Application Note
SWITCHING OUTPUTS OF
MULTIPLE DC POWER SUPPLIES
R&S®NGL200 / R&S®NGM200
Products:
► R&S
®
NGL201
► R&S
®
NGL202
► R&S
®
NGM201
► R&S
®
NGM202
► R&S
®
NGL-K103
► R&S
®
NGM-K103
Thomas Lechner | 1GP126 | Version 2e | 06.2020
https://www.rohde-schwarz.com/appnote/1GP126
Rohde & Schwarz | Application Note Switching outputs of Multiple DC Power Supplies R&S®NGL200 /
R&S®NGM200 2
Contents
1 Overview ........................................................................................................ 3
2 Background ................................................................................................... 4
2.1 Prerequisites .......................................................................................................4
2.2 Principle of the synchronization ...........................................................................4
2.2.1 Switching on ........................................................................................................4
2.2.2 Switching off ........................................................................................................4
3 Preparations .................................................................................................. 4
3.1 Connections between the instruments ................................................................4
3.2 Settings ...............................................................................................................5
3.2.1 Device ................................ ................................ ................................ .................5
3.2.2 Channel 1/2 .........................................................................................................7
4 Operation ....................................................................................................... 8
5 Literature ....................................................................................................... 8
6 Ordering Information .................................................................................... 8
Rohde & Schwarz | Application Note Switching outputs of Multiple DC Power Supplies R&S®NGL200 /
R&S®NGM200 3
1 Overview
All channels of DC power supplies R&S®NGL200 and R&S®NGM200 are isolated against the grounding
equipment conductor and against the digital ground of the instrument. Therefore, channels can be connected
in parallel for increasing the current capability, or in series for achieving higher voltages or dual-voltage
supplies. In the case of parallel and serial connections it is usually desired to switch all channels
simultaneously on and off for protecting the supplied circuitry and for avoiding overcurrent on other power
supply channels.
This application note describes how to connect and configure DC power supplies R&S®NGL200 and
R&S®NGM200 for synchronized on and off switching of all channels across multiple power supplies.
Rohde & Schwarz | Application Note Switching outputs of Multiple DC Power Supplies R&S®NGL200 /
R&S®NGM200 4
2 Background
2.1 Prerequisites
The use of the digital I/O connector requires option "Digital trigger IO" (R&S® NGL-K103 or R&S® NGMK103, respectively).
The installed software version must be 2.016 or later.
2.2 Principle of the synchronization
All connectors are wired and configured the same way. The connections are made in a bus structure with
three wires, one for activating the outputs, another one for switching the outputs off, plus a ground
connection.
All outputs are switched simultaneously by manual or remote control of the "Output" button on a one-channel
power supply or a "Chx" button on a two-channel power supply. On two-channel power supplies the "Output"
must be permanently on.
The connection scheme and the configuration of master and slaves is described in the following sections.
2.2.1 Switching on
If any output is activated, either output "OUT1" or output "OUT2" of the digital I/O sends a negative pulse on
the "Output On" bus line. This pulse is received by inputs "Trigger_Ch1" and "Trigger_Ch2" of all instruments,
which causes all channels to be activated.
2.2.2 Switching off
If any channel is deactivated, the associated "Output Fault" output sends a negative pulse to the "Output Off"
bus line. The deactivation may be caused by switching the output off manually or remotely, or by any
protection being blown. This pulse is received by the "Inhibit Ch1" and "Inhibit Ch2" inputs which deactivate
the associated outputs.
3 Preparations
3.1 Connections between the instruments
The digital I/O interface of DC power supplies R&S® NGL200 and NGM200 is accessible via a 15 pin D-Sub
connector on the backplane.
All outputs of the digital I/O are implemented as switches to ground with "active low" logic. A parallel
connection including two or more outputs results in a "wired OR". The bus line goes low (active) when any of
the outputs goes low (active).
All inputs have pull-up resistors such that an input which is not connected is permanently inactive.
