EUCOL U2816A User manual

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OP PE ER RA AT TI IO ON N M MA AN NU UA AL L
U2816A Precision LCR meter
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U2816A Operation Manual Contents
II
Contents
Chapter 1Out of Box Audit..........................................................................................................1
1.1To Inspect the package .................................................................................................1
1.2Power connection .........................................................................................................1
1.3Fuse ..............................................................................................................................1
1.4Environment.................................................................................................................2
1.5Use of Test Fixture .......................................................................................................2
1.6Warm-up.......................................................................................................................2 
1.7Other features...............................................................................................................3
Chapter 2Introduction..................................................................................................................4 
2.1Introduction to front panel ...........................................................................................4
2.2Introduction to rear panel .............................................................................................6
2.3Introduction to display zone.........................................................................................7
2.4Main menu keys and corresponding displayed pages ..................................................8
2.4.1[MEAS DISP] ......................................................................................................8
2.4.2[MEAS SETUP]...................................................................................................8
2.4.3[SYSTEM] ...........................................................................................................8
2.5Basic Operation............................................................................................................9
2.6Start the instrument ......................................................................................................9
Chapter 3Introduction to [MEAS DISP] ............................................................................3
3.1<MEAS DISPLAY> .................................................................................................3
3.1.1Test function.........................................................................................................4
3.1.2Test range .............................................................................................................5
3.1.3Test frequency ......................................................................................................6
3.1.4Test level ..............................................................................................................7
3.1.5DC bias.................................................................................................................7
3.1.6Test speed .............................................................................................................8
3.1.7Tools.....................................................................................................................8
3.2<BIN DISP>...............................................................................................................10
3.2.1Comparator function ..........................................................................................10
3.2.2BIN.....................................................................................................................11
3.2.3HIGH/LOW........................................................................................................11
3.2.4COUNT..............................................................................................................11
3.2.5AUX ...................................................................................................................11
3.2.6OUT ...................................................................................................................11
3.3<LIST SWEEP > ...................................................................................................11
3.3.1Sweep mode .......................................................................................................12
3.3.2FUN(Parameter).................................................................................................13
3.3.3FREQ [Hz] LEV[V] BIAS[x] ............................................................................13
3.3.4RESULT.............................................................................................................13
3.3.5COMP (Compare) ..............................................................................................13
3.4<MEAS SETUP>.......................................................................................................13
3.4.1Trigger mode ......................................................................................................14

U2816A Operation Manual Contents
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3.4.2Auto level control function ................................................................................15
3.4.3Bias current isolation function ...........................................................................16
3.4.4Average ..............................................................................................................16
3.4.5Level monitor function.......................................................................................17
3.4.6Delay time ..........................................................................................................17
3.4.7Output impedance ..............................................................................................18
3.4.8Deviation test function .......................................................................................18
3.4.9BIAS SRC ..........................................................................................................19
3.5<CORRECTION>......................................................................................................20
3.5.1OPEN .................................................................................................................21
3.5.2SHORT...............................................................................................................23
3.5.3LOAD.................................................................................................................24
3.5.4Load correction test function..............................................................................26
3.5.5Cable length selection ........................................................................................26
3.6<LIMIT TABLE>....................................................................................................26
3.6.1Swap parameter..................................................................................................27
3.6.2Limit modes of compare function ......................................................................27
3.6.3Set nominal value of tolerance mode .................................................................28
3.6.4Comparator function ON/OFF ...........................................................................29
3.6.5Auxiliary bin ON/OFF .......................................................................................29
3.6.6HIGH/LOW........................................................................................................30
3.7<LIST SETUP>......................................................................................................31
3.7.1MODE................................................................................................................32
3.7.2Test parameter ....................................................................................................32
3.7.3Sweep parameter setup.......................................................................................32
Chapter 4[SYSTEM] and <FILE> ......................................................................................33
4.1<SYSTEM> ...............................................................................................................33
4.1.1SKIN ..................................................................................................................33
4.1.2LANGUAGE......................................................................................................33
4.1.3PASS ALARM ...................................................................................................34
4.1.4FAIL ALARM ....................................................................................................34
4.1.5KEY SOUND.....................................................................................................34
4.1.6PASSWORD ......................................................................................................35
4.1.7SAVE TYPE.......................................................................................................35
4.1.8BUS MODE .......................................................................................................35
4.1.9GPIB ADDR (Reserved function)......................................................................36
4.1.10BAUD RATE .....................................................................................................36
4.1.11DATA/TIME ......................................................................................................36
4.1.12SYSTEM INFORMATION................................................................................36
4.1.13FIRMWARE UPDATE ......................................................................................37
4.1.14SYSTEM TEST .................................................................................................37
4.2<FILE> ....................................................................................................................38
4.2.1Setup file for single-group component (*.EST) .................................................38
4.2.2U-disk manage performance ..............................................................................39

