Precise constant current
Each channel delivers 0 to 5 mA with a programming resolution of 1 µA.
N9244 – Programmable Multi-Channel DC Power Supply with 44 Channels
Designed for parallel constant-current testing of Mini LEDs and optoelectronic components.
The modular architecture groups the outputs into two connectors with 22 channels each. Its compact half-width 19-inch, 2U enclosure supports benchtop operation as well as integration into multi-channel production and automated test systems.
Leakage-free OFF state
Disabled outputs provide no leakage current to the connected device under test.
Multi-channel display
The 4.3-inch colour display shows voltage and current information for up to 22 channels simultaneously.
LAN, RS232 and Modbus
Remote control and system integration are supported through LAN, RS232 and the standard Modbus protocol.
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ART. NO.
Description
Current [A]
Power [P]
Voltage [V]
N9244-40-M005
|
Description
N9244-40-M005 Programmable precision multi-channel DC power supply, 44 channels, 40 V, 5 mA, 2U, LAN/RS232
|
Current [A]
0,0005
|
Power [P]
0,2
|
Voltage [V]
40
|
44 Channel DC Load
Technical Data
Product category
DC Power Supply
Type of DC source
Standard DC Source
Benchtop Unit
Multi-channel
N9244 series overview
The N9244 is a programmable multi-channel DC power supply for simultaneous constant-current operation and electrical testing of LEDs, Mini LEDs and comparable optoelectronic components. The N9244-40-M005 provides 44 channels with a programmable current range from 0 to 5 mA. Each channel also measures the applied voltage and output current.
The 44 outputs are distributed across two connectors with 22 channels each. This channel architecture reduces wiring effort in fixtures containing a large number of devices under test. The half-width 19-inch enclosure occupies 2U and supports both benchtop operation and integration into automated test equipment. A 4.3-inch colour display provides local control and simultaneous monitoring of multiple channels.
LAN and RS232 are available for remote control. The standard Modbus protocol and PC software support integration into automated test sequences and multi-channel production systems.
Key benefits
High channel density
Forty-four separately connected constant-current channels allow many LEDs to be tested in parallel using one instrument.
Fine current programming
A programming resolution of 1 µA supports repeatable testing at low operating currents up to 5 mA.
No leakage current
No current leaks through a disabled output, preventing unintended biasing of sensitive devices under test.
Grouped output connections
Two output connectors with 22 channels each simplify the wiring of multi-channel fixtures and test adapters.
Direct result monitoring
The 4.3-inch colour display provides direct access to set values and channel-specific voltage and current readback.
Automated test integration
LAN, RS232, Modbus and PC software facilitate integration into production lines and automated test systems.
Multi-channel constant-current operation
Each output channel operates as a programmable constant-current source. The required current is set between 0 and 5 mA and regulated independently of the resulting device voltage, provided that operation remains within the permissible range. The instrument simultaneously reads back the output current and the voltage present at each channel.
For tests using identical operating points, a common current value can be applied across the channels. This allows large groups of LED chips or lighting components to be supplied using consistent test parameters. Voltage readback up to 40 V supports channel-specific evaluation of the electrical behaviour of each connected device.
Technical distinction:
The N9244 regulates output current. The voltage range up to 40 V is specified for voltage readback at the connected device and does not represent a programmable constant-voltage operating mode.
Models and technical specifications
The N9244 series includes the N9244-40-M005 for 44-channel constant-current testing.
| Model | Channels | Constant-current range | Programming resolution | Programming accuracy | Voltage readback |
|---|---|---|---|---|---|
| N9244-40-M005 | 44 | 0 to 5 mA | 1 µA | 0.1% + 20 µA | 0 to 40 V |
| Measurement function | Range | Resolution | Accuracy at 23 ± 5 °C |
|---|---|---|---|
| Current readback | 0 to 5 mA | 1 µA | 0.1% + 20 µA |
| Voltage readback | 0 to 40 V | 10 mV | 1% + 0.1 V |
Operation and programmable functions
Constant-current mode
The outputs regulate the programmed current for repeatable electrical testing of LEDs and semiconductor components.
Common current setting
A uniform current value can be assigned across the channels to accelerate testing of large component groups.
Multi-channel monitoring
Voltage and current information from up to 22 channels can be viewed simultaneously on the front display.
Screenshots and data storage
The front USB port supports screen capture and storage of test data on a USB memory device.
Typical applications
The high channel density and low constant-current range are designed for parallel testing of small optoelectronic components.
Mini LED devices
Multiple Mini LEDs are operated at defined currents while voltage and current are read back individually for each channel.
LED lamp beads
Individual LED components can be tested in multi-channel fixtures under consistent electrical operating conditions.
LED light bars
Multiple test points on a light bar can be supplied in parallel and compared using their electrical measurement results.
Production and end-of-line testing
Remote control and grouped channel connections support automated functional testing of optoelectronic components in production equipment.
Interfaces, software and automation
The communication and operating functions support manual laboratory use as well as integration into automated test systems.
| Interface or function | Availability | Purpose |
|---|---|---|
| LAN | Standard | Network-based remote control and integration into automated test equipment. |
| RS232 | Standard | Serial communication with control computers and existing test-system infrastructure. |
| Modbus | Standard | Standardised communication protocol for system integration. |
| Front USB port | Standard | Storage of screenshots and test data on a USB memory device. |
| PC software | Available | Control of larger test configurations and support for application-specific test processes. |
| Secondary development | Supported | Integration of instrument functions into application-specific test software and system controllers. |
Installation and infrastructure
| Characteristic | Specification |
|---|---|
| AC input | 220 V AC ±10% |
| Input frequency | 47 to 63 Hz |
| Form factor | Half-width 19-inch enclosure, 2U |
| Dimensions | 88.0 × 214.0 × 360.5 mm |
| Net weight | Approx. 2.4 kg |
| Operating temperature | 0 to 40 °C |
| Relative humidity | 5 to 90% RH, non-condensing |
| Atmospheric pressure | 80 to 110 kPa |
| Cooling | Air cooling with rear air outlet |
The rear air outlet must remain unobstructed during benchtop use and system integration to maintain adequate airflow.
Protection and operational safety
Integrated protective functions support safe operation of the instrument and connected devices under test. The leakage-free OFF state prevents unintended current from reaching disabled channels. The modular instrument architecture also facilitates servicing in multi-channel test systems.
The permissible current and voltage ranges of each device under test must be checked before connection. Maximum output current is 5 mA per channel, and voltage readback is specified up to 40 V.
Frequently asked questions about the N9244
How many devices can be connected simultaneously?
The N9244-40-M005 provides 44 channels. The actual number of devices depends on the wiring and design of the test adapter.
Can the N9244 provide a constant-voltage output?
No. The outputs operate as constant-current sources. Voltage up to 40 V is measured at each channel.
What current can be programmed per channel?
The programmable range is 0 to 5 mA per channel with a resolution of 1 µA.
Does current continue to flow when a channel is switched off?
No. No leakage current is specified for the OFF state.
Which interfaces are available for automation?
LAN and RS232 are provided as standard. The instrument also supports the standard Modbus protocol.
Is the instrument suitable for rack integration?
The enclosure has a half-width 19-inch format and a height of 2U. Mechanical integration must be adapted to the intended system configuration.
Technical consultation and project enquiry
ET System can assist with selecting a suitable connection concept, designing multi-channel test adapters and integrating the N9244 into automated production or laboratory test systems.
Please provide the number of devices under test, required current range, expected forward voltages and the intended level of automation.
