BEICH CH9720 Series User manual

OPERATION MANUAL

CH9720 Series Programmable DC

Electronic Load

BEICH ELECTRONIC TECHNOLOGY CO.,LTD.

Declaration

Note：

The right of the manual is belonged to Changzhou Beich Electronic Co., Ltd, which reserves all

rights. Any printing, copy or translate can’t be done without the authorization of Beich.

The manual is available for CH 9720 Series Programmable DC Electronic Load

Any information contained in the manual is subject to change without notice

The latest version can be downloaded from our website：

http://www.beich.com.cn

June, 2017 ……………………………………..1st Edition

September, 2017………………………………..2st Edition

The descriptions contained in this manual may not cover all information about this instrument.

Introductions to the improvements of the instrument in performance, function, internal structure,

outer appearance, accessories, packing material, etc. are subject to change without notice. If you find

any inconformity of this manual with our instruments, please contact us for further consultation by

the address listed on the cover.

CH9720 Operation Manual chapter 1 Unpacking

Content

Content.......................................................................................................................................................... I

CHAPTER 1 UNPACKING........................................................................................... 3

1.1Unpacking...............................................................................................................................................3

1.2Power supply.......................................................................................................................................... 3

1.3 Fuse..........................................................................................................................................................3

1.4Power connection................................................................................................................................... 3

1.5 Environment.........................................................................................................................................4

1.6 Startup.................................................................................................................................................. 4

CHAPTER 2 DESCRIPTION........................................................................................ 5

2.1 Product introduction..............................................................................................................................5

2.2 Technical parameter.............................................................................................................................. 6

2.3 Front panel..............................................................................................................................................7

2.4 Rear panel...............................................................................................................................................8

2.5 Display.....................................................................................................................................................8

CHAPTER 3 MENU OPERATION.............................................................................10

3.1 Normal page......................................................................................................................................... 10

3.1.1Test operation in normal page..........................................................................................................11

Constant current mode (CC).................................................................................................................... 11

Constant voltage mode (CV)................................................................................................................... 11

Constant power mode (CP)......................................................................................................................12

Constant resistance mode (CR)................................................................................................................ 12

CC+CV mode..............................................................................................................................................13

CR+CV mode..............................................................................................................................................13

3.2 Set page................................................................................................................................................. 13

3.2.1Load Setup....................................................................................................................................... 14

CH9720 Operation Manual chapter 1 Unpacking

Remote test.............................................................................................................................................. 14

Auto off....................................................................................................................................................14

Current range........................................................................................................................................... 14

Max. Current............................................................................................................................................15

Voltage range........................................................................................................................................... 15

Max. Voltage............................................................................................................................................ 15

On voltage................................................................................................................................................15

Off voltage............................................................................................................................................... 16

Rise rate................................................................................................................................................... 16

Fall rate.................................................................................................................................................... 16

3.2.2 Limit Set......................................................................................................................................... 16

3.2.3 System Setup Page..........................................................................................................................17

3.2.4 File List........................................................................................................................................... 18

Save and load........................................................................................................................................... 18

Save file to U disk....................................................................................................................................19

File list..................................................................................................................................................... 20

3.2.5Battery Test Set................................................................................................................................ 21

3.2.6 Tran test (Dynamic Test).................................................................................................................22

3.2.7 List Test...........................................................................................................................................23

3.2.8LED Test.......................................................................................................................................... 25

3.2.9 System Info..................................................................................................................................... 25

3.2.10 Calibration.................................................................................................................................... 26

3.2.11 Firmware update........................................................................................................................... 26

APPENDIX AREMOTE TEST AND TRIGGER........................................................27

A1 Remote test......................................................................................................................27

A2 External trigger......................................................................................................................27

A3 Pin configuration......................................................................................................................27

APPENDIX B REMOTE CONTROL..........................................................................29

A.1 RS232C remote control system.......................................................................................................... 29

A.2 USB remote control system................................................................................................................ 30

A.3 Data format..........................................................................................................................................32

CH9720 Operation Manual Chapter 2 Description

Chapter 1 Unpacking

Thanks for your purchase, please inspect the packing list along with the product, if anything

missed, please contact us.

