Applent Instruments AT8611 User manual

User’s Guide
Rev.A1
AT8611/8612
DC ELECTRONIC LOAD
~@ 安柏
®

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AT8611/8612 User's Guide
CERTIFIACTION, LIMITED & LIMITATION OF LIABILITY
Applent Instruments, Inc. （shortened form Applent）certifies that this product met its published specifications
at the time of shipment from the factory. Applent further certifies that its calibration measurements are traceable to
the People’s Republic of China National Institute of Standards and Technology, to the extent allowed by the
Institution’s calibration facility or by the calibration facilities of other International Standards Organization
members.
This Applent instrument product is warranted against defects in material and workmanship for a period
corresponding to the individual warranty periods of its component products. The warranty period is 1 year and
begins on the date of shipment. During the warranty period, Applent will, at its option, either repair or replace
products that prove to be defective. This warranty extends only to the original buyer or end-user customer of a
Applent authorized reseller, and does not apply to fuses, disposable batteries or to any product which, in Applent’s
opinion, has been misused, altered, neglected or damaged by accident or abnormal conditions of operation or
handling.
For warranty service or repair, this product must be returned to a service facility designated by Applent. The buyer
shall prepay shipping charges to Applent and the Buyer shall pay all shipping charges, duties, and taxes for
products returned to Applent from another country.
Applent warrants that its software and firmware designated by Applent for use with an instrument will execute its
programming instruction when properly installed on that instrument. Applent does not warrant that the operation
of the instrument, or software, or firmware, will be uninterrupted or error free.
The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by the
Buyer, Buyer-supplied software or interfacing, unauthorized modification or misuse, operation outside the
environmental specifications for the product, or improper site preparation or maintenance.
THIS WARRANTY IS BUYER’S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL OTHER
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY IMPLIED
WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. APPLENT SHALL
NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES OR
LOSSES, INCLUDING LOSS OF DATA, WHETHER ARISING FROM BREACH OF WARRANTY OR
BASED ON CONTRACT, TORT, RELIANCE ORANY OTHER THEORY.
People’s Republic of China
Jiangsu Province
ChangzhouApplent Instruments Inc.
Oct. 2009
Rev.A1

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Contents
Safety Summary
Warning Dangerous:
The following general safety precautions must be observed during all phases of operation, service, and repair of
this instrument. Failure to comply with these precautions or with specific WARNINGS elsewhere in this manual
may impair the protection provided by the equipment. In addition it violates safety standards of design,
manufacture, and intended use of the instrument.
Disclaimer
The Applent Instruments assumes no liability for the customer's failure to
comply with these requirements.
Ground
The Instrument
To avoid electric shock hazard, the instrument chassis and cabinet must be
connected to a safety earth ground by the supplied power cable with earth
blade.
DO NOT
Operate In An Explosive
Atmosphere
Do not operate the instrument in the presence of inflammable gasses or
fumes. Operation of any electrical instrument in such an environment
constitutes a definite safety hazard.
Keep away
from live circuit
Operating personnel must not remove instrument covers. Component
replacement and internal adjustments must be made by qualified
maintenance personnel. Do not replace components with the power cable
connected. Under certain conditions, dangerous voltages may exist even
with the power cable removed. To avoid injuries, always disconnect power
and discharge circuits before touching them.
Operations not
included in the manual
are forbidden
The protection measurements will be failure while beyond the scope.
Safety Sign:
Provide double insulation or reinforced insulation protection
Waste Electrical and Electronic Equipment (WEEE) order 2002/96/EC
Do not leave in the trash can

