KEW1051/1052 Instruction Manual
INSTRUCTION MANUAL
DIGITAL MULTIMETER
KEW 1051/1052
Thank you for purchasing our Model KEW1051, KEW1052 Digital Multimeter.
This instruction manual describes the specifications and handling precaution for this Digital
Multimeter.
Before using this Digital Multimeter, thoroughly read this manual to get a clear understanding
on proper use.
Always observe the following instructions.
Failure to do so may impair the protection provided by the instrument and probes, and may
result in electrical shock or other dangers that may lead to serious injury or the loss of life.
KYORITSU is in no way liable for any damage resulting from the user’s mishandling of the
product.
For safe use of this product, the following safety symbols are used on the product:
n About This Manual
• Every effort has been made to ensure accuracy in the preparation of this manual.
However, should any errors or omissions come to the attention of the user, please contact
KYORITSU.
• The contents of this manual are subject to change without prior notice because of
improvement in performance or function.
• All rights reserved. No part of this manual may be reproduced in any from without
KYORITSU's written permission.
1
Regarding Safe Use of This Product
For safe use of this product, the following safety symbols are used on the product and manual:
WARNING
This indicates that the operator must refer to an explanation in the
instruction manual in order to avoid the risk of serious injury or
the loss of life.
CAUTION
This indicates that the operator must refer to an explanation in the
instruction manual in order to avoid the risk of injury or damage to
the product.
This indicates information that is essential for handling the instrument
or should be noted in order to familiarize yourself with the
instrument’s operating procedures and/or functions.
Note
Danger! Handle with Care
This symbol indicates that the operator must refer to an
explanation in the instruction manual in order to avoid risk of
injury or death of personnel or damage to the instrument.
Double Insulation
This symbol indicates double insulation or reinforced insulation.
Direct Current
This symbol indicates DC voltage/current.
Alternating Current
This symbol indicates AC voltage/current.
DC/AC
This symbol indicates AC and DC.
Fuse
This symbol indicates a fuse.
Battery
This symbol indicates a battery.
Ground
This symbol indicates ground (earth).
2
WARNING
n Always observe the following instructions. Failure to do so may result in
electrical shock or other dangers that may lead to serious injury or the loss of
life.
Test leads / Test leads with crocodile clip (optional accessory)
• Use the probes supplied by KYORITSU with this instrument.
• Do not use test leads/test leads with crocodile clip that have deteriorated or are defective.
Check test leads/test leads with crocodile clip continuity.
• Disconnect test leads/test leads with crocodile clip from the circuit under test before opening
the casing to replace the batteries or for any other reason.
• Disconnect test leads/test leads with crocodile clip from the circuit under test before
attaching/detaching the test leads/test leads with crocodile clip to/from the instrument.
• Disconnect test leads/test leads with crocodile clip from the instrument before opening the
casing to replace the batteries or for any other reason.
• A cap is provided on the tip of a test lead.
Use a test lead with the cap on for safety (safety standards: IEC 61010-031).
• Do not use the crocodile clip of test leads being loosen or removed conditions.
Casing
• Do not use the instrument if there is any damage to the casing or when the casing is
removed.
Fuses
• Use fuses of the specified rating when the fuse is replaced.
Operating Environment
• Do not operate the instrument in an atmosphere where any flammable or explosive gas is
present.
• Avoid using the instrument if it has been exposed to rain or moisture or if your hands are
wet.
Disassembly
• No person, except personnel from KYORITSU, is authorized to disassemble this instrument.
3
Contents
1. Overview.............................................................................................................. 5
2. Measurement Category........................................................................................ 6
3. Specifications....................................................................................................... 7
3.1 General Specifications............................................................................... 7
3.2 Accuracy.................................................................................................... 9
4. Operation........................................................................................................... 12
4.1 Precautions Before Measurement............................................................ 12
4.2 Components............................................................................................. 13
4.3 Measuring Instructions............................................................................ 17
4.3.1 AC Voltage Measurement................................................................. 17
4.3.2 DC Voltage Measurement................................................................. 17
4.3.3 Measurements with SENSOR........................................................... 18
4.3.4 Resistance Measurement................................................................... 18
4.3.5 Continuity Check.............................................................................. 19
4.3.6 Diode Test......................................................................................... 19
4.3.7 Temperature Measurement............................................................... 20
4.3.8 Current Measurement....................................................................... 21
4.3.9 Capacitor Measurement.................................................................... 22
4.3.10 Frequency Measurement.................................................................. 22
4.3.11 Function to change RMS detection to/from MEAN detection
mode (KEW1052 only)..........................................................................23
4.3.12 Function to turn the filter on/off....................................................... 23
4.3.13 AUTO HOLD Function.................................................................... 24
4.3.14 Relative and percentage calculation................................................. 24
4.3.15 MIN/MAX/AVG Function (KEW1052 only).................................. 25
4.4 Memory Function (KEW1052 only)........................................................ 26
4.5 AUTO POWER OFF Function................................................................ 27
4.6 Set-up Function........................................................................................ 28
4.7 Additional functions simply set when POWER ON................................ 32
4.8 LCD Check.............................................................................................. 32
5. User Calibration Function.................................................................................. 33
6. Battery and Fuse Replacement.......................................................................... 35
6.1 Battery Replacement................................................................................ 35
6.2 Fuse Replacement.................................................................................... 36
7. Calibration and Maintenance............................................................................. 37
8 Disposing the Product........................................................................................ 37
4
1. Overview
l Display
4-digit (LCD)
Maximum Reading: 6000
Bar graph indicator
l Supports a variety of measurement function
Measurement function
DC Voltage, AC Voltage, DC Current, AC Current, Resistance, Frequency, Temperature,
Capacitor, Continuity Check, Diode Test
Other functions
Data Hold (D•H), Auto Hold (A•H), Range Hold (R•H),
Maximum value* (MAX), Minimum value* (MIN), Average value* (AVG),
Zero Adjustment (Capacitor, Resistance), Relative values, Save to Memory*,
LCD backlight.
*: For model KEW1052 only
l Switching detection modes
Effective value (root mean square value) detection (RMS) and mean value detection (MEAN)
can be switched during AC voltage measurement (KEW1052 only).
l Low-pass filter
The low-pass filter can be switched on/off during AC voltage or AC current measurement.
lCommunication: optional communication set is required (KEW1052 only).
