Applent Instruments Anbai AT2511 User manual

User’s Guide
Rev.A2
FIRMWARE REVISIONS
This manual applies
directly to instruments
that have the firmware
Rev.A.x
AT2511/511C
DC Low Resistance Meter
~@
Applent Instruments Ltd.
Address: Dangnan Industrial Zone,
Changzhou, Jiangsu, China (PRC)
Post Code: 213014
Tel: [phone] /
89966337
Fax: [phone]
Sales Email: [email protected]
Tech Email: [email protected]
http://www.applent.com

2 AT2511/511C User’s Guide
Safety Summary
Warning Dangerous:
When you notice any of the unusual conditions listed below, immediately terminate operation and
disconnect the power cable.
Please Contact Applent Instruments Incorporation sales representative for repair of the instrument. If
you continue to operate without repairing the instrument, there is a potential fire or shock hazard for
the operator.
Instrument operates abnormally
Instrument emits abnormal noise, smell, smoke or a spark-like light during the operation.
Instrument generates high temperature or electrical shock during operation.
Power cable, plug, or receptacle on instrument is damaged.
Foreign substance or liquid has fallen into the instrument.
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
Circuits
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.
DO NOT
Service Or Adjust Alone
Do not attempt internal service or adjustment unless another person,
capable of rendering first aid and resuscitation, is present.
DO NOT
Substitute Parts Or
Modify Instrument
Because of the danger of introducing additional hazards, do not
install substitute parts or perform unauthorized modifications to
the instrument. Return the instrument to an Applent Inc Sales and
Service Office for service and repair to ensure that safety
features are maintained.

3
Unpacking and Inspection
CERTIFIACTION, LIMITED & LIMITATION OF UABILITY
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 years 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, Inc.
Changzhou,
Jiangsu,
The People’s Republic of China.
Rev.C0 May, 2014

4 AT2511/511C User’s Guide
Contents
Safety Summary ....................................................................................................................................................................................... 2
CERTIFIACTION, LIMITED & LIMITATION OF UABILITY .............................................................................................................. 3
Contents ...................................................................................................................................................................................................... 4
Figure Contents ........................................................................................................................................................................................ 5
Table Contents .......................................................................................................................................................................................... 5
1.Unpacking and Inspection...................................................................................................................................................................6
1.1Packing List .............................................................................................................................................................................. 6
1.2Power Supply Requirements ................................................................................................................................................... 6
1.3Setting up the Fuse ................................................................................................................................................................... 7
1.4Environmental Requirements .................................................................................................................................................. 7
1.5Cleaning .................................................................................................................................................................................... 7
2.Overview.............................................................................................................................................................................................8
2.1Introduction............................................................................................................................................................................... 8
2.2Models Introduction ................................................................................................................................................................. 8
2.3Main Specifications .................................................................................................................................................................. 8
2.4Features Overview.................................................................................................................................................................... 9
3.Start up ..............................................................................................................................................................................................10
3.1Front Panel .............................................................................................................................................................................. 10
3.1.1Front panel description ................................................................................................................................................. 10
3.1.2Keypad .......................................................................................................................................................................... 10
3.1.3Rear panel description .................................................................................................................................................. 11
3.2Power ON/OFF ....................................................................................................................................................................... 11
3.2.1Power up........................................................................................................................................................................ 11
3.2.2Warm-up time ............................................................................................................................................................... 11
3.3Connect to Device under Test ................................................................................................................................................ 11
3.3.1Connection of test side ................................................................................................................................................. 11
3.4Select Test Speed .................................................................................................................................................................... 12
3.5Select Range ........................................................................................................................................................................... 12
3.6Clear Zero ............................................................................................................................................................................... 13
3.7SETUP Menu（only available for AT2511） ...................................................................................................................... 14
3.7.1Turn on comparator ...................................................................................................................................................... 15
3.7.2Uper and lower limit Setup .......................................................................................................................................... 15
3.7.3Beep Setup .................................................................................................................................................................... 15
3.7.4How the comparator work............................................................................................................................................ 15
4.Specification......................................................................................................................................................................................16
4.1Technical Specifications ........................................................................................................................................................ 16
4.2General Specifications ........................................................................................................................................................... 16
4.3Dimension ............................................................................................................................................................................... 17

5
Unpacking and Inspection
Figure Contents
Figure 3-1 Front panel ................................................................................................................................................................................ 10
Figure 3-2 Rear panel ................................................................................................................................................................................. 11
Figure 3-3 Definition of test terminal pin .................................................................................................................................................. 11
Figure 3-4 Right way .................................................................................................................................................................................. 13
Figure 3-5 Wrong way ................................................................................................................................................................................ 14
Figure 3-6 Setup Menu ............................................................................................................................................................................... 14
Figure 4-1 dimension .................................................................................................................................................................................. 17
Table Contents
Table 1-1 Included Accessories .................................................................................................................................................................... 6
Table 3-1 Range no., reference Resistance and Range change process ................................................................................................... 13
Table 3-2 AT511C Range no., reference Resistance and Range change process .................................................................................... 13
Table 4-1 AT2511 specification table ..................................................................................................................................................... 16
Table 4-2 AT511C specification table ..................................................................................................................................................... 16