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AT8611/8612 User's Guide
Contents
CERTIFIACTION, LIMITED & LIMITATION OF LIABILITY .................................................................... 2
Safety Summary ................................................................................................................................................ 3
Contents..................................................................................................................................................................... 4
Table Contents........................................................................................................................................................... 7
Figure Contents.......................................................................................................................................................... 8
1. Unpacking and Preparation.............................................................................................................................. 10
1.1 Incoming Inspection ........................................................................................................................ 10
1.2 Power requirement........................................................................................................................... 10
1.3 Setting up Fuse ................................................................................................................................ 10
1.4 Environmental Requirements ...........................................................................................................11
1.5 Cleaning............................................................................................................................................11
1.6 How to Remove the Handle............................................................................................................. 12
2. Overview ......................................................................................................................................................... 13
2.1 Introduction...................................................................................................................................... 13
2.2 Main Specification........................................................................................................................... 13
2.3 Features............................................................................................................................................ 14
3. Start up............................................................................................................................................................. 15
3.1 Front panel and rear panel ............................................................................................................... 15
3.2 How to Connect Load...................................................................................................................... 16
3.2.1 General Connection ................................................................................................................. 16
3.2.2 Remote Sensing Connection (4-Wires).................................................................................... 17
3.3 Load Operation Range..................................................................................................................... 18
3.4 Protection Features .......................................................................................................................... 19
3.4.1 Over Voltage ............................................................................................................................ 19
3.4.2 Over Current............................................................................................................................ 19
3.4.3 Over Power.............................................................................................................................. 20
3.4.4 Reverse Voltage ....................................................................................................................... 20
3.4.5 Over Heat................................................................................................................................. 20
4. <MEAS DISPLAY> Page ............................................................................................................................... 21
4.1 Operation Functions......................................................................................................................... 21
4.2 <NRM MEAS PAGE> Page............................................................................................................ 21
4.2.1 Basic Operating mode.............................................................................................................. 22
4.2.2 Input Value............................................................................................................................... 24
4.2.3 How to measure constant current source................................................................................. 24
4.3 <SHT MEAS PAGE> Page ............................................................................................................. 25
4.3.1 Steps of setting up [SHT] mode............................................................................................... 25
4.4 <TRAN MEAS PAGE> Page.......................................................................................................... 26
4.4.1 Steps of setting up TranPara .................................................................................................... 26
4.4.2 Parameter A ............................................................................................................................. 26
4.4.3 Pulse Width A .......................................................................................................................... 27
4.4.4 Parameter B ............................................................................................................................. 27
4.4.5 Pulse Width B .......................................................................................................................... 27

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Contents
4.4.6 Test Mode ................................................................................................................................ 27
4.5 <BAT MEAS PAGE> Page ............................................................................................................. 28
4.5.1 Discharging Current................................................................................................................. 29
4.5.2 Off -Voltage ............................................................................................................................. 29
4.5.3 Sub Parameter.......................................................................................................................... 29
4.6 <SEQ MEAS PAGE> Page ............................................................................................................. 29
4.6.1 SEQ FILE ................................................................................................................................ 30
4.6.2 FILE SET................................................................................................................................. 30
4.6.3 SEQ PARA .............................................................................................................................. 30
4.6.4 TEST MODE........................................................................................................................... 31
4.6.5 STEPS Setup............................................................................................................................ 31
4.7 <SEQ VALUE SET PAGE> Page.................................................................................................... 31
4.7.1 STEP 1 Setup........................................................................................................................... 32
4.8 <ATF MEAS PAGE> Page.............................................................................................................. 32
4.8.1 ATF Files ................................................................................................................................. 33
4.8.2 File Setup................................................................................................................................. 33
4.8.3 V-MAX Setup.......................................................................................................................... 34
4.8.4 I-MAX Setup ........................................................................................................................... 34
4.8.5 P-MAX Setup .......................................................................................................................... 34
4.8.6 STEPS Setup............................................................................................................................ 34
4.9 < ATF VALUE SET PAGE > Page .................................................................................................. 34
4.9.1 STEPS Setup............................................................................................................................ 35
4.9.2 GROUP Setup.......................................................................................................................... 35
4.9.3 STEP 1 Setup........................................................................................................................... 35
4.10 < LED MEAS PAGE > Page........................................................................................................... 37
4.10.1 LED-V ..................................................................................................................................... 38
4.10.2 LED-RES................................................................................................................................. 38
5. [Setup] page..................................................................................................................................................... 39
5.1 <Setup> Page................................................................................................................................... 39
5.1.1 Setting up [Rate]...................................................................................................................... 39
5.1.2 Setting up V-MAX................................................................................................................... 40
5.1.3 Setting up I-MAX.................................................................................................................... 40
5.1.4 Setting up P-MAX................................................................................................................... 40
5.1.5 Setting up V-On Load.............................................................................................................. 40
5.1.6 Setting up V-Off Load.............................................................................................................. 40
5.1.7 Setting up Timing-On Load..................................................................................................... 40
5.1.8 Setting up [Trigger].................................................................................................................. 40
5.1.9 Setting up [4W Test]................................................................................................................ 41
6. System Configuration...................................................................................................................................... 42
6.1 <SYSTEM CONFIG> Page ............................................................................................................ 42
6.2 [Language]....................................................................................................................................... 42
6.3 [Date], [Time].................................................................................................................................. 43
6.4 [Account] , [Password].................................................................................................................... 43
6.5 [Baud Rate]...................................................................................................................................... 44

