Sourcetronic ST2683A User manual

SOURCETRONIC −Qualitäts-Elektronik für Service, Labor und Produktion
Insulation resistance meter ST2683A
Manual

ST2683A Operation Manual Ver.1.3
Contents
Contents
1) Introduction to Instrument, Unpacking and Installing.......................................................1
1.1 Introduction to Instrument................................................................................. 1
1.2 Unpacking........................................................................................................... 1
1.3 Power Connection .............................................................................................. 1
1.4 Fuse..................................................................................................................... 2
1.5 Environment ....................................................................................................... 2
1.6 Use of Test Fixture.............................................................................................. 2
1.7 Warm-up............................................................................................................. 2
1.8 Other Features.................................................................................................... 2
2) Introduction to Front and Rear Panels...............................................................................3
2.1 Introduction to Front Panel................................................................................ 3
2.2 Introduction to Rear Panel ................................................................................. 4
2.3 Display Zone ....................................................................................................... 5
2.4 Introduction to Buttons on Front Panel ............................................................. 6
2.4.1 [MEAS] ................................................................................................................ 6
2.4.2 [SYSTEM]............................................................................................................. 6
2.5 Simple Operation................................................................................................ 6
2.6 Starting Up.......................................................................................................... 7
3) Basic Operation ..................................................................................................................8
3.1 <MEAS DISP> ...................................................................................................... 8
3.1.1 Measurement Functions..................................................................................... 9
3.2 <MEAS SETUP> ................................................................................................. 10
3.2.1 OUTP VOLT ....................................................................................................... 10
3.2.2 MEAS MODE ..................................................................................................... 11
3.2.3 CHAR TIME........................................................................................................ 11
3.2.4 MEAS SPEED ..................................................................................................... 12
3.2.5 RANGE SET........................................................................................................ 12
3.2.6 LOCK RANGE ..................................................................................................... 12
3.2.7 CONT CHEC ....................................................................................................... 13

ST2683A Operation Manual Ver.1.3
Contents
3.2.8 OPEN CLR.......................................................................................................... 13
3.2.9 Average............................................................................................................. 14
3.2.10 MEAS DISP ........................................................................................................ 15
3.3 <PICKOUT SETUP> ............................................................................................ 15
3.3.1 PICK FUNC......................................................................................................... 15
3.3.2 PICK ITEM.......................................................................................................... 16
3.3.3 LOLI ONE........................................................................................................... 16
3.3.4 BEEP SET ........................................................................................................... 16
3.3.5 Steps for BIN Disp............................................................................................. 17
3.3.6 Steps for PICK LIVA ........................................................................................... 17
3.3.7 Steps for OUTP RESU........................................................................................ 18
3.3.8 PULSE WID ........................................................................................................ 18
3.4 Start Test........................................................................................................... 18
3.4.1 Test Method ..................................................................................................... 18
3.4.2 Operation Process ............................................................................................ 20
3.4.3 Range Selection ................................................................................................ 20
4) System Setup and File Manage ....................................................................................... 21
4.1 System Setup .................................................................................................... 21
4.1.1 BEEPER.............................................................................................................. 21
4.1.2 PASSWORD ....................................................................................................... 21
4.1.3 BUS MODE ........................................................................................................ 22
4.1.4 LANGUAGE........................................................................................................ 22
4.1.5 KEYSOUND........................................................................................................ 23
4.1.6 TRIGGER............................................................................................................ 23
4.1.7 BAUD RATE ....................................................................................................... 23
4.1.8 HANDLER VCC................................................................................................... 24
4.1.9 Setting Time and Date ...................................................................................... 24
4.2 <File Manage> .................................................................................................. 25
4.2.1 Introduction to Save/Recall.............................................................................. 25
4.2.2 Structure of File Folder/File in a U Disk............................................................ 25

