EEVBlog 121GW User Manual
USER'S MANUAL
121GW
MULTIMETER
Last Revised
11 December 2017
Last Revised: 11 December 2017 121GW User Manual
2
CONTENTS
Contact .............................................................................................................. 5
Glossary of Terms .............................................................................................. 6
Change log ......................................................................................................... 7
General .............................................................................................................. 8
FCC/IC Information ........................................................................................ 8
Information to the User ................................................................................ 8
Introduction ...................................................................................................... 9
Features .......................................................................................................... 10
Specifications .................................................................................................. 12
General ........................................................................................................ 12
Voltage Measurement ................................................................................. 14
Current Measurement ................................................................................. 15
Resistance & Capacitance Measurement .................................................... 16
Diode Measurement.................................................................................... 16
Frequency & Duty Cycle Measurement ...................................................... 17
VA Measurement ........................................................................................ 17
Temperature & Continuity .......................................................................... 18
Bluetooth Specifications .............................................................................. 19
Standards ........................................................................................................ 20
Compliance Symbols ................................................................................... 20
IEC Standards ............................................................................................... 20
ANSI Standards ............................................................................................ 20
Safety .............................................................................................................. 20
Warning ....................................................................................................... 21
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Caution ........................................................................................................ 24
Operation ........................................................................................................ 25
Measuring ....................................................................................................... 30
Voltage .............................................................................................. 30
Temperature ......................................................................................... 32
Current ......................................................................................... 34
Burden Voltage ........................................................................................ 36
Resistance ............................................................................................. 37
Continuity Testing ................................................................................ 38
Cable Break Testing ............................................................................. 39
Capacitance .......................................................................................... 40
Frequency ........................................................................................... 41
Duty Cycle ........................................................................................... 42
Period .................................................................................................. 43
Diode Measurement ............................................................................ 44
Power (VA) ................................................................... 46
Data Logging ................................................................................................ 47
Backlight ...................................................................................................... 48
Bluetooth ..................................................................................................... 48
Measurement HOLD .................................................................................... 49
Relative Measurement (REL) ....................................................................... 50
MIN/MAX/AVG ............................................................................................ 51
Setup Menu ................................................................................................. 52
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Temperature ............................................................................................ 53
Battery Voltage ........................................................................................ 53
Auto Power Off (APO) .............................................................................. 53
LCD Contrast ............................................................................................ 54
Date.......................................................................................................... 54
Logging Interval ....................................................................................... 55
Maintenance ................................................................................................... 56
Debugging .................................................................................................... 56
Cleaning and Storage ................................................................................... 56
Fuse Replacement ....................................................................................... 57
Calibration ....................................................................................................... 58
Calibration Mode ......................................................................................... 58
Zero Offset Calibration ................................................................................ 60
Full Scale GAIN Calibration .......................................................................... 61
Calibration Reference Table ............................................................................ 62
Firmware Update ............................................................................................ 63
Warranty ......................................................................................................... 64
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CONTACT
If you have a warranty claim, you can contact us at the following email address:
sales@eevblog.com
This multimeter and accessories can be purchased from:
www.eevblog.com
Community Support for the meter is provided on the EEVblog Forum:
www.eevblog.com/forum
Phone:
Ph: +61(2)86268743
Last Revised: 11 December 2017 121GW User Manual
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GLOSSARY OF TERMS
IEC
(International Electrotechnical Commission)
An organisation that publishes various international standards relating to
electrical, electronics and related technology.
ANSI
(American National Standards Institute).
Americas non-profit standards organisation that oversee the development
and use of standards in various domains.
ETL
(ETL Testing Laboratories)
The compliance certification mark of Intertek Group in Europe.
OP
(Overload Protection)
The voltage that a function of the Multimeter than withstand.
Accuracy
The closeness of a measured value to a known standard.
Low BurdenTM
Provides low burden voltage when measuring current compared with typical
multimeters, minimising impact on your in-circuit current measurements.