U2816A Operation Manual Contents
IV
4.2.3Operation steps for file management..................................................................40
Chapter 5Execute LCR operation and some examples..............................................................42
5.1Correction operation...................................................................................................42
5.1.1Sweep correction................................................................................................42
5.1.2Point-frequency correction.................................................................................42
5.2Correct connection of DUT........................................................................................43
5.3Eliminate the influence of stray impedance ...............................................................44
5.4Operation example for testing inductance with U2816A ...........................................46
5.5Operation example of testing capacitance by multi-frequency list sweep .................47
5.6Operation example of load correction........................................................................50
Chapter 6Performance and Test .................................................................................................52
6.1Test function...............................................................................................................52
6.1.1Parameter and symbol...............................................................................52
6.1.2Test combination..........................................................................................52
6.1.3Mathematical operation.............................................................................52
6.1.4Equivalent mode ..........................................................................................52
6.1.5Range ...............................................................................................................52
6.1.6Trigger..............................................................................................................52
6.1.7Delay time ......................................................................................................53
6.1.8Connection modes of test terminals.....................................................53
6.1.9Test speed (Frequency>=10kHz)..........................................................53
6.1.10Average ...........................................................................................................53
6.1.11Display digit...................................................................................................53
6.2Test signal ..................................................................................................................53
6.2.1Test signal frequency .................................................................................53
6.2.2Signal mode...................................................................................................53
6.2.3Test signal level............................................................................................54
6.2.4Output impedance.......................................................................................54
6.2.5Monitor for test signal level.....................................................................54
6.2.6Maximum measurement display range ...............................................54
6.3Measurement accuracy...............................................................................................54
6.3.1Accuracies of │Z│,│Y│, L, C, R, X, G, B........................................55
6.3.2Accuracy of D ................................................................................................55
6.3.3Accuracy of Q ................................................................................................55
6.3.4Accuracy of θ.................................................................................................56
6.3.5Accuracy of G ................................................................................................56
6.3.6Accuracy of Rp..............................................................................................56
6.3.7The accuracy of Rs......................................................................................56
6.3.8Accuracy factor.............................................................................................57
6.3.9Accuracy of DCR...........................................................................................59
6.4Safety requirement .....................................................................................................59
6.4.1Insulation resistance ..................................................................................60
6.4.2Insulation intensity .....................................................................................60
6.4.3Leakage current ...........................................................................................60

U2816A Operation Manual Contents
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6.5Electromagnetic compatibility ...................................................................................60
6.6Performance test.........................................................................................................60
6.6.1Working condition........................................................................................60
6.6.2The used instruments and devices .......................................................60
6.6.3Function check..............................................................................................61
6.6.4Test signal level............................................................................................61
6.6.5Frequency.......................................................................................................61
6.6.6Measurement accuracy..............................................................................62
6.6.7Accuracy of C and D ...................................................................................62
6.6.8Accuracy of L.................................................................................................62
6.6.9Accuracy of Z ................................................................................................62
6.6.10Accuracy of DCR...........................................................................................63
Announcement
The description of the manual may not cover all contents of the instrument, and
our company is subject to change and to improve the performance, function,
inner structure, appearance, accessory and package of the instrument without
notice. If there is puzzle caused by inconsistency of manual and instrument, then
you can contact with our company by the address on the cover.