ST2683A Operation Manual Ver.1.3
Contents
5) Performance Index .......................................................................................................... 29
5.1 Measurement Function .................................................................................... 29
5.1.1 Measurement Parameters and Notations........................................................ 29
5.1.2 Range................................................................................................................ 29
5.1.3 Trigger............................................................................................................... 29
5.1.4 Mode of Test Terminal ..................................................................................... 29
5.1.5 Measurement Speed (when MEAS DISP & BIN DISP is set as OFF).................. 29
5.1.6 Display Digits .................................................................................................... 30
5.2 Test Signal......................................................................................................... 30
5.2.1 Output Voltage Range ...................................................................................... 30
5.2.2 Output Voltage Accuracy.................................................................................. 30
5.2.3 Maximum Display Range .................................................................................. 30
5.3 Measurement Accuracy.................................................................................... 31
5.3.1 Basic Accuracy for Resistance Measurement................................................... 31
6) Remote Control ............................................................................................................... 32
6.1 RS232C Connection .......................................................................................... 32
6.2 SCPI (Standard Commands for Programmable Instruments)........................... 33
6.3 USBTMC Remote Control System..................................................................... 33
6.3.1 System Configuration ....................................................................................... 33
6.3.2 Install the Driver ............................................................................................... 33
6.4 USBVCOM Virtual Serial Port............................................................................ 35
6.4.1 System Configuration ....................................................................................... 35
6.4.2 Installing Driver................................................................................................. 35
7) SCPI Command Reference............................................................................................... 36
7.1 Data Conventions of This Manual: ................................................................... 36
7.2 ST2683A Subsystem Commands ...................................................................... 36
7.2.1 DISPlay Subsystem Commands......................................................................... 36
7.2.2 FUNCtion Subsystem Commands..................................................................... 37
7.2.3 DISCharge Subsystem Commands.................................................................... 42
7.2.4 TRIGger Subsystem Commands........................................................................ 42

ST2683A Operation Manual Ver.1.3
Contents
7.2.5 FETCH? Subsystem Commands ........................................................................ 43
7.2.6 COMParator Subsystem Commands ................................................................ 44
7.2.7 SYSTem Subsystem Commands........................................................................ 47
7.2.8 Mass MEMory Subsystem Commands ............................................................. 48
7.3 GPIB Common Comamnds ............................................................................... 49
8) Handler Interface ............................................................................................................ 50
9) Package Contents and Warranty..................................................................................... 53
9.1 Package Contents ............................................................................................. 53
9.2 Marks................................................................................................................ 53
9.3 Package............................................................................................................. 53
9.4 Shipping ............................................................................................................ 54
9.5 Storage.............................................................................................................. 54
9.6 Warranty........................................................................................................... 54
Declaration
The descriptions contained in this manual may not cover all information about this instrument.
Introductions to the improvements of the instrument in performance, function, internal structure,
outer appearance, accessories, packing material, etc. are subject to change without notice. If you
find any inconformity of this manual with our instruments, please contact us for further
consultation by the address listed on the cover.

ST2683A Operation Manual Ver.1.3
1
1)Introduction to Instrument, Unpacking and
Installing
Thank you for your purchase and use of our products! This chapter will introduce the basic
instrument performance, which is followed by notes of unpacking and installing.
1.1 Introduction to Instrument
With touch, color LCD screen and unique insulation resistance/leakage current dual test function,
ST2683A Insulation Resistance Meter is an intelligent measurement instrument that is used for
rapid measurements on insulating properties of electronic parts and components (especially the
capacitance), dielectric material, equipment, wires, cables, etc.
ST2683A is provided with sorting output and external single pulse signal input interface, making it
easy for pipeline operation. The equipped communication interface can achieve the remote
operations of all functions of the instrument through a microcomputer. The instrument has a
powerful anti-jamming capability, which makes the measurement more reliable
1.2 Unpacking
Inspect the shipping container for damage after unpacking it. It is not recommended to power on
the instrument in the case of a damage container.
If the contents in the container do not conform to the packing list, notify us or your dealer.
1.3 Power Connection
1) Power supply: 90V to 121Vac (60Hz) or 198 to 242Vac (50Hz).
2) Power supply power range: ≤50VA.
3) L (line wire), N (neutral wire) and E (earth ground wire) of the power supply input socket
should correspond to the power plug of the instrument.
4) The instrument has been specially designed for decreasing noise jamming caused by the input
in AC power terminal, but it is also recommended to use it in the environment of low noise. If
noises cannot be avoided, install a power source filter please.
WARNING: To avoid injury to personnel and damage to the instrument resulting from electric
shock, do sure that the earth ground wire is safely grounded.