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AT8611/8612 User's Guide
6.6 RS485 [Address].............................................................................................................................. 44
6.7 <SYSTEM INFO> Page.................................................................................................................. 44
6.8 <System Service> Page ................................................................................................................... 45
7. Remote Control................................................................................................................................................ 46
7.1 About RS-232C ............................................................................................................................... 46
7.2 About USB-Serial Interface (Option).............................................................................................. 47
7.3 To Select Baud Rate......................................................................................................................... 47
7.4 Hand Shake [SHAKE HAND]......................................................................................................... 47
7.5 SCPI Language....................................................................................................................................... 48
8. SCPI Command............................................................................................................................................... 49
8.1 Terminator........................................................................................................................................ 49
8.2 Notation Conventions and Definitions............................................................................................. 49
8.3 Command Structure......................................................................................................................... 49
8.4 Header and Parameters .................................................................................................................... 51
8.5 Command Reference........................................................................................................................ 52
8.6 IDN? Subsystem........................................................................................................................... 52
8.7 FETCH subsystem........................................................................................................................... 53
8.7.1 FETCH:MEASURE................................................................................................................. 53
8.7.2 FETCH: CURRENT................................................................................................................ 53
8.7.3 FETCH: VOLTAGE................................................................................................................. 53
8.7.4 FETCH:POWER...................................................................................................................... 53
8.7.5 FETCH:RESISTANCE............................................................................................................ 54
8.8 BASIC subsystem............................................................................................................................ 54
8.8.1 BASIC:MODE......................................................................................................................... 54
8.8.2 BASIC:FUNC.......................................................................................................................... 54
8.8.3 BASIC:RATE .......................................................................................................................... 55
8.8.4 BASIC:VMAX ........................................................................................................................ 55
8.8.5 BASIC:IMAX.......................................................................................................................... 55
8.8.6 BASIC:PMAX......................................................................................................................... 55
8.8.7 BASIC:STATE......................................................................................................................... 55
8.6.8 BASIC:TRIG............................................................................................................................... 56
8.8.8 BASIC:FW .............................................................................................................................. 56
8.8.9 BASIC:VON............................................................................................................................ 56
8.8.10 BASIC:VOFF .......................................................................................................................... 56
8.8.11 BASIC:TIME........................................................................................................................... 57
8.8.12 BASIC:VALUE ....................................................................................................................... 57
8.9 TRAN subsystem............................................................................................................................. 57
8.9.1 TRAN:CURRENT:VALUEA.................................................................................................. 58
8.9.2 TRAN:CURRENT:VALUEB .................................................................................................. 58
8.9.3 TRAN:VOLTAGE:VALUEA .................................................................................................. 58
8.9.4 TRAN:VOLTAGE:VALUEB................................................................................................... 58
8.9.5 TRAN:POWER:VALUEA ...................................................................................................... 58
8.9.6 TRAN:POWER:VALUEB....................................................................................................... 58
8.9.7 TRAN:RESISTANCE:VALUEA............................................................................................. 58
8.9.8 TRAN:RESISTANCE:VALUEB............................................................................................. 59
8.9.9 TRAN:TRIG............................................................................................................................ 59