U2816A Operation Manual Chapter 1 Out of Box Audit
1
Chapter 1 Out of Box Audit
When you receive the instrument, some inspections are necessary, and the
condition must be understood and available before installing the instrument.
1.1 To Inspect the package
Inspect the shipping container for damage after unpacking it. It is not
recommended to power on the instrument in the case of a damaged container.
If the contents in the container do not conform to the packing list, notify us or
your dealer.
1.2 Power connection
1) Power-supplying voltage range: 99~243Vac. Being related with the power
setup on the rear panel.
2) Power-supplying frequency range: 47~63Hz.
3) Power-supplying power range: less than 60VA.
4) Power supplying input phase line L, zero line N, ground lead E should be as
same as the power plug of the instrument.
5) After careful design, the instrument can reduce the clutter jamming caused
by AC power terminal input, however, it should be used under the
environment with low-noise. Please install power filter if being unavoidable.
———————————————————————————————————————
Warning: In order to prevent user and instrument from being hurt by
leakage, it is necessary for user to guarantee the ground line of supply
power being reliably grounded.
———————————————————————————————————————
1.3 Fuse
The instrument has installed fuse, so operators should use the installed fuse of
our company.
———————————————————————————————————————
Warning: Be sure that the location of fuse is consistent with
power-supplying voltage range before charging.
———————————————————————————————————————

U2816A Operation Manual Chapter 1 Out of Box Audit
2
1.4 Environment
1) Please do not operate the instrument in the place that is vibrative, dusty,
under direct sunlight or where there is corrosive air.
2) The normal working temperature is 0℃～40℃, relative humidity ≤75%, so
the instrument should be used under above condition to guarantee the
accuracy.
3) There is heat abstractor on the rear panel to avoid the inner temperature
rising. In order to keep good airiness, please don’t obstruct the left and right
airiness holes to make the instrument maintain the accuracy.
4) Although the instrument has been specially designed for reducing the noise
caused by ac power, a place with low noise is still recommended. If this
cannot be arranged, please make sure to use power filter for the instrument.
5) Please store the instrument in the place where temperature is between 5℃
and 40℃, humidity is less than 85%RH. If the instrument will not be put in
use for a time, please have it properly packed with its original box or a similar
box for storing.
6) The instrument, especially the test cable should be far from strong
electro-magnetic field, to avoid the jamming on measurement.
1.5 Use of Test Fixture
Please use the accessory test fixture or cable, the test fixture made by user or
from other company may cause the incorrect measurement result. The
test fixture or cable should be kept clean, as well as the pin of DUT, thus to
guarantee the good connection between DUT and fixture.
Connect the fixture or cable to four test terminals Hcur, Hpot, Lcur, Lpot on the
front panel. As for the DUT with shielding shell, connect shielding layer or ground
“”.
Note: When test fixture or cable has not being installed, the instrument will
display an unstable test result.
1.6 Warm-up
1) To guarantee the accurate measurement, the warm-up time is no less than
15min.
2) Please not turn on or off instrument frequently, in order to avoid the inner
data fluster.

U2816A Operation Manual Chapter 1 Out of Box Audit
3
1.7 Other features
1) Power: consumption power≤60VA.
2) Dimension (W*H*D): 350mm*120mm*360mm
3) Weight: About 3.5kg.

U2816A Operation Manual Chapter 2 Introduction
4
Chapter 2 Introduction
In this chapter, the basic operation features of U2816A are described. Please read
the content carefully before using U2816A instruments, thus you can learn the
operation of U2816A.
2.1 Introduction to front panel
Figure 2-1 shows the front panel of U2816A.
1) USB HOST interface
Connect U flash disk so as to save or use a specified file.
2) Brand and model
Brand and model
3) LCD
480*272 colorful TFT LCD displays measurement results and conditions.
4) [CLEAR]
Execute the calibration operation. Press this key to execute OPEN/SHORT
calibration.
5) [SYSTEM]
Press this key to enter into the system setup page.
6) [SAVE]
Copy the currently displayed page to USB memory.
7) [FILE]
Press [FILE] key enter into the display page of file list.
8) [MEAS DISP]
Press this key to enter into the display page of measurement display.
9) CURSOR
This key is used to move the cursor on the LCD displayed page. When the
cursor moves to a zone, the corresponding zone will be lightened.
10) [MEAS SETUP]
Press this key to enter into the setup page of measurement setup.