• Measurement data can be transferred to a PC using an optional USB communication
package.
The data can be read by certain applications to make trend graphs or can be converted
into Excel files.
• The data can also be output from an optional printer via an optional printer communication
set.
l Safety design
Complied standards: CE standards
Uses a current-input terminal shutter for preventing wrong input.
Uses high-performance UL-standard fuses.
5
2. Measurement Category
WARNING
n Measurement Category (CAT.)
The restrictions on the maximum voltage level for which the KEW1051, KEW1052 can
be used, depend on the measurement categories specified by the safety standards.
Do not apply any input level higher than maximum allowable input.
AC/DC 1000V
CAT.III
AC/DC 600V
CAT.IV
Measurement
category
CAT. I
Ⅰ
Ⅱ
CAT. II
Ⅲ
CAT.III
Ⅳ
CAT. Ⅳ
Description
Remarks
For measurements performed on circuits not
directly connected to MAINS.
For measurements performed on circuits directly
connected to the low voltage installation.
For measurements performed in the building
installation.
For measurements performed all the source of the
low-voltage installation.
Appliances, portable
equipment, ect.
Distribution board,
circuit breaker, ect.
Overhead wire,
cable systems, ect.
Internal Wiring
Entrance
Cable
CAT.IV
Distribution
Board
CAT. III CAT. II
CAT.I
Fixed Equipment,
etc.
Outlet
Equipment
Note
Radiation immunity affects the accuracy of the KEW1051, KEW1052 under the
conditions specified in IEC61326-1.
Use of this instrument is limited to domestic, commercial, and light industry
applications. If equipment generating strong electromagnetic interference is located
nearly, the instrument may malfunction.
6
3. Specifications
3.1 General Specifications
Measurement function:
DC Voltage, AC Voltage, DC Current, AC Current, Resistance,
Frequency, Temperature, Capacitor, Continuity Check, Diode Test
Other functions:
Data Hold (D•H), Auto Hold (A•H), Range Hold (R•H), Maximum
value* (MAX), Minimum value* (MIN), Average value* (AVG),
Zero Adjustment (Capacitor, Resistance), Relative values, Save to
Memory*, LCD backlight.
*: For model KEW1052 only
Measuring method:
Σ modulation
Display:
4-digit (LCD)/7-segment
Maximum Reading: 6000
Polarity Indicator: “–” Appears automatically when the polarity is
negative
Overrange Indicator: “ OL ”
Low-battery Indicator: “
” Appears when the batteries become
low
Measurement cycle: 5 times per second
(except frequency measurement : one time per second, Resistance
measurement (6MΩ/60MΩ) : 2.5 times per second, capacitor
measurement (1000μF) : max.0.14 time per second)
Bar graph display approx 25 times per second (at AC, Ω)
Operating temperature and humidity ranges:
-10 to 55ºC, 80%RH or less (no condensation)
70%RH or less at 40 to 55ºC.
Storage temperature and humidity ranges:
-30 to 70ºC, 70%RH or less (no condensation)
Temperature coefficient:
(Accuracy at 23±5ºC× 0.1)/ºC should be added.
(Temperature ranges: -10 to 18ºC and 28 to 55ºC)
Power supply:
AA-size (R6/LR6) 1.5V batteries: 4
Battery life:
Approximately 300 hours
(Operating hours of alkaline batteries when in DC voltage-mode.)
Note: The battery life varies depending on the operating conditions.
Insulation resistance :1000V DC, 100MΩ or more
7
Withstand voltage: 6.88kVrms AC for five seconds
(across input terminals and casing)
External dimensions: Approximately 192(L)×90(W)×49(D)mm
Weight:
Approximately 560g (including batteries)
Complied standards: Safety standards
IEC61010-1, IEC61010-031
CAT.III (Max. input voltage: AC/DC1000V)
CAT.IV (Max. input voltage: AC/DC600V)
Pollution degree 2, indoor use,
2000m max. above sea level
EMC standards
IEC61326-1 Class B
Effect of radiation immunity:
In the radio-frequency electromagnetic field of 3 V/m, accuracy is
within five times the rated accuracy.
Standard accessories:Batteries : 4
Test leads: 1set (M-7220A)
Fuse (included): 440mA/1000V (M-8926), 10A/1000V (M-8927)
Instruction manual: 1
Blank cover: 1
Optional accessories:Carrying case
Test leads (1set)
Test leads with crocodile clip (1 set)
Fuse
440mA/1000V
10A/1000V
Temperature probes
M-9150
(for the main unit with test leads and
communication cable)
M-7220A
M-7234
M-8926
M-8927
M-8405, 8406, 8407, 8408
Followings are for KEW1052 only.
USB Communication setM-8241 (Software, USB adapter and
cable)
Printer communication set
M-8243 (Printer Adapter and Cable)
Printer
M-8246
AC adapter (for printer, Europe) M-8248
Thermal paper for printer (10 rolls) M-8247
8
3.2 Accuracy
Test conditions:
Temperature and humidity: 23±5ºC at 80%RH or less
Accuracy: ±(% of reading + digits)
Note: Each response time is a value to rated accuracy within selected range.
DC Voltage Measurement
Range
Resolution
600mV
6V
60V
600V
1000V
0.1mV
0.001V
0.01V
0.1V
1V
V
Accuracy
Input Resistance
10MΩ
11MΩ
0.09+2
Maximum
Input Voltage
1000V
DC
1000V
rms AC
10MΩ
0.15+2
NMRR:
60dB or more 50/60Hz±0.1%
CMRR:
120dB or more 50/60Hz (Rs=1kΩ)
Response time:1 sec max.
AC Voltage Measurement
AC Coupling:
Range
600mV
6V
60V
600V
1000V
V
RMS value detection, sine wave
MEAN value detection and RMS value calibration (KEW1052 only)
Resolution
0.1mV
0.001V
0.01V
0.1V
1V
Accuracy
50/60Hz 40Hz to 500Hz 500Hz to 1kHz
0.5+5
1.5+5
1+5
-
Input
Impedance
10MΩ, <200pF
11MΩ, <50pF
10MΩ, <50pF
Maximum
Input
Voltage
1000V
rms AC
1000V
DC
Accuracy: At 5 to 100% of range and 1000V range is 200 to 1000V.
less than 1500V peak
For non-sinusoidal waveforms, add ±(2% + 2% of full scale), for Crest factor<3.
