East Tester ET3240 User manual

ET3240 4% Benchtop Digital Multimeter
ET3255 5% Benchtop Digital Multimeter
User’s Manual
Hangzhou Zhongchuang Electronics Co. Ltd.

Table
of
Contents
1 Safety Precautions..……
2 Introduction. Bite.
2.1 Main features :
2.2 General features
3 Quick reference. Ee
3.1 check the accessories of the produ
3.2 Appearance of the front pane
3.4 Keys introductton… … …
34.1 Power Switch key.
3.4.2 Arrow keys.…
3.4.3 Basic measurement function keys.
3.4 4 Mathmatic function keys.
34.5 Additional function keys…
3.4.6 Second function key combinatior
3.5 Rear panel introduction.…
3,6 Adjust the handle.
3.7 Tum on the multimeter…
4 Basie measurement function
4.1 Voltage measurement … ……
4.1.1 DC Voltage measurement.
4.1.2 AC voltage measurement.
4.2 Current measurement _… … … ……
42.1 DC eurrent measurement.
4.2.2 AC current measurement…
4.3 Resistance measurement. ao
4.3.1 2-wire resistance measurement…
4.3.2 4-wire resistance measurement.
4 A Frequency measurement and period measurement.
AA. Frequency measurement…
4.4 2 Pernod measurement.
4.5 Diode measurement and on-ofl measurement.
4.5.1 Diode measurement.
4.5.2 On-off measurement ….
4.6 Capacitance measurement
4.7 Duty eycle measurement.
5 Additional measurement function.
51 Statistics
5.2 MX+B.….
5.3 dB and dBm.
SAREL.
5.5 Pass/Fail.
SOM.
5.7 Data storage and readbac!
5.8 Temperature. …
6 System settings.

6.1 Language switch.
6.2 Buzzer switch
6.3 Screen brightness adjustment.
6,4 Interface style selection…
7.1 Temperature.
8 Calibration.
8.1 DC voltage calibration.
8.2 AC voltage calibration.
8.3 DC current calibration…
84 AC current calibration.
8.5 Resistance calibration…
8,6 Capacitance calibration
9 Communication Interface …
10 Related software installation and use.
LL Maintenance and upkeep… …… … …
11.1 General maintenance and repair.
112 Replace the fuse

5 V2 Digital Multimeter User Manual
1 Safety Precautions
To
avoid
personal
injury
and
prevent
damage
to
the
instrument,
be
sure
to
use
this
instrument
in
accordance
with
the
manual.Before
fully
understanding
and
meeting
the
following
warning,do
not
proceed
to
the
next
step.
Safety ground:
Connect the power cord of the instrument to a grounded socket. Make sure that the instrument is
reltably grounded,
Use proper fuse:
Please use only fuscs of the specified type and rating.
Proper use of lead set:
Do not use damaged or worn test lead set. When using probes, the finger should be kept behind the
finger protector of the probe. When wiring, you should connect the common line first and then connect
the charged test lead. When disconnecting, disconnect the charged test lead first.
IF the instrument malfunctions, do not use:
Its
protection
may
be
impaired,
do
not
install
substitute
parts
or
conduct
unauthorized
adjustment
of
the
instrument.
Please
return
the
instrument
for
repair
or
professional
inspection
to
ensure
their
safety
features.
Do
not
use
this
instrument
at
high
temperature,
or
environment
with
explosives
or
strong
electromagnetic
field.
Do not change the wiring inside the instrument, so as not to cause damage to the instrument or
endanger the safety.
When measuring, you must select the correct measurement function and (he measurement
range.
Before the function range is switched, disconnect the probe and the circuit under test to
prevent damage to the instrument.
Protect limits:
Without exceeding the protection linnts, the protection circuit of this instrument prevents damage to
the instrument and shock hazard. To ensure the safe operation of the instrument, do not exceed the marked
Limits for protection on front and rear panels.
IEC measurement type H overload protection:
To
avoid
the
risk
of
electric
shock,
this
instrument
provides
overload
protection
for
the
mains
under
the following two conditions.
1) HI and LO input terminals under the condition of the measurement type Il (as described below)
are connected to mains.
2) ‘The maximum hine voltage of mains is 300 VAC.
In order to avoid blown fuse or damage to the meter, be sure to follow these tips to use the
current input terminals.
1) 10 A and 200mA input terminals are not allowed to sitnultaneously connect to the current
measurement circuit.
2) Ifthe effective value of the measured current AC + DC 15 withun the vange from 200mA to 10 A,
only 10A and LO terminals are allowed to be used in the measurement.
3) Before performing current measurement, be sure to select the correct current input terminal
according to the expected current size.

