Applent Instruments AT680 User manual

AT680 Leakage Current/IR Meter
User’s Manual
@® Instruments, Inc.
Address: 7BC, No.91, Guanhe(W) Rd,
Changzhou,
Jiangsu,
China (PRC)
Post Code: 213002
Telephone (Sales): 0086-0519-88805550 / 88050005 Ext 0
Telephone (Tech.): 0086-0519-88805550 / 88050005 Ext 8008
Fax：[phone]
http://www.applent.com
Sales Email: [email protected]
Tech Email: [email protected]
©2005~2009 Applent Instruments, Inc.
The material in this manual is for informational purposes only and is subject to change, without notice. Applent
assumes no responsibility for any error or for consequential damages that may result from the misinterpretation of
any procedures in this publication.
This document contains proprietary information which is protected by copyright.
All rights are reserved.
No part of this document may be photocopied, reproduced, or translated to another language without the prior
written consent of the Applent Instruments Inc.

AT680 Leakage Current/IR Meter user’s Manual
2
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.

Safety Summary
3
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
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.
WARNING & DANGEROUS
Dangerous voltage levels, capable of causing death, are present in this
instrument.
Use extreme caution when handling, testing, and adjusting this
instrument.

AT680 Leakage Current/IR Meter user’s Manual
4
AT6 80 Leakage Current/IR Meter
User’s Manual
English
@ Instruments,Inc.
©2005-2009 Applent Instruments, Inc.

CERTIFICATION, LIMITED WARRANTY & LIMITATION OF LIABILITY
5
CERTIFICATION, LIMITED WARRANTY & 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 2 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.A2 January, 2005
Rev.B0 January, 2008

AT680 Leakage Current/IR Meter user’s Manual
6
Contents
Safety Summary............................................................................................................................................. 2
Safety Summary............................................................................................................................................. 3
CERTIFICATION, LIMITED WARRANTY & LIMITATION OF LIABILITY.............................................. 5
1 Unpacking and Preparation.................................................................................................................... 8
1.1 Incoming Inspection...................................................................................................................... 8
1.2 Power Supply................................................................................................................................... 8
1.3 Setting up Fuse ............................................................................................................................... 9
1.4 Environmental Requirements ..................................................................................................... 9
1.5 Cleaning ........................................................................................................................................... 9
1.6 How to Remove the Handle ........................................................................................................ 9
2Overview.....................................................................................................................................................11
2.1 Introduction....................................................................................................................................11
2.2 Model Numbers Contrast ............................................................................................................11
2.3 Main Specifications .......................................................................................................................11
2.4 Feature overview ......................................................................................................................... 12
3 Getting Started......................................................................................................................................... 13
3.1 Front Panel..................................................................................................................................... 13
3.1.1 Front Panel Summary............................................................................................................... 13
3.1.3 Keypad......................................................................................................................................... 15
3.2 Real Panel Summary .................................................................................................................... 16
3.3 Power-up ........................................................................................................................................ 17
3.4 Measurement configuration...................................................................................................... 17
3.4.1 Connection to Device under Test (DUT) ............................................................................. 17
3.4.2 Voltage........................................................................................................................................ 18
3.4.3 Range........................................................................................................................................... 18
3.4.4 Charge Timer ............................................................................................................................. 19
3.4.5 Sample Timer.............................................................................................................................. 19
3.4.6 Clear Zero Correction (Zeroing) ............................................................................................ 20
3.4.7 Adjust VFD Brightness ............................................................................................................ 20
3.5 Measurement Procedure ............................................................................................................ 20
3.5.1 Charge – Test - Discharge ....................................................................................................... 20
3.5.2 Changing the Parameter......................................................................................................... 21
3.5.3 Rate .............................................................................................................................................. 21
3.5.4 Display IR and Leakage at one time. .................................................................................... 22
3.5.5 Display Peak ............................................................................................................................... 22
3.5.6 Sorting Result displays at 2nd line........................................................................................ 23
3.5.7 Turning ON/OFF the Beep Feature. .................................................................................... 23
3.5.8 Set Trigger（TriggerShift）....................................................................................................... 24
3.5.9 Remote ........................................................................................................................................ 24
4 Comparator ............................................................................................................................................... 26
4.1 Input Limit reference value........................................................................................................ 26
4.2 Set Beep Feature: ......................................................................................................................... 26
4.2.1 Turning on/off the beep：..................................................................................................... 26
4.2.2 Set Beep：................................................................................................................................... 26
4.2.3 How the comparator work..................................................................................................... 27
5 Handler Interface..................................................................................................................................... 28
5.1 Pin Assignment............................................................................................................................. 28
5.2 Electrical Characteristics............................................................................................................. 30
5.3 Timing Chart.................................................................................................................................. 31
6 Remote Control ........................................................................................................................................ 33
6.1 About RS-232C.............................................................................................................................. 33
6.2 Enable RS-232C Interface and select baud rate.................................................................... 34
6.3 SCPI Language .............................................................................................................................. 34
.7 Command Reference ............................................................................................................................ 35
7.1 Terminator ..................................................................................................................................... 35
7.2 Notation Conventions and Definitions................................................................................... 35