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1.4 Fuse
The fuse is a standard configuration, so use the included custom fuse please.
1.5 Environment
1) Do not store or use the instrument where it could be exposed to many dusts, great vibration,
direct sunshine and corrosive gas.
2) The instrument should operate under the temperature ranging from 10℃to 40℃, relative
humidity of no greater than 90%. For high accuracy, use the instrument in the environment
above mentioned.
3) For high accuracy, do not block the left air vent so as to ensure good ventilation.
4) The instrument has been specially designed for decreasing noise jamming caused by the AC
power input, but it is also recommended to use it in the environment of low noise. If noise
cannot be avoided, install a power filter please.
5) If the instrument will not be used for a long time, please place it in the original or a similar
packing box. The environment temperature should be kept in the range of 0℃to 40℃, and
the relative humidity should not be greater than 90%RH. The box should be located in an airy
room where it could be exposed corrosive impurities and direct sunlight.
6) Test leads on the instrument that are connected to DUTs should be kept away from strong
electromagnetic fields to avoid interference.
1.6 Use of Test Fixture
Only use the test fixture or cable made by our company, because the use of other test fixtures or
cables may result in incorrect measurement results. In addition, for good contact of DUT and fixture,
keep the test fixture or cable and pins of DUT clean.
Connect the test fixture or cable to HV (-) and INPUT terminals on the instrument front panel.
1.7 Warm-up
1) For accurate measurement, the warm-up time should not be less than 30 minutes.
2) Do not turn on or off the instrument frequently. This may cause internal data confusion.
1.8 Other Features
1) Consumption: ≤50VA
2) Dimensions (W*H*D): 235mm*104mm*360mm; this dimension is the final packaging size.
3) Weight: Approx. 3.6kg

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2)Introduction to Front and Rear Panels
This chapter will describe the basic operation of ST2683A. Before using the instrument, please read
this chapter carefully.
2.1 Introduction to Front Panel
Figure 2-1 shows the front panel of ST2683A.
POWER
1 2 3 4 5 6 7
12 11 9 8
10
INPUT
GUARD
(-)
HV
WARNING:
!
1000VDC MAX OUTPUT;
PLEASE REFER TO THE
"SAFETY SUMMARY" IN
THE OPERATION MANUAL.
MEAS SYSTEM
FILE ENTER
TEST
DISCH.
ST2683A InsulationResistanceMeter
Figure 2-1 Front Panel
1) USB interface
HOST interface of USB
2) LCD and touch screen
480*272 dot-matrix, 24-bit, 4.3-inch TFT and touch LCD is used for measurement setup and
result display.
3) [MEAS]
Press [MEAS] to enter into the MEAS DISP page.
4) [FILE]
Press [FILE] to enter into the page of internal and external File Manage.
5) [SYSTEM]
Press [SYSTEM] to enter into the SYSTEM SETUP page.
6) [ENTER]
Press this key to confirm and store input data.
7) Test terminals (HV-), INPUT, GUARD
(HV-): voltage output terminal
INPUT: sampling input terminal

