAT.5, CAT.5e, CAT.5+, CAT.6 or CAT.7) is
required, equipped with an Ethernet plug type the RJ-45 at
each end. Either an uncrossed or a crossed network cable
(cross over cable) can be used.
Remote Control
6.3.1 IP networks (IP – Internet protocol)
In order that two or several network elements (e.g. measuring instruments, host/PC‘s, …) can communicate over a
network with one another, some fundamental connections
have to be considered, so that data communication is error
free and unimpaired.
For each element in a network an IP address has to be
assigned, so that they can exchange data among themselves. IP addresses are represented (with the IP version
4) as four decimal numbers separated by points (e.g. Each decimal number is represented by
a binary number of 8 bits. IP addresses are divided into
public and private address ranges. Public IP addresses will
be able to route by the Internet and an Internet service
Provider (ISP) can to be made available. Public IP addresses can be reached directly over the Internet to directly
exchange internet data. Private IP addresses are not
routed by the Internet and are reserved for private networks. Network elements with private IP addresses cannot
be reached directly over the Internet so no data can be
directly exchanged over the Internet. To allow network
elements with a private IP address to exchange data over
the Internet, they require a router for IP address conversion
(English NAT; Network address translation), before connection to the Internet. The attached elements can then
data exchange over this router, which possesses a private
IP address (LAN IP address) and also a public IP address
(WAN IP address), via the Internet.
If network elements exchange data only over a local network (without connection with the Internet), appropriate
use private IP addresses. Select in addition e.g. a private IP
address for the instrument and a private IP address for the
host (PC), with which you would like to control the instrument. If you might connect your private network with the
Internet later via a router, the private IP addresses used in
your local network can be maintained. Since within each
IP address range the first IP address is used as network
IP address and the last IP address is used as Broadcast IP
address, in each case two IP addresses have to be taken
off from the “number of possible host addresses“ (see
table 1: Private IP address ranges).
Apart from the organization of IP addresses into public and
private address ranges, IP addresses are also divided into
classes (Class: A, B, C, D, E). Within the classes A, B, and
C are also include the private IP of address ranges described before. The categorisation from IP addresses is for
the assignment of public IP address ranges of importance
and essentially depends on the size of a local network
(maximum number of hosts in the network), which is to
be connected with the Internet (see table 2: Classes of
IP addresses). IP addresses can fix (statically) or variable
(dynamically) to be assigned. If IP addresses in a network
are assigned fix, an IP address must be preset manually
with each network element. If IP addresses in a network
are assigned to the attached network elements automatically (dynamically), a DHCP server (English DHCP becomes; Dynamic Host Configuration Protocol) is required for
the dispatching of IP addresses. With a DHCP server an IP
address range for the automatic dispatching of IP addresses can be preset. A DHCP server is usually already integrated in a router (DSL router, ISDN router, Modem router,
WLAN router, …) integrated. If a network element (e.g.
an instrument) is connected by a network cable directly
with a host (PC), the IP addresses cannot be assigned to
the instrument and the host (PC) automatically, since no
network with DHCP server is present here. They have to
be preset therefore at the instrument and at the host (PC)
IP addresses are divided by using subnet mask into a
network quota and into a host quota, so similarly e.g. a
telephone number is divided in pre selection (land and local area network number) and call number (user number).
Subnet mask have the same form as IP addresses. They
are represented with four decimal numbers separated
by points (e.g. As is the case for the IP
addresses here each decimal number represents a binary
number of 8 bits. The separation between network quota
and host quota is determined by the subnet mask within
an IP address (e.g. the IP address by the subnet mask is divided into a network quota and a host quota of The allocation
takes place via the transformation of the IP address and
the subnet mask in binary form and afterwards a bit by bit
adress range
subnetz mask
CIDR way of writing
number of possible host adresses –
224 − 2 = 16.777.214 –
220 − 2 = 1.048.574 –
216 − 2 = 65.534
28 − 2 = 254
Table 6.1: Private IP adress ranges
adress range
net quota
host quota
max. number of networks max. number of hosts
A -
8 Bit
24 Bit
B -
16 Bit
16 Bit
C -
24 Bit
8 Bit
D -
Reserved for multicast applications
E -
Reserved for special applications
Table 6.2: Classes of IP adresses
Remote Control
one logical AND operation between IP address and subnet
mask. The result is the network quota of the IP address.