CMRR: 60dB or more DC to 60Hz (Rs=1kΩ)
4 counts or less is corrected to 0, Response time: 2 sec max.
DC Current Measurement
Range
Resolution
600μA
6000μA
60mA
440mA
6A
10A
0.1μA
1μA
0.01mA
0.1mA
0.001A
0.01A
A
Accuracy
Voltage Drop
< 0.12mV/μA
0.2+2
< 3.3mV/mA
0.5+5
< 0.1V/A
Response time: 1 sec max.
9
Maximum
Input Current
440mA Protected by
a 440mA/1000V fuse.
10A Protected by
a 10A/1000V fuse.
AC Current Measurement [RMS]
Range
600μA
6000μA
60mA
440mA
6A
10A
Resolution
0.1μA
1μA
0.01mA
0.1mA
0.001A
0.01A
A
RMS value detection, sine wave
Accuracy
50/60Hz
40Hz to 1kHz
Voltage
Drop
Maximum
Input Current
< 0.12mV/μA
0.75+5
1.5+5
< 3.3mV/mA
< 0.1V/A
440mA Protected by a
440mA/1000V fuse.
10A Protected by a
10A/1000V fuse.
Accuracy: At 5 to 100% of range, 10A range is 2 to 10A and 440mA range is 30 to 440mA.
For non-sinusoidal waveforms, add ±(2% + 2% of full scale), for Crest factor<3.
4 counts or less is corrected to 0, Response time: 3 sec max.
Resistance Measurement Ω
Range
Resolution
600Ω
6kΩ
60kΩ
600kΩ
6MΩ
0.1Ω
0.001kΩ
0.01kΩ
0.1kΩ
0.001MΩ
60MΩ
0.01MΩ
Accuracy
0.4+1
0.5+1
1+2 (~40MΩ)
2+2 (40~60MΩ)
Maximum
Measuring
Current
< 1.2mA
<110μA
<13μA
<1.3μA
Open-loop
Voltage
< 3.5V
< 1.3V
Input
Protective
Voltage
1000V
rms
<130nA
Accuracy is specified after zero adjustment at 600Ω to 6kΩ (Resistance)
Response time: 2 sec max. at 600Ω to 600kΩ, 10 sec max. at 6M to 60MΩ
Continuity Check
Range
Resolution
Range of Operation
600Ω
0.1Ω
The buzzer turns on
for resistances lower
than 50±30Ω.
Measuring
Current
Approx.
<1.2mA
Open-loop Input Protective
Voltage
Voltage
<3.5V
1000V rms
Diode Test
Range
Resolution
Accuracy
2V
0.001V
1+2
Measuring Current
(Vf=0.6V)
Approx. 0.5mA
10
Open-loop
Voltage
<3.5V
Input Protective
Voltage
1000V rms
Temperature Measurement TEMP
Range
-50 ~ 600°C
-58~ 999.9°F
-58~ 1112°F
Resolution
Accuracy
0.1°C
0.1°F
1°F
2+2°C
2+3.6°F
2+3°F
Input Protective
Voltage
1000V rms
Use optional Temperature Probe: Thermocouple Type K
Capacitor Measurement
Range
Resolution
Accuracy
10nF
100nF
1μF
10μF
100μF
1000μF
0.01nF
0.1nF
0.001μF
0.01μF
0.1μF
1μF
2+10
2+5
Input Protective
Voltage
1000V rms
3+5
Accuracy is specified after zero adjustment at 10n to 1μF (Capacitance).
Frequency Measurement Hz
AC Coupling, Maximum Reading 9999
Range
Resolution
Accuracy
10.00 to 99.99Hz
90.0 to 999.9Hz
0.900 to 9.999kHz
9.00 to 99.99kHz
0.01Hz
0.1Hz
0.001kHz
0.01kHz
0.02+1
Input Voltage
0.2 to 600Vrms
11
0.4 to 600Vrms
0.8 to 100Vrms
4. Operation
4.1 Precautions Before Measurement
nExamining Items Contained in the Package
After opening the package, be sure to examine the product as instructed below before use.
Should the delivered product be the wrong model, lack any item, or show any flaw in its
appearance, contact the vendor from which you purchased the product.
nPrecautions of Operation and Storage
CAUTION
• Insert the batteries in the instrument by referring to “6.1 Battery Replacement.”
• A Blank cover is provided on the upper part of back casing.
Don’t remove the Blank cover except when the USB adapter or Printer adapter is
connected (KEW1052 only).
• Do not use the instrument near noise-emitting equipment or
where there may be a sudden change of temperature. Otherwise, the instrument may
give an unstable reading or errors.
Removal of Dirt
Do not wipe the instrument using any solvent (chemicals) such as benzine or paint
thinner, as this may damage or discolor the front panel.
Use a dry cloth to clean the instrument.
Storage Conditions
• Do not leave the instrument exposed to direct sunlight or in a hot and humid location
such as the inside of a vehicle, for any prolonged length of time.
• If the instrument will not be used for a prolonged period, remove the batteries.
12
4.2 Components
n Panel Description
nTest leads
Caps of Testing leads
Display (LCD)
SHIFT key
RANGE key
HOLD (SAVE) key
LIGHT (READ) key
SELECT (PRINT) key
REL /% key
MIN/MAX(LOG) Key
(KEW1052 only) MEMORY Key
(KEW1052 only)
Function switch
Input terminal block
Red
Black
With:
1000V10A CAT. /600V 10A CAT.
Without: 1000V10A CAT. /600V 10A CAT.
Actions indicated in parenthesis are available at Memory Function (KEW1052 only).
n Test leads with crocodile clip(optional accessory)
Red
Black
Cable
Crocodile clip
13
1) Function switch
Turns off the power or select the measurement mode (function).
OFF
Turns off the power
V
Ω
AC voltage (V) measurement
Capacitor measurement
V
/
Resistance measurement
DC voltage (V) measurement
DC/AC voltage (mV) measurement
mV
(SENSOR mode)
Continuity Check
Diode Test
TEMP
μA
mA
A
Temperature measurement
DC/AC current measurement
2) SELECT key
Pressing this key in each measurement modes (function) described above selects other
measurement modes (function).