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GUARD: ground shield terminal
8) [TEST]
When the trigger mode is set as MANU (manual), pressing this key can trigger the instrument
manually.
9) [DISCH.]
Press this key to make the instrument return to discharge state from test state.
10) Universal Arrow Keys
There are four arrow keys: up, down, left and right arrow keys.
11) Trademark and Model
Show instrument trademark and model.
12) POWER
It is the power switch.
2.2 Introduction to Rear Panel
Figure 2-2 shows the rear panel of ST2683A.
1 2 3
456
DEVICE HANDLER
RS-232C FOOT.C RATING FUSE
~T2AL
110V/60Hz
~220V/50Hz T1AL
RS-232C
S/N:
R3-513-00016
7
Figure 2-2 Rear Panel
1) RS232C Serial Interface
It realizes serial communication of the instrument with PC.
2) FOOT.C
External trigger signal, foot switch ST1801-001 (optional) can be used to trigger measurement
when the trigger source is EXT.
3) Power Socket
It is used to input AC power and it is equipped with fuse socket. Fuse will be placed in fuse socket
to protect the instrument.
4) Nameplate
It shows the instrument model.

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5) Ground Terminal
This terminal connects the instrument chassis thus to protect or shield ground connection.
6) HANDLER Interface
Through HANDLER interface, an automatic test system can be conveniently constructed to realize
auto test. ST2683A will output sorting comparator result signals and link signals. Meantime, “START”
signal can be obtained through this interface.
7) USB Interface
PC can remotely control ST2683A through USB DEVICE.
2.3 Display Zone
ST2683A adopts 24-bit 4.3-inch LCD touch screen with a resolution of 480*272. The display screen
is divided into the following zones, as shown in figure 2-3.
Figure 2-3 Display zone
1. Page name
This zone shows the current page name.
2. Function zone
On measurement display page, this zone is used to show the measurement parameters
(parameters on this page can only be shown, but not be changed); on other page, it is used to
change the measurement parameters and zones after colon of functional parameters can be
touched to change.
3. Soft keys
This zone displays the function menu corresponding to the cursor-located zone.
4. Result display

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This zone displays the measurement result and the time of each test procedures (counting down).
5. Prompt information
This zone displays all prompt information.
6. Bin display
This zone displays sorting results of bins (when sorting function is ON).
7. Warning sign
This zone is used to blinking display some warning information, for example, when HV is displayed,
it is warning that there is high voltage in test terminal. The instrument user should be careful.
2.4 Introduction to Buttons on Front Panel
2.4.1 [MEAS]
Press <MEAS> to enter into display homepage. Selectable functions on this page are shown as
follows:
<MEAS SETUP>
<SYSTEM SETUP>
<FILE SETUP>
<SORTING SETUP>
<START SAVING>
2.4.2 [SYSTEM]
Press the [SYSTEM] button to enter into the <SYSTEM SETUP> page; the setup items of system can
be changed on this page.
2.5 Simple Operation
Simple operation steps for ST2683A:
Use [MEAS], [SYSTEM] or [FILE] or soft keys to enter into the page required to enter. (Refer to
figure 2-5)
Use arrow buttons ([←] [↑] [→] [↓]) to move the cursor to desired zone.
When the cursor is moved to a soft key zone, press ENTER to confirm the selection. If it is
required to input a number or a file name, use the keyboard to input and press ENTER to finish
entry. You can use arrow buttons to select a number or a letter.
NOTE: DO NOT use acute units or nails to touch the screen. Doing so will cause damage to
the screen, our company shall not be liable to this case.

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2.6 Starting Up
Ensure the power earth (ground) wire is grounded, plug into a 3-wire power socket. Press down
the power switch on the bottom left corner of the front panel, the instrument will be started up
and a boot screen will be displayed.
Figure 2-4 shows the boot screen of ST2683A, indicating product information such as instrument
trademark, model and version.
Figure 2-4 ST2683A Boot Screen
If the password protection is enabled, you will be asked to input your password. After inputting
your password, press [ENTER] to enter into the main menu page.
NOTE: This series of products have enabled password protection and the default password is
2683. You can reset the password by yourself. Refer to the password function on <SYSTEM SETUP>
page for more details.
Figure 2-5 ST2683A Main Display