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Contents
8.10 SEQ subsystem................................................................................................................................ 59
8.10.1 SEQ:FILE ................................................................................................................................ 59
8.10.2 SEQ:MODE............................................................................................................................. 60
8.10.3 SEQ:REPT............................................................................................................................... 60
8.10.4 SEQ:COUT.............................................................................................................................. 60
8.10.5 SEQ:SAVE............................................................................................................................... 60
8.10.6 SEQ:ERASE............................................................................................................................ 61
8.10.7 SEQ:SET.................................................................................................................................. 61
8.11 ATF subsystem................................................................................................................................. 61
8.11.1 ATF:FILE................................................................................................................................. 62
8.11.2 ATF:VMAX............................................................................................................................. 62
8.11.3 ATF:IMAX .............................................................................................................................. 62
8.11.4 ATF:PMAX.............................................................................................................................. 62
8.11.5 ATF:COUT.............................................................................................................................. 63
8.11.6 ATF:SAVE............................................................................................................................... 63
8.11.7 ATF:ERASE ............................................................................................................................ 63
8.11.8 ATF:SET.................................................................................................................................. 63
8.11.9 ATF:FETCH ............................................................................................................................ 64
8.12 BAT subsystem ................................................................................................................................ 64
8.12.1 BAT:CURRENT ...................................................................................................................... 64
8.12.2 BAT:OFFVOLT ....................................................................................................................... 64
8.12.3 BAT:SECPARA ....................................................................................................................... 64
8.13 LED subsystem................................................................................................................................ 65
8.13.1 LED:VOL................................................................................................................................ 65
8.13.2 LED:RES................................................................................................................................. 65
8.14 TRIG subsystem .............................................................................................................................. 65
8.14.1 TRIG........................................................................................................................................ 66
8.15 PRSC subsystem.............................................................................................................................. 66
8.15.1 PRSC........................................................................................................................................ 66
8.16 SAVE subsystem.............................................................................................................................. 66
8.16.1 SAVE ....................................................................................................................................... 66
9. Specifications................................................................................................................................................... 67
9.1 Basic Specifications......................................................................................................................... 67
9.2 General Specifications..................................................................................................................... 68
9.3 Dimensions...................................................................................................................................... 69
Table Contents
Table 3-1 Front panel description.................................................................................................................... 15
Table 3-2 Rear panel description ..................................................................................................................... 16
Table 7-1 RS-232 connector pin out................................................................................................................ 46
Table 8-1 Multiplier Mnemonics..................................................................................................................... 52
Table 8-2 IDN? Subsystem tree....................................................................................................................... 52
Table 8-3 FETCh Subsystem Command Tree ................................................................................................. 53
Table 8-4 BASIC subsystem tree..................................................................................................................... 54