5 1/2 Digital Mulumeter User Manual
4) The current input to the terminal 10 A must not exceed TOA, otherwise, the internal fuse inside
the multimeter will blow; and the current input to 200mA terminal must not exceed 5OOmA;
otherwise, the current imput fuse on the rear panel will blow.
Warning:
IEC measurement type I includes the electrical device one of whose sockets on the branch circuit is
connected to mains, Such devices include most small appliances, test equipment, and other equipment
inserted into the branch socket.
The voltage higher than 300 VAC can only be measured in the circuit with the mans cut off.
However, there is transient overvoltage in the circuit with the mains cut off This instrument can withstand
up to 2500 Vpk of oecasional transient overvoltage safely. Do not use this instrument to measure the
circuit with a transtent overvoltage higher than (lus level.
This instrument can be used for such measurements: HI and LO inputs are connected to mains of
such devices (up to 300 VAC), or to the branch outlet. However, the HI and LO inputs terminals of this
instrument cannot be connected to the mains in the permanently installed electrical devices, such as the
main circuit-breaker panel, sub-panel fuse boxes, or permanently wired motors. Such devices and circuits
ument for overload protection can easily exceed (he limit of thus ms
Environment related notes:
“This instrument complies with the requirements on marking under WEEE Directive (2002/96 / EC).
According to the label on the instrument (see below), do not dispose the electrical / electronic equipment
along with household waste together.
‘Thus instrument may contain substances that might be harmful to the environment or human healtir,
in order to avoid the release of hazardous substances into the environment or harm to human health, we
recommend the use of appropriate methods to recycle thus instrument in order to ensure that most of the
materials are reused or recyeled. For disposal or recycling related information, please contact the local
authorities.
EEE
Instrument category:
According to Appendix 1 of the WEEE Directive, the instrument is classified as a "monitored
and controlled instrument’.
Signs on the product:
The following signs might be seen on the instrument:
PA A
/
Signal ground chassis ground High voltage Refer to Manual
Limited warranty and liability.
‘The company 1s responsible for free repaur or replacement within one year from the date of purchase,
but does not include damage to fuse and damage caused by human factors.
2 Introduction
XXXXSS is a 5: digits, 240000 counting, dual digital benchtop true-RMS multimeter The STM32
chip and external double integral AD used by this benchtop multimeter providing accurate measurement