V
/
Frequency measurement
mV
AC voltage (mV) measurement
(AC SENSOR measurement in the SENSOR mode)
Diode Test
μA/mA/A
AC current measurement
3) RANGE key
Allows the operator to select the measuring range.
Fixed ranges
: The display shows the “ R•H ” symbol.
The range increases every time this key is pressed.
AUTO range
: The display shows the “ AUTO ” symbol.
To return to the auto-ranging mode, hold down RANGE key for
more than one second.
4) HOLD key
Selects between the DATA HOLD and AUTO HOLD functions.
To cancel functions, press this key once again.
DATA HOLD: Holds the display readings.
The display shows the “ D•H ” symbol.
AUTO HOLD: Holds the measured value when the test leads are handled.
The display shows the “ A•H ” symbol.
14
5) LIGHT key
Press this key once to turn on the LCD backlight for approximately one minute.
The LCD backlight is lit for approximately one minute.
(To postpone turned on time, press this key once again.)
To cancel the function, hold down this key for more than one second.
6) REL ∆ / % key
The instrument can calculate relative values or differences, and percentage values from the
reference measurement values.
1 : Relative Calculation
The display shows the “ ” symbol.
The sub-display shows the reference value.
2 : Percentage Calculation
The display shows the “ ”, “ % ” symbol.
The sub-display shows the reference value.
7) MIN/MAX key (KEW1052 only)
Displays the minimum value (MIN), maximum value (MAX) and average value (AVG)
during measurement.
Pressing this key starts recording and at the same time the display shows MIN/MAX/AVG to
release AUTO POWER OFF.
8) MEMORY key (KEW1052 only)
Data can be stored in internal memory using this key.
Used when outputting to printer with the optional adapter and cable.
9) SHIFT key
While this key is pressed, “Shift” appears on the display.
Then pressing the following keys enables the following settings.
LIGHT key
SHIFT +
Set-up function
RANGE key
Change to [RMS] mode (KEW1052 only)
REL key
Change to [MEAN] mode (KEW1052 only)
HOLD key
Turn filter on/off
SELECT key
Switch to the SENSOR mode at the mV function
15
■ Display (LCD) Description
Symbol and Unit
-
⊿
R・H
AUTO
AUTO OFF
RMS
Filter
Shift
nF、μF
mV, V
μA, mA, A
Ω, kΩ, MΩ
℃
Hz, kHz
%
mV (Sub-display)
s (Sub-display)
SENSOR
lx
(sub-display)
(sub-display)
(sub-display)
OL
6
Description
Appears when in DC-mode measurement
Appears when in AC-mode measurement
Appears when the polarity is negative
Appears when in diode test
Appears when in continuity check
Relative calculation indicator
Fixed ranges indicator
AUTO range indicator
DATA HOLD indicator
AUTO HOLD indicator
Lit when in MIN/MAX/AVG-mode (KEW1052 only)
Auto power off indicator
Appears in RMS mode
Appears while filter is on
Appears when the SHIFT key is pressed
Unit for capasitance measurement
Unit for voltage measurement
Unit for current measurement
Unit for resistance measurement
Unit for temperature measurement
Unit for frequency measurement
Unit for percentage calculation
Unit for SENSOR-mode measurement (Input voltage)
Unit for recording time when in MIN/MAX/AVG-mode (KEW1052
only)
Appears in Memory mode (KEW1052 only)
Appears when in SENSOR mode measurement.
Unit can be selected at the SENSOR mode only.
Recording time indicator when in MIN/MAX/AVG-mode.
(KEW1052 only)
number of saved data indicator. (KEW1052 only)
Reference value indicator when relative calculation.
Input voltage value indicator from SENSOR in SENSOR-mode
measurement.
Appears when in DC SENSOR mode measurement
Appears when in AC SENSOR mode measurement
Overrange indicator
Appears when the batteries become low
Bar graph indicator, Range indicator
16
4.3 Measuring Instructions
WARNING
To avoid damage to instrument or equipment
• Before starting measurement, make sure that the position of function switch and the input
terminals for connecting the test leads are appropriate for the desired mode of measurement.
• Temporarily remove the test leads from the device under test before operating the function
switch.
• Verify proper operation on a known source before use or taking action as a result of the
indication of the instrument.
Test leads here include a test leads with crocodile clip (optional accessory).
4.3.1 AC Voltage Measurement (
V,
mV)
1)Turn the function switch to the “
V ” or “mV ” position.
2)Press the SELECT Key when selecting the "mV".
(“
” is displayed.)
3)Plug the test leads into the input terminals.
4)Connect the test leads to the circuit under test and then read the value
when it stabilizes.
4.3.2 DC Voltage Measurement (
V,
mV)
V ”or “mV” position.
1)Turn the function switch to the “
2)Plug the test leads into the input terminals.
3)Connect the test leads to the circuit under test and then read the value
when it stabilizes.
Test leads
Black
Red
Test leads
Black
Red
Note
If “ mV ”range is selected and the test leads are left open-circuited, the instrument may
give a certain reading. This dose not affect your measurement.
17
4.3.3 Measurements with SENSOR (SENSOR)
1)Turn the function switch to the “ mV ” position.
2)Get the instrument in the DC SENSOR mode with the SHIFT + SELECT
Keys. Press of the SELECT Key again to use AC SENSOR.
Input voltage will be displayed on the sub-display, and values and units
set according to “input, display and unit settings of SENSOR mode”
mentioned at clause 4.6 will be displayed on the main display.
DC SENSOR Range
AC SENSOR Range
SENSOR
3)Connect the SENSOR to the input terminal.
4)Read the value when it stabilizes.
Press the SHIFT + SELECT Keys to return to normal mV measurement.
4.3.4 Resistance Measurement (Ω)
CAUTION
To avoid damage to instrument
Turn off the power to the circuit under test before starting measurement in order to prevent any
excessive voltage from being applied to the instrument.
1)Turn the function switch to the “Ω ” position.
2)Plug the test leads into the input terminals.
3)Connect the test leads to the circuit under test and then read the value
when it stabilizes.