Contents
7
7.3 Command Structure..................................................................................................................... 35
7.4 Header and Parameters.............................................................................................................. 37
7.5 Command Reference................................................................................................................... 38
7.6 Function Subsystem..................................................................................................................... 39
:RESistance.............................................................................................................................................. 39
:CURRent ................................................................................................................................................ 39
:RANGe ................................................................................................................................................... 39
:RANGe:AUTO....................................................................................................................................... 40
7.7 VOLTage Subsystem.................................................................................................................... 40
7.8 CORRection Subsystem............................................................................................................... 41
7.9 COMParator Subsystem .............................................................................................................. 41
:RECord ................................................................................................................................................... 42
:RESistance.............................................................................................................................................. 42
:CURRent ................................................................................................................................................ 42
:BEEP ...................................................................................................................................................... 42
:BEEP:SET .............................................................................................................................................. 43
7.10 STATe Subsystem ....................................................................................................................... 43
:CHARge ................................................................................................................................................. 44
:DISCharge .............................................................................................................................................. 44
7.11 TIMEr Subsystem........................................................................................................................ 44
:CHARge ................................................................................................................................................. 44
:SAMPle .................................................................................................................................................. 45
7.12 APERture Subsystem................................................................................................................. 45
7.13 SYSTem Subsystem .................................................................................................................... 45
:KEYLock................................................................................................................................................ 46
7.14 TRIGger Subsystem.................................................................................................................... 46
[:IMMediate] ........................................................................................................................................... 46
:SOURce.................................................................................................................................................. 46
7.15 FETCh Subsystem....................................................................................................................... 47
FETCh?.................................................................................................................................................... 47
7.16 ERRor Subsystem ....................................................................................................................... 47
ERRor? .................................................................................................................................................... 47
7.17 *IDN? Common Command...................................................................................................... 48
7.18 *RST Common Command ........................................................................................................ 48
A Specifications ........................................................................................................................................... 49
AT680 Leakage Current/IR Meter Specifications ........................................................................ 49
Dimensions ........................................................................................................................................... 51

AT680 Leakage Current/IR Meter user’s Manual
8
1 Unpacking and Preparation
This chapter describes how to set up and start the AT680 Leakage Current/IR Meter
Incoming Inspection
Power Requirements
Setting up the Fuse
Environmental Requirements
Cleaning
How to Remove the Handle
1.1 Incoming Inspection
After you receive the instrument, carry out checks during unpacking according to the
following procedure.
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.
Table 1-1 Items Packaged with the meter
Name Qty Remark
User’s Manual 1
Power Cable 1 220V/50Hz
Fuse 2 250V, 1A Slow-blow
ATL680 Test Clip Leads 1
Warranty certificate 1 Includes Product
certification
1.2 Power Supply
Confirm that the power supplied to the AT680 meets the following requirements:
Voltage
：100-120VAC
Frequency
：47.5-52.5Hz
Power-consumption:50VAmax
WAR NI NG：The ground wire should be earthed to avoid being electric shock.
If you change the power cord, make sure the ground wire earthed.

Unpacking and Preparation
9
9
1.3 Setting up Fuse
~Line: 47.5Hz-52.5Hz
198Vac - 242Vac
50VA MAX
Fuse: 250V 1A
Slow Blow
Figure 1-1 Fuse Holder
Please use the following fuse type：
UL/CSA type, Slow-Blow, 5×20-mm miniature fuse, 1A, 250 V .

1.4 Environmental Requirements
Ensure that the operating environment meets the following requirements.
Temperature:0C to 55C
Operating stated accuracy：<80%RH
Temperature range at calibration: 23C±5C
Stated accuracy：<70%RH
1.5 Cleaning
To prevent electrical shock, disconnect the AT680 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 AT680 internally.
WARNING: Don’t Use Organic Solvents (such as alcohol or gasoline) to clean the
Instrument.
1.6 How to Remove the Handle
A handle kit is attached to the AT680.

AT680 Leakage Current/IR Meter user’s Manual
10
1 Retracted

Carrying Position

2 Extended
（
Remove Handle Lift the handle perpendicular to the unit while pulling it in the direction of ①.）
Figure 1-2 Handle

Overview
11
2Overview
The information is organized as follows
Introduction
Main Specifications
Feature overview
2.1 Introduction
Thank you for purchasing AT680 Leakage Current/IR Meter.
The Applent AT680 is a Leakage Current and Insulation Resistance Meter for quality
control and laboratory use. AT680 is used for measuring insulation resistance and leakage
current of electronic components, devices, dielectric materials, wires, cables and etc.
The AT680 Dual Display (insulation resistance and leakage current) Megohmmeter
includes 4-digit (9,999 counts), 7-range (auto and manual), broad measurement range
(1nA~20mA) and super fast test rate (55 readings per second). The voltage applied to the
device under test (DUT) is programmable from 1 to 650 volts.
The AT680 can output comparison/decision results for sorting components into 2 bins.
Furthermore, by using the handler interface, the AT680 can be easily combined with a
component handler and a system controller to fully automate component testing, sorting, and
quality-control data processing.A GD/NG indicator on VFD provides a visual display of test
results based on a preset limit. Thirty sets of test conditions are stored in the unit and can be
reprogrammed by the user.
The RS232C (used SCPI) and Handler interfaces are standard interfaces on the AT680
and enabled automatic testing.
2.2 Model Numbers Contrast
Model Measurement
range Rate Basic
Accuracy
Standard：AT680 1nA-20mA 55times/s 1%
Reduced：AT680SE 10nA-20mA 3 times/s 2%
2.3 Main Specifications
Some main specifications of the AT680 include:
Full 680 specifications are included in Appendix A.
Measuring Insulation Resistance and Leakage Current.
Output Negative Voltage: 1.0VDC~650VDC, Basic A ：
ccuracy 0.5%
<100V: 0.1V step，100V: 1V step。
Leakage Current Measurement Range：1nA-20mA
Leakage Current Basic Accuracy：1%
Insulation Resistance Measurement Range：1k-325G

AT680 Leakage Current/IR Meter user’s Manual
12
Insulation Resistance Basic Accuracy: <10G:3%，10G: 5%，100G: 10%
Max Charge Current: 200mA 20mA
Automatic Test with 7 Ranges and Manual
Test Rate
Slow: 3 readings/second with 9,999 counts
Medium: 25 readings/second with 1,999 counts
Fast: 55 readings/second with 1,999 counts
Built-in 2 timers
Charge Timer: 0s~999.9s
Sample Timer: 0s~999.9s
Trigger mode:
Internal Trig, Manual (Remote) Trig and External (Handler) Trig.
2.4 Feature overview
High brightness VFD
window size: 98mm×58mm
Correction (Zeroing) Function
Zero out test lead and fixture measurement errors.
Built-in Comparator (Sorting)
Thirty sets of Record can be used to store user’s data. Display on VFD Screen and/or
Output to Handler.
Beep and VFD Brightness can be Adjusted
Setup GD or NG Beep and adjust VFD Brightness.
Interfaces
1. Handler interface: GD/NG Output, Trig Signal Input and EOC (Busy) Output.
2. RS232C interface: SCPI Compatibility, ASCII Transmission.

Getting Started
13
3 Getting Started
This chapter describes names and functions of the front panel, rear panel, and screen
display and provides the basic procedures for operating AT680.
Front Panel Summary
Real Panel Summary
Power-up
Begin Measuring
3.1 Front Panel
3.1.1 Front Panel Summary
Charge Rate
Range
Remote
ShiftView
I/R
Brightness
0.+/-
123
456
789
Trig
Esc Enter
p
nm
k

MG
Trigger
Disch
Refer Voltage
Timer
1
2
3
5
6
7
Admin
←
Beep
Beeper
Clear
UNKNOWN
(+) (-)
HV
Rx
!
4
Figure 3-1 Front Panel
NO. Function
1 Power Switch
To apply power to the instrument, Push Down: ON, Push Up: OFF
2
Display
VFD Screen, Displays measurement results, instrument status and user’s interface menus.
Full VFD Content Includes in figure “3-2 VFD”.
3 Knob To Choose Menu Item and Input Number
4
Terminals
+ BNC (Red) (Sense)
- High Negative Voltage Output (Black) (Drive)
GND Ground (Red) (Ground Terminal for jumper of (+) Input Terminal or Guard Input to
Chassis GND)
GND earthing grip（If the measured piece is cable and capacitor, it doesn’t have to be linked to
，
earth others should be screened.）
Full Terminals Information refers to “Connection to DUT”

AT680 Leakage Current/IR Meter user’s Manual
14
5
Keypad II (shifted or un-shifted)
Multi-function keys: Numeric, 1st Function and 2nd Function.
Full Keypad Descript in follow section “3.1.3 Keypad”
6 Keypad I (shifted or un-shifted)
Dual-Function keys: 1st Function and 2nd Function.
Figure 3-2 Displayer
NO. Icon Function
(1) Digit Bit x8 1st line displays “Dish” in the discharge state or display the measurement Results in the
charge state.
(2) Digit Bit x8 2nd line displays sort results in the discharge state and displays the sorting results and
second parameters in the charge state.
(3) Digit Bit x8 3rd line displays the output voltage.
(4) EX TRIG
TRIG: Manual (Remote) Trigger enabled.
：
EX TRIG External Trigger enabled.
Full Trigger Descript in follow section “3.5.8 Set Trigger”
(5) FMS Rate (Fast, Medium and Slow) Full Rate Descript in follow section “3.5.3 Rate”
(6)
(8)
Current Range Number or Record Number.
(7) Shift Shifted to the 2nd Function.
(9) DELAY Timer Started.
(10) NG GD ： NG Fail.，： GD Pass.
(11) AUTO Auto ranging enabled. Full Auto Descript in follow section “3.4.3 Range”
(12)

Beep Enabled. Full Beep Descript in follow section “3.5.7 Turn on/off the Beep feature”.
(13) Remote Interface (RS232) ON.Full Remote Descript in follow section “3.5.9 Remote”

Getting Started
15
3.1.3 Keypad
ASSUMER：
On the Instrument Panel:
Black Words on Button represents 1st Function；
Orange Words on Panel represents 2nd Function;
Blue Words on Button represents Numeric Key.
Charge Rate
View
I/R
Disch
Figure 3-3 Keypad I
Range
Remote
Brightness
0.+/-
123
456
789
Trig
Esc Enter
p
nm
k

MG
Trigger
Refer Voltage
Timer
Admin
←
Beep
Beeper
Clear
Figure 3-4 Keypad II
1. 1st Function Keys (Un-shifted)
 
ASSUMER：Black Words on Button represents 1st Function；
Following functions can be chosen while the Shift mark on VFD is off.

ChargeCharge/Measure Initiate the Measurement
Disch Discharge the energy components (such as capacitances) to stop the measurement
(terminate high voltage at the negative output terminals).
Rate Measurement rate: 3 items could be chosen:
Slow, Medium, Fast
Param Select the Parameter: IR or Current
Clear Open Correction
Refer Limit Reference Values
Voltage Input the output Voltage values
Timer Preset Charge Timer and Sample Timer.
Range Auto or Manual measurement.
Logo AUTO on VFD reps. Range Automatic
Choose Range 1~7。
Esc To exit menu mode with no parameter changes made and backspace one
number. Available only in the Menu windows.
Enter To switch user to entry mode and accept menu entry as entered.
Available in the Menu windows.
Trig Triggers a measurement from the front panel.

AT680 Leakage Current/IR Meter user’s Manual
16
Available in the Manual Trigger mode.
2. 2nd Functions (Shifted)
 
ASSUMER：On the Instrument Panel:
Orange Words on Panel represents 2nd Function;
Following functions can be chosen while the Shift mark on VFD is on.

View 
The second line displays sorting results, second parameters (Resistance value and
current value), maximum and minimum.
A parameter’s change each time that the key is pressed.
Brightness Adjust VFD Brightness
n,,m,k,M,G Unit Available in Input box.
Beeper To setup the beep feature.
Remote Open/Close RS232 Interface.
Admin Only administrators can operate.
Trigger Setting Trigger.
3. Numeric Keys
ASSUMER：
On the Instrument Panel:
Blue Words on Button represents Numeric Key.
The numeric keys include Blue word keys, ESC key、Enter key and units (p, n, ,m,
k, M, G).
3.2 Real Panel Summary
~Line: 47.5Hz-52.5Hz
198Vac - 242Vac
50VA MAX
Fuse: 250V 1A
Slow Blow
123
Figure 3-5 Real Panel

Getting Started
17
1. Handler Interface
2. RS232C Interface
3. AC Inlet Module
3.3 Power-up
3.3.1 Line Power Connection
Power On
Power Off
3.3.2 Power-up Sequence
On power-up, AT680 performs self-tests on its FlashRom, RAM and momentarily lights
all segments and annunciators. If a failure is detected, the instrument will not enter the
measurement state.
3.3.3 Power-up Defaults
The power-on default will be the last configuration you saved.
3.3.4 Warm-up Time
AT680 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.
3.4 Measurement configuration
3.4.1 Connection to Device under Test (DUT)
Figure 3-6 Connection to DUT

AT680 Leakage Current/IR Meter user’s Manual
18
1．The negative terminal output high voltage, the piece should be linked in the
discharge state to avoid being electric shock.
2. Warning：Such as capacitor which has nonpolarity should be linked in the correct
way , or it is dangerous for the human being.
3．Recommend：Device discharges build in the machine.
．
4 Ensure that the operating environment meets the requirements.
3.4.2 Voltage
Voltage Input box accepts entry of a test voltage between 1.0 and 650 VDC.
<100V in 0.1V intervals, 100V in 1V intervals.
Discharge State
1. Press Voltage key, a cursor flashed at 3rd line on the
VFD.
2. Press Numeric Key Enter value.
．
3 Press Enter to finish input, the Value will save in
Flashrom and back to Discharge State.
Press Esc key to cancel input and back to Discharge
State.
3.4.3 Range
In the auto range state，AT680 choose the right range as illustrated in table 3-1.
Table 3-1 Range changes process
NO. lifting range Lower range
1 
2mA

200A

20A

2A

200nA

20nA


1.8mA

180A

18A

1.8A

180nA

18nA

2
3
4
5
6
7
If you don’t choose the fit range, you wouldn’t get the result in the standard accuracy.
If you don’t know the measured range ,you use the auto range to meansure.Press the

Getting Started
19
Range key to light the AUTO mark.
If you set-up the refer value , you can measure in the manual range, Press the Rangekey
to die out the AUTO mark, the AT680 would choose the range by the refer value.
Press Range < > key to set-up Manual range.
TIP：
Manual range is help increasing the test rate.
In the auto range state, some device (such as CBB) won’t be chosen the correct
range; you can use the manual range.
When you measure the leak current, the manual range is a better choice.
When you measure in the Fast/Med, the manual range is a better choice.
3.4.4 Charge Timer
Accepts entry of a charge time between 0 and 999.9 seconds in 0.1 second.
CHARG:
10.00
．
1 Under discharge state, press Timer key into timer
window. Rotate knob to choose“CHARG”item
and enter setup window.
．
2 Press Numeric Keys to Enter time value.
3. Enter key can be pressed to finish the input.
．
4 Press Esc to save time value or Press Enter key to
exit setup window.
NOTE：If charge time value set to 0s, the charge timer will be disabled.
3.4.5 Sample Timer
Accept entry of a sample time between 0 and 999.9 seconds in 0.1 second. In the
measurement state, AT680 will sample a data every sample time.
SAMPLE
1.500
．
1 Under discharge state, press Timer key into timer
window. Rotate knob to choose“SAMPLE”item
and enter setup window.
．
2 Press Numeric Keys to enter time value.
．
3 Enter key can be pressed to finish the input.
．
4 Press Esc to save time value or Press Enter key to
exit setup window.
TIP：
If sample time value set to 0s, the sample timer will be disabled，1s step, the
maxiumvalue is 999.9s.
You can setup the sample timer in the discharge state.
The sample timer is enabled in the external trigger state.
If sample time value set to 0s, charge timer is disabled.

AT680 Leakage Current/IR Meter user’s Manual
20
Flow：
In the external trigger state, the machine get the trigger signal,ouput the high voltage
and timer is on ,the machine sample each time and the output is off that the timer is to
0.In the same time, the handler interface output the sorting result (EOC,GD/NG) until
get another trigger signal.
3.4.6 Clear Zero Correction (Zeroing)
Before making measurements, AT680 should be zeroed to correct for test lead or
fixture errors.
．
1 Press Clear key to enter clear window. Before zeroing, remove all components
from test fixture.
NOTE:
The (+) test lead must be opened and suspended. NO touching any objects (such as
table).
．
2 Press Enter to clear zero.
During the zeroing process corrections are calculated and stored in AT680 flashrom
and applied to ongoing measurements.
．
3 Press Esc to terminate clearing process and exit zeroing window.
3.4.7 Adjust VFD Brightness
Press Shift Brightness key to adjust VFD Brightness.
The first line of VFD displays “VFD-LT” and the 2nd line shows current brightness
level. Press <, > or turn the Knob to change a new level.
Press Enter to save and exit to discharge state. Press Esc to exit to discharge state but
not save.
Brightness includes 8 levels:
0(dark)~7(bright)
3.5 Measurement Procedure
3.5.1 Charge – Test - Discharge
Figure 3-9 Three States
Charge StateDischarge State Test State