Applent Instruments AT526 User manual

User’s Guide
Rev.A4 AT526
BatteryInternalResistanceMeter
ACR： 0.001mΩ~ 33.000kΩ
DCV: 0.00000V~120.000VDC
Measurement Speed: 6.8 ms
~@
®
Applent Instruments Inc.
Address: Dangnan Industrial Zone,
Changzhou, Jiangsu, China (PRC)
Post Code: 213014
Tel: [phone]
Fax: [phone]
Sales Email: [email protected]
Tech Email: [e-mail]
http://www.applent.com

2 AT526 User's Guide
CERTIFICATION,LIMITEDWARRANTY,&LIMITATIONOF
LIABILITY
Applent Instruments, Ltd. （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 Applent shall pay shipping charges to return the product to the Buyer.
However, 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 OR ANY OTHER THEORY.
Applent Instruments, Ltd.
Changzhou,
Jiangsu,
China,
Rev.A2 January, 2005
Rev.B0 January, 2008

3
Contents
Contents
CERTIFICATION, LIMITED WARRANTY, & LIMITATION OF LIABILITY ..................................................... 2
Contents..................................................................................................................................................................... 3
Figure Contents.......................................................................................................................................................... 5
Table Contents ........................................................................................................................................................... 5
1.Unpacking and Preparation................................................................................................................................ 6
1.1Incoming Inspection .......................................................................................................................... 6
1.2Power requirements and setting up Fuse ........................................................................................... 6
1.3Environmental Requirements ............................................................................................................ 6
1.4Cleaning............................................................................................................................................. 7
1.5How to Remove the Handle............................................................................................................... 7
2.Overview ........................................................................................................................................................... 9
2.1Introduction........................................................................................................................................ 9
2.2Main Specifications and Features ...................................................................................................... 9
2.3Main Functions ................................................................................................................................ 10
2.3.1Correction ................................................................................................................................ 10
2.3.2Comparator (Sorting Function)................................................................................................ 10
2.3.3System Setup ........................................................................................................................... 10
2.3.4Remote Control........................................................................................................................ 10
3.Startup...............................................................................................................................................................11
3.1Front panel........................................................................................................................................11
3.2Rear Panel.........................................................................................................................................11
3.3Power On/Off................................................................................................................................... 12
3.3.1Line Power Connection ........................................................................................................... 12
3.4Warm-up Time ................................................................................................................................. 12
3.5Connect to Device under Test (DUT) .............................................................................................. 12
4.<Meas> Key .................................................................................................................................................... 13
4.1<MEAS DISPLAY> Page ............................................................................................................... 13
4.1.1[TRIGGER] ............................................................................................................................. 13
4.1.2[RANGE]................................................................................................................................. 14
4.1.3Measurement Speed [SPEED] ................................................................................................. 15
4.1.4[BEEP] Feature........................................................................................................................ 15
4.2Status Bar on <MEAS DISPLAY>.................................................................................................. 15
4.2.1Icons on <MEAS DISPLAY>.................................................................................................. 16
4.2.2[VIEW DATA] Soft-key .......................................................................................................... 16
4.2.3[SAVE DATA] Soft-key........................................................................................................... 16
4.3<VIEW DATA> page....................................................................................................................... 16
5.[SETUP] Key................................................................................................................................................... 17
5.1< SETUP> page ............................................................................................................................... 17
5.2Short-circuit Clear Zero [CLEAR ZERO]....................................................................................... 17
5.3Comparator Mode [R-COMP],[V-COMP] ...................................................................................... 18
5.3.1Comparator Nominal [R-NOMINAL],[V-NOMINAL]........................................................... 18
5.3.2Limit [R-LOWER] [R-UPPER] [V-LOWER], [V-UPPER] .................................................... 18
6.<SYSTEM CONFIG> page............................................................................................................................. 20
6.1<SYSTEM CONFIG> page............................................................................................................. 20
6.1.1[LANGUAGE] ........................................................................................................................ 20
6.1.2[ACCOUNT], [PASSWORD] ................................................................................................. 21
6.1.3[DATE], [TIME] ...................................................................................................................... 21
6.1.4RS232 [BAUD] rate................................................................................................................. 22
6.1.5RS-232 Shake Hand [SHAKE HAND] ................................................................................... 22
6.1.6RS-232 Result Send Mode [RESULT SEND] ......................................................................... 22
6.2<SYSTEM INFORMATION>......................................................................................................... 23
6.3<SYSTEM SERVICE> page ........................................................................................................... 23
7.Handler Interface ............................................................................................................................................. 24
7.1Pin Assignment ................................................................................................................................ 24