Test leads
Black
Red
Note
Zero adjustment
Zero adjustment is recommended for correct measurement. After executing 1), 2) above,
short the two test leads. Press the REL key for adjust. (The display shows the “0.0Ω”
value.) The value (zero adjustment) stores till turn off.
18
4.3.5 Continuity Check (
)
CAUTION
To avoid damage to instrument
Turn off the power to the circuit under test before starting measurement in order to prevent any
excessive voltage from being applied to the instrument.
1)Turn the function switch to the “ ” position.
2)Plug the test leads into the input terminals.
3)Connect the test leads to the circuit under test. If the circuit is continuous
(no more than approximately 50Ω), the buzzer sounds.
4.3.6 Diode Test (
Test leads
Black
Red
)
CAUTION
To avoid damage to instrument
Turn off the power to the circuit under test before starting measurement in order to prevent any
excessive voltage from being applied to the instrument.
• ” position.
1)Turn the function switch to the “
Press the SELECT key to select Diode test.
(The display shows the
symbol.)
2)Plug the test leads into the input terminals.
3)Connect the test leads to the diode and then read the value when it
stabilizes.
Test leads
Black
Red
<Forward-bias Diode Test>
Connect the black test lead to the cathode and the red test lead to the anode.
Silicon diodes should give a reading of approximately 0.5V and light-emitting diodes a reading
between approximately 1.5V and 2.0V.
19
<Reverse-bias Diode Test>
Connect the black test lead to the anode and the red test lead to the cathode.
Normally, the display shows the “ OL ” symbol, indicating that the diode under test is normal.
The diode is defective if the display gives a certain voltage level.
Black test
lead
Red test
lead
Red test
lead
Black test
lead
Figure 2 Reverse-bias
Diode Test
Figure 1 Forward-bias
Diode Test
4.3.7 Temperature Measurement (TEMP)
CAUTION
To avoid damage to instrument
Turn off the power to the circuit under test before starting measurement in order to prevent any
excessive voltage from being applied to the instrument.
Note
Optional Temperature probe is required for temperature measurement.
Temperature Probe: Thermocouple Type K
Model: 8405, 8406, 8407, 8408
Check the measurable range of respective probes.
1)Turn the function switch to the “ TEMP ” position.
2)Plug the measuring probe into the input terminals.
3)Contact the Temprature probe to the under test and then read the value
when it stabilizes.
20
Temprature
probe
Red
Black
Note
The default temperature read-out of the Digital Multimeters is in Celsius (°C).
To change it to Fahrenheit (°F), it is necessary to proceed as follows:
Changing the temperature unit setting to Fahrenheit
Displaying “ ºC ” only is configured at factory before shipment.
Carry out the following setting procedure to display “ ºF ”.
While pressing the SELECT, RANGE and HOLD keys simultaneously, turn the function switch
to the “ TEMP ” position. Then, upon pressing the SELECT key, the temperature unit switches
from ºC to ºF.
Once the temperature is displayed in ºF, press the SELECT key to alternately switch the
temperature units between ºF and ºC.
The conversion from Celsius to Fahrenheit is performed using the equation
Fahrenheit temperature = 1.8×Celsius temperature + 32
4.3.8 Current Measurement (µA/mA/A)
WARNING
To avoid damage to instrument or equipment
• Before starting measurement, make sure that the position of function switch and the input
terminals for connecting the test leads are appropriate for the desired mode of measurement.
• The maximum input current (limited by fuses) of the “µA” and “mA” ranges is 440 mA.
Be careful not to burn yourself
• When measuring more than 6A under exceeding 40℃ conditions, the continuous measuring
time shall be within 3 minutes, then keep disconnected for more than 10 minutes.
1)Turn the function switch to the “µA ” , “mA ” or “A ”position.
(If the magnitude of the current being measured is not known,
select the “A ”position. Make sure the current being measured
is no more than 440mA before the “µA ” or “mA ” position is
selected.)
2)Please select between DC and AC. When selecting AC, press
the SELECT key.
3)Plug the black test lead into the “ COM ” input terminal and the
red test lead into the “A ”input terminal.
If the current is in the order of mA or less, plug the red test lead
into the “µA • mA” input terminal.
4)Connect the test leads to the circuit under test and then read the
value when it stabilizes.
21
Red
Test leads
Black
Test leads
Red
Black
4.3.9 Capacitor Measurement (
)
CAUTION
To avoid damage to instrument
• Turn off the power to the circuit under test before starting measurement in order to prevent
any excessive voltage from being applied to the instrument.
• Before starting measurement, be sure to discharge the capacitor under check.
”position.
1)Turn the function switch to the “
2)Plug the test leads into the input terminals.
3)Open the test lead and press the REL key in 10nF range to adjust the
capacitance to zero. (The display shows “ 0.00 ”.)
4)Connect the test leads to the circuit under test and then read the value
when it stabilizes.
Test leads
Black
Red
Note
The value (zero adjustment) remains displayed until power-off.
4.3.10 Frequency Measurement (Hz)
CAUTION
To avoid damage to instrument
Turn off the power to the circuit under test before starting measurement in order to prevent any
excessive voltage from being applied to the instrument.
V” position.
1)Turn the function switch to the “
2)Press the SELECT key to select the range of frequency. (The
display shows the unit of frequency.)
3)Plug the test leads into the input terminals.
4)Connect the test leads to the under test and then read the
value when it stabilizes.
22
<Voltage>
Test leads
Black
Red
4.3.11 Function to change RMS detection to/from MEAN detection mode (KEW1052 only)
The instrument has a function to change RMS detection to/from MEAN detection modes.
<Change to MEAN detection mode>
1)Select the appropriate AC Voltage measurement mode (ACV, ACmV) by using the function
switch and the SELECT key.
2)Press the SHIFT key to display “Shift” on the display.
3)Then press the REL key to change to MEAN detection mode. “RMS” disappears on the
display.
<Change to RMS detection mode>
1)Select the appropriate AC Voltage measurement mode (ACV, ACmV) by using the function
switch and the SELECT key.
2)Press the SHIFT key to display “Shift” on the display.
3)Then press the RANGE key to change to RMS detection mode. “RMS” appears on the
display.
4.3.12 Function to turn the filter on/off
The instrument has a function to turn the filter on/off during AC measurement.
