Eight operating modes
CC, CV, CR and CP are complemented by the combined CVCC, CRCC, CPCC and CVCR modes.
N61200 – Multi-channel DC Electronic Load up to 300 W per Channel
For compact test stations handling multiple independent devices under test.
Depending on the model, the half-width 19-inch enclosure accommodates two or four load channels within 2 U. Dual ranges for voltage, current, resistance and power combine fine resolution with coverage of the full rated range for accurately testing differently sized devices.
Dynamic load profiles
CCD, CVD, CRD and CPD operate continuously, in pulse mode or by toggle trigger, with CC dynamics up to 30 kHz.
LAN and RS485
Standard communication supports Modbus RTU, SCPI and TCP/IP for automated test and production systems.
N61204 channel pairing
Two channels can be combined into each of two independent units providing 60 A and 300 W.
Personal project consultation
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Select the appropriate technical configuration or access product documentation directly.
ART. NO.
Description
Current [A]
Power [P]
Voltage [V]
N61204-150-30
|
Description
N61204-150-30 Multi-channel programmable DC electronic load, 4 channels, 150 W per channel, 150 V, 30 A, 2U / half 19"
|
Current [A]
30
|
Power [P]
150
|
Voltage [V]
150
|
Desktop DC Load
Technical Data
Height
2
max. Current (A)
max. power (W)
max. voltage (V)
Number of channels
Multichannel
Product category
DC Electronic Load
Type of DC Load
Benchtop Unit
Multi-channel
N61202-150-60
|
Description
N61202-150-60 Multi-channel programmable DC electronic load, 2 channels, 300 W per channel, 150 V, 60 A, 2U / half 19"
|
Current [A]
60
|
Power [P]
300
|
Voltage [V]
150
|
Desktop DC Load
Technical Data
Height
2
max. Current (A)
max. power (W)
max. voltage (V)
Number of channels
Multichannel
Product category
DC Electronic Load
Type of DC Load
Benchtop Unit
Multi-channel
N61200 overview
The N61200 series comprises two compact multi-channel electronic loads for testing power supplies, converters, chargers, energy-storage devices and electronic assemblies. The N61204-150-30 provides four independently controlled channels rated at 150 V, 30 A and 150 W each. The N61202-150-60 provides two channels rated at 150 V, 60 A and 300 W each. Both models use a 2 U enclosure with half 19-inch width. Voltage, current, resistance and power each have two setting and measurement ranges, providing fine resolution without sacrificing the full channel rating. In addition to static and dynamic load modes, the instruments provide automated sequences, protection testing, discharge tests, LED simulation and measurements for load regulation, switching time and ripple.
Key benefits
Compact channel density
Two or four load channels in a 2 U half-width enclosure reduce space requirements in laboratory, ATE and production systems.
Low operating voltage
Load operation starts at 0.5 V at 3 A or 6 A, supporting tests on low-voltage converters and energy-storage devices.
Dual measurement ranges
Separate voltage, current, resistance and power ranges combine fine resolution with access to the full channel capability.
Remote sensing
Separate S+ and S− leads measure voltage directly at the DUT and reduce errors caused by cable and contact voltage drops.
Fast CC transients
Dynamic constant-current profiles up to 30 kHz support transient-response testing of power supplies and DC/DC converters.
Integrated test routines
OCP, OPP and OVP tests plus timing, load-regulation, discharge and ripple measurements reduce external equipment and programming effort.
Operating principle of the multi-channel DC electronic load
Each channel draws a defined current from the connected DUT while measuring input voltage, current and power. The resulting heat is removed by the integrated air-cooling system. All channels can operate independently with different setpoints and operating modes.
Current and voltage control
CC maintains a constant input current. CV adjusts the load current to hold the input voltage at the programmed value.
Resistance and power operation
CR emulates a defined electrical resistance. CP maintains constant absorbed power as the input voltage changes.
Combined characteristics
CVCC, CRCC and CPCC add a current limit to the primary regulation mode and provide controlled transitions between characteristic regions.
Voltage-resistance combination
CVCR combines voltage and resistance limits to create defined turn-on and loading characteristics without separate Von control.