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AT8611/8612 User's Guide
Table 8-5 TRAN subsystem tree...................................................................................................................... 57
Table 8-6 SEQ subsystem tree......................................................................................................................... 59
Table 8-7 ATF subsystem tree.......................................................................................................................... 61
Table 8-8 BAT subsystem tree...................................................................................................................... 64
Table 8-9 TRIG subsystem tree ....................................................................................................................... 65
Table 8-10 PRSC subsystem tree..................................................................................................................... 66
Table 8-11 SAVE subsystem tree..................................................................................................................... 66
Figure Contents
Figure 1-1 A handle kit is attached to the AT861x:.......................................................................................... 12
Figure 3-1 Front panel..................................................................................................................................... 15
Figure 3-2 Rear panel ...................................................................................................................................... 16
Figure 3-3 Local Sensing................................................................................................................................. 17
Figure 3-4 the remote sensing interface on real panel..................................................................................... 17
Figure 3-5 Remote Sensing ............................................................................................................................. 18
Figure 3-6 Rate power and Power Limit ......................................................................................................... 18
Figure 4-1 Functions of Operation................................................................................................................... 21
Figure 4-2 <NRM MEAS PAGE> Page.......................................................................................................... 22
Figure 4-3 [CC] Mode..................................................................................................................................... 22
Figure 4-4 [CV] Mode..................................................................................................................................... 23
Figure 4-5 [CP] Mode...................................................................................................................................... 23
Figure 4-6 [CR] Mode..................................................................................................................................... 24
Figure 4-7 <SHT MEAS PAGE> Page............................................................................................................ 25
Figure 4-8 <TRAN MEAS PAGE> page......................................................................................................... 26
Figure 4-9 <BAT MEAS PAGE> Page............................................................................................................ 28
Figure 4-10 <SEQ MEAS PAGE> Page.......................................................................................................... 29
Figure 4-11 <Sequence List Effective Value Setup> Page .............................................................................. 31
Figure 4-12 <ATF MEAS PAGE> Page....................................................................................................... 33
Figure 4-13 < ATF VALUE SET PAGE > Page............................................................................................ 34
Figure 5-1 <Setup> Page................................................................................................................................. 39
Figure 6-1 <System Configuration> Page....................................................................................................... 42
Figure 6-2 <System information> Page........................................................................................................... 44
Figure 7-1 The RS-232 connector in the real panel ...................................................................................... 46
Figure 8-1 Command Tree Example ......................................................................................................... 49

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Contents

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AT8611/8612 User's Guide
1. Unpacking and Preparation
This chapter describes how to set up and start the AT8612.
Incoming Inspection
Power Requirements
Setting up the Fuse
Environmental Requirements
Cleaning
How to Remove the Handle
1.1 Incoming Inspection
After you have receive the instrument, carry out inspection during unpacking according
to the following procedures.
WARNING
If the outside of the instrument (such as the cover, front/rear panel, LCD screen, power
switch, and port connectors) appears to be damaged during transport, do not turn on the
power switch, in case you get an electrical shock.
Check whether the packing box or shock-absorbing material used to package the
instrument has been damaged.
Referring to <Packing List>in the packing box, check whether all packaged items
supplied together with the meter have been provided as per the specified optioned.
1.2 Power requirement
~Line: 110V/220VAC
Frequency: 47-440Hz
Power: <20VA
1.3 Setting up Fuse
Please use the following fuse type.
UL/CSAtype, Slow-Blow, 5×20-mm miniature fuse, 0.5A, 250 V
To verify and replace the fuse, remove the power cable and pull out the fuse holder.
Two fuses in Fuse Holder.

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Unpacking and Preparation
1.4 Environmental Requirements
Set up the AT8612 according to following environmental requirements.
Operating Environments
Ensure the operating environment meets the following requirements.
Temperature: 0C to 55C
Temperature range at calibration: 23C±5C (<1C deviation from the temperature
when performing calibration)
Humidity: 15% to 85% at wet bulb temperature ≤40°C (non-condensation)
Altitude: 0 to 2,000m
Vibration: Max. 0.5 G, 5 Hz to 500 Hz
1.5 Cleaning
To prevent electrical shock, disconnect the AT861x power cable from the receptacle
before cleaning.
Use dry clothes slightly dipped in water to clean the case.
Do not attempt to clean the internal of theAT861x.
WARNING:
Don’t Use Organic Solvents (such as alcohol or gasoline) to clean the Instrument.