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3)Basic Operation
3.1 <MEAS DISP>
Touch the screen or press down [MEAS] and then the <MEAS DISP> page will be displayed on the
screen shown as figure 3-1.
Figure 3-1 Measure Display
The following functions can be achieved by touching the related key in soft key area on this page.
MEAS SETUP (entering into the measurement setup page)
SYSTEM SETUP (entering into the system setup page)
FILE SETUP (entering into the internal file setup page)
PICKOUT SETUP (entering into the pick out setup page)
START Save (the current measurement results will be saved to U-disk by pressing this touch
key. If there is no U-disk inserted in the interface, the measurement results will not be saved;
if there is U-disk, the touch key of START Save will change into STOP Save and it will stop saving
the data into U-disk by pressing the touch key of STOP Save).
NOTE: Be sure to press STOP Save to end saving after START Save. Otherwise, the data may be lost.
The following test condition information will be displayed in measurement/condition display zone
on this page. These conditions (except the measurement internal resistance) can be set on <MEAS
SETUP> page.
MEAS STEP.

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RANGE.
OUTP VOLT.
MONI VOLT.
MEAS MODE.
INTER RES.
3.1.1 Measurement Functions
Measurable parameters on ST2683A are as follows:
Primary Parameters
R (Insulation resistance)
I(Leakage current)
Secondary Parameter
T(Time count value of each procedure)
The measurement results of primary parameters and secondary parameter are respectively
displayed in three lines in the form of large characters. The upper two lines indicate the primary
parameters, while the lower line shows the secondary parameter.
Note:
1. If the primary parameter R exceeds the maximum value of 10TΩ(with RANGE SET: AUTO) or
the selected range (with RANGE SET: LOCK), then (and only then) the display will show ----.
2. Settings and modifications of all functions can be taken by the following steps: 1): Touch the
corresponding function zone and then select the desired function in the soft key zone on the
right side of the screen; 2): Use arrow buttons and [ENTER] button to set and modify the
corresponding function.
3. Settings and modifications of all functions can only be taken in discharging state. Only
discharging key and start saving function response in measurement state.

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3.2 <MEAS SETUP>
Touch the main menu and then touch the soft key <MEAS SETUP> to enter into the <MEAS SETUP>
page shown as figure 3-2.
Figure 3-2 Measurement Setup
The OUTP VOLT, MEAS MODE, CHAR TIME, WAIT TIME, MEAS TIME, DICH TIME, MEAS SPEED,
RANGE SET, LOCK RANGE, CONT CHEC, OPEN CLR and other functions can be set on this page.
3.2.1 OUTP VOLT
This function is used for setting the voltage of the instrument output terminal.
Operation Procedures One for setting the OUTP VOLT:
1. Touch this key to select this option and then the color of this option will become the color of
the cursor.
2. Touch this key again to enter into the soft keyboard and then input the required voltage and
voltage range of 1~1000V (ST2683A four-digit significant figures), 1~500V (ST2683B four-digit
significant figures) through number soft keyboard.
Operation Procedures Two for setting the OUTP VOLT:
Touch the output voltage zone needs to be modified on the screen and the following items will be
displayed in the soft key zone.
↑↑（+ +）
This key is the increase rough adjustment key of output voltage (set value). Touch this key and
then the voltage will increase according to the sequence of the common voltage point. The
commonly used several default voltage points of the instrument are: 1V, 10V, 25V, 50V, 75V,
100V, 125V, 150V, 200V, 250V, 500V (ST2683B), 750V (ST2683A), 1000V (ST2683A).