Rohde & Schwarz | Application Note Switching outputs of Multiple DC Power Supplies R&S®NGL200 /
R&S®NGM200 5
Figure 3-1 Connection schematic of the digital IO connectors
3.2 Settings
Settings are accessed with the menu button "≡" on the front panel of the power supply. The "Device" tab
provides access to global settings of the power supply. For each available channel there is a "Channel x" tab
with the settings which are individual to each channel.
3.2.1 Device
Figure 3-2 Device menu
3.2.1.1 Digital Output
Rohde & Schwarz | Application Note Switching outputs of Multiple DC Power Supplies R&S®NGL200 /
R&S®NGM200 6
Figure 3-3 Sub-menu for digital outputs
3.2.1.1.1 Output Fault
─ Enabled: ON
─ Source: Output Off
─ Channel: Any (NGL202 / NGM202 only)
─ Signal Type: Pulse
Figure 3-4 Settings for output fault
3.2.1.1.2 Output1
─ Enabled: On
─ Source: Output On Ch1
─ Signal Type: Pulse
Figure 3-5 Settings for digital output 1
3.2.1.1.3 Output2:
─ Enabled: ON (NGx202) / OFF (NGx201)
─ Source: Output On Ch2 / -
─ Signal Type: Pulse / -
Rohde & Schwarz | Application Note Switching outputs of Multiple DC Power Supplies R&S®NGL200 /
R&S®NGM200 7
Figure 3-6 Settings for digital output 2
3.2.1.2 Trigger
─ Enabled: ON
─ Source: Digital I/O
─ Digital I/O Pin: Ext. Trigger
─ Channel: Any (NGL202 / NGM202 only)
Figure 3-7 Trigger settings
3.2.2 Channel 1/2
Figure 3-8 Menu for channel 1
3.2.2.1 Output Channel 1/2
─ Triggered: ON
Rohde & Schwarz | Application Note Switching outputs of Multiple DC Power Supplies R&S®NGL200 /
R&S®NGM200 8
─ Trigger: Output On
Figure 3-9 Output settings for channel 1
4 Operation
Keep the "Output" button on with NGL202 und NGM202.
Switching on any of the "Ch1" and "Ch2" buttons on a NGL202 or NGM202 or the "Output" button on a
NGL201 or NGM201, or activating any channel by remote command "OUTP:SEL 1" causes all channels of
the connected instruments to be switched on.
Switching off any of the "Ch1" and "Ch2" buttons on a NGL202 or NGM202 or the "Output" button on a
NGL201 or NGM201, or deactivating any channel by remote command "OUTP:SEL 0" causes all channels of
the connected instruments to be switched off. All channels will also be switched off if any of the channels is
deactivated by over current protection, over voltage protection or over power protection.
5 Literature
[1]
Rohde & Schwarz, "R&S®NGL200 Power Supply Series User Manual," 13 April 2020. [Online].
Available: https://www.rohde-schwarz.com/manual/ngl200/.
[2]
Rohde & Schwarz, "R&S®NGM200 Power Supply Series User Manual," 30 March 2020. [Online].
Available: https://www.rohde-schwarz.com/manual/ngm200/.
6 Ordering Information
Designation
Type
Order No.
Single-channel power supply
R&S®NGL201
3638.3376.02
Rohde & Schwarz | Application Note Switching outputs of Multiple DC Power Supplies R&S®NGL200 /
R&S®NGM200 9
Designation
Type
Order No.
Two-channel power supply
R&S®NGL202
3638.3376.03
Digital trigger I/O
R&S®NGL-K103
3652.6385.02
Single-channel power supply
R&S®NGM201
3638.4472.02
Two-channel power supply
R&S®NGM202
3638.4472.03
Digital trigger I/O
R&S®NGM-K103
3643.9904.02
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1GP126 | Version 2e | 06.2020
Application Note | Switching outputs of Multiple DC Power Supplies
R&S®NGL200 / R&S®NGM200
Data without tolerance limits is not binding | Subject to change
© 2020 Rohde & Schwarz GmbH & Co. KG | 81671 Munich, Germany
www.rohde-schwarz.com
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