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AT8611/8612 User's Guide
1.6 How to Remove the Handle
Figure 1-1 A handle kit is attached to the AT861x:
1 Retracted

3 Carrying Position

2 Extended
Remove Handle（Lift the handle perpendicular to the unit while pulling it in the direction of 1.）

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Overview
2. Overview
This chapter is organized as follows
Introduction
Main Specifications
Feature overview
2.1 Introduction
Thank you for purchasingAT861x DC Electronic Load.
AT861x DC Electronic load adopts high-performance ARM microprocessor with
multiple processors. It has superior speed and performance. AT861x offers four load
modes (CC, CV, CP, CR), and there are 7 modes of measurement function: NRM, TRN,
SEQ, ATF, BAT, SHT and LED.
You can use the built-in file editor or RS232 and USB interface to edit the order list and
list file automatically, and complete high-efficient measurement. In addition to testing
linear power supply and switching power supply, AT861x can better test battery charger
and batteries, it can meet the requirements of power supply factories and related
factories.
2.2 Main Specification
DC INPUT RATE: AT8612: 300W/150V/30A
CONSTANT CURRENT: 0~30A
0~3A: Resolution: 0.0001A, Accuracy: 0.1%
0~30A: Resolution: 0.001A, Accuracy: 0.2%
CONSTANT VOLTAGE: 0~150V
0~18V: Resolution: 0.001V, Accuracy: 0.05%
0~150V: Resolution: 0.01V, Accuracy: 0.05%
CONSTANT POWER: 0~300W
0~100W: Resolution: 0.001W, Accuracy: 1%
>100W: Resolution: 0.01W, Accuracy: 1%
CONSTANCE RESISTANCE: 0 ~ 4000
0~100  : Resolution: 0.01, Accuracy: 1%
>100  : Resolution: 0.1, Accuracy: 1%
Accuracy of voltmeter: 0.05%
Accuracy of ammeter: 0.1%
25kHz dynamic Testing
Battery test function
Maximum time 1000 hours, can display maximum 999.99AH capacity, display of
discharge time is available.
Test speed
Fast 10t/s, Medium 5t/s, Slow 3t/s

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AT8611/8612 User's Guide
Trigger
Internal trigger, BUS trigger, External trigger
Independent multi-file
There are 10 files available for both sequence list files and automatic list files, 20
files in total.
2.3 Features
3.5 inches true color LCD display
Operation Mode:
NORMAL (CC/CV/CP/CR),
TRANSIENT (TRN),
SEQUENCE LIST (SEQ),
AUTOMATIC TESTING FUNCTION (ATF),
BATTERY TESTING FUNCTION (BAT)
SHORT CIRCUIT TEST (SHT).
LED TESTING FUNCTION (LED).
4-wires test function
Interface:
1. Triggered Input Interface.
2. Built-in RS-232C Interface
Use 3-wire serial port, compatible with SCPI command and ASCII transfer.
3. RS485 interface (optional)
Support multi-instrument communication.

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Start up
3. Start up
This chapter describes:
1. The front panel and rear panel
2. How to connect withAT8612
3.1 Front panel and rear panel
Figure 3-1 Front panel
2
3
1
456
8
9
10
输入
INPUT + -
7
Table 3-1 Front panel description
No.
Description
1
USB disk interface (optional)
2
Trigger key
3
Power switch
4
System function keys:
Turn load on/off, system and keypad lock.
5
Function soft-key
6
Main function key:
Measurement and setup
7
Input Terminals
8
Numeric keys
9
Cursor keys
10
LCD display screen

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AT8611/8612 User's Guide
Figure 3-2 Rear panel
1 2
3
Table 3-2 Rear panel description
NO.
Description
1
Handler interface. (Include External Trigger Input and Remote Sense)
2
RS232C interface
3
Power socket and fuse holder
3.2 How to Connect Load
WARNING
FIRE HAZARD
To satisfy safety requirements, load wires must be heavy enough to not overheated
while carrying the short-circuit output current of the device connects to AT861x.
3.2.1 General Connection
Input connections are made to the + and - binding posts on the front panel. A major
consideration in making input connections is the wire size.
The minimum wire size required to prevent overheating may not be large enough to
maintain good regulation. Stranded, copper wires are recommended to use. The wires
should be large enough to limit the voltage drop no more than 0.5 V per lead.