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↑（+）
This key is the increase fine adjustment key of output voltage (set value). Touch this key and
then the voltage will increase by 1V.
↓（-）
This key is the decrease fine adjustment key of output voltage (set value). Touch this key and
then the voltage will decrease by 1V.
↓↓（- -）
This key is the decrease rough adjustment key of output voltage (set value). Touch this key
and then the voltage will decrease according to the sequence of the common voltage point.
The commonly used several default voltage points of the instrument are: 1V, 10V, 25V, 50V,
75V, 100V, 125V, 150V, 200V, 250V, 500V (ST2683B), 750V (ST2683A), 1000V (ST2683A).
3.2.2 MEAS MODE
This function is used for setting the measurement mode of the instrument.
Steps for setting the MEAS MODE:
Touch the corresponding zone. The following items will be displayed in the soft key zone.
SINGLE
It is used for setting the measurement mode of the instrument as SINGLE.
CONTI
It is used for setting the measurement mode of the instrument as CONTI.
Touch the corresponding key in soft key zone to select the relevant function.
3.2.3 CHAR TIME
This function is used for setting the charge time of the instrument.
Operation Procedures One for setting the CHAR TIME:
1. Touch this key to select this option and then the color will become the color of the cursor.
2. Touch this key (cursor) again to enter into the number soft keyboard, input the required charge
time (correct to 0.1s) through number soft keyboard and then press the ENTER key to confirm
and return to <MEAS SETUP> page.
Operation Procedures Two for setting the CHAR TIME:
Touch the time zone needs to be modified on the screen and the following items will be displayed
in the soft key zone.
↑↑（+ +）
Touch this key and then the instrument will increase the charge time (setvalue) rapidly by 10s.
↑（+）
Touch this key and then the instrument will increase the charge time (set value) by 1s.
↓（-）
Touch this key and then the instrument will decrease the charge time (set value) by 1s.
↓↓（- -）
Touch this key and then the instrument will decrease the charge time (set value) rapidly by
10s.

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Steps for setting the WAIT TIME, MEAS TIME and DICH TIME are the same as CHAR TIME. The
setting range of CHAR TIME, WAIT TIME, MEAS TIME and DICH TIME is 0~999s. When the time is
set to 0s, the step is skipped (details for measurement procedure please refer to 3.4.2). During
DICH time, the discharge current is limited by the 1kΩcharge resistor and a maximum of 5mA. At
the end of MEAS TIME, the last measured value is held and displayed.
3.2.4 MEAS SPEED
This function is used for setting the measurement speed of the instrument.
Steps for setting the MEAS SPEED:
Touch the corresponding zone. The following items will be displayed in the soft key zone.
FAST
It is used for setting the MEAS SPEED as FAST.
SLOW
It is used for setting the MEAS SPEED as SLOW.
Touch the corresponding key in soft key zone to select the relevant function.
3.2.5 RANGE SET
This function is used for setting the range selection mode of the instrument.
Steps for setting the RANGE SET:
Touch the corresponding zone. The following items will be displayed in the soft key zone.
AUTO
It is used for setting the range selection mode as AUTO.
LOCK
It is used for setting the range selection mode as LOCK.
Touch the corresponding key in soft key zone to select the relevant function.
3.2.6 LOCK RANGE
This function is used for selecting the lock range of the instrument.
Steps for setting the LOCK RANGE:
Touch the corresponding zone. The following items will be displayed in the soft key zone.
1mA
It is used for setting the LOCK RANGE as AUTO.
100UA
It is used for setting the LOCK RANGE as 100µA.
10uA
It is used for setting the LOCK RANGE as 10µA.
1uA
It is used for setting the LOCK RANGE as 1µA.
More