6 AT2511/511C User’s Guide
1. Unpacking and Inspection
Thank you for purchasing our product, please refer to this chapter before using the instrument.
This chapter describes how to set up and start the AT2511/511C DC Low Resistance Meter.
Packing List
Power Supply Requirements
Setting up the Fuse
Environmental Requirements
Cleaning
1.1 Packing List
After you receive the instrument, carry out checks during unpacking according to the
following procedures.
1. Check that the packing box or shock-absorbing material used to package the
instrument has not been damaged.
2. Referring to Table 1-1, check that all packaged items supplied with the meter have
been provided as per the specified optioned.
Before using the instrument, please:
Table 1-1 Included Accessories
NAME QTY REMARK
User’s Manual 1
AC Power Cord 1 220V/50Hz
Fuse 2 0.5A Slow-Blow
ATL503 Kelvin Test Leads 1
Test Report 1
Product & Warranty Certification 1
If there is damaged or shortage in accessories, please contact Applent Sales Department or retailer.
1.2 Power Supply Requirements
Confirm that the power supplied to the AT2511/511C meets the following
requirements:
Voltage：198-252V AC
Frequency：47.5-52.5Hz
Consumption：<15VA
To prevent electrical shock, please connect to GND.
If users change power cord, please make sure reliable connection of GND.

7
Unpacking and Inspection
1.3 Setting up the Fuse
A spare fuse is included with the accessories, the fuse is located on the instrument’s rear panel, please
refer to Rear Panel section in Chapter 3
Please use the following fuse type：
250V, 0.5A Slow-Blow

1.4 Environmental Requirements
Ensure that AT2511/511C is operatd under the following environment:
TemperatureRange:0C～55C，
Humidity Range: <95%RH at 40C
1.5 Cleaning
To prevent electrical shock, disconnect the AT2511/511C 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 AT2511/511C internally.
WARNIN G :
Don’t Use Organic Solvents (such as alcohol or gasoline) to
clean the Instrument.

8 AT2511/511C User’s Guide
2. Overview
This chapter provides the following information:
Introduction
Models Introduction
Main Specifications
Features Overview
2.1 Introduction
Thank you for purchasing AT2511/511C DC Low Resistance Meter.
AT2511 is a resistance meter with high-cost performance and small volume, it is the upgrade
version of AT511A,
AT2511 has wider measurement range compared with previous products: 0.0 ～
1mΩ200.0
，
kΩMax reading 5000 dgts. The fastest test speed is 10t/s and with stable reading. The
improved full-automatic range test circuit, full-electronic switch make the possibility of
completing switch from the highest range to the lowest range.
AT2511/511C adopts 0.8 inches highlight LED display, which makes the display clearer and
easier to operate.
AT2511’s built-in sorting function enable users to perform upper and lower limit comparison.
AT2511/511C adopts superior low current test feature, it is quite suitable for measuring
resistance that is sensitive for test current, such as platinum thermistor, cooper thermistor, PTC
ceramic thermistor, wire type DC resistance, DC resistance for current protective device, etc.
AT2511/511C is also suitable for testing various kinds of contact resistance, transformers,
inductors, motors, deflecting coiling resistance, welding contact conductor resistance, the metal
riveting resistance of vehicles, boats, airplanes, printed circuit lines and crack detection and so
on.
2.2 Models Introduction
Model Resistance Range Range NO. Comparator Accuracy
AT2511 0.01mΩ-200.0kΩ8 Ranges Available 0.2%
AT5 11C 0.1mΩ-50.00k

6 Ranges None 0.3%
2.3 Main Specifications
The AT2511/511C technical specifications, including the basic technical specifications of
the instrument and equipment testing allows. These specifications are in the instrument
factory can achieve.
Reference：Please refer to Chapter 4 for complete technical specifications.

