Location:＋Instrument＋372X Series

Introductionㄩ

372X series 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.
Featuresㄩ
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;
  • The innovative CP mode can test voltage sources, current sources, and effectively prevent short-circuits as well when the tested power is insufficient;

  • 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
3722A
3723A
 3724A

Input Ratings

Current

Voltage

Power*1

0~30A

0~80V

250W at 40oC

0~40A

0~80V

400W at 40oC

0~20A

0~200V

200W at 40oC

0‵30A

0‵200V

350W at 40oC

0‵20A

0‵500V

0‵250W

Input Characteristics

Input Characteristics

Minimum Operation Voltage@Full Scale Current

0.6V

0.6V
1.2V
1.2V
 2V

Constant Current Mode

LowRange

Resolution

Accuracy

0~3A

0.1mA

0.1沁+5mA

0~4A

0.1mA

0.1沁+5mA

0~2A

0.1mA

0.1沁+5mA

0~3A

0.1mA

0.1沁+5mA

0‵2A

0.1mA

0.1%+5mA

HighRange

Resolution

Accuracy

0‵30A

1mA

0.1沁+10mA

0~40A

1mA

0.1沁+10mA

0~20A

1mA

0.1沁+10mA

0~30A

1mA

0.1沁+10mA

0‵20A

1mA

0.1%+10mA

Constant Voltage Mode

Range

Resolution

Accuracy

0~80V

1mV

0.1沁+10mV

0~80V

1mV

0.1沁+10mV

0~200V

2mV

0.1沁+25mV

0~200V

2mV

0.1沁+25mV

0‵500V

5mV

0.1%+62.5mV

Constant Resistance Mode

LowRange

Resolution

Accuracy

0.02~2次

0.1m次

0.5沁+12m次 @I>4A

0.02~2次

0.1m次

0.5沁+12m次 @I>4A

0.0666~6.66次

0.1m次

0.5沁+40m次@I>3A

0.0666~6.66次

0.1m次

0.5沁+40m次@I>3A

0.125‵12.5次

0.1m次

0.5%+150m次 @Iˇ2A

MiddleRange

Resolution

Accuracy

2~200次

8.6uS*2

0.3沁+1.25mS@V>8V

2~200次

8.6uS

0.3沁+1.25mS@V>8V

6.66~666次

2.6uS*2

0.3沁+375mS@V>20V

6.6~666次

2.6uS*2

0.3沁+375mS@V>20V

12.5‵1250次

13.8uS

0.3%+1mS @Vˇ50V

HighRange

Resolution

Accuracy

20~2000次

0.96uS

0.3沁+0.625mS@V>8V

20~2000次

0.96uS

0.3沁+0.625mS@V>8V

66.6~6660次

0.29uS

0.3沁+188uS@V>20V

66.6~6660次

0.29uS

0.3沁+188uS@V>20V

125‵12500次

1.54uS

0.3%+0.5mS @Vˇ50V

Constant Power Mode

Range

Resolution @P<100W

@P≡100W

Accuracy

0~250W

1mW

10mW

0.2沁+600mW

0~400W

1mW

10mW

0.2沁+600mW

0~200W

1mW

10mW

0.2沁+600mW

0~350W

1mW

10mW

0.2沁+600mW

0‵250W

1mW

10mW

0.2%+600mW

Current Measurement

LowRange

Resolution

Accuracy

0~3A

0.1mA

0.05沁+4mA

0~4A

0.1mA

0.05沁+4mA

0~2A

0.1mA

0.05沁+4mA

0~3A

0.1mA

0.05沁+4mA

0‵2A

0.1mA

0.05%+4mA

HighRange

Resolution

Accuracy

0~30A

1mA

0.05沁+8mA

0~40A

1mA

0.05沁+8mA

0~20A

1mA

0.05沁+8mA

0~30A

1mA

0.05沁+8mA

0‵20A

1mA

0.05%+8mA

Voltage Measurement

Range

Resolution

Accuracy

0~80V

1mV

0.1沁+8mV

0~80V

1mV

0.1沁+8mV

0~200V

1mV

0.1沁+50mV

0~200V

1mV

0.1沁+50mV

0‵500V

1mV

0.1%+200mV

Power Measurement

Range

Resolution @P<100W

@P≡100W

Accuracy

0~250W

1mW

10mW

0.1沁+600mW

0~400W

1mW

10mW

0.1沁+600mW

0~200W

1mW

10mW

0.1沁+600mW

0~350W

1mW

10mW

0.1沁+600mW

0‵250W

1mW

10mW

0.1%+600mW

Current Slew Rates

RangeCCH

CCL*3

1mA/us~3A/us

100uA/us~300mA/us

1mA/us~4A/us

100uA/us~400mA/us

1mA/us~2A/us

100uA/us~200mA/us

1mA/us~3A/us

100uA/us~300mA/us

1mA/us‵2A/us

100uA/us‵200mA/us

Resolution

1mA/us

1mA/us
1mA/us
1mA/us
 1mA/us

Accuracy*4

3% + 10us

3% + 10us
3% + 10us
3% + 10us
 3% + 10us

Transient Operation

Transient Mode

Continuous, Pulse, Toggled

Continuous, Pulse, Toggled
Continuous, Pulse, Toggled
Continuous, Pulse, Toggled
 Continuous, Pulse,
Toggled