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Start up
Figure 3-3 Local Sensing
INPUT + -
OUTPUT
+ -
TIE
WRAPS
DC Power Supply
(CV SOURCE)
WARNING
Before connecting to the measured power supply, make sure the measured power supply is
outage, and there is no voltage in the output end, otherwise it will cause electric spark.
Please connect load according to polarity.
If the load consume too much current, line resistance can't be ignored, recommend to use 4W
remote sensing method to make measurement.
3.2.2 Remote Sensing Connection (4-Wires)
The remote sense terminals of AT861x are connected to the output of the power supply.
Remote sensing compensates for the voltage drop in applications require long lead lengths.
Before using remote sensing connections, you must set the 4W to ON state under
[SETUP] page.
Remote sensing at the rear panel of the instrument:
Figure 3-4 the remote sensing interface on real panel.

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AT8611/8612 User's Guide
+-
GND
TRIG
SENSE
TRIGGER
Figure 3-5 Remote Sensing
INPUT + -
OUTPUT
+ -
TIE
WRAPS
DC POWER SOURCE
REAL
PANEL
+-
+
-
3.3 Load Operation Range
Figure 3-6 Rate power and Power Limit

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Start up
Input
Voltage(V)
Input Current (I)
Rated Power
Rated
Voltage
Rated Current
Input
Voltage(V)
Input Current (I)
Rated
Voltage
Rated Current
Current Limit
Power Limit
3.4 Protection Features
To maximize protect the measured power supply, AT861x includes five protection
features.
3.4.1 Over Voltage
Load input will be turned OFF immediately if input voltage exceeds the 105%*V-MAX,
load overvoltage alerts, voltage value glitters.
When input voltage exceed 110%, load input is turned off and display [OV], the buzzer
beeps.
WARNING
1. Don't input voltage that exceeds rated voltage, over voltage protection is dangerous for load.
2. NOTE: In the setup page, over voltage protection only provide [OV] and buzzer beeping.
3. Suggestion: Make sure there’s no over voltage happened before enter all setup pages.
4. Over voltage, the load input will be turned off under any mode.
3.4.2 Over Current
In the CV mode, when input current exceeds I-MAX, load over-current alerts, current
value glitters and the buzzer beeps. Once input current exceeds 102%, load input is
turned off and display [OC].
When work in the CR or CC and CP mode, input current is ascending continuously and
the load current will be limited to I-MAX , load over current alerts, current value glitters
(but the buzzer does not beep). Load will work in the OC protection state.

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AT8611/8612 User's Guide
3.4.3 Over Power
CV mode:
If the input power exceeds the power limit (101%*P-MAX), load will work under
over-power protection state and the buzzer beeps, current value flashed and [OP]
displayed.
If the input power exceeds the power limit (102%*P-MAX), load will be turned off.
CC, CP and CR mode:
If the input power exceeds the power limit (102%*P-MAX), load will work under
over-power protection state and voltage and current value flashed, but the buzzer is
silent.
3.4.4 Reverse Voltage
This feature protects the load module in case of the input DC voltage lines are connected
with wrong polarity.
Once the reverse voltage condition detected, buzzer beeps and [RV] displayed, and input
will be turned off immediately.
3.4.5 Over Heat
Once the load internal power devices’ temperature exceeds the safe limits (80C), load
input will be turned off, [OH] will be displayed and buzzer beeps.