9
Overview
Basic accuracy：0.2% (AT2511) 0.3% (AT511C)
Maximum display digits: 5000
8 ranges AUTO and Manual（AT2511）
Provide resistance range 0.01mΩ～200.0kΩ, full-electronic switch control, no
limitation for lifetime, complete switching range instantly.
Test speed：
Fast：10t/s Slow：3t/s
Enhanced Shock resistance protection
2.4 Features Overview
0.8 inches big characters and highlight LED display
Full-automatic measurement and provide manual range
Comparator function（AT2511）
Short-circuit zero adjust for each range

10 AT2511/511C User’s Guide
3. Start up
This chapter provides the following information:
Front Panel Summary
Rear Panel Summary
Power ON/OFF
Connect to Device under Test
3.1 Front Panel
3.1.1 Front panel description
Figure 3-1 Front panel
1 Display Window 0.8 inches LED display
measuring result
2 Function Indicator Range Number, Test Speed
and AUTO Range Indicator
3 Power Switch Down：ON; Up：OFF.
4 Function Key
5 Direction key
6 Tested Terminal
7 Comparison Indicator（AT511C NONE）
3.1.2 Keypad
AUTO Switch AUTO and Manual Range
When AUTO indicator is lit, it means range is AUTO.
SPEED Select test speed
SETUP Setup Menu for comparator SETUP（AT2 511 ）.

11
Start up
ClearPerformshort-circuit zero calibration.
3.1.3 Rear panel description
Figure 3-2 Rear panel
1 RS232C。
Reserved port, this version does not use.
2 Fuse Holder
250V，0.5A fuse
3 AC Power Cord Receptacle
198V~242VAC，45Hz~55Hz
3.2 Power ON/OFF
3.2.1 Power up
PowerON Power OFF
3.2.2 Warm-up time
AT2511/511C 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 15 minutes.
3.3 Connect to Device under Test
3.3.1 Connection of test side
Figure 3-3 Definition of test terminal pin

12 AT2511/511C User’s Guide
SENSE+ SENSE-
DRIVE+ DRIVE-
To make sure instrument’s accuracy, please use the “Kalvin Test Clip” that follows the
instrument to test.
No putting current source, voltage source directly access test side. Energy storage device
access to testing after discharging.
3.4 Select Test Speed
2 test speed is available for the instrument:
Slow：3 t/s
Fast：10 t/s
Press Speed key，switch speed, correspond indicator indicates current speed.
3.5 Select Range
Under status of AUTO range, the AUTO indicator is lit, and the range indicator indicates the current
range.
AT2511 will choose the fit range to measure according to the following table:

13
Start up
Table 3-1 Range no., reference Resistance and Range change process
NO. Reference
Resistance
1 50mΩ
50mΩ

500m

5

50

500

5k

200kΩ
49mΩ

490m

4.9

49

490

4.9k

49kΩ
2 500m
3 5
4 50
5 500
6 5k
7 50k
8 200kΩ
AT511C will choose the fit range to measure according to the following table:
Table 3-2 AT511C Range no., reference Resistance and Range change process
NO. Reference
Resistance
1 500m
500m

5

50

500

5k

490m

4.9

49

490

4.9k
2 5
3 50
4 500
5 5k
6 50k
Press AUTO key can switch AUTO Range/ Range Hold
Tip：
Use Manual Range can effectively improve test speed.
If instrument can’t choose suitable Range under status of AOTO Range, please perform clear
zero.
About clear zero operation, please refer to “clear zero” section.
3.6 Clear Zero
To achieve high accuracy measurement, clear zero in necessary.
1．Press Clear key the Clearing status and make the test clips short-circuit like the following way
before zeroing.
Figure 3-4 Right way

14 AT2511/511C User’s Guide
The following example is wrong！
Figure 3-5 Wrong way
2．Press ESC to retreat Clear, press Enter to begin clearing, the instrument will clear zero all ranges.
．
3 Data will be saved in the nonvolatile memory when zeroing is over.
Tip：
To reach instrument’s specified accuracy, after the meter is warmed up and before using, we
recommend users to perform Clear Zero.
When instrument is used with tremendous temperature change, performing clear zero is also
recommended.
When instrument is used with different environment, we recommend users to perform Clear
Zero.
3.7 SETUP Menu（only available for AT2511）
AT2511 built-in upper limit and lower limit comparator, comparator function is turned on by SETUP
menu, setup 、
upper limit low limit and start beep indication.
Press SETUP key to enter SETUP menu:
Figure 3-6 Setup Menu
SETUP
【Comp】
OFF 【OFF】
PASS, 【GD/NG sorting】
HILO 【HIGH/IN/LOW】
【Upper Limit】
【Lower Limit】
【Beep】
OFF 【OFF】
FAIL, 【NG Beep】
pass 【DG Beep】