U2816A Operation Manual Chapter 2 Introduction
5
11) Numerical keys
These keys are used to input data to the instrument. The key consists of
numerical keys [0] to [9], decimal point [.] and [+/-] key.
12) [←]
BACKSPACE key is used delete the last numeric of the input value.
13) [ESC]
ESCAPE key
14) PASS indicator
LED indicator shows the test result has passed.
15) FAIL indicator
LED indicator shows the test result has failed.
16) [DC SOURCE]
This key is used to permit or forbid the output of a 10V individual voltage
source.
17) [DC BIAS]
[DC BIAS] is used to permit or forbid the output of 0-100mA/10V DC bias
source. Press this key, it will be lighted which means DC bias output is
permitted. Press this key once more, it will be off which means DC bias output
is prohibited. The key is useless in some pages where the DC BIAS cannot be
added.
18) [TRIG/ENTER]
This key is used to end the input of data, and confirm and save the data
displayed on the inputting line (the bottom line on LCD).
When the trigger mode is set to MAN mode, press this key to trigger the
instrument.
19) Test terminals (UNKNOWN)
4-teminal test pair are used to connect 4-terminal test fixture or cable to
measure DUT.
The 4 terminals are respectively as follows: Hcur, Hpot, Lpot and Lcur.
20) [LOCK/LOCAL]
Press this key, the buzzer will beep, which means the function of current
panel is locked. Press it again, it will be off, which means discharging the lock
status. If the password function is ON, it means correct password is
necessary when discharging the key-lock, or the key cannot be unlocked.
21) Ground terminal
The ground terminal is connected with the case of instrument, which can be
used to protect or shield the ground connection.
22) [TRIG]
When the trigger mode is set to MAN mode, press this key to trigger the
instrument.
23) Soft keys
Six soft keys are used to select parameters. The corresponding function of
each soft key has been displayed on its left (the right part of LCD). The
function definition varies with different pages.

U2816A Operation Manual Chapter 2 Introduction
6
24) POWER
Power switch
2.2 Introduction to rear panel
Figure 2-2 shows the rear panel of U2816A.
1) SCANNER interface (Option)
Control the transformer scanning box through SCANNER interface.
2) External trigger interface
Handler interface is used to realize the sorting output of test results.
3) IEEE-488 interface (Option)
The tester can communicate with PC through GPIB interface.
4) LAN interface (Option)
LAN interface is used to realize the control and the communication of network
system.
5) Fan window
Heat elimination, maintaining the normal working temperature
6) Power socket
Input AC power.
7) Fuse base
Being used to install power fuse, protect instrument.
8) Ground terminal
Connect the case with the ground.
9) USB DEVICE interface
The tester can communicate with PC through the USB DEVICE interface.
10) RS232 interface
Series communication interface can realize the communication with PC.
11) Serial number
Information about production date, instrument number and manufacturer
1
2
11
1
0
9
8
7
6
5
4
3
21
Figure 2-2 Rear panel

U2816A Operation Manual Chapter 2 Introduction
7
etc..
12) HANDLER interface
Handler interface is used to realize the sorting output of test results.
———————————————————————————————————————
Warning: Be sure that the direction of fuse is accordant with
power-supply voltage range before charging.
———————————————————————————————————————
13) Ground terminal
The ground terminal is connected with instrument casing, being available for
protecting or shielding ground connection.
2.3 Introduction to display zone
U2816A applies a 65k, 5-inch TFT display. The display screen is divided into the
following zones:
Figure 2-3 display zones
1) Logo
Display the logo of the company.
2) Time
Display the current time.
3) Display page name
Indicate the name of the currently displayed page.
4) Tools menu
When the cursor moved the area, the softkey area will display the
corresponding specific tools
5) System icon zone
In this zone, display the system status:
U disk is connected
Romot control status.
±Keyboard locked.
12 3 4 5
6 78