4 AT526 User's Guide
7.2Power Rating ................................................................................................................................... 25
7.3Electrical Characteristics ................................................................................................................. 25
7.3.1Input Signal:............................................................................................................................. 25
7.3.2Output Signal:.......................................................................................................................... 25
7.3.3Power supply ........................................................................................................................... 25
7.3.4Schematic................................................................................................................................. 25
8.Remote Control................................................................................................................................................ 27
8.1About RS-232C ............................................................................................................................... 27
8.2About USB-Serial Interface (Option) .............................................................................................. 28
8.3To Select Baud Rate......................................................................................................................... 28
8.4SCPI Language ................................................................................................................................ 28
9.Command Reference ....................................................................................................................................... 30
9.1Terminator........................................................................................................................................ 30
9.2Notation Conventions and Definitions............................................................................................. 30
9.3Command Structure ......................................................................................................................... 30
9.4Header and Parameters .................................................................................................................... 31
9.5Command Reference ....................................................................................................................... 32
9.6DISPlay Subsystem ......................................................................................................................... 32
9.6.1DISP:PAGE ............................................................................................................................. 32
9.6.2DISP:LINE .............................................................................................................................. 33
9.7FUNCtion Subsystem ...................................................................................................................... 33
9.7.1FUNCtion:RANGe .................................................................................................................. 33
9.7.2FUNCtion:RANGe:MODE ..................................................................................................... 33
9.7.3FUNCtion:RATE ..................................................................................................................... 33
9.8COMParator Subsystem .................................................................................................................. 34
9.8.1COMParator:RMODe.............................................................................................................. 34
9.8.2COMParator:VMODe.............................................................................................................. 34
9.8.3COMParator:BEEP.................................................................................................................. 34
9.8.4COMParator:TOLerence:RNOMinal....................................................................................... 34
9.8.5COMParator:TOLerence:RLiMiT ........................................................................................... 35
9.8.6COMParator:TOLerence:VNOMinal ...................................................................................... 35
9.8.7COMParator:TOLerence:VLiMiT........................................................................................... 35
9.9TRIGger Subsystem......................................................................................................................... 35
9.9.1TRIGger[:IMMediate] ............................................................................................................. 35
9.9.2TRIGger:SOURce.................................................................................................................... 36
9.9.3TRG ......................................................................................................................................... 36
9.10FETCh Subsystem ........................................................................................................................... 36
9.10.1FETCh?.................................................................................................................................... 36
9.11CORRection Subsystem .................................................................................................................. 36
9.11.1CORRection:SHORt................................................................................................................ 36
9.12SYSTem subsystem ......................................................................................................................... 37
9.12.1SYSTem:SENDmode............................................................................................................... 37
9.13ERRor Subsystem............................................................................................................................ 37
9.14IDN? ................................................................................................................................................ 37
9.15SAV.................................................................................................................................................. 37
10.Specification ............................................................................................................................................ 38
10.1General Specifications ..................................................................................................................... 38
10.2About Accuracy ............................................................................................................................... 38
10.3AC Resistance Range ...................................................................................................................... 39
10.4DC Voltage Range ........................................................................................................................... 39
10.5Features............................................................................................................................................ 39
10.6Environment .................................................................................................................................... 39
10.7Dimensions ...................................................................................................................................... 40