FrequencyRange*5

0.38Hz~50kHz

0.38Hz~50kHz

0.38Hz~50kHz

0.38Hz~50kHz

 0.38Hz‵50kHz

High/Low Time

Resolution

Accuracy

0~655.35ms

10us

0.2沁+10us

0~655.35ms

10us

0.2沁+10us

0~655.35ms

10us

0.2沁+10us

0~655.35ms

10us

0.2沁+10us

0‵655.35ms

10us

0.2%+10us

Rising/Falling Time

Resolution

Accuracy

10us~655.35ms

10us

0.2沁+10us

10us~655.35ms

10us

0.2沁+10us

10us~655.35ms

10us

0.2沁+10us

10us~655.35ms

10us

0.2沁+10us

10us‵655.35ms

10us

0.2%+10us

List Characteristics

Step Time

Resolution

Accuracy

10us~100000s

10us

0.2沁+10us

10us~100000s

10us

0.2沁+10us

10us~100000s

10us

0.2沁+10us

10us~100000s

10us

0.2沁+10us

10us‵100000s

10us

0.2%+10us

Number of Steps

1~50

1~50

1~50

1~50

 1‵50

Cycle

1~65535

1~65535

1~65535

1~65535

 1‵65535

StoreCapacity

7 lists

7 lists

7 lists

7 lists

 7 lists

Expanded Functions

Chain

Chain

Chain

Chain

 Chain

Battery Discharge

Discharge Time

Resolution

Accuracy

1s~100h

1s

0.2沁+1s

1s~100h

1s

0.2沁+1s

1s~100h

1s

0.2沁+1s

1s~100h

1s

0.2沁+1s

1s‵100h

1s

0.2%+1s

BatteryCapacity

Resolution

Accuracy

1mAh~3000Ah

1mAh

0.3沁+0.01Ah

1mAh~4000Ah

1mAh

0.3沁+0.01Ah

1mAh~2000Ah

1mAh

0.3沁+0.01Ah

1mAh~3000Ah

1mAh

0.3沁+0.01Ah

1mAh‵2000Ah

1mAh

0.3%+0.01Ah

Short Circuit

CCL Mode

CCH Mode

CV Mode

CRL Mode

CRM Mode

CRH Mode

CPV Mode

CPC Mode

3.3A

33A

0V

0.018次

1.8次

18次

270W

0W

4.4A

44A

0V

0.018次

1.8次

18次

420W

0W

2.2A

22A

0V

0.06次

6次

60次

220W

0W

3.3A

33A

0V

0.06次

6次

60次

370W

0W

2.2A

22A

0V

0.12次

12次

120次

270W

0W

Maximum Slew Rate

Current

Voltage

3A/us

0.6V/us

4A/us

0.6V/us

2A/us

0.6V/us

3A/us

0.6V/us

2A/us

0.6V/us

Programmable Open Circuit

≡20k次

≡20k次
≡20k次
≡20k次
 ≡20k次

Trigger Input

Trigger Level

Trigger Pulse Width

TTL falling edge

≡10us

TTL falling edge

≡10us

TTL falling edge

≡10us

TTL falling edge

≡10us

TTL falling edge

≡10us

Maximum Input Levels

Current

Voltage

33A

84V

44A

84V

22A

210V

33A

210V

22A

525V

Protection Features

OV, OC,OP,OT, RV

OV, OC,OP,OT, RV
OV, OC,OP,OT, RV
OV, OC,OP,OT, RV
 OC, OV, OT, OP, RV

Reverse Current Capacity

Input OFF

InputON

25A

40A

30A

50A

25A

35A

25A

40A

25A

35A

Ripple and Noise

Current(rms/p-p)

Voltage(rms)

3mA/30mA

5mV

3mA/30mA

5mV

3mA/30mA

12mV

3mA/30mA

12mV

3mA/30mA

30mV

Environmental Conditions

Temperature

Relative Humidity

0~50oC

≒85沁

0~50oC

≒85沁

0~50oC

≒85沁

0~50oC

≒85沁

0‵50oC

≒85%

Remote Interface*6

RS232, GPIB, USB

RS232, GPIB, USB

RS232, GPIB, USB

RS232, GPIB, USB

 RS232, GPIB, USB

Programming Language

SCPI

SCPI

SCPI

SCPI

 SCPI

AC Input

Voltage

Frequency

AC110V or AC220V㊣15沁

48 to 63Hz

AC110V or AC220V㊣15沁

48 to 63Hz

AC110V or AC220V㊣15沁

48 to 63Hz

AC110V or AC220V㊣15沁

48 to 63Hz

AC110V or AC220V㊣15%

48 to 63Hz

Net Weight

5.8kg

5.8kg

5.8kg

5.8kg

 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 (次).

*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.