U2816A Operation Manual Chapter 2 Introduction
8
§Data recording status.
DC bias is opened.
6) Help
In this zone, information about system and user data input is displayed.
7) Test result/ condition display zone
In this zone, test result information and current condition are displayed.
8) Soft keys
The zone is used to display the function definition of soft key. The definition of
soft key can be different as the difference of cursor’s direction in the zone.
2.4 Main menu keys and corresponding displayed
pages
2.4.1 [MEAS DISP]
Press this key-[MEAS DISP] to enter into the LCR measurement display page,
the following soft keys will be displayed in the soft key zone.
<MEAS DISPLAY>
<BIN DISPLAY>
<PASS FAIL>
<LIST SWEEP>
<GRAPH SWEEP>
2.4.2 [MEAS SETUP]
Press this key-[MEAS SETUP], the following soft keys will be displayed in the
soft key zone on the LCR measurement setup page.
<MEAS SETUP>
<CORRECTION>
<LIMIT TABLE>
<LIST SETUP>
<GRAPH SETUP>
2.4.3 [SYSTEM]
This key-[SYSTEM] is used to enter into the system setup page. The following
soft keys will be available:
<SYSTEM SETUP>
<SYSTEM INFO>
<FIRMWARE UPDATE>
<SYSTEM TEST>

U2816A Operation Manual Chapter 2 Introduction
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2.5 Basic Operation
Basic operation of U2816A is as follows:
Use menu keys ([MEAS DISP], [MEAS SETUP], [SYSTEM]) and soft keys to
select the desired page.
Use cursor keys ([←][→]) to move the cursor to the desired zone. When the
cursor moves to a specified zone, the zone will become reverse expression.
The soft key functions corresponding to the current zone of the cursor will be
displayed in the soft key zone. Users can select and use the desired key.
Numeric keys, [BACKSPACE] and [ENTER] are used to input data.
When a numeric key is pressed down, the usable unit soft key will be
displayed in the soft key zone. You can choose a unit soft key or press [ENTER]
to end data inputting. When [ENTER] is used to terminate data inputting, the
unit of data will be set to a default unit, such as Hz, V or A. For example, the
default unit for frequency is Hz.
2.6 Start the instrument
Plug in 3-line power plug.
Caution: Keep the power-supply voltage and frequency conform to above
specifications. Power input phase line L, zero line N, ground line E should be the
same as that of the instrument.
Press the power switch at the left corner on the front panel and then a boot screen
will appear which displays our company logo.
If the password protection function is on, users are required to input the
password and then press [ENTER] to enter into the page of main menu.
———————————————————————————————————————
Note: The instrument has a default password-123456. In your practical use,
you can change it and set your own one. Please see <SYSTEM> section for more
information.

U2816A Operation Manual Chapter 3 Introduction to [MEAS DISP]
3
Chapter 3 Introduction to [MEAS
DISP]
3.1 <MEAS DISPLAY>
Press [MEAS DISP], the <MEAS DISPLAY> page will be displayed on screen as
shown in the following figure.
On this page, the test result is displayed in right area. The measurement control
parameters can be set in this page:
Test function (FUNC A-B)
Test function (FUNC C)
Test function (FUNC D)
Test frequency (FREQ)
Test level (LEVEL)
Test speed (SPEED)
Test range ( RANGE)
DC bias
There are 8 zones in this page: FUNC A-B, FUNC C, FUNC D,FREQ, LEVEL, RANG,
SPEED, DC BIAS. The details will be discussed later.
The test result/ condition display zone shows the information about test condition.
These conditions can be set on <Meas Setup> page or <Correction> page.
Signal source voltage/ current monitor (Vm, Im)
Open, short, load correction ON/OFF status (CORR)