5
Figure Contents
FigureContents
Figure 1-1 How to remove the handle ......................................................................................................... 8
Figure 3-1Front panel ................................................................................................................................11
Figure 3-2Rear Panel.................................................................................................................................11
Figure 3-3Connect to DUT....................................................................................................................... 12
Figure 7-1Pin Assignment ........................................................................................................................ 24
Figure 7-2Typical Circuit Diagram of Handler Interface Input signals.................................................... 25
Figure 7-3Typical Circuit Diagram of Handler Interface Output signals. ................................................ 25
Figure 8-1The RS-232 connector in the rear panel .................................................................................. 27
Figure 8-2USB-Serial Interface ATN2 ..................................................................................................... 28
Figure 9-1Command Tree Example ......................................................................................................... 30
Figure 9-2DISP Command Tree ............................................................................................................... 32
Figure 9-3FUNCtion Subsystem Tree ...................................................................................................... 33
Figure 9-4COMParator Subsystem Command Tree................................................................................. 34
Figure 9-5TRIGger Subsystem Command Tree ....................................................................................... 35
Figure 9-6FETCh Subsystem Command Tree.......................................................................................... 36
Figure 9-7CORRection Subsystem Command Tree................................................................................. 36
Figure 9-8SYSTem commad tree ............................................................................................................. 37
Figure 10-1Dimensions .............................................................................................................................. 40
TableContents
Table 3-1Front panel description .............................................................................................................11
Table 3-2Rear panel description ............................................................................................................. 12
Table 7-1Description of Handler Interface Signals................................................................................. 24
Table 8-1RS-232 connector pinout ......................................................................................................... 27
Table 9-1Multiplier Mnemonics ............................................................................................................. 32

6 AT526 User's Guide
1. UnpackingandPreparation
This chapter describes how to set up and start the AT526.
Incoming Inspection
Power Requirements
Setting up the Fuse
How to Remove the Handle
Environmental Requirements
Cleaning
1.1 IncomingInspection
After you receive the instrument, carry it out and check during unpacking according to
the following procedures.
WARN I NG
If the external face of the instrument (such as the cover, front/rear panel, LCD screen,
power switch, and port connectors) appears to have been damaged during transport, do
not turn on the power switch. Otherwise, you may get an electrical shock.
Make sure that the packing box or shock-absorbing material used to package the
instrument has not been damaged.
Referring to <Packing List> in the packing box, check that all packaged items supplied
with the meter have been provided as per the specified optioned.
NOTE
If an abnormality is detected, contact the company and transport the meter to your
nearest Applent Instruments sales or service office. For inspection by the transport
company, save the packing box, shock-absorbing material, and packaged items as you
received them.
1.2 PowerrequirementsandsettingupFuse
~Line: 220VAC, 50Hz/60Hz
Fuse: 250V 1A Slow Blow
Please use the following fuse type.
UL/CSA type, Slow-Blow, 5×20-mm miniature fuse, 1A, 250 V
When you need a fuse, contact your nearest Applent Instruments sales or service office.
To verify and replace the fuse, remove the power cable and pull out the fuse holder.
1.3 EnvironmentalRequirements
Set up the AT526 where the following environmental requirements are satisfied.
Operating Environments
Ensure that 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

7
Unpacking and Preparation
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
1.4 Cleaning
To prevent electrical shock, disconnect the AT526 power cable from the receptacle
before cleaning.
Use a dry cloth or a cloth slightly dipped in water to clean the casing.
Do not attempt to clean the AT526 internally.
WARNING: Don’t Use Organic Solvents (such as alcohol or gasoline) to clean the
Instrument.
1.5 HowtoRemovetheHandle
A handle kit is attached to the AT526:

8 AT526 User's Guide
Figure1‐1  Howtoremovethehandle
1 Retracted

3 Carrying Position

2 Extended
Remove Handle（Lift the handle perpendicular to the unit while pulling it in the direction of 1.）


9
Overview
2. Overview
This chapter contains general information about AT526 .The information is organized as
follows
Introduction
Main Specifications
Feature overview
2.1 Introduction
Thank you for choosing AT526 Battery Internal Resistance Meter.
AT526 adopts high-performance 32-bit ARM processor. It is a meter with wide
resistance measurement range from 0.001mΩto 33kΩand DC voltage range from
0.00000V to 120.0000V.
The instrument features an m-Ohm and V mode that allows simultaneous measurement
and comparison of battery internal resistance and open-circuit voltage. This meter is
highly suitable for battery inspection lines as one unit can act as both a low-resistance
meter and a voltmeter.
The AT526 completes with comparator function and external interface (handler)
utilizing the principles of the AC 4-terminal method that gives priority to line use and
offers high speed, high accuracy and high resolution.
With its built-in comparator, the AT526 can output comparison/decision results for
sorting components into resistance HIGH-IN-LOW bins and voltage HIGH-IN-LOW
bins.
AT526 measures all kinds of battery’s resistance and DC voltage, such as lithium
batteries, lead-acid batteries, Button Cell Batteries and etc. Especially, AT526 can
measures UPS battery while UPS working online.
AT526 is equipped with RS232 interface to apply to remote control, data acquisition and
analysis.
AT526 is also equipped with USB-Disk interface, and you can store the test values into
your USB Disk over 500 sets.
2.2 MainSpecificationsandFeatures
Basic Accuracy: Resistance: 0.2% Voltage: 0.01%
Test Frequency: 1kHz±2Hz
Max Display: Resistance: 33,000 digit, DC Voltage: 1,200,000 digit
7 ranges with Auto and Manual Modes
Four-terminal test method
Test Speed: 145 times/s (Ultra Speed Mode)
Trigger Mode: Internal, Manual, External and Remote trigger

10 AT526 User's Guide
2.3 MainFunctions
2.3.1 Correction
Short-circuit Clear Zero correction for all ranges.
2.3.2 Comparator(SortingFunction)
Set up sorting function to do GD/NG sorting.
Comparator Methods:
Absolute value of tolerance ±TOL sorting
Percentage tolerance TOL sorting
Sequence comparison sorting
Beep Feature:
Beep: OFF/GD/NG
2.3.3 SystemSetup
Keypad Lock Function
Switch Both in Chinese and English
Time and Date Settings
Administrator Accountant Settings
2.3.4 RemoteControl
Max baud rate: 115200bps,SCPI available, ASCII transmit.

11
Startup
3. Startup
This chapter describes names and functions of the front panel, rear panel, and screen
display and provides the basic procedures for operating AT526.
Front panel summary
Rear panel summary
Power On/Off
Connect to Device under Test
3.1 Frontpanel
Figure3‐1 Frontpanel
2
3
1
456
8
9
7
10
Table3‐1 Frontpaneldescription
No. Description
1 USB Disk Port (USB-Host)
2 Trigger Key
3 Power Switch
4 System Key (Include File, System and Key Lock)
5 Soft Key
6 Menu key
7 UNKNOWN Terminal
8 Entry Key
9 Cursor Key
10 LCD Display
3.2 RearPanel
Figure3‐2 RearPanel

12 AT526 User's Guide
HANLDER
RS-232C
TC
POWER
1
234

Table3‐2 Rearpaneldescription
No. Description
1 RS-232C Interface
2 Handler Interface
3 Temperature Compensation Interface
4 AC Power Cord Receptacle
3.3 PowerOn/Off
3.3.1 LinePowerConnection
Power ON. Power OFF.
3.4 Warm‐upTime
AT526 is ready to be used as soon as the power-up sequence has completed. However, to
achieve the accuracy rating, warm up the instrument for 30 minutes.
3.5 ConnecttoDeviceunderTest(DUT)
Figure3‐3 ConnecttoDUT
Warning:
No putting current source, voltage source directly access to test side. Energy storage device
access to testing after discharging.
Be sure to ensure the floating state for a battery circuit with voltage exceeds 130VDC

