ARRAY USB PC Programmable 3721A DC Electronic Load 400W

Numéro de l'article:3721A
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Introduction:
3720A and 3721A Electronic Loads provide an adaptable, and functional asset wherever power sources need to be tested.These units are designed to provide high reliability, great performance, and ease of operation with multiple functionality.


Features:

4 basic functions: CC, CV, CR, and CP ; and 8 basic test modes: CCL, CCH, CV, CRL, CRM, CRH, CPV, CPC
High-speedsequence, high-speed transient, short-circuit, battery discharge and other auxiliary functions
Minimum operating voltage is less than 0.6V at the load's full rated current
Optional zero-voltage test accessories are available
Programmable current slew rate
Perfect protection assures high reliability in the most complicated of test environments
Multiple groups of parameters and lists can be saved and recalled
Ruggedized structure, exquisite user-friendly design and convenient operation
Supports SCPI (Standard Commands for Programmable Instrumentation) and Labview, and provides necessary PC software

 

High Reliability

  • Protective circuitry provides over-current, over-voltage, over-power, over-temperature and reverse polarity protection to ensure the protection of the electronic load;
  • A high-speed, power limiting circuit can limit input power rapidly when it is overloaded, thus there is no need to interrupt testing. Equipment adaptability to complicated operational environments is thereby greatly enhanced.

 

Great Performance

  • Circuit improvement greatly enhances the dynamic response of CR mode and widens the application scope of that mode;

  • Minimum operating voltage is less than 0.6V at the load's full rated current. With optional low-voltage testing devices, the maximum current can be achieved even though the input voltage is 0V. This is especially suitable for fuel cell, solar cell and other new energy test applications;
  • By adopting an optimum design of calculation method and high-speed hardware circuitry, the D/A conversion rate can reach 100kHz. The overall smoothness of slope control has been raised, meanwhile, the timing precision and resolution of dynamic test and sequential test have also been improved;
  • The 24 bit A/D and 17 bit D/A converters incorporated, provide this equipment with greatly enhanced setting and measurement resolution.

Multifunction

  • Equipped with four basic test functions: CC, CV,CR, CP;
  • High-speed transient operation with separate high/low lever time and rising/falling time control;

  • Powerful sequential test function; with a minimum step time of 10us; and a maximum step time of 10000s. Cyclic numbers can be adjusted freely and a sequence can be chained to another sequence to achieve even more complex test procedures;
  • Providingshort-circuit test, battery discharge test and other auxiliary functions;
  • Remote input terminal and external trigger input terminals are provided. The remote measurement can monitor the input signal automatically, and it is not necessary to change wiring or modify settings during operation;
  • 10 groups of setup parameters can be saved, and providing automatic uploading of preset parameters;
  • By supporting SCPI, it is easy to build an ATE (automatic test equipment) system that works with other programmable instruments via optional RS232, USB and GPIB interfaces.

 

Easy Operation

  • Design optimized for portability and rugged reliability;
  • Logical keypad design and convenient test operation;
  • Easy-to-set test parameters coupled with a powerful sequence editing function;
  • All electronic calibration - therefore no need to dismantle the equipment-chassis;
  • Firmware can be updated online.

 

Specifications

(The warm-up time is 30 minutes. Specifications indicate warranted performance in the 25°C ± 5°C region of the total temperature range).


 

Model

3720A

3721A

Input Ratings
Current

Voltage

Power*1

0~30A

0~80V

250W at 40oC

0~40A

0~80V

400W at 40oC


Input Characteristics
Input Characteristics




Minimum Operation Voltage

@Full Scale Current

0.6V

0.6V

Constant Current Mode
LowRange

Resolution

Accuracy

0~3A

0.1mA

0.1℅+5mA

0~4A

0.1mA

0.1℅+5mA

HighRange

Resolution

Accuracy

0~40A

1mA

0.1℅+10mA

0~40A

1mA

0.1℅+10mA

Constant Voltage Mode
Range

Resolution

Accuracy

0~80V

1mV

0.1℅+10mV

0~80V

1mV

0.1℅+10mV

Constant Resistance Mode
LowRange

Resolution

Accuracy @I>4A

0.02~2Ω

0.1mΩ

0.5℅+12mΩ

0.02~2Ω

0.1mΩ

0.5℅+12mΩ

MiddleRange

Resolution

Accuracy @V>8V

2~200Ω

8.6uS*2

0.3℅+1.25mS

2~200Ω

8.6uS

0.3℅+1.25mS

HighRange

Resolution

Accuracy @V>8V

20~2000Ω

0.96uS

0.3℅+0.625mS

20~2000Ω

0.96uS

0.3℅+0.625mS

Constant Power Mode
Range

Resolution @P<100W

@P≥100W

Accuracy

0~250W

1mW

10mW

0.2℅+600mW

0~400W

1mW

10mW

0.2℅+600mW

Current Measurement
LowRange

Resolution

Accuracy

0~4A

0.1mA

0.05℅+4mA

0~4A

0.1mA

0.05℅+4mA

HighRange

Resolution

Accuracy

0~40A

1mA

0.05℅+8mA

0~40A

1mA

0.05℅+8mA

Voltage Measurement
Range

Resolution

Accuracy

0~80V

1mV

0.1℅+8mV

0~80V

1mV

0.1℅+8mV

Power Measurement
Range

Resolution @P<100W

@P≥100W

Accuracy

0~250W

1mW

10mW

0.1℅+600mW

0~400W

1mW

10mW

0.1℅+600mW

Current Slew Rates
RangeCCH

CCL*3

1mA/us~4A/us

100uA/us~400mA/us

1mA/us~4A/us

100uA/us~400mA/us

Resolution

1mA/us

1mA/us

Accuracy*4

3% + 10us

3% + 10us

Transient Operation

Transient Mode

Continuous, Pulse, Toggled

Continuous, Pulse, Toggled

FrequencyRange *5

0.38Hz~50kHz

0.38Hz~50kHz

High/Low Time

Resolution

Accuracy

0~655.35ms

10us

0.2℅+10us

0~655.35ms

10us

0.2℅+10us

Rising/Falling Time

Resolution

Accuracy

10us~655.35ms

10us

0.2℅+10us

10us~655.35ms

10us

0.2℅+10us

List Characteristics
Step Time

Resolution

Accuracy

10us~100000s

10us

0.2℅+10us

10us~100000s

10us

0.2℅+10us

Number of Steps

1~50

1~50

Cycle

1~65535

1~65535

StoreCapacity

7 lists

7 lists

Expanded Functions

Chain

Chain

Battery Discharge
Discharge Time

Resolution

Accuracy

1s~100h

1s

0.2℅+1s

1s~100h

1s

0.2℅+1s

BatteryCapacity

Resolution

Accuracy

1mAh~4000Ah

1mAh

0.3℅+0.01Ah

1mAh~4000Ah

1mAh

0.3℅+0.01Ah

Short Circuit
CCL Mode

CCH Mode

CV Mode

CRL Mode

CRM Mode

CRH Mode

CPV Mode

CPC Mode

4.4A

44A

0V

0.018Ω

1.8Ω

18Ω

270W

0W

4.4A

44A

0V

0.018Ω

1.8Ω

18Ω

420W

0W

Maximum Slew Rate

 

Current

Voltage

4A/us

0.6V/us

4A/us

0.6V/us

Programmable Open Circuit

≥20kΩ

≥20kΩ

Trigger Input
Trigger Level

Trigger Pulse Width

TTL falling edge

≥10us

TTL falling edge

≥10us

Maximum Input Levels
Current

Voltage

44A

84V

44A

84V

Protection Features

OV, OC,OP,OT, RV

OV, OC,OP,OT, RV

Reverse Current Capacity
Input OFF

InputON

30A

50A

30A

50A

Ripple and Noise
Current(rms/p-p)

Voltage(rms)

3mA/30mA

5mV

3mA/30mA

5mV

Environmental Conditions
Temperature

Relative Humidity

0~50oC

≤85℅

0~50oC

≤85℅

Remote Interface*6

RS232, GPIB, USB

RS232, GPIB, USB

Programming Language

SCPI

SCPI

AC Inputt
Voltage

Frequency

AC110V or AC220V±15℅

48 to 63Hz

AC110V or AC220V±15℅

48 to 63Hz

Net Weight

5.8kg

 


*1. Maximum continuous power available is derated linearly from 100% of maximum at 40oC, to 75% of maximum at 55 oC.

*2. Conductance (S) = 1 / Resistance (Ω)..

*3. The set level is 10 times larger than the slew rate in CCL mode.

*4. The actual transition time is defined as the time required for the input to change from 10% to 90% or from 90% to 10% of the programmed excursion.

*5. Transient frequency depends on the time for high/low level and rising/falling edge.

*6. Full remote control via RS232 with optional GPIB and USB.

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