U2816A Operation Manual Chapter 3 Introduction to [MEAS DISP]
4
3.1.1 Test function
In a measurement period, U2816A can test four parameters for an impedance
component. Parameters that can be tested are as follows:
Primary parameters
|Z| (Module of impedance)
|Y| (Module of admittance)
L (Inductance)
C (Capacitance)
R (Resistance)
G (Conductance)
DCR (DC resistance)
Secondary Parameters
D (Dissipation factor)
Q (Quality factor)
Rs (Equivalent Series Resistance ESR)
Rp (Equivalent Parallel Resistance)
X (Reactance)
B (Admittance)
θ(Phase Angle)
Test results of primary and secondary parameters are respectively displayed in
two lines in the form of upper-case characters. The primary parameter displays in
the upper line while the secondary parameter displays in the lower line.
Operation steps for setting test function:
1) Move the cursor to FUNC A-B zone, the following soft keys will be displayed on
the screen.
OFF
Cp—D
Cp—Q
Cp—G
Cp—Rp
More
2) Select and press a softkey to set test function. If the softkey you need is not
displayed on the page，press More to display the following softkeys.
Less
Cs—D
Cs—Q
Cs—Rs
More
3) Select and press a softkey to set test function. If the softkey you need is not
displayed on the page，press More to display the following softkeys.
Less
Lp—D
Lp—Q

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Lp—G
Lp—Rp
More
4) Select and press a softkey to set test function. If the softkey you need is not
displayed on the page，press More to display the following softkeys.
Less
Ls—D
Ls—Q
Ls—Rs
More
5) Select and press a softkey to set test function. If the softkey you need is not
displayed on the page，press More to display the following softkeys.
Less
R—X
Z—θr
Z—θ°
Rs—Q
More
6) Select and press a softkey to set test function. If the softkey you need is not
displayed on the page，press More to display the following softkeys.
Less
G—B
Y—θr
Y—θ°
Rp—Q
More
7) Select and press a softkey to set test function. If the softkey you need is not
displayed on the page，press More to display the following softkeys.
Less
Ls—DCR
Lp—DCR
Parameter setup of FUNC C and FUNC D are the same as that of FUNC A-B, but
FUNC C and FUNC D is only choice one parameter.
3.1.2 Test range
Measurement range should be selected in accordance with the impedance value
of the tested LCR component.
U2816A has 10 AC measurement ranges: 1Ω, 10Ω,30Ω, 100Ω, 300Ω, 1kΩ, 3kΩ,
10kΩ, 100kΩ, 1MΩ.
U2816A has 10 DCR measurement ranges: 1Ω, 10Ω, 30Ω, 100Ω, 300Ω, 1kΩ, 3kΩ,
10kΩ, 100kΩ, 1MΩ.
Operation steps for setting test range:
1) Move the cursor to the range zone, the following soft keys will be displayed:

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AUTO The soft key is used to set the range mode to AUTO.
HOLD The soft key is used to switch the AUTO mode to the HOLD mode.
When the range mode is set to HOLD, the range will be locked in the
current measurement range. The current measurement range will be
displayed in the range zone.
INCR+ The soft key is used to increase the range under HOLD mode.
DECR- The soft key is used to decrease the range under HOLD mode.
2) Use soft keys to set measurement range.
3.1.3 Test frequency
The measurement range of U2816A ranges from 20Hz to 200kHz with an increase
or decrease of 0.01Hz.
Operation steps for setting test frequency:
U2816A provides two methods to set measurement frequency. The first one is to
use soft keys and the other one is to input data by using numeric keys.
1) Move the cursor to the FREQ zone, the following soft keys will be displayed.
INCR++
This is a coarse adjustment soft key used to increase the frequency. Press
this key, the frequency will change as the following sequence: 20Hz,
100Hz, 1kHz, 10kHz, 100kHz, 200kHz.
INCR+
This is a fine adjustment soft key used to increase the frequency. Press
this key, the frequency will switch between the following ones:
20 Hz 100 Hz 1 kHz 10 kHz 100 kHz
25 Hz 120 Hz 1.2 kHz 12 kHz 120 kHz
30 Hz 150 Hz 1.5 kHz 15 kHz 150 kHz
40 Hz 200 Hz 2 kHz 20 kHz 200 kHz
50 Hz 250 Hz 2.5 kHz 25 kHz
60 Hz 300 Hz 3 kHz 30 kHz
80 Hz 400 Hz 4 kHz 40 kHz
500 Hz 5 kHz 50 kHz
600 Hz 6 kHz 60 kHz
800 Hz 8 kHz 80 kHz
DECR-
This is a fine adjustment soft key used to decrease the frequency. The
selectable frequencies are the same as that of INCR+.
DECR--
This is a coarse adjustment soft key used to decrease the frequency. The
selectable frequencies are the same as that of INCR++.
2) Use soft keys or numeric keys to select or set frequency. When using numeric
keys to input the required frequency value, the soft key displays the available
frequency units (Hz, kHz and MHz). You can use unit soft key to input unit and