13
<Meas> Key
4. <Meas>Key
This section includes the following information:
MEAS DISPLAY page
VIEW DATA page
4.1 <MEASDISPLAY>Page
Press [Meas] key to enter <MEAS DISPLAY>Page.
The <MEAS DISPLAY> page includes following setup:
Trigger Mode [TRIGGER]
Measurement Range [RANGE]
Test Speed [SPEED]
Comparator [COMP] ON/OFF
[BEEP] Feature
Soft-key VIEW DATA – To Enter [VIEWDATA] page
Soft-key SAVE DATA – To Store measurement result into internal flash disk.
Figure4‐1<MEASDISPLAY>Page
(Ultra-Fast Speed Mode)
4.1.1 [TRIGGER]
SCPI Command: TRIGger:SOURce {INT,MAN,EXT,BUS}
SCPI Query Command: TRIGger:SOURce?
AT526 supports four trigger modes: INT (internal), EXT (external), MAN (manual) and

14 AT526 User's Guide
BUS (RS-232)
Table4‐1  TriggerSetting
Trigger Mode Description
INT Continuously repeats the measurement cycle.
MAN Performs one cycle of measurement each time you press the [Trig] key.
EXT Performs one cycle of measurement each time a rising pulse is input to
the handler external trigger input pin on the rear panel.
BUS Performs one cycle of measurement each time it receives a trigger
command sent via RS-232.
Procedure to setting the trigger:
Step 1 Press [Meas] key to enter <MEAS DISPLAY>Page
Step 2 Use cursor keys to select [TRIGGER] field
Step 3 INT Automatic Internal trigger
MAN Manual Trigger by pressing [Trig] key
EXT External Trigger Mode
BUS BUS Trigger by RS232 SCPI command
4.1.2 [RANGE]
SCPI Command: FUNCtion:RANGe {<range number>,min,max}
SCPI Command: FUNCtion:RANGe:MODE {AUTO,HOLD,NOMinal}
SCPI Query Command: FUNCtion:RANGe?
SCPI Query Command: FUNCtion:RANGe:MODE?
AT526 has three resistance range modes and two voltage range.
Resistance Ranges:
Auto range, Manual range and Nominal range
Table4‐2ResistanceRangeMode
Range Description Pros Cons
AUTO
Automatically
select the best range according
to impedance
Range is automatically set.
Very
convenient
Test speed
is slower
than
manual
ranging,
HOLD The instrument will always
uses the user-specified range
Highest
speed
Set the
range
previously
NOMINAL
Automatically
select the best range according
to nominal value.
Best mode
for
sorting.
Only
available
in sorting
mode

Table4‐3ResistanceMeasurementRangesofAT526
Range Range Name Measurement Range
7 30kΩ3.2kΩ～33k
6 3kΩ320Ω～3.3k
5 300Ω32Ω～330
4 30Ω3.2Ω～33
3 3Ω320m～3.3
2 300Ω320Ω~ 330mΩ
1 30m32m～330m

15
<Meas> Key
Procedure of setting the range:
Step 1 Press [Meas] key to enter measurement page
Step 2 Use the cursor key to select [RANGE]
Step 3 AUTO Auto range
HOLD Current range is hold
NOMINAL Select the range according to resistance
nominal value [RNom].
INCR+ Increase range
DECL- Decline range
Voltage Ranges:
Table4‐4VoltageMeasurementRangesofAT526
Range Range Name Measurement Range
1 120V 12.0V~120V
0 12V 0V~12.2V
The DC voltage measurement range cannot be selected. AT526 always uses automatic
range mode under SLOW, MED and FAST speed mode and use the maximum range
under ULTRA speed mode.
4.1.3 MeasurementSpeed[SPEED]
SCPI Command: FUNCtion:RATE {SLOW,MED,FAST,ULTRA}
SCPI Query Command: FUNCtion:RATE?
SLOW, MED, FAST and ULTRA speed mode can be selected for AT526.
SLOW mode will result in more stable and accurate measurement result.
The following speed is measured in range-hold mode and comparator is ON:
SLOW: 1 times/sec (1s)
MED: 10 times/sec (100ms)
FAST: 30 times/sec (33ms)
ULTRA: 146 times/sec (6.8ms)
Procedure to setting test speed:
Step 1 Press [Meas] key to enter measurement page;
Step 2 Use the cursor key to select [SPEED] field
Step 3 SLOW
MED
FAST
ULTRA Small font
4.1.4 [BEEP]Feature
SCPI Command: COMParator:BEEP {OFF,GD,NG}
SCPI Query Command: COMParator:BEEP
Procedure to setting the beep:
Step 1 Press [Meas] key to enter measurement page;
Step 2 Use the cursor key to select [BEEP]
Step 3 OFF Turn Beep Off
GD Beep while Pass
NG Beep while Fail
4.2 StatusBaron<MEASDISPLAY>
HOLD – Hold the data under internal trigger mode, test stops.
SYSTEM– Go to <SYSTEM CONFIG>Page
KEY LOCK – Lock the keypad.
Time

16 AT526 User's Guide
4.2.1 Iconson<MEASDISPLAY>
Table4‐5Icons
Icon Description
USB-Disk is available.
HHold current data.
4.2.2 [VIEWDATA]Soft‐key
To enter the <VIEW DATA> page by pressing [VIEW DATA] soft-key.
4.2.3 [SAVEDATA]Soft‐key
Every time press this key, a line of measurement result will be stored into internal flash
disk.
The saved data can be reviewed on <VIEW DATA> page by pressing [VIEW DATA]
soft-key.
4.3 <VIEWDATA>page
The measurement result can be stored in AT526’s internal nonvolatile memory by press
the [SAVE DATA] soft-key in <MEAS DISPLAY> page.
Over 500 sets data can be saved.
The format of measurement result is:
[Resistance][Voltage][Date][Time]
You can review the saved data on the <VIEW DATA> page by pressing the [VIEW
DATA] soft-key in <MEAS DISPLAY> page.
Figure4‐2  <VIEWDATA>page
SAVE TO DISK – Store all data into USB Disk
RESET – The data will be stored from the start of the table.
FORMAT – To format the internal nonvolatile memory disk, all data will be lost.
PAGE – Jump to the provided page

17
[SETUP] Key
5. [SETUP]Key
This chapter describes:
<STEUP> page
Short-circuit Clear Zero
5.1 <SETUP>page
Press [Setup] key to enter <SETUP>page.
In <SETUP> page, the Instrument does not display measurement result and comparator
result, testing is not in progress.
The <SETUP> page includes following setup:
Trigger Mode [TRIGGER]
Measurement Range [RANGE]
Measurement Speed [SPEED]
BEEP Feature
Soft-key CLEAR ZERO – Clear Zero Correction
R-COMP – AC Resistance Sorting Methods
V-COMP– DC Voltage Sorting Methods
R-NOMINAL – Input Resistance Nominal Value
R-LOWER – Input Resistance Lower Limit
R-UPPER – Input Resistance Upper Limit
V-NOMINAL – Input Voltage Nominal Value
V-LOWER – Input Voltage Lower Limit
V-UPPER – Input Voltage Upper Limit
Some settings can be also set up in <MEAS DISPLAY> page. Please refer to the chapter:
<Meas> Key
Figure5‐1<SETUP>page
5.2 Short‐circuitClearZero[CLEARZERO]
SCPI Command: CORR:SHOR
Press [Setup] key to enter < SETUP> page, and then press [CLEAR ZERO] soft-key to
perform short-circuit clear zero.