1)Select the appropriate AC measurement mode (ACV, ACmV, ACµA, ACmA, ACA) by using
the function switch and the SELECT key.
2)Press the SHIFT key to display “Shift” on the display.
3)Then press the HOLD key to turn the low-pass filter on.
While the filter is on, "Filter" appears on the display.
Refer to filter characteristics in the diagram below.
Third-order low-pass filter
0
Amplitude ratio [dB]
-10
-20
-30
-40
-50
-60
-70
10
100 Frequency [Hz] 1,000
4)Repeat step 2) and 3) to turn the filter off.
("Filter" disappears from the display.)
23
10,000
4.3.13 AUTO HOLD Function
The instrument can automatically retain the measured value when the test leads are handled as
described below.
1)Press the HOLD key to select Auto hold function.
(The display shows the“ A•H ” symbol.)
2)Connect the test leads to the circuit under test.
3)When the reading stabilized, the buzzer sounds.
4)Remove the test leads from the circuit under test.
5)The display shows the measured value that is retained.
You can repeat steps 2) to 4)as many times as you like as long as the display shows the “ A•
H ” symbol.
Note
• In DC/AC voltage measurement, the Auto hold function is only available for ranges greater
than the 6V range.
• This function is not available for Temperature, Capacitor and Frequency measurement.
• The Auto hold function can not be applied to unstable signals.
4.3.14 Relative and percentage calculation
The instrument can calculate relative values or difference, and percentage values from the
reference measurement values. (The range will be fixed.)
<Relative (REL) calculation>
Subtracts the reference value from the measured value to display the relative value or
difference.
1)Take a measurement to set the reference value.
2)Press the REL /% key.
(The display shows the“ ” symbol and the sub-display shows the reference value.)
3)Take another measurement.
<Percentage (%) calculation>
Calculates and display the percentage value according to the following equation:
% value =(measured value – reference value)/reference value
1)Take a measurement to set the reference value.
2)Press the REL /% key.
(The display shows the“ ” symbol and the sub-display shows the reference value.)
3)Take another measurement.
Press the REL /% key again. (The display shows the“ % ” symbol.)
24
4.3.15 MIN/MAX/AVG Function (KEW1052 only)
The minimum value (MIN), maximum value (MAX) and average value (AVG) during
measurement are shown. (The range is fixed.) The average value is shown by dividing the
integrated record data by the number of recording times.
Pressing this key starts recording and at the same time the display shows “MIN”, “MAX” and
“AVG” to release AUTO POWER OFF.
<Recording time>
The timer is activated to show the elapsed time from the start and simultaneously the
renewed time for MIN/MAX is also recorded.
The elapsed time is displayed as follows:
0 sec. to 99 min. and 59 sec.: steps of 1 sec.
100 min. or more: steps of 1 min.
Press the HOLD key to stop recording. (The display shows the “ D•H ” symbol.)
<To confirm the recording time>
For confirming the recording time, press the MIN/MAX key.
Subsequent pressing of this key repeats to display the present minimum value (MIN),
maximum value (MAX) and average value (AVG).
Press the HOLD key once again to restart recording.
To cancel the confirming mode, hold down the MAX / MIN key for one second.
(“MAX” “MIN” “AVG” symbol disappears.)
Note
• No influence is exerted on the recorded data even if the test leads are disconnected while the
recording is stopped.
• If overload is recorded, the MIN or MAX display changes to “ OL ” display, resulting in
incorrect average data.
• For widely varying signal measurement, set the appropriate range in which the MAX or
MIN does not change to “ OL ” display.
25
4.4 Memory Function (KEW1052 only)
<To save a Data in internal memory>
The instrument can save a data using with the following two types of modes.
SAVE-mode:
Saves a data for one measurement by manual operation.
LOGGING-mode: Automatically saves a data from the start of logging.
Memory capacity
SAVE-mode: 100 data
LOGGING-mode: Logging data of one time 1,600data
Number of saved data
Number of saved data is 4-digit numbers. The instrument allocates the smallest
number, between 0000 to 1599, that has not yet been used. Use the  (RANGE) key
or  (REL /%) key switches the number of saved data.
To save a Data (SAVE-mode)
1)Press the MEMORY key. (The display shows the “ MEM ”symbol.)
2)Press the SAVE (HOLD) key.
(The sub-display shows the number of saved data.)
3)Press the SAVE (HOLD) key to save the data.
Another press of the SAVE (HOLD) key saves a data for the second time measurement or
later.
4)To cancel the function, hold down the MEMORY key for one second.
(“ MEM ” symbol disappears.)
Note
HOLD data can be saved.
Hold the display and save it according to the above steps.
The number of saved data
26
To save a Data (LOGGING-mode)
1)Press the MEMORY key. (The display shows the “ MEM ”symbol.)
2)Press the LOG (MIN/MAX) key.
(The sub-display shows the logging interval (period).)
Set the value with the  (RANGE) key or  (REL /%) key.
The default setting is one second.
(The default settings can be changed. Refer to the Set-up function.)
The display shows “ FULL ” when the logging data is already saved.
When saving the new data, perform delete of data.
3)Press the LOG (MIN/MAX) key to start logging. (The “ MEM ”symbol is flashing.)
4)To cancel the function, hold down the MEMORY key for one second.
When memory capacity becomes full, the function is automatically canceled.
(“ MEM ” symbol disappears.)
Note
LOGGING-mode operation during HOLD-mode disables HOLD-mode.
To load a Data (SAVE-mode)
1)Press the MEMORY key. (The display shows the “ MEM ”symbol.)
2)Press the READ (LIGHT) key.
3)Press the SAVE (HOLD) key to select the number of saved data.
Select the number with the  (RANGE) key or  (REL /%) key.
4)To cancel the function, hold down the MEMORY key for one second.
(“ MEM ” symbol disappears.)
To load a Data (LOGGING-mode)
1)Press the MEMORY key. (The display shows the “ MEM ”symbol.)
2)Press the READ (LIGHT) key.
3)Press the LOG (MIN/MAX) key to select the number of saved data.
Select the number with the  (RANGE) key or  (REL /%) key.
4)To cancel the function, hold down the MEMORY key for one second.
(“ MEM ” symbol disappears.)