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data. When using [ENTER] to input frequency, the default unit is Hz.
3.1.4 Test level
The measurement level of U2816A can be set according to the RMS value of sine
wave signal. The frequency of sine wave signal is the test frequency which is
generated by inner oscillator. You can set measurement voltage or current. The
output impedance of U2816A signal source can be 10Ω, 30Ω, 50Ωor 100Ω.
———————————————————————————————————————
Note: The measurement current is the output one when the tested
terminal is short, while the measurement voltage is the output one when
the tested terminal is open.
———————————————————————————————————————
The auto level control function of U2816A can realize the measurement of
constant voltage or current. The auto level control function (ALC) can be set as
ON in <MEAS> page. When the auto level control function is set to ON, “*” will be
displayed following the current level value. Refer to <MEAS> for more
information.
Operation steps for setting test level:
U2816A provides two methods to set the level of test signal source. The first one
is to use soft keys, while the second one is to input data by numeric keys.
1) Move the cursor to LEVEL, the following soft keys will be displayed.
INCR+
This soft key is used to increase the level of test signal source.
DECR-
This soft key is used to decrease the level of test signal source.
2) Soft or numeric keys are used to select or set the test level. When numeric
keys are used to input the desired level, the available units (mV, V, µA, mA
and A) will be displayed in the soft key zone. Users can use these unit keys to
input unit and data. When [ENTER] is used to terminate the input of level, the
default level is V or A.
———————————————————————————————————————
NOTE: When you need to switch the level between current and voltage,
numeric keys and unit soft keys must be used.
———————————————————————————————————————
3.1.5 DC bias
U2816A provides internal DC bias voltage from -10V to +10V.
Operation steps for setting DC bias:
U2816A provides two methods to set the DC bias. The first one is to use soft keys,
while the second one is to input data by numeric keys.

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1) Move the cursor to DC BIAS, the following soft keys will be displayed.
INCR+
This soft key is used to increase the output level of DC bias.
DECR-
This soft keys is used to decrease the output level of DC bias.
2) Soft or numeric keys can be used to select or set the DC bias source. When
numeric soft keys are used to input the desired bias level, the available units
((mV, V, µA, mA and A) will be displayed in the soft key zone. Users can use
these soft keys to input unit or data. When [ENTER] is used to terminate the
input of bias value, the default unit is V or A.
———————————————————————————————————————
NOTE: When you need to switch the DC bias level between current and
voltage, numeric keys and unit soft keys must be used.
———————————————————————————————————————
Press the [DC BIAS] key on the front panel to allow the output of DC bias. When
DC bias is permitted to output, the [DC BIAS] key will be lighted.
3.1.6 Test speed
The test speed of U2816A is determined by the following factors:
Integration time (A/D conversion)
Average times (average test times per each test)
Measurement delay (from startup to the start of measurement)
Display time of test results
You can select test mode as FAST, MED or SLOW. Generally, the test result is more
stable and accurate in SLOW test mode.
Operation steps for setting test speed:
1) Move the cursor to SPEED, the following soft keys will be displayed:
FAST
MED
SLOW
2) Use above soft keys to set the test speed.
3.1.7 Tools
The test result of U2816A is displayed as 6 floating-point digits. Decimal point
lock function can make U2816A output the test result in fixed way. Meanwhile this
function can change the displayed count of test result. This displayed result can
be selected to be shown in large character or small character.
Operation steps for tools
Set the display mode of decimal point in fixed mode according to the following
operation steps. Also the character size of test result can be set.
1) Move the cursor to TOOL zone, the following soft keys will be displayed: