Applent Instruments AT682 User manual

AT682/683 Megohmmeter
User’s Manual
@® Instruments, Inc.
Address: Lanlin Dangnan Industrial Park,
Changzhou, Jiangsu, China (PRC)
Post Code: 213014
Telephone (Sales):
0086-0519-88805550 / 89966117/89966227
Fax：[phone]
Sales Email: [email protected]om
Tech Email: [email protected]
http://www.applent.com
©2005-2011 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.

AT682/683 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.

AT682/683 User’s Manual
4
AT682/683 Megohmmeter
User’s Manual
FIRMWARE REVISIONS
This manual applies directly to instruments that have the firmware Rev.I
English
@%
©2005-2009 Applent Instruments, Inc.

5
Manual Print History
The print history shown below lists the printing dates of all Revisions and Addenda
created for this manual. The Revision Level letter increases alphabetically as the manual
undergoes subsequent updates. Addenda, which are released between Revisions, contain
important change information that the user should incorporate immediately into the
manual. Addenda are numbered sequentially. When a new Revision is created, all
Addenda associated with the previous Revision of the manual are incorporated into the
new Revision of the manual. Each new Revision includes a revised copy of this print
history page.
Revision A January, 2005
Revision B January, 2008
Revision C November, 2009

AT682/683 User’s Manual
6
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

7
Contents
Safety Summary............................................................................................................................................. 2
Safety Summary............................................................................................................................................. 3
CERTIFICATION, LIMITED WARRANTY & LIMITATION OF LIABILITY.............................................. 6
Megohmmeter Safety................................................................................................................................... 9
1 Unpacking and Preparation.................................................................................................................. 10
1.1 Incoming Inspection.................................................................................................................... 10
1.2 Power Supply................................................................................................................................. 11
1.3 Setting up Fuse ............................................................................................................................. 11
1.4 How to Remove the Handle ...................................................................................................... 11
1.5 Environmental Requirements ................................................................................................... 12
1.6 Cleaning.......................................................................................................................................... 12
2Overview.................................................................................................................................................... 13
2.1 Introduction................................................................................................................................... 13
2.2 Main Specifications ...................................................................................................................... 13
2.3 Feature Overview......................................................................................................................... 14
3 Getting Started......................................................................................................................................... 15
3.1 Front Panel..................................................................................................................................... 15
3.1.1 Front Panel Summary............................................................................................................... 15
3.1.2 Keypad......................................................................................................................................... 16
3.1.3 VFD............................................................................................................................................... 18
3.2 Real Panel Summary .................................................................................................................... 19
3.3 Power-up ........................................................................................................................................ 20
3.4 Measurement configuration...................................................................................................... 21
3.4.1 Connection to Device under Test (DUT) ............................................................................. 21
3.4.2 Voltage........................................................................................................................................ 21
3.4.3 Range........................................................................................................................................... 21
3.4.4 Charge Timer ............................................................................................................................. 22
3.4.5 Sample Timer.............................................................................................................................. 22
3.4.6 Clear Zero Correction (Zeroing) ............................................................................................ 23
3.4.7 Adjust VFD Brightness ............................................................................................................ 23
3.5 Measurement Procedure ............................................................................................................ 23
3.5.1 Charge –Test - Discharge ....................................................................................................... 23
3.5.2 Changing the Parameter......................................................................................................... 24
3.5.3 Rate .............................................................................................................................................. 24
3.5.4 Display IR and Leakage at one time. .................................................................................... 25
3.5.4 Display Peak ............................................................................................................................... 25
3.5.5 Display Sorting Result.............................................................................................................. 25
3.5.6 Turning ON/OFF the Beep Feature...................................................................................... 25
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............................................................................................................. 29
6 Remote Control ........................................................................................................................................ 31
6.1 About RS-232C.............................................................................................................................. 31
6.2 Enable RS-232C Interface and select baud rate.................................................................... 32
6.3 SCPI Language .............................................................................................................................. 32
.7 Command Reference ............................................................................................................................ 33
7.1 Terminator ..................................................................................................................................... 33
7.2 Notation Conventions and Definitions................................................................................... 33
7.3 Command Structure..................................................................................................................... 33
7.4 Header and Parameters.............................................................................................................. 35
7.5 Command Reference................................................................................................................... 36

AT682/683 User’s Manual
8
7.6 Function Subsystem..................................................................................................................... 37
:RESistance.............................................................................................................................................. 37
:CURRent ................................................................................................................................................ 37
:RANGe................................................................................................................................................... 37
:RANGe:AUTO....................................................................................................................................... 38
7.7 VOLTage Subsystem.................................................................................................................... 38
7.8 CORRection Subsystem............................................................................................................... 39
7.9 COMParator Subsystem .............................................................................................................. 39
:RECord................................................................................................................................................... 40
:RESistance.............................................................................................................................................. 40
:CURRent ................................................................................................................................................ 40
:BEEP ...................................................................................................................................................... 40
:BEEP:SET.............................................................................................................................................. 41
7.10 STATe Subsystem ....................................................................................................................... 41
:CHARage ............................................................................................................................................... 42
:DISCharge.............................................................................................................................................. 42
7.11 TIMEr Subsystem ........................................................................................................................ 42
:CHARge................................................................................................................................................. 42
:SAMPle .................................................................................................................................................. 43
7.12 APERture Subsystem................................................................................................................. 43
7.13 SYSTem Subsystem .................................................................................................................... 43
:KEYLock................................................................................................................................................ 44
7.14 TRIGger Subsystem.................................................................................................................... 44
[:IMMediate]............................................................................................................................................ 44
:SOURce.................................................................................................................................................. 44
7.15 FETCh Subsystem....................................................................................................................... 45
FETCh?.................................................................................................................................................... 45
7.16 ERRor Subsystem........................................................................................................................ 45
ERRor? .................................................................................................................................................... 45
7.17 *IDN? Common Command ...................................................................................................... 46
7.18 *RST Common Command ........................................................................................................ 46
A Specifications ........................................................................................................................................... 47
AT682/683 Megohmmeter Specifications .................................................................................... 47
Dimensions ........................................................................................................................................... 50
B Error message........................................................................................................................................... 51

9
Megohmmeter Safety
WARNING :
The AT682/683 Megohmmeter can provide an output voltage as high as 1000VDC
to the external device under test (DUT).
Although the AT682/683 unit is designed with full attention to operator safety,
serious hazards could occur if the instrument is used improperly and these safety
instructions are not followed.
The AT682/683 is designed to be operated with its chassis connected to earth ground. The
instrument is shipped with a three-prong power cord to provide this connection to ground.
The power cord should only be plugged in to a receptacle that provides earth ground.
Serious injury can result if the Sentry unit is not connected to earth ground.
Tightly connect cable(s) to the (red) GND terminal. If this is not done, the DUT‟s casing
can be charged to the high voltage test level and serious injury or electrical shock hazards
could result if the DUT is touched.
NEVER touch the metal of the High Voltage probe directly. Touch only the insulated parts
of the lead(s).
NEVER touch the test leads,test fixture or DUT in any manner (this includes insulationon
all wires and clips) when the high voltage is applied and the red HV LED is lit.
Before turning on theAT682/683, make sure the AC power cord is plugged into the proper
voltage source and that there is no device (DUT) or fixture connected to the test leads.
After each test, press the [DISCH] button for safety. This terminates the high voltage being
applied to the output terminals.
When the HV LED is lit NEVER touch the device under test, the lead wires or the output
terminals.

AT682/683 User’s Manual
10
1 Unpacking and Preparation
This chapter describes how to set up and start the AT682/683 Megohmmeter.
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 out checks during unpacking according to the
following procedure.
WARNING
If the external face of the instrument (such as the cover, front/rear panel, VFD
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.
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.
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.
Table 1-1 Items Packaged with the meter
Name
Qty
remark
AT682/683 Megohmmeter
1
User‟s Manual
1
Power Cable
1
220V/50Hz
Fuse
2
250V, 1A Slow-blow
ATL507 Test Clip Leads
1
ATL801 RS232 Cable
1
Warranty certificate
1
Includes Product certification

1. Unpacking and Preparation
11
1.2 Power Supply
Confirm that the power supplied to the AT682/683 meets the following
requirements:
Voltage：198-252VAC
Frequency：47.5-52.5Hz
Power-consumption: 30VA max
1.3 Setting up Fuse
~Line: 47.5Hz-52.5Hz
198Vac - 242Vac
50VA MAX
Fuse: 250V 1A
Slow Blow
~Line: 47.5Hz-52.5Hz
198VAC–242VAC
30VA 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
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.
NOTE
Two fuses in Fuse Holder.
1.4 How to Remove the Handle
A handle kit is attached to the AT682/683.

AT682/683 User’s Manual
12
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
1.5 Environmental Requirements
Set up the AT682/683 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
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
1.6 Cleaning
To prevent electrical shock, disconnect the AT682/683 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 AT682/683 internally.
WARNING: Don‟t Use Organic Solvents (such as alcohol or gasoline) to clean the
Instrument.

2. Overview
13
2Overview
This chapter contains general information about the AT682/683 Megohmmeter .The
information is organized as follows
Introduction
Main Specifications
Feature overview
2.1 Introduction
Thank you for purchasing AT682/683 Megohmmeter.
The Applent AT682/683 is a Megohmmeter (Insulation Resistance Meter) for quality
control and laboratory use. AT682/683 is used for measuring insulation resistance of
electronic components, devices, dielectric materials, wires, cables and etc.
The AT682/683 Dual Display (insulation resistance and leakage current) Megohmmeter
includes 4-digit (9,999 counts), 6-range (auto and manual), broad measurement range
(10k~1T) and super fast test rate (55 readings per second). The voltage applied to the
device under test (DUT) is programmable from 1 to 1000 volts.
The AT682/683 can output comparison/decision results for sorting components into 2 bins.
Furthermore, by using the handler interface, the AT682/683 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
AT682/683 and enabled automatic testing.
2.2 Main Specifications

Full AT682/683 specifications are included in Appendix A.
Some main specifications of the AT682/683 include:
Measuring Insulation Resistance and Leakage Current。
Output Negative Voltage: 1.0VDC~1000VDC, Basic Accuracy：1%
<100V: 0.1V step 100V: 1V step
Basic Accuracy: <1G: 1%，1G: 3%，10G: 5%
Max Charge Current: 30mA 5mA
Automatic Test with 6 Ranges
AT682:Board Measurement Range from 10k  to 1T 
AT683:Board Measurement Range from 100k  to 10T 

AT682/683 User’s Manual
14
Super Fast Test Rate
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.
2.3 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.

3. Startup
15
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 the AT682/683.
Front Panel Summary
Real Panel Summary
Power-up
Begin Measuring
3.1 Front Panel
3.1.1 Front Panel Summary
Charge Rate
Range
Remote
Shift
View
I/R
Brightness
0.+/-
12 3
456
78 9
Trig
Esc Enter
p
nm
k

MG
Trigger
AT682 Megaohmmeter
Disch
Refer Voltage
Timer
1
2
3
5
6
7
Admin

!Applent
Beep
Beeper
Clear
UNKNOWN
(+) (-)
HV
Rx
!
4
Figure 3-1 Front Panel
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 section “3.1.3 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)

AT682/683 User’s Manual
16

Full Terminals Information refers to “Connection to DUT”
5. Keypad II (shifted or un-shifted)
Multi-function keys: Numeric, 1st Function and 2nd Function.
6. Shift Key
7. Keypad I (shifted or un-shifted)
Dual-Function keys: 1st Function and 2nd Function.

Full Keypad Descript in follow section “3.1.2 Keypad”
3.1.2 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
Shift
View
I/R
Disch
Figure 3-2 Keypad I
Range
Remote
Brightness
0.+/-
12 3
456
78 9
Trig
Esc Enter
p
nm
k

MG
Trigger
Refer Voltage
Timer
Admin
←
Beep
Beeper
Clear
Figure 3-3 Keypad II
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

3. Startup
17
Timer Preset Charge Timer and Sample Timer.
Range Auto or Manual measurement.
Logo AUTO on VFD reps. Range Automatic
<,> Choose Range 1~6。
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.
Available in the Manual Trigger mode.
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 Disabled
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.

NOTE:
Admin Functions: Password Protected.
For more technical support, please contact Applent Instruments.
Send An Email to Applent Technical Center: [e-mail]
Trigger Trigger Set。
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).

AT682/683 User’s Manual
18
3.1.3 VFD
Figure 3-4 VFD
! Applent‟s Trade Mark.
  Remote Interface (RS232) ON
Beep Enabled.
AUTO Auto ranging enabled.
NG Pass.
GD Fail.
EX External Trigger enabled.
TRIG Manual (Remote) Trigger enabled.
F M S Rate (Fast, Medium and Slow)
DELAY Timer Started.
Current Range Number or Record Number.
Shift Shifted to the 2nd Function.

3. Startup
19
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
1. Handler Interface
2. RS232C Interface
3. AC Inlet Module

AT682/683 User’s Manual
20
3.3 Power-up
3.3.1 Line Power Connection
Follow the procedure below to connect the AT682/683 to line power and turn on the
instrument.
1. Before plugging in the power cord, make sure that the front panel power switch
is in the off (0) position.
2. Connect the female end of the supplied power cord to the AC receptacle on the
rear panel. Connect the other end of the power cord to a grounded AC outlet.
WARNING :
The power cord supplied with the AT682/683 contains a separate ground wire for use
with grounded outlets. When proper connections are made, instrument chassis is
connected to power line ground through the ground wire in the power cord. Failure to
use a grounded outlet may result in personal injury or death due to electric shock..
Turn on the instrument by pressing the front panel power switch to the on (1)
position.
Power On
Power Off
3.3.2 Power-up Sequence
On power-up, AT682/683 performs self-tests on its FlashRom and 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.
3.3.3 Warm-up Time
AT682/683 is readyto be used as soon as the power-up sequence has completed. However,
to achieve the accuracy rating, warm up the instrument for 30 minutes.