Last Revised: 11 December 2017 121GW User Manual
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CHANGE LOG
The following represents the changes made to the manual:
Date
Description
11/12/17
Original Release
Last Revised: 11 December 2017 121GW User Manual
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GENERAL
FCC/IC INFORMATION
This device complies with Part 15 of the FCC Rules and CAN ICES-3(A). Operation is subject to the following two conditions: (1) this device may not cause
harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operations.
INFORMATION TO THE USER
This equipment has been tested and found to comply with the limits for a
Class B digital device, pursuant to part 15 of the FCC Rules. These limits are
designed to provide reasonable protection against harmful interference in a
residential installation.
This equipment generates, uses and can radiate radio frequency energy and,
if not installed and used in accordance with the instructions, may cause
harmful interference to radio communications. However, there is no guarantee that interference will not occur in an installation.
If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the
user is encouraged to try to correct the interference by one or more of the
following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that
to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
WARNING
Any changes or modifications not expressly approved by the manufacturer
could void the user’s authority to operate the equipment.
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INTRODUCTION
Congratulations on purchasing the EEVblog 121GW multimeter. It's one of
the most feature packed small form factor meters on the market, designed to
provide maximum functionality in as little bench space as possible. It provides many unique features not found on other multimeters, like low burden
voltage measurement and display, simultaneous voltage and current (VA
power) measurement, 15 V diode test voltage, Bluetooth built-in, and Micro
SD card data logging.
You've made a wise choice buying this instead of some questionable quality
cheapie, it should return the favour with many years of safe and accurate service.
That ETL logo you see stamped on the back of the meter ensures that the meter design has been independently tested to the latest IEC/UL/EN61010-1 3rd
edition safety standard by Intertek.
With a genuine 600 V CAT III rating and proper 1000V HRC fuses and
MOV+PTC protection you can feel confident and safe that you can use this
meter on most high energy mains rated equipment.
And remember, don't turn it on, take it apart!
This meter is hackable, go for it.
Have fun.
Dave Jones
www.eevblog.com
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FEATURES
Summary
• True RMS sensing up to crest factor 10 (AD8436 chipset)
• 600 V CAT III ETL Listed Rating
• 1000 V HRC fuses
• High voltage 15V diode test mode
• Dual 50,000 count display
• Relative Mode
• 1ms Peak Capture
• MIN, MAX or AVG on all functions
• Low Burden
TM
current measurement feature
• OPEN and CLOSED continuity testing (for wire breaks)
• Temperature, Capacitance, Frequency and Duty Cycle
• Unique burden voltage measurement & display in current mode
• Simultaneous voltage and current measurement and VA calculation
• Low Z input mode eliminates ghost voltages
• Automatic touch measurement data hold
• Audible and visual incorrect input jack warning
• Closed case calibration of individual ranges
Logging Capabilities
• Bluetooth LE (Low Energy) Communication
• Data logging onto a Micro SD card (CSV format)
Mechanical
• Compact size
• Backlit display
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Software
• Android, and Windows 10 support, [iPhone, Mac, Windows Phone]
1
• Updatable Firmware (via micro SD Card)
Batteries
• RTC Battery (CR1220)
• Main Battery (4 x AA)
• Long battery life of >500 hrs
1
Under development
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SPECIFICATIONS
The following specifications are given in SI units with their accuracy notated
as ± (% of reading digits) + (number of digits) unless otherwise indicated.
GENERAL
The following table represents general specifications (at 23°C ± 5°C):
Item
Specification
Display
4 ⅘ digits 50,000 counts, dual display
Update Rate
5 times per second nominal
Operating Temperature
0°C to 50°C (32°F to 122°F)
Relative Humidity
< 75%
Altitude
Operating below 2000 m
Storage Temperature
-20°C to 50°C (-44°F to 122°F)
Temperature
Coefficient
Temperature coefficient (Nominal):
RMS Sensing
True RMS sensing (AD8436)
Ingress Protection
IP41
Pollution Degree
2
Safety
cETLus 3rd Edition, CAT III 600 V, CE Conformity,
IP41, RoHS Compliant, IEC/EN61010-1: 2010 3rd
Edition
Drop Protection
1 m
Transient Protection
6 kV 2 Ω, Pulsed Source
E.M.C.