The host quota of the IP address takes place via the bit by
bit logical NAND operation between IP address and subnet
mask. By the variable allocation of IP addresses in network
quota and host quota via subnet masks, one can specify IP
address ranges individually for large and small networks.
Thus one can operate large and small IP networks and
connect if necessary to the Internet via a router. In smaller
local networks the subnet mask is mostly
used. Network quota (the first 3 numbers) and host quota
(the last number) are simple here without much mathematical expenditure to determine and it can with these
subnet mask up to 254 network elements (e.g. measuring
instruments, hosts/PC‘s...) in a network be operated at the
same time.
Often also a standard gateway is present in a network. In
most local networks is this gateway with the router to the
Internet (DSL router, ISDN router etc.) is identical. Using
this (gateway -) router a connection can be manufactured
with another network. Thus also network elements, which
are not in the same (local) network, can be reached and/
or network elements from the local network are able to exchange data with network elements from other networks.
For a network-spreading data exchange the IP address
of the standard gateway must also be preset. In local
networks, mostly the first IP address within a network for
this (gateway -) router is used. Mostly routers in a local
network to be used as gateway have an IP address with a
„1“ in the last place of the IP address (e.g.
6.3.2 Ethernet settings
PC and instrument have to be connected to the same network.
Otherwise a remote connection is not possible.
In addition to the USB interface, the optional interface card
HO730 resp. HO732 includes an Ethernet interface. The
required parameters are selected in the power supply once
Ethernet has been selected as interface. You can
specify all parameters and assign a fixed IP address. You
can also assign a dynamic IP address with the activated
DHCP function. Please contact your IT management to
configure the settings properly.
If DHCP is used and the system cannot assign an IP address to
the R&S®HMP (for instance, if no Ethernet cable is connected or
the network does not support DHCP), it may take up to three minutes until a timeout allows the interface to be configured again.
If the device has an IP address, it can be accessed via web
browser at this IP since the HO730 resp. HO732 includes
an integrated web server. Enter the IP address in the location bar on your browser (http//xxx.xxx.xxx.xx). This opens
a window that includes the instrument name and type,
serial number and interfaces with technical information
and configured parameters. For further information, please
refer to the HO730 resp. HO732 manual on the ROHDE &
SCHWARZ homepgage.
In general, the HO730 works with a RAW-Socket communication
to control the instrument and to retrieve the measuring values.
Therefore, a TMC protocol or a similar protocol will not be used.
6.4 IEEE 488.2 / GPIB (Option HO740)
The optional interface card HO740 includes a IEEE488.2 interface. The required parameters are selected in the power
supply once IEEE 488 has been selected as interface. For
further information, consult the HO740 manual.
Advanced Applications
7 Advanced Applications
7.1 Compensating for Voltage Drops on the Supply
Lines (Sense Mode)
should be set to the identical value. If one of the outputs
exceeds the current limit, the total voltage will naturally
collapse. It is advisable to set both voltages to a similar
value to distribute the loads evenly (not absolutely necessary). If a (low resistance) load is connected, it is essential
to activate more than one channel. This could damage the
instrument (especially protective diodes). Therefore, it is
necessary to always have both channels or no channel at
all switched on.
7.2.2 Parallel Mode
If it is necessary to increase the total current, the power
supply outputs must be wired in parallel. The output
voltages for the individual outputs should be set to the
same voltage value as precisely as possible. For slight
voltage differences, it is common in this operating mode
to first charge a voltage output up to the current limit; the
other voltage output provides the remaining current.
For the parallel mode, you must ensure that the allowed protective low voltage can be exceeded.
Fig. 7.1: Compensating the voltage drops in diagram
The two SENSE lines allow you to compensate voltage
drops on the supply lines to the load so that the actual selected voltage is applied to the load. Use two separate measuring lines to connect the load to the two external black
safety sockets of the respective channel (see figure above).
7.2 Parallel and Serial Mode
It is assumed that only qualified and trained personnel service
the power supplies and the connected consumers.
To increase output voltage and currents, it is possible to
operate the channels in serial or parallel mode. These operating modes require that power supplies are suitable for
the parallel and/or serial mode. This is the case for HAMEG
power supplies. In general, the output voltages to be combined are independent. The outputs for one or multiple
power supplies can be interconnected for this purpose.
7.2.1 Serial Mode
If the maximum total instrument power is exceeded, the output
(OUTPUT) will automatically be switched off! A warning will be
shown on the display.