5 1/2 Digital Multimeter User Manual
and
stable
performance.
3.5
inch
320
*
480
high
resolution
TFT
LCD
screen
makes
a
clear
reading,
rich
display,
and
a
good
visual
effects.
This
benchtop
multimeter
are
powered
by
electricity
and
provide
full-function,
full-range
overload
protection.
Fresh
and
simple
design
with
excellent
performance
makes
them
an
ideal
choice
for
electricians,
electronics
enthusiasts,
engineers
and
colleges
and
universities.
2.1 Main features
® 5 digits, 240000 counting,
3.5-inch 320 * 480 TFT LCD.
Dual
parameter
display:
it
can
display
two
parameters
of
the
same
input
signal.
Measurement
display
rate:
FAST
(7
times
/
second),
MID
(5
times
/
sec),
SLOW
(2
times
/
sec).
‘Trigger
mode:
Automatic
trigger,
single
trigger,
external
trigger.
Range switching mode: Auto / Manual.
12
basic
measurement
functions:
AC
and
DC
voltage,
AC
and
DC
current,
two-wire
/
four-wire
resistance,
period
/
frequency,
diode,
on-off
test,
capacitance,
duty
cycle.
® DCV basic accuracy: 0,01%.
®
Additional
functions:
Data
hold,
data
storage,
data
readback.
®
Mathematical
functions:
MX+B/MAX/MIN/Average/dBB/dBm/Rel/Limits
Compare/
Statistics/%a/
IX
®
Temperature:
Thermocouple:
K/N/R/S/T/B/F/I/WRe325/WRe526,
Thenmal
resistance.
PT
100
/
PTS0/Cul00
/
Cu50.
®
Built-in
(hermocouple
cold
junction
temperature
compensation.
Support
Manual
or
Auto
temperature
compensation
mode
keys can be locked.
Open calibration function
Square wave output
Provide
system
settings,
can
configure
the
language,
buzzer,
sereen
brightness,
interface
display
style.
Communication
Interface:
Standard:
USB
Device.
RS232;
Optional.
USB
Host,
GPIB,
LAN,
WIFI,
Bluetooth.
® Support SCPI protocol.
2.2 General features
Power
supply
voltage:
220V
AC
10%,HOV
AC
4
10%,45-6SHz.
Working
environment::
0-40'C,
relative
humidity
=80%.
Storage
environment:
-10-50'C,
relative
humidity
<80%
Dimensions:
265mm*
10Smm*30Smm(width*height*depth).
. Weight: 2.3kg.
ene
3 Quick reference
3.1
check
the
accessories
of
the
product
Confirm
the
following
accessories
of
the
multimeter,
among
which
the
optional
accessories
are
delivered
if'only
ordered.
[Fany
items
are
missing,
please
contact
the
nearest
sales
office.
Standard
accessories:
Optional
accessories:
A
ir
of
proe:
ï
ì
RS232
senal
lime.
A
efiieesi
8
USB
cable
A
double
end
three-wire
power
line.
8
Two
back:
fi
GPIB
cable.
wo
up
power
fuse,
par
User manual.

5 1/2 Digstal Multumeter User Manual
Standard and optional function/information of communication interface:
Standard communication interface USB Device, RS232
Optional communication interface GPIB, USB Host, LAN, WIFI, Bluctooth
Standard function Square wave output, Extemal trigger
Table 3-1 Standard/optional functions and communication interfaces.
3.2 Appearance of the front panel
Front panel as shown in Figure 3- 1, the regional description see Table 3-2
2 3
ete al.
2. 00000 «
100, 0
Figure 3-1 Front panel diagram
Description
fl Measurement ternimal of multimeter.
2 Display screen.
3 Basic measurement function keys.
4 Arrow keys. 5
5 Mathematical function keys.
6 Additional function keys,
7_{Powerkey
Table 3-2 Area description of front panel
3.3 Display interface
AUTO TRI
ALTO 2V
Slow Local el
Figure 3-2 Interface of the display
NO. Description
1 Displays the name of the current measurement function.
B Display Tngger Mode Auto Trigger, Single Trigger, External Trigger.
3 Display only m automatic mode, indicate the currently range

5 1/2 Digital Multimeter User Manual
4
Main
display
area.
Displays
the
current
measured
value.
5
Secondary
display
arca.
Displays
additional
information
about
the
current
É measured value.
6
‘The
configuration
area
of
the
current
measurement
function.
Display
range,
measurement
speed,
additional
functions,
local
/
remote
information.
Figure
3-3
Description
of
the
interface
area
3.4 Keys introduction
3.4.1 Power Switch key
bran On / Off the main power.
3.4.2 Arrow keys
Ee
Enzer
Up
arrow
key.
Y_Down
arrow
key.
Enter
key.
<
Id
Left
arrow
key.
Right arrow
key
3.4.3
Basic
measurement
function
keys
DC voltage measurement key.
AC
voltage
measurement
key
DC current measurement key.
AC current measurement key.
2-wire / 4-wire resistance measurement key.
Capacitance measurement key.
Frequency / period measurement key.
Diode / on-oll measurement key.
3.4.4 Mathmatic function keys
Statics
key.
In
the
voltage
(DC
voltage,
AC
voltage),
current
(DC
current,
AC
current),
resistance
(two-wire
resistance,
four-wire
resistance),
frequency,
period,
capacitance
measurement
function,press
the
key
to
turn
on
the
statistical
operation.(
Contains
the
maximum,
minimum,
average,
standard
deviation,
number
of
samples,
range.)
MX
1
B
function
key
combination.
In
the
voltage
(DC
voltage,
AC
voltage),
current
(DC
current,
AC
current),
resistance
(two-wire
resistance,
four-wire
resistance),
frequency,
petod,
capacitance
measurement
function,
press
the
key
combination
to
turn
on
the
MX
+
B
measurement
function.
Press
the
combination
key
again
to
exit
the
MX
+
B
function.
dB
measurement
key.
In
the
voltage
(DC
voltage,
AC
voltage)
measurement
function,

5 1/2 Digital Mulumeter User Manual
press the key, the dB value of the measured value will be displayed on the secondary display area. The
reference voltage can be modified, the default is 1 V.
dBm measurement key. In the voltage (DC voltage, AC voltage) measurement function,
press the key, the dBm value of the measured value will be displayed on the secondary display area. The
reference resistance can be modified, the default is 6000.
Relative value measurement key. In the voltage (DC voltage, AC voltage), current (DC
current, AC current), resistance (two-wire resistance, four-wire resistance), frequency, period, capacitance
measurement function, press the key, the measured value will be subtracted from the relative value in the
secondary display area and displayed mm the main display. le the main value — the measured value - the
relative value. Relative value can be modified.
3.4.5 Additional function keys
u
tek Square wave output key. Press the key, a amplitude fixed, frequency adjustable square
wave will be output from the rear panel.
wan
un] Duty cycle measurement key Press the key to turn on the duty cycle measurement
function.
ar
zo) Automatic key. In manual range mode, press the key to switch to auto range. In external
trigger / single trigger mode, press the key to change the trigger made to auto trigger.
TRIG
an | Single trigger key. Press the key to change the multimeter measurement mode to single
trigger. Each time the key is pressed, the meter measures once and displays a reading
Er
SME Save key. Press the key to save the relevant information of the current measured value;
press the key again to exit the data save function.
IEA
ee Data read back key. Press this key to enter the data readback function. Press any of the
basic measurement function keys to exit the data readback function. The data readback function displays
relevant information about the measured values that have been stored. Press (he up / down arrow key to
select the measured values for a specific sequence number.
mr
ee | System settings key. Press the key to view the instrument model, serial number, version
number, but also can set the language, switch buzzer, adjust the screen brightness, switch the interface
display style.
3.4.6 Second function key combination
wa
van | Reading hold function key combination. Press the key combination, the instrument
readings remain unchanged, press the key combination again to exit the reading hold function.
j U
Mee AC # DC measurement function key combination Press the key combination to
start AC + DC signal measurement, press the key combination again to exit AC + DC measurement
Fametion,
mie
ml External trigger function key combination. Press the key combination to turn on

5 1/2 Digital Multimeter User Manual
the
external
trigger
measurement
mode.
In
this
mode,
when
the
external
trigger
terminal
enters
a
negative
pulse,
the
meter
measures
once
and
displays
a
reading.
cal
wmo | Calibration function key combination. In the voltage (DC voltage, AC voltage),
current (DC current, AC current), resistance (two-wirc resistance, four-wire resistance), capacitance
measurement function, press the key combination to enter the corresponding calibration function, Press
any of the basic measurement function keys to exit the calibration function.
Limit comparison function key combination. In the voltage (DC voltage, AC
voltage)
measurement
function,
press
the
key
combination
to
turn
on
the
Lint
comparison
function.
The
Limit
comparison
value
can
be
modified.
EXIT
2e | Exit kev. Press this key to switch from the current measurement function to the
basic measurement function before the last function switch.
The temperature measurement function key combination. Press the key
combination to turn on the temperature measurement function. Depending on the type of temperature
sensor used, press the up / down / lefl / right arrow key to select the corresponding temperature sensor
type [or temperature measurement.
Hon
de
System
help
key
combination.
In
the
voltage
(DC
voltage,
AC
voltage),
current
ij
(DC current, AC current), resistance (two-wire resistance, four-wire resistance), frequency. peiod,
capacitance measurement function, press the key combination to view the system help information.
3.5 Rear panel introduction
USB Device interface
Square wave output port.
External trigger measurement port.
Current input fuse 0.SA/ 250V.
Table 3-3 Description of the rear panel
3.6 Adjust the handle
‘To adjust the handle of the digital multimeter, hold the handle on both sides of the body and pull it
outward. Then rotate the handle to the desired position. The operation method is shown in Figure 3-5. The
multimeter can be placed as shown in Figure 3-6, and the location of the carrying as shown in Figure 3-7,