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Touch this key and then the following items will be displayed in the soft key zone:
100nA
It is used for setting the LOCK RANGE as 100nA.
10nA
It is used for setting the LOCK RANGE as 10nA.
More
Return.
Touch the corresponding key in soft key zone to select the relevant function.
NOTE: This option can be modified only when the RANGE SET is set as LOCK.
3.2.7 CONT CHEC
This function is used for setting the contact check of the instrument. As the unique contact check
function of ST2683A/ST2683B, this function can well identify the contact performance of
components for capacitance, cable and other capacitive materials and reduce the occurring of
error test. In addition, the contact check will not increase any measurement time.
When the CONT CHEC function is set as ON, NO CONT (NO CONTACT), not R or I will be displayed
on the screen if the instrument is in test mode and no capacitive material is detected.
When the CONT CHEC function is set as OFF, the instrument will test the value directly, not check
the capacitive material.
Steps for setting the CONT CHEC:
Touch the corresponding zone. The following items will be displayed in the soft key zone.
ON
It is used for setting the CONT CHEC as ON.
OFF
It is used for setting the CONT CHEC as OFF.
Touch the corresponding key in soft key zone to select the relevant function.
NOTE: The contact check function is useful when testing capacitive materials and the capacity is
larger than 100pF.
3.2.8 OPEN CLR
This function is used for operating open clear of the instrument.
Steps for setting the OPEN CLR:
Touch the corresponding zone. The following items will be displayed in the soft key zone.
ON
It is used for setting the OPEN CLR as ON. If the open clear is successful, the OPEN CLR state
changes to ON; if the open clear is failing, the OPEN CLR state keeps OFF.
OFF
It is used for setting the OPEN CLR as OFF.
Touch the corresponding key in soft key zone to select the relevant function.
NOTE:
1. If the user operates the open clear successfully, the clear base used in the instrument is the

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base obtained when operating this open clear; if the user operates the open clear
unsuccessfully or sets the OPEN CLR as OFF, the clear base used in the instrument is the
Factory Default.
2. When operating open clear, the user must conform to the condition described in Chapter
One—“Environment”, pull out all the test lines in test terminals and heat the instrument for
more than 30 minutes, otherwise it may result in inaccurate clear base and then affect the
accuracy of measurement results.
3.2.9 Average
This function is used for setting the test average times of the instrument. The set range is 1~199.
Operation Procedures One for setting the CHAR TIME:
1. Touch this key to select this option and then the color of this option will become the color of
the cursor.
2. Touch this key (cursor) again to enter into the number soft keyboard, input the required
average times and then press the ENTER key to confirm and return to <MEAS SETUP> page.
Operation Procedures Two for setting the CHAR TIME:
Touch the average zone needs to be modified on the screen and the following items will be
displayed in the soft key zone.
↑↑（+ +）
Touch this key and then the instrument will increase the average times (set value) rapidly by
10.
↑（+）
Touch this key and then the instrument will increase the average times (set value) by 1.
↓（-）
Touch this key and then the instrument will decrease the average times (set value) by 1.
↓↓（- -）
Touch this key and then the instrument will decrease the average times (set value) rapidly by
10.
NOTE:
1. When the MEAS TIME is set as 0s (i.e. this procedure is set as OFF), the Average times can be
set as 1~999.
2. When the MEAS TIME is not set as 0s (i.e. this procedure is set as ON), the set value of the
Average times is subject to the MEAS TIME. Specifically, the following restriction rules are
required:
(1) When the MEAS SPEED is set as SLOW, it takes 0.06s to make a measurement, so the
restrictive relation between the Average times and the MEAS TIME is:
Average times × 0.06 <= MEAS TIME
(2) When the MEAS SPEED is set as FAST, it takes 0.03s to make a measurement, so the restrictive
relation between the Average times and the MEAS TIME is:
Average times × 0.03 <= MEAS TIME
3. For the same reason, when setting the MEAS TIME, the above restriction rules are also
required.

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3.2.10MEAS DISP
This function is used for setting the MEAS DISP of the instrument as ON/OFF.
Steps for MEAS DISP:
Touch the corresponding zone. The following items will be displayed in the soft key zone.
ON
It is used for setting the MEAS DISP as ON.
OFF
It is used for setting the MEAS DISP as OFF.
Touch the corresponding key in soft key zone to select the relevant function.
3.3 <PICKOUT SETUP>
Touch the soft key PICKOUT SETUP to enter into the <PICKOUT SETUP> page as shown in figure 3-
3.
Figure 3-3 PICKOUT SETUP
The comparator functions of the instrument can be set on this page. ST2683A can set three groups
of limit values for primary parameters.
The function introduction of <PICKOUT SETUP> page
3.3.1 PICK FUNC
This function is used for controlling the switch of the instrument pickout function.
Steps for PICK FUNC:
Touch the corresponding zone. The following items will be displayed in the soft key zone.