As can be seen, this type of interconnection adds the individual output voltages. The same current flows through all
outputs. The current limits for the outputs wired in series
32 V
2.5 A
32 V
2.5 A
64 V
2.5 A
Fig. 7.2: Example serial mode
The maximum total current is the sum of the individual
currents of all sources connected in parallel. For power
supplies that are connected in parallel, It is possible that
compensating currents flow within the power supplies.
The use of power supplies by other manufacturers, which
are potentially not overload proof, can cause destruction of
these units as currents may be distributed unevenly.
32 V
2.5 A
32 V
2.5 A
32 V
Fig. 7.3: Example parallel mode
Generally, a higher current will first be supplied from the
channel with the higher output voltage. Once this channel
reaches its power limit, the remaining current will be made
available by the channel that is connected in parallel. In this
scenario, it is unpredictable which channel will supply the
higher current because it is also possible for channels with
identical voltage values to display a low voltage difference.
By increasing the voltage slightly, the load distribution can be
manipulated. If the voltage for a channel is to be increased by
50mV, for instance (by a set of identical cables), the current will
initially be provided by this channel.
If you wish to distribute the load to multiple channels, it is
recommended to set the current limit of the channel that
is to supply the main current to a fraction of the current.
This approach handles the semiconductor with care and
improves the heat dissipation, as the power loss is distributed more evenly.
Advanced Applications
8 Specifications
Programmable power supplies 2 / 3 / 4 channels
HMP2020 HMP2030 HMP4030 HMP4040
All data valid at 23°C after 30 minute warm-up.
10 A:
<500 mA: <0,05 % + 0,5 mA, typ. ±0,5 mA;
≥500 mA: <0,05 % + 2 mA, typ. ±2 mA
<500 mA: <0,05 % + 0,5 mA, typ. ±0,2 mA;
≥500 mA: <0,05 % + 2 mA, typ. ±1 mA
Line co
Residual ripple::
3 Hz…100 kHz; 3 Hz…20 MHz
<150 µVrms typ.; 1,5 mVrms typ
<250 µVrms
<1 mArms
5 A:
Residual deviation after a load change (10 to 90 %):
<0.01 % + 2 mV
Advanced parallel and series operation: simultaneous switching on/off of
active channels via “output” button, common voltage- and current control
using tracking mode (individual channel linking), individual mapping of
channels which shall be affected by FuseLink overcurrent protection
(switch-off), all channels galvanically isolated from each other and the
protective earth
<0.01 % + 250 µA
4 x 0 - 32 V / 0 - 10 A
3 x 0 - 32 V / 0 - 10 A
3 x 0 - 32 V / 0 - 5 A
1 x 0 - 32 V / 0 - 10 A;
Residual deviation after a line voltage change (±10 %):
<0.01 % + 2 mV
<0.01 % + 250 µA
Recovery time after a load
step from 10 to 90 % for
return within a ±10 mV
<1 ms
Arbitrary function EasyArb
1 x 0 - 32 V / 0 - 5 A
Parameters of points:
Voltage, current, time
Output terminals:
4 mm safety sockets frontside, screw-type
terminal rear side (4 units per channel)
Number of points:
Dwell time:
10 ms to 60 s
Output power:
188 W max.
Repetition rate:
HMP4030 / HMP4040
384 W max.
Continuous or burst mode with
1 to 255 repetitions
HMP2020 / HMP2030
188 W max.
Manually via keyboard or via interface
Maximum ratings
Compensation of lead
resistances (Sense):
protection (OVP/OCP):
Adjustable for each channel
Electronic fuse:
Adjustable for each channel,
may be combined using FuseLink
Response time:
<10 ms
32 V channels
Reverse voltage:
33 V max.
Reverse polarized voltage:
0.4 V max.
Max. permitted current in
case of reverse voltage:
5 A max.
Voltage to earth:
150 V max.
Temperature coefficient/°C:
Output values:
0.01 % + 2 mV
4 x 0 - 32 V/0 - 10 A, (5 A bei 32 V, 160 W max.)
0.02 % + 3 mA
3 x 0 - 32 V/0 - 10 A, (5 A bei 32 V, 160 W max.)
3 x 0 - 32 V/0 - 5 A, (2,5 A bei 32 V, 80 W max.)
HMP4030 / HMP4040
240 x 128 pixel LCD (full graphical)
1 x 0 - 32 V/0 - 10 A, (5 A bei 32 V, 160 W max.)
1 x 0 - 32 V/0 - 5 A, (2,5 A bei 32 V, 80 W max.)
HMP2020 / HMP2030
240 x 64 pixel LCD (full graphical)
Non volatile memory for 3 arbitrary
functions and 10 device settings
1 mV
Dual interface USB/RS-232 (HO720)
Processing time:
<50 ms
10 A:
5 A:
HMP4030 / HMP4040
<1 A: 0.2 mA; ≥1 A: 1 mA
Protection class:
Safety class I (EN61010-1)
<1 A: 0,1 mA; ≥1 A: 1 mA
Power supply:
115/230 V±10 %; 50 to 60 Hz, CAT II
<1 A: 0,2 mA; ≥1 A: 1 mA
<1 A: 0,1 mA; ≥1 A: 1 mA
Mains fuses
HMP4030 / HMP4040:
115 V: 2 x 10 A slow blow 5 x 20 mm
230 V: 2 x 5 A slow blow 5 x 20 mm
<0.05 % + 5 mV (typ. ±2 mV)
Mains fuses
HMP2020 / HMP2030:
115 V: 2 x 6 A slow blow 5 x 20 mm
230 V: 2 x 3.15 A slow blow 5 x 20 mm
10 A:
5 A:
Setting accuracy:
Power consumption:
HMP4030 / HMP4040
<0.1 % + 5 mA (typ. ±1 mA at I <500 mA)
550 VA max.
<0.1 % + 5 mA (typ. ±0.5 mA bei I <500 mA)
350 VA max.
<0,1 % + 5 mA (typ. ±1 mA bei I <500 mA)
<0,1 % + 5 mA (typ. ±0,5 mA bei I <500 mA)
Operating temperature:
+5…+40 °C
Storage temperature:
-20…+70 °C
Rel. humidity:
5…80 % (non condensing)
10 A:
5 A:
Measurement accuracy:
<0.05 % + 2 mV
HMP4030 / HMP4040:
<500mA: <0.05 % + 0.5 mA, typ. ±0.5 mA
≥500 mA: <0.05 % + 2 mA, typ. ±2 mA
<500 mA: <0.05 % + 0.5 mA, typ. ±0.2 mA
≥500 mA: <0.05 % + 2 mA, typ. ±1 mA
Dimensions (W x H x D):
HMP4030 / HMP4040
285 x 125 x 365 mm
HMP2020 / HMP2030
285 x 75 x 365 mm
HMP4030 / HMP4040
approx. 10 kg
HMP2020 / HMP2030
8.5 kg
±0,5 mA;
±0,2 mA;
Accessories included:
Line cord, operating manual, CD, software
9.1 List of figures
Fig. 1.1: Voltage selector . . . . . . . . . . . . . . . . . . . . . . . . . 30
Fig. 1.4: Product labeling in accordance with EN 50419.31
Fig. 2.1: Front panel of R&S®HMP2030. . . . . . . . . . . . . . 32
Fig. 2.2: Rear panel of R&S®HMP2030 . . . . . . . . . . . . . . 32
Fig. 2.3: Front panel of R&S®HMP4040. . . . . . . . . . . . . . 33
Fig. 2.4: Rear panel of the HMP4040 . . . . . . . . . . . . . . . 33
Fig. 3.1: R&S®R&S®HMP4030 (3-channel version) . . . . . 34
Fig. 3.2: Example of an arbitrary function. . . . . . . . . . . . 34
Fig. 3.3: Fuse Linking R&S®HMP2030 / R&S®HMP4040. 34
Fig. 3.4: R&S®HMP4040 terminal strip on the
back panel of the instrument. . . . . . . . . . . . . . . 34
Fig. 4.1: Adjustable maximum values R&S®HMP2020. . 35
Fig. 4.2: Adjustable maximum values R&S®HMP2030. . 35
Fig. 4.3: Adjustable maximum values R&S®HMP4030. . 35
Fig. 4.4: Adjustable maximum values R&S®HMP4040. . 35
Fig. 4.5: Current limit. . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Fig. 4.6: (R&S®HMP2030) R&S®HMP2020/4030/4040
power hyperbola . . . . . . . . . . . . . . . . . . . . . . . 36
Fig. 4.7: R&S®HMP2030/ ¸HMP4040
Fuse appearance in the display. . . . . . . . . . . . . 36
Fig. 5.1: 1-V position for all three channels
(R&S®HMP2030). . . . . . . . . . . . . . . . . . . . . . . . . 37
Fig. 5.2: Example Fuse Linking (¸HMP4040). . . . . . 37
Fig. 5.3: Setting the Fuse Delay (R&S®HMP2030). . . . . . 37
Fig. 5.4: Over Voltage Protection (R&S®HMP2030). . . . . 37
Fig. 5.5: Arbitrary settings (R&S®HMP2030). . . . . . . . . . 38
Fig. 5.7: Output arbitrary example on an oscilloscope. . 38
Fig. 5.6: Arbitrary-Editor example (excerpt)
HMExplorer Software . . . . . . . . . . . . . . . . . . . . 38
Fig. 5.8: Key Fallback Time (R&S®HMP2030) . . . . . . . . . 39
Fig. 5.9: Beeper (R&S®HMP2030) . . . . . . . . . . . . . . . . . . 39
Fig. 6.1: Pin assignment of the RS-232 interface . . . . . . 40
Fig. 7.1: Compensating the voltage drops in diagram . . 43
Fig. 7.2: Example serial mode. . . . . . . . . . . . . . . . . . . . . 43
Fig. 7.3: Example parallel mode. . . . . . . . . . . . . . . . . . . . 43
Recommended accessories:
HO730 Dual interface ethernet/USB
HO740 Interface IEEE-488 (GPIB), galvanically isolated
HZ10S 5 x silicone test lead (measurement connection
in black)
HZ10R 5 x silicone test lead (measurement connection
in red)
HZ10B 5 x silicone test lead (measurement connection
in blue)
HZ13 Interface cable (USB) 1.8 m
HZ14 Interface cable (serial) 1:1
HZ42 2RU 19“ rackmount kit
HZ72 GPIB-cable 2 m
HZP91 19“ rackmount kit 4RU
Ambient temperature: 27
Arbitrary: 35
Arbitrary function: 31, 35, 42
Arbitrary waveform: 35, 42
Baud rate: 36
Beeper: 36
Brightness Fallback Time: 36
Channel option keys: 32
Clear Waveform: 35
Constant Current operating mode: 33
Constant voltage operating mode: 33
Cooling: 27
CURRENT: 29, 30, 32, 33, 34
Current limit: 33, 34, 39, 40
Display Contrast: 36
Display & Key Brightness: 36
Driver: 37
Dual Interface: 36
EasyArb function: 31
Edit Waveform: 35
Electronic fuse: 33, 34
Fuse Delay: 34
FUSE Linking: 34
GPIB interface: 36
Instrument information: 36
Intensity of illumination: 36
Interface: 29, 30, 36
Key Brightness: 36
Key Fallback Time: 32, 33, 36
Load distribution: 39
Mains voltage: 26, 28, 29, 30
Maintenance: 27, 28
Maximum values: 32
Measuring category: 28
Menu options: 34
Numeric keypad: 30
Operating temperature: 27
Operation: 26, 28, 32, 33
OUTPUT: 29, 30, 32, 33, 34, 35
Output power: 31
Output voltage: 29, 32
OVP (Over Voltage Protection): 35
Parallel operation: 39
Performance: 31, 33
Power hyperbola: 32
Power limit: 39
Recall Waveform: 35
Remote mode: 37
Repair: 27
Repetition rate: 35
Replacing a fuse: 28
Reset Device: 37
Safety instructions: 26
Save Waveform: 35
SCPI: 37
Series operation: 39
Sounds: 36
Start Waveform: 35
Stop Waveform: 35
Storage: 26, 27
Switch on: 32
Total current: 39
Tracking function: 34
Tracking mode: 34
Transfer Waveform: 35
Transport: 26
USB interface: 38
virtual COM Port: 38
VOLTAGE: 29, 30, 32, 33, 34
Voltage range: 31
Voltage regulation: 33
Voltage variation: 37
Warranty: 26, 27, 28
Windows HyperTerminal: 37
© 2015 Rohde & Schwarz GmbH & Co. KG
Mühldorfstr. 15, 81671 München, Germany
Phone: +49 89 41 29 - 0
Fax: +49 89 41 29 12 164
E-mail: info@rohde-schwarz.com
Internet: www.rohde-schwarz.com
Customer Support: www.customersupport.rohde-schwarz.com
Service: www.service.rohde-schwarz.com
Subject to change – Data without tolerance limits is not binding.
R&S® is a registered trademark of Rohde & Schwarz GmbH & Co. KG.
Trade names are trademarks of the owners.
5800.4492.02 │ Version 02 │R&S®HMP Series
The follwowing abbreviations are used throughout this manual: R&S®HMP Series is abbreviated as R&S HMP Series.
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