15
Start up
3.7.1 Turn on comparator
There are 2 ways for comparator to compare:
1. GD/NG compare. Under this way, instrument has 2 status indication: if exceeding upper and
lower limit, it is regarded as NG; if within upper and lower limit, it is GD indication.
2. HI/LO compare. Under this way, instrument has 3 status indication: HIGH/IN/LOW
Steps of turning on comparator:
Step 1 Press SETUP key to enter SETUP page;
Step 2 Press Enter key to enter Comp page
Step 3 Use Up and Down key to choose
Item Function
OFF Comparator is turned off, beep and comparator indicator is turned off too.
PASS 2 comparator ways indicate indicate simultaneously.
HILO HIGH/IN/LOW compare mode. PASS/FAIL indicator will be turned off.
Step 4 Press Enter key to to save setting, and return to SETUP page.
Or press ESC key to cancel current setting and return to SETUP page.
3.7.2 Uper and lower limit Setup
If comparator SETUP is turned on, users need to set correct comparator upper and lower value.
Steps of setting up comparator upper and lower limit:
Step 1 Press SETUP key to enter SETUP page;
Step 2 Press UP/DOWN key to choose correspond upper or lower limit menu;
Step 3 Press Enter key to enter INPUT page.
Step 4 Use left and right key to locator data area, decimal point and entity unit. Use UP and DOWN key to
change numerical values, decimal place and unit value.
Step 5 Press Enter key to save setting and return to SETUP page.
Or press ESC key to cancel current setting and return to SETUP page.
3.7.3 Beep Setup
Instrument provides 2 types of beep: NG and GD beeps.
Steps of setting up beep:
Step 1 Press SETUP key to entern SETUP page;
Step 2 Press UP/DOWN key to choose Beep menu;
Step 3 Press Enter key to enter Comp menu;
Step 4 Use UP and DOWN key to choose
Item Function
OFF Beep is turned off.
FAIL NG beep
PASS GD beep
Step 5 Press Enter key to save setting and return to SETUP page.
Or press ESC key to cancel current setting and return to SETUP page.
3.7.4 How the comparator work
After comparator is turned on, current measurement value will be compared with upper value
and lower value.
Comparator work flow:
Lower value < Refer < Upper value PASS Display IN (PASS)
Refer Lowervalue LOWFAIL DisplayLO(FAIL)
Refer Uppervalue HIGHFAIL DisplayHI(FAIL)

16 AT2511/511C User’s Guide
4. Specification
This chapter provides the following information:
Technical Specifications
General Specifications
Dimension
4.1 Technical Specifications
The following data are measured under the following conditions：
Temperature：20℃±5℃
Humidity: 80% R.H.
Zero Correction: Zeroing before testing
Warm up：60 minutes and more
Calibration Time：6 months
Sample Speed：Slow: 3 times/sec
Test current accuracy: ％
10
Table 4-1 AT2511 specification table
Range Maxim
Display Value Resolution Accuracy Test Current
Open-circuit
terminal voltage
1 50mΩ50.0mΩ10

Ω0.2%+5 digits 100mA <0.7V
2 500mΩ500.0mΩ100

Ω0.2%+3 digits 100mA <0.7V
3 5Ω5.000Ω1mΩ0.2%+2 digits 100mA <3V
4 50Ω50.00Ω10mΩ0.2%+2 digits 10mA <3V
5 500Ω500.0Ω100mΩ0.2%+2 digits 1mA <3V
6 5kΩ5.000kΩ1Ω0.2%+2 digits 100A <3V
7 50kΩ50.00kΩ10Ω0.2%+3 digits 10A <3V
8 200kΩ200.0kΩ100Ω0.2%±5 digits 10A <3V
Table 4-2 AT511C specification table
Range Maxim
Display Value Resolution Accuracy Test
Current
Open-circuit
terminal voltage
1 500mΩ500.0mΩ100

Ω0.2%+3 digits 100mA <0.7V
2 5Ω5.000Ω1mΩ0.2%+2 digits 100mA <3V
3 50Ω50.00Ω10mΩ0.2%+2 digits 10mA <3V
4 500Ω500.0Ω100mΩ0.2%+2 digits 1mA <3V
5 5kΩ5.000kΩ1Ω0.2%+2 digits 100A <3V
6 50kΩ50.00kΩ10Ω0.2%+3 digits 10A <3V
4.2 General Specifications
Resistance Range：AT2511: 0.01m~ 200.0k

17
Specification
AT511C: 0.1mΩ~ 50.00kΩ
Resolution：AT2511：0.01m
AT511C：0.1mΩ
Maxim Display Value：5000
Range：Automatic and Manual
Test speed：Slow：3 t/s fast：10 t/s
Correction：Short-circuit clear zero for each range
Test Terminal：4 terminals
Power：198V ~ 252VAC 48.5Hz ~ 52.5Hz
Fuse：0.5A Slow-Blow
Consumption：≤15VA
Dimension：220mm×85mm×259mm
Weight：2kg Net
Environment：Index：T 15℃~35℃H <80% RH
Operating：T 10℃~40℃H 10~90% RH
Storage：T 0℃~50℃H 10~90% RH
Accessories：User’s manual, ATL503 Kalvin test leads, AC power cord, test report, warranty card,
backup fuse
4.3 Dimension
Figure 4-1 dimension
-AT2511/511C User’s Guide-
©2005-2014 Applent Instruments Ltd.