1.1Unpacking

Inspect the shipping container for damage after unpacking it. It is not recommended to power on the

instrument in the case of a damage container.

If the contents in the container do not conform to the packing list, notify us or your dealer.

Standard Accessary

QTY

Note

CH972X DC Load

According to order

Power plug

Different in different countries

Fuse

250V/1A,Slow-Blow

Manual

Test report

1.2Power supply

Inspect the following items：

Requirement

Voltage

220/110(1±10%)V AC

Frequency

47∼63Hz

Max. Power consumption

30VA

1.3 Fuse

Specification：250V/1A (Slow-Blow),520mm

The fuse is a standard configuration, so use the included custom fuse please.

1.4Power connection

1) Power supply: 90V to 240V (dependable on the voltage setup on the rear panel).

2) Power supply frequencies: 50Hz and 60Hz

3) Power supply power range: ≤30VA

4) L (line wire), N (neutral wire) and E (earth ground wire) of the power supply input socket

should correspond to the power plug of the instrument.

5) The instrument has been specially designed for decreasing noise jamming caused by the input

in AC power terminal, but it is also recommended to use it in the environment of low noise. If

CH9720 Operation Manual Chapter 2 Description

noises cannot be avoided, install a power source filter please.

WARNING: To avoid injury to personnel and damage to the instrument resulting from electric

shock, do sure that the earth ground wire is safely grounded.

1.5 Environment

1．Do not store or use the instrument where it could be exposed to many dusts, great

vibration, direct sunshine and corrosive gas.

2．The instrument should operate under the temperature ranging from 0℃to 40℃,

relative humidity of no greater than 75%. For high accuracy, use the instrument in the

environment above mentioned.

3．For high accuracy, do not block the left air vent so as to ensure good ventilation.

4．The instrument has been specially designed for decreasing noise jamming caused by

the AC power input, but it is also recommended to use it in the environment of low

noise. If noise cannot be avoided, install a power filter please.

5．If the instrument will not be used for a long time, please place it in the original or a

similar packing box. The environment temperature should be kept in the range of 5℃

to 40℃, and the relative humidity should not be greater than 85%. The box should be

located in an airy room where it could be exposed corrosive impurities and direct

sunlight.

6．Test leads on the instrument that are connected to DUTs should be kept away from

strong electromagnetic fields to avoid interference.

1.6 Startup

Press the start key on the left corner, then the power is connected, then self-inspection, load the

configuration information and initialization.

Please remove the power plug from the socket when not using for long time.

CH9720 Operation Manual Chapter 2 Description

Chapter 2 Description

2.1 Product introduction

CH9720X series electronic load is the new generation high performance

multi-function DC electronic load based on the professional accumulation in the field of

electronic load and wide users. The high performance ARM processor with high speed

sampling AD is adopted, so it can simulate the load feature of different power supply.

4.3 inch TFT display supports Chinese&English operation, matched with guided menu,

make the operation easier. The displayed information is rich and direct. With the

resolution of 0.0001, the voltage and current details can be monitored more

accurate.USBHOST(available for 9720BU/9720CU) can be used to save data,also for

firmware update. The comparator function with HANDLER interface can ensure the

batch test and systemization test. The load function is rich: CC, CV, CP, CR,

CR-LED(Simulate the characteristic of driver),battery discharge function(Display the

real-time discharge curve), transient test(Test the dynamic output performance of power

supply) , list test(Test the performance of the power supply under different condition).

The flexible soft and hard frame can meet the demand of group test so that to improve

the test efficiency. The smart fan control and excellent dispersion performance with the

protection alarm steps like over voltage, over current, over power, over heat and reverse

voltage polarity can make the instrument more reliable and safer. It is easier to connect

with computer for real time sampling collection and control with SCPI.