<To delete of saving data>
Delete method (SAVE-mode)
• To delete all data
1)Press the MEMORY key.
(The display shows the “ MEM ”symbol.)
2)Hold down the SAVE (HOLD) key for one second.
(The display shows the “ CLr ? ”symbol.)
3)Press the SAVE (HOLD) key.
All data is deleted.
27
• To overwrite selected data
1)Press the MEMORY key.
(The display shows the “ MEM ”symbol.)
2)Press the SAVE (HOLD) key.
(The sub-display shows the number of saved data.)
3)Use the  (RANGE) key or  (REL /%) key to select the number of saved data.
4)Press the SAVE (HOLD) key to save (over write) the data.
5)To cancel the function, hold down the MEMORY key for one second.
(“MEM” symbol disappears.)
Delete method (LOGGING-mode)
• To delete all data
1)Press the MEMORY key.
(The display shows the “ MEM ”symbol.)
2)Hold down the LOG (MIN/MAX) key for one second.
(The display shows the “ CLr ? ”symbol.)
3)Press the LOG (MIN/MAX) key.
All data is deleted.
LOG
MIN/MAX
4.5 AUTO POWER OFF Function
<To use the AUTO POWER OFF function>
The display shows the “ AUTO OFF ”indication.
• The instrument automatically turns off twenty minutes after the last key operation.
The instrument will beep for approximately 30 seconds to alert the operator before the
AUTO POWER OFF function takes effect.
• Pressing any key or switch while the instrument is beeping postpones the power-off time.
• Pressing any key once after the power to the instrument is automatically turned off switches
the instrument on again.
<To cancel the AUTO POWER OFF function>
1)Turn the function switch to the OFF.
2)With pressing the HOLD key, turn the function switch to the desired position of any
measurement mode (function).
The “ AUTO OFF ” indication turns off when the function is canceled.
28
Note
Additional functions simply set when POWER ON can be used.
<To enable the AUTO POWER OFF function once again>
1)Turn the function switch to the OFF.
2)Turn the function switch to the desired position of any measurement mode (function).
The AUTO POWER OFF function is enabled again.
The display shows the “ AUTO OFF ” indication.
4.6 Set-up Function
The following settings can be made using the Set-up function:
• default setting of detection method during AC voltage measurement (KEW1052 only)
• default setting of LOGGING interval (KEW1052 only)
• sound on/off setting (beep of buzzer)
• input, display and unit settings of SENSOR mode
• reset to factory preset mode
1)Press the SHIFT key shows “Shift” on the display.
2)Press the LIGHT key changes the mode to Set-up mode,
from Set-up to AC detection method (KEW1052), beep on/off of buzzer (KEW1051).
KEW1052
KEW1051
3)Press the LIGHT key or SHIFT key changes the setting items accordingly.
4)Change values by using the ▲ (RANGE) key or ▼ (REL) key.
5)Press the HOLD key to save/finish each setting.
“SEt” appears and the display returns to the setting items.
6)Hold down the LIGHT key for more than one second to return from Set-up mode to
measurement mode.
Note
To cancel any setting, hold down the LIGHT key for more than one second, or turn off by
using the function switch.
<Default setting of detection method during AC voltage measurement> (KEW1052 only)
Set a default setting of detection methods during AC voltage measurement.
RMS or MEAN: The default setting is RMS.
29
1)Display “Ac” by using the LIGHT key or SHIFT key.
:RMS
:MEAN
HOLD
2)Select the detection method by using the ▲ (RANGE) key or ▼ (REL) key.
3)Press the HOLD key to save the setting.
4)“SEt” appears and then “Ac.”
<Default value of LOGGING interval> (KEW1052 only)
Set a default value of the saving interval during LOGGING mode.
1)Display “L.Int” by using the LIGHT key or SHIFT key.
The default setting is 1 sec.
HOLD
2)Select the saving interval by using the ▲ (RANGE) key or ▼ (REL) key.
3)Press the HOLD key to save the setting. “SEt” appears and then “L.Int.”
Settings of saving interval
1, 2, 5, 10, 30, 60, 600, 1800 sec
<Sound on/off setting>
Set the sound on/off (beep of buzzer)
Even if the user sets the sound off, it goes off at the following points.
• checking continuity
• alarm for over-input
• alarm for auto power-off
1)Pressing the LIGHT key or SHIFT key shows “bEEP” on the display.
Set on/off on the sub-display. Default is ON.
: ON
: OFF
HOLD
2)Select on/off by using the ▲ (RANGE) key or ▼ (REL) key.
3)Press the HOLD key to save the setting.
“SEt” appears and then “bEEP.”
30
<input, display and unit settings of SENSOR mode>
Settings of input voltage in the SENSOR mode at the mV function, main display and the unit
for input voltage can be made.
1)Display as follows by using the LIGHT key or SHIFT key. Then parameters can be changed
will blink.
Sub-display (Input voltage)
・numbers can be changed
・place of decimal point/ unit are fixed
Main display
・number, place of decimal point/
unit can be changed.
Press the LIGHT key to change displays in following sequence.
4th Sub-display → 3rd Sub-display → 2nd Sub-display → 1st Sub-display →
4th Main-display → 3rd Main-display → 2nd Main-display → 1st Main-display →
Main decimal point → Main unit
(Using the SHIFT key switches them in the reversed sequence.)
HOLD
2) Select each number, place of decimal point and unit by using the ▲ (RANGE) key or ▼
(REL) key.
3) Press the HOLD key to save the setting. “SEt" appears and then returns to the set-up.
With above setting, 1A is displayed when inputting 10mV.
(max input 600mV : display will be 60A)
Setting value
numbers at sub-display: 000.0~999.9, numbers at main-display: 0000 ~ 9999,
place of decimal point at main-display: XXXX, X.XXX, XX.XX, XXX.X
unit at main-display: A, mA, μA, ºC, Ω, kΩ, MΩ, Hz, kHz, μF, nF, %, lx, none, V, mV
<Reset to factory preset mode>
Reset all the settings to factory preset mode.
1)Pressing the LIGHT key or SHIFT key shows “dEF.” on the display.
HOLD
2)Press the HOLD key to reset the settings.
“donE” appears and then “dEF.”