18 AT526 User's Guide
After correction, the value will be saved into internal flash disk.
It is necessary to do short-circuit clear zero correction.
When replace the test fixture or test cables, please do short –circle clear zero.
How to connect the test clips before executing short-circle clear.
Figure 5-2 Connect the test clip
5.3 ComparatorMode[R‐COMP],[V‐COMP]
SCPI Command: COMP:RMOD {OFF,ABS,PER,SEQ}
SCPI Command: COMP:VMOD {OFF,ABS,PER,SEQ}
There are several items for choosing:
SEQ – Sequential Mode
PER – Percentage Mode [PER = (Result – Nominal) / Nominal * 100%]
ABS – Absolute Mode [ABS = Result – Nominal]
Procedure to set comparator mode:
Step 1 Press [Setup] key to enter <SETUP> page
Step 2 Use cursor key to select [RESMODE]
Step 3 SEQ Sequential Mode:
Compare result with low and high limited
values.
PER󰅿% Percentage Mode:
(Result – nominal) / nominal × 100%
ABS󰅿Absolute Mode:
Result – Nominal
5.3.1 ComparatorNominal[R‐NOMINAL],[V‐NOMINAL]
SCPI Command: COMParator:TOLerence:RNOMinal <float>
SCPI Command: COMParator:TOLerence:VNOMinal <float>
When using the ABS and PER mode, the nominal value must be inputted.
The field is ignored when in SEQ mode.
The Nominal value must be positive.
Procedure to input nominal value:
Step 1 Press [Setup] key to enter <SETUP> page
Step 2 Use cursor key to select [R-NOMINAL] or
[V-NOMINAL] field.
Step 3 Input the nominal value by numeric keypad.
5.3.2 Limit[R‐LOWER][R‐UPPER][V‐LOWER],[V‐UPPER]
SCPI Command: COMParator:TOLerence:RLMT <lower>,<upper limit>
SCPI Command: COMParator:TOLerence:VLMT <lower>,<upper limit>

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[SETUP] Key
The high limited value should be greater than low nominal value.
When in SEQ Mode, please input the direct value of resistance or voltage.
When in ABSMode, please input the absolute value of resistance or voltage.
When in PER% Mode, please input the relative value of resistance or voltage in %.
Procedure to input high/low limited values:
Step 1 Press [Setup] key to enter < SETUP> page
Step 2 Use cursor keys to select :
[R-LOWER] [R-UPPER] or
[V-LOWER] [V-UPPER] field
Step 3 Please input the percentage value when in [PER %]
mode
Please input the Direct value when in ABSand SEQ
mode.

20 AT526 User's Guide
6. <SYSTEMCONFIG>page
This chapter describes:
SYSTEM CONFIG
SYSTEM INFORMATION
SYSTEM SERVICE
6.1 <SYSTEMCONFIG>page
Press [SYSTEM] bottom soft-key to enter <SYSTEM CONFIG> page.
LANGUAGE – Choose English or Chinese Language
DATE/TIME
ACCOUNT
BEEP Feature
BAUD – RS232/RS485 Communication Baud Rate.
RS-485 Address
SHAKE HAND – RS232/RS485 Shake Hand
RESULT SEND – Acquire the test result by FETCH? Command or auto send.
All settings in <SYSTEM CONFIG> will be saved into internal flash disk
automatically.
Figure6‐1<SYSTEMCONFIG>page
6.1.1 [LANGUAGE]
Procedure to change language:
Step 1 Press [Meas] or [Setup] key to enter main page
Step 2 Press bottom soft-key [SYSTEM] to enter <SYSTEM CONFIG>
Step 3 Use cursor keys to select [Language] field
Step 4 中文 [CHN] Chinese