Models, power range and operating characteristics
Both models operate at up to 150 V per channel. Selection is primarily based on the required channel count, maximum current and power for each DUT.
| Model | Channels | Voltage per channel | Current per channel | Power per channel | Minimum operating voltage |
|---|---|---|---|---|---|
| N61204-150-30 | 4 | 150 V | 30 A | 150 W | 0.5 V at 3 A / 1.2 V at 30 A |
| N61202-150-60 | 2 | 150 V | 60 A | 300 W | 0.5 V at 6 A / 1.2 V at 60 A |
| Function | N61204-150-30 | N61202-150-60 |
|---|---|---|
| CV ranges | 0 to 15 V / 0 to 150 V | 0 to 15 V / 0 to 150 V |
| CC ranges | 0 to 3 A / 0 to 30 A | 0 to 6 A / 0 to 60 A |
| CP ranges | 0 to 15 W / 0 to 150 W | 0 to 30 W / 0 to 300 W |
| CR ranges | 1 Ω to 15 kΩ / 0.1 Ω to 1.5 kΩ | 1 Ω to 7.5 kΩ / 0.1 Ω to 0.75 kΩ |
CV programming and readback accuracy are both 0.025% + 0.025% of full scale at 23 ± 5°C. Depending on the selected range, CC programming and readback accuracy are 0.05% + 0.05% or 0.03% + 0.05% of full scale. CP programming and readback accuracy are 0.1% + 0.1% of full scale.
Dynamic response and control behaviour
Dynamic testing is available for current, voltage, resistance and power. Continuous, Pulse and Toggle modes create periodic transitions, single triggered pulses or trigger-controlled switching between two load values. Current rise and fall slew rates are programmable, while the CV loop response can be adapted to the connected DUT.
| Dynamic parameter | N61204-150-30 | N61202-150-60 |
|---|---|---|
| Maximum CC dynamic frequency | Up to 30 kHz | Up to 30 kHz |
| Current slew rate, lower range | 0.001 to 100 A/ms | 0.001 to 200 A/ms |
| Current slew rate, higher range | 0.001 to 2,000 A/ms | 0.001 to 4,000 A/ms |
| Load-step timing range | 0.016 ms to 60,000 s | 0.016 ms to 60,000 s |
| Timing resolution | 1 µs / 1 ms | 1 µs / 1 ms |
Operating modes and programmable functions
| Operating mode | Function | Typical test task |
|---|---|---|
| CC | Constant input current | Load and regulation tests on power supplies and converters |
| CV | Constant voltage at the load input | Testing current-limited sources and charging functions |
| CR | Emulation of a defined resistance | Resistive load characteristics and turn-on behaviour |
| CP | Constant absorbed power | Electronic assemblies with power-dependent consumption |
| CVCC | CV regulation with current limiting | Transitions between voltage and current regulation |
| CRCC | CR regulation with current limiting | Controlled turn-on without unwanted overcurrent activation |
| CPCC | CP regulation with current limiting | Power profiles with a defined maximum current |
| CVCR | Combined voltage and resistance characteristic | Defined activation depending on the input voltage |
Sequence and automatic tests
Up to ten test files with a maximum of 50 steps each control operating modes, setpoints, dwell times and limit checks.
Discharge testing
Batteries and supercapacitors are discharged at a defined current, with termination based on voltage, time or discharged capacity.
LED simulation
An adjustable forward voltage and differential resistance component emulate LED behaviour at the selected operating point.
Protection-threshold tests
OCP, OPP and OVP routines determine protection thresholds, while the OVP test additionally measures the DUT response time.
Timing and load-regulation tests
Turn-on, hold and rise times as well as output-voltage changes between different load points can be measured directly.
Save and recall
Twenty parameter sets for CC, CV, CR, CP and dynamic testing can be stored in the instrument and recalled quickly.
Typical applications
Independent channels and integrated test routines support both parallel individual tests and automated functional verification.
Power supplies and DC/DC converters
CC, CV, CR and CP operation apply static or dynamic loads and support regulation, protection and load-transient tests.
Fast-charging adapters and mobile devices
The optional fast-charging module tests supported USB-PD, QC, PE, FCP, SCP, AFC and VOOC protocols, including CC1 and CC2.
LED drivers
LED mode emulates forward voltage and differential resistance for load and ripple testing of LED power supplies.
Batteries and supercapacitors
Discharge cycles terminate automatically when a voltage threshold, programmed duration or defined discharged capacity is reached.
Test solutions for automotive and e-mobility
Wiring harnesses, connectors, fuses, relays and electrical distribution units can be tested with defined load and protection profiles.
Production and end-of-line test systems
Multiple channels, automatic sequences, limit checks and remote control support reproducible series testing and ATE integration.