31
4.7 Additional functions simply set when POWER ON
CAUTION
To avoid damage to instrument
When the measurement function is completed, turn the function switch back to the OFF
position to turn off.
With pressing the following keys, turn the function switch to the desired position of any
measurement mode (POWER ON-state).
This enables the following functions corresponding to the press keys.
Keys
SELECT
HOLD
HOLD + REL /%
SELECT + RANGE
Functions to be set
LCD check (Lit only while pressing the SELECT key)
Cancels the Auto power off function
Reset all calibration values to those before shipment.
Calibration function
4.8 LCD Check
The instrument can lit all segments and mark for LCD check.
(Lit only while pressing the SELECT key.)
32
5. User Calibration Function
It is recommended that the instrument be calibrated periodically.
The instrument can be calibrated.
CAUTION
To avoid electrical shock
• Only authorized engineers are allowed to calibrate the instrument using dedicated facilities.
• Connect the calibrator to the instrument with the calibrator’s test leads.
• Before carrying out calibration, read the instruction manual of the calibrator.
• Temporarily remove the test leads from the instrument before switching measurement mode
(function).
<Conditions of calibration>
Calibrator: With accuracy higher than of this instrument
Ambient Environment:
Temperature: 23±3ºC
Humidity: 55%RH or less
Leave the instrument for 30 minutes under above conditions
before carrying out calibration.
After reference valve of Calibrator stabilizes, Press the key to confirm for calibration valve.
33
Carry out calibration of ranges in accordance with Table 1.
1)Turn the function switch from the OFF position to the mV position while pressing the
SELECT and RANGE keys at the same time.
The display shows the “ CAL ” symbol then the “ PASS ” symbol.
2)Press the SELECT key. (The display shows the “ - ” symbol.)
3)Press the HOLD key twice. (The display shows the “ - - - ” symbol.)
4)Press the RANGE key. (The display shows the “ mV ” symbol.)
5)Connect the instrument to the calibrator with the test leads.
6)Set the calibrator to Input value as an input to the instrument.
7)Press the HOLD key.
8)Be sure to confirm that the function switch and input terminal are set to the desired range.
Carry out calibration of other ranges by repairing steps 6) and 7) with reference to Table 1.
9)To quit calibration, turn the function switch back to the OFF position.
Note
Calibration should be started after fixing a range with the RANGE key.
Table 1. Calibration Table
Range
Input value
Range
Input value
DC600mV
600mV
AC6V (RMS) *1
6V 60Hz
DC6V
6V
AC6V (MEAN) *2
6V 60Hz
DC60V
60V
DC600V
600V
10nF
10nF
DC1000V
1000V
100nF
100nF
DC600μA
600μA
1μF
1μF
DC6000μA
6000μA
10μF
10μF
DC60mA
60mA
DC440mA
400mA
DC6A
6A
DC10A
10A
100μF
1000μF *3
100μF
1000μF
*1 : Calibration for all ranges by RMS value detection
*2 : Calibration for all ranges by MEAN value detection. (KEW1052 only)
*3 : Press the HOLD key 20 sec later after applying an input. It takes about 8 sec(max) to get
a readings stable. (A buzzer sounds.) Further operations should not be done until readings
becomes stable.
34
6. Battery and Fuse Replacement
WARNING
Be careful not to burn yourself.
• Fuse becomes a high temperature after current measurement, it is dangerous by touching it
directly.
When fuse or batteries are replaced after current measurement, please be sure to leave the
main unit for 10 minutes for cooling.
6.1 Battery Replacement
If the batteries fall below the normal operating voltage, the “
Follow the steps below to replace the batteries with new ones.
(AA-size (R6/LR6) 1.5V batteries)
”symbol turns on.
WARNING
•Be sure to disconnect the instrument from the circuit under test and test leads before
replacing the batteries.
•Turn the function switch to OFF (turn off the power) .
• Do not operate the instrument with the casing left open.
CAUTION
• Do not mix batteries of different types or new batteries with used ones.
• Make sure the polarities of the new batteries are exactly as shown on the battery holder.
To replace the batteries:
1)Remove the screw on the back of the
casing.
2)Remove the back cover.
3)Take the batteries out of the housing.
4)Replace the batteries with new ones.
5)Close the back cover and fasten it with
the screw.
Blank cover
(For USB adapter,
Printer adapter)
Battery housing
Screw hole
35
<Rear View>
Back cover removed
6.2 Fuse Replacement
If a current greater than the rated value flows when the instrument is in the currentmeasurement range, a protection fuse may blow.
If this happens, replace that fuse. The instrument contains the following types of fuses.
WARNING
• Be sure to disconnect the instrument from the circuit under test and test leads before
replacing the fuses.
• Turn the function switch to OFF (turn off the power) .
• Do not operate the instrument with the casing left open.
• In order to avoid damage to the instrument or any possible accident, use fuses of the
specified rating.
Fuse rating: F1 M-8926 (440mA/1000V, SIBA GmbH & Co. KG, 50 210 06.0.44)
F2 M-8927(10A/1000V, SIBA GmbH & Co. KG, 50 199 06.10)
High breaking capacity type
To replace the fuse:
1)Remove the screw on the back of the casing.
2)Remove the back cover.
3)Remove the blown fuse from the fuse holder.
4)Install a new fuse in the holder.
(Make sure the fuse rating.)
5)Close the back cover and fasten it with the screw.
F1:
(440mA/1000V)
F2:
(10A/1000V)
Screw hole
<Rear View>
Back cover removed
36
7. Calibration and Maintenance
Calibration Cycle
It is recommended that the instrument be calibrated once every year.
(SEE ALSO: User Calibration Function)
Contacts of Services
Please contact the sales representative from which you purchased the instrument.
8 Disposing the Product
Waste Electrical and Electronic Equipment (WEEE), Directive 2002/96/EC
This Product complies with the WEEE Directive (2002/96/EC) marking requirement.
The affixed product label (see below) indicates that you must not discard this electrical/
electronic product in domestic household waste.
Product Category
With reference to the equipment types in the WEEE directive Annex 1, this product is
classified as a “Monitoring and Control instrumentation” product.
37
DISTRIBUTOR
Kyoritsu reserves the rights to change specifications or designs described in this
manual without notice and without obligations.
11-10
92-2006B
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