The electronic load can be widely applied for the production line of power

transformer, charger, switch power and battery, and the research field like lab.

CH9720 Operation Manual Chapter 2 Description

2.2 Technical parameter

Model

CH9720B

9720BU

CH9720C

CH9720CU

Rated value

Input voltage

0~360V

Input current

1mA~30A

Input power

150W

300W

Range

Accuracy

Resolution

Load accuracy

0-36V

±（0.05%+0.03%FS）

1mV

0-360V

±（0.05%+0.03%FS）

10 mV

0-3A

±（0.05%+0.05%FS）

0.1 mA

0-30A

±（0.05%+0.05%FS）

1 mA

CV mode

1.5V-36V

±（0.05%+0.03%FS）

1mV

1.5V-360V

±（0.05%+0.03%FS）

10mV

CC mode

0-3A

±（0.05%+0.05%FS）

0.1 mA

0-30A

±（0.05%+0.05%FS）

1mA

CR mode(when

input voltage

and current ≥

10%FS)

0.05Ω-5Ω

±（0.2%+0.2%FS）

0.001Ω

0.5Ω-50Ω

±（0.1%+0.1%FS）

0.01Ω

5Ω-500Ω

±（0.1%+0.1%FS）

0.1Ω

500Ω-5KΩ

±（1%+1%FS）

1Ω

CP mode(when

input voltage

and current ≥

10%FS)

0-50W

±（0.1%+0.1%FS）

1 mW

0-150W

±（0.1%+0.1%FS）

10 mW

0-300W

±（0.1%+0.1%FS）

0.1 W

Voltage test

accuracy

0-9.9999V

±（0.05%+0.03%FS）

0.1mV

10.000-99.999V

±（0.05%+0.03%FS）

1mV

100.00-360.00V

±（0.05%+0.03%FS）

10mV

Current test

accuracy

0-9.9999A

±（0.05%+0.05%FS）

0.1 mA

10.000-30.000

±（0.05%+0.05%FS）

1mA

U-disk Data

Save

Unavailable

Available

Unavailable

Available

U-disk Firmware

update

Available

Battery test

function

Input voltage= 0.8-360V Max.Capacity= 999A/H

Resolution=0.1mA Discharge time=1~

60000

sec

Transient test mode

T1&T2（Test time of value A or B）：0.1mS-999S Error＜2.5% + 0.1mS

Protective range

＞rated condition 5%

Input impedance

≥200KΩ

Dimension

W*H*D 230mm*100mm*350mm

Weight

CH9720B/BU 6Kg CH9720C/CU 6.5Kg

-------------------------------------------------------------------------------------------------------------------------

CH9720 Operation Manual Chapter 2 Description

2.3 Front panel

No.

Name

Description

Power

Turn on and off the load.

USB HOST

Connect USB disk. Support FAT16 and FAT 32.Firmware

update, data storage and load, save screen imagine(Only

available for CH9720BU/9720CU)

Operation

ON：Start up the load test.

SAVE：Save the data to U disk, the light is blinding when data

is recording (Only available for CH9720BU/9720CU)

LCD display

Display test result, condition and system information.

Input

Full-functional numerical keyboard, used to input data, or

character for file name.

Knob

Right-left adjustment for setting data and menu operation

Input terminal ：red is

positive and black is

negative

Reversed polarity input will cause big

current, dangerous

Soft key

The function of 5 keys is changed as function page, which is

not fixed. In different menu, there is different function. The

function is displayed on the top of the key .

CH9720 Operation Manual Chapter 2 Description

2.4 Rear panel

No.

Name

Description

1,2

Cooling hole

Please not block and keep cooling

Voltage switcher

Switch 110V and 220V

AC input 

1A fuse is inside of 

Remote test and trigger

input interface

The configuration of pin is referred to appendix A

RS232C interface

Communicate with external device, parameter setting and

command can be set and obtained by PC to realize remote

control.

2.5 Display

LCD display is divided into fixed zones, the information is as below.

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