Interfaces, software and automation
| Interface or function | Availability | Technical use |
|---|---|---|
| LAN | Standard | RJ45 network connection for remote control, instrument configuration and PC software |
| RS485 | Standard | Serial communication with configurable baud rate and parity |
| Communication protocols | Standard | Modbus RTU, SCPI and TCP/IP |
| External trigger | Standard | 5 V TTL input for Toggle and Hold control and trigger-dependent load profiles |
| Remote Sense | Standard | Separate S+ and S− terminals for voltage measurement directly at the DUT |
| PC software | Standard | Device discovery, IP configuration, remote control, parameter setting and data logging via LAN |
| Fast-charging test module | Optional | USB PD 2.0/3.0/3.1, QC 2.0/3.0/4.0+, PE+/PE+2.0, FCP, SCP, AFC and VOOC |
Communication response time is no more than 5 ms. In addition to instrument control, the PC software supports data logging and subsequent evaluation of stored measurement data.
Channel parallel operation and scaling
On the N61204-150-30, two adjacent channels can be combined into one load unit. The input-voltage rating remains 150 V, while the current and power capabilities are added.
| Configuration | Available units | Rating per unit | Characteristic |
|---|---|---|---|
| N61204, independent channels | 4 | 150 V / 30 A / 150 W | Four independently programmable load channels |
| N61204, paired channels | 2 | 150 V / 60 A / 300 W | CH1 + CH2 and CH3 + CH4 form two independent pairs |
| N61202 | 2 | 150 V / 60 A / 300 W | Two higher-current individual channels |
In the N61204 parallel mode, the sensing and fast-charging connections of Channel 1 are used for the first pair and the corresponding connections of Channel 3 for the second pair. The associated connections of the second channel in each pair are disabled in this operating state.
Installation and infrastructure
| Requirement | Technical specification |
|---|---|
| AC supply | 110 V or 220 V AC, single phase, selected at the rear panel |
| Line frequency | 47 to 63 Hz |
| AC input current | Maximum 1 A at 110 V or 220 V AC |
| Power connection | Three-pole connection with protective earth; a reliable PE connection is required |
| Cooling | Integrated air cooling; air inlets and outlets must remain unobstructed |
| Operating temperature | 0 to 40°C; power derating must be considered at elevated ambient temperatures |
| Storage temperature | -20 to 60°C |
| Relative humidity | 5 to 90% RH, non-condensing |
| Altitude | Below 2,000 m |
| Atmospheric pressure | 80 to 110 kPa |
| Dimensions | 88 × 214 × 450.5 mm, 2 U and half 19-inch width |
| Net weight | Approx. 6.7 kg |
Electrical connections must only be made while the instrument is switched off. Polarity, cable cross-section and current rating must be checked before connection. On instruments equipped with the optional fast-charging module, the QC port and the regular positive/negative load input must not be used simultaneously.
Protection and safety functions
Programmable thresholds
OVP, OCP and OPP monitor voltage, current and power. The load input is switched off when a programmed threshold is reached.
Overtemperature protection
Internal temperature monitoring terminates load operation when the permissible instrument temperature is exceeded.
Reverse-voltage detection
A detected reverse input voltage is indicated as a fault. Correct polarity must be verified before operation.
Automatic activation
Von and Voff define voltage-dependent on and off thresholds. A maximum load duration can also be programmed.
Input voltages above 1.1 times the rated voltage can permanently damage the instrument. The DUT must therefore remain within the voltage, current and power ratings of the selected channel.
N61200 series FAQ
Which model is suitable for four devices under test?
The N61204-150-30 provides four independent channels rated at 150 V, 30 A and 150 W each.
Which model provides 60 A per channel?
The N61202-150-60 provides two channels rated at 150 V, 60 A and 300 W each.
Can the channels be connected in parallel?
On the N61204, CH1 and CH2 as well as CH3 and CH4 can be paired into two independent 60 A, 300 W units.
Which static load modes are available?
The series supports CC, CV, CR, CP and the combined CVCC, CRCC, CPCC and CVCR operating modes.
How fast can dynamic current profiles operate?
Dynamic CC operation reaches up to 30 kHz. Depending on the model and range, the current slew rate reaches up to 4,000 A/ms.
Can fast-charging devices be tested?
Yes. The optional module supports USB PD 2.0, 3.0 and 3.1 as well as QC, PE, FCP, SCP, AFC and VOOC protocols.
Which remote-control interfaces are integrated?
LAN and RS485 are standard. Modbus RTU, SCPI and TCP/IP are available for automated control.
Can batteries and supercapacitors be discharged?
Yes. A discharge test can terminate automatically based on voltage threshold, test duration or discharged capacity.
Technical consultation and project enquiry
ET System supports you in selecting the appropriate channel architecture, defining dynamic load profiles and integrating the N61200 series into laboratory, ATE or end-of-line systems.
- Model selection based on voltage, current, power and channel count
- Evaluation of minimum operating voltage, dynamics and measurement ranges
- Integration via LAN, RS485, trigger and PC software
- Planning fast-charging, LED, discharge and protection-function tests
Contact ET System for technical consultation and project enquiries