Commercial limits compliance with EN61326-1
Bluetooth
BLE112 Class 2
Chipset
Hycon HY3131
ST ARM STM32L152D
Overload Protection
mA and µA
400 mA / 600 V DC/AC
IR 10kA HRC FAST + DIODE
A and 500mA
11 A / 1000 V DC/AC
IR 20 kA HRC FAST + DIODE
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V & Auto V
600 V DC/AC RMS PTC & MOV Protection
mV, Ohm & others
600 V DC/AC RMS PTC & MOV Protection
Low Battery Voltage
Below approx. 4.2 V
Battery Type
4 x 1.5 V AA alkaline battery
(ANSI/NEDA 15 A or IEC LR6)
Current Consumption
5 mA Typical
Battery Life
500 hours typical on Alkaline
Dimension
84 mm x 165 mm x 57 mm
(3.31" x 6.50" x 2.24")
Weight
485 g (17.1 oz.) with batteries
Accessories
Rubber Boot, Temperature probe, Test leads,
Carry Case
Optional
Purchase Accessories
Magnetic hanger
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VOLTAGE MEASUREMENT
The following section provides the specifications
Range
Resolution
Accuracy
Test Condition
DC V
502 to 500 mV
5 to 500 V
600 V
1 to 10 µV
0.1 to 10 mV
0.1 V
±0.1% + 10
±0.05% + 5
±0.1% + 10
AC V
True RMS
Crest Factor <10
50 mV
50 mV
500 mV
500 mV
5 to 500 V
5 to 500 V
600 V
600 V
1 µV
1 µV
10 µV
10 µV
0.1 to 10 mV
0.1 to 10 mV
0.1 V
0.1 V
±1.2% + 15
±2.0% + 20
±0.8% + 10
±1.5% + 10
±0.3% + 10
±1.5% + 10
±0.5% + 10
±1.5% + 10
45 to 400 Hz
0.4 to 5 kHz
45 to 400 Hz
0.4 to 5 kHz
45 to 400 Hz
0.4 to 5 kHz
45 to 400 Hz
0.4 to 5 kHz
AC V+
DC V
True RMS
5 to 500 V
600 V
0.1 to 10 mV
0.1 V
±1.0% + 10
±1.0% + 10
45 to 1000 Hz
45 to 1000 Hz
This channel has overload protection for up to 600 V.
The AC Bandwidth extends beyond 5 kHz, but the meter is only specified and
calibrated at 5 kHz. The AD8436 used specifies an additional 1% error up to
65 kHz. Higher frequency is possible with additional error above that again.
2
Using Relative Mode
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CURRENT MEASUREMENT
The following section refers to the current measurement ranges and their respective performances. The current measurement module is protected by a
440 mA/1000 V HRC Fuse and an 11 A/1000 V HRC Fuse.
Range
Resolution, Accuracy
Tested
@
Burden
Voltage3
DC A
504 to 500 µA
5 to 50 mA
0.5 to 10 A
1 to 10 nA, ±1.5%+15
0.1 to 1 µA, ±0.25%+5
10 to 1000 µA, 0.75%+15
N/A
100 µV/µA
2 mV/mA
0.03 V/A5
AC A
50 to 500 µA
5 to 50 mA
0.5 to 10 A
1 to 10 nA, ±2.0%+20
0.1 to 1 µA, ±1.0%+5
10 to 1000 µA, ±1.5%+15
45 to
1000 Hz
45 to
1000 Hz
45 to
1000 Hz
100 µV/µA
2 mV/mA
0.03 V/A5
3
The measured burden voltage is displayed on the secondary display.
4
The following mode will use the x10 amplified and may have additional
offset error that should be REL’d out before measurement.
5
The burden voltage can change with the type of fuse fitted.
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RESISTANCE & CAPACITANCE MEASUREMENT
The following section outlines the specifications for the impedance ranges
Range
Resolution
Accuracy
R Ω
50 Ω6
500 Ω
5 to 500 kΩ
5 MΩ
50 MΩ
0.001 Ω
0.01 Ω
0.1 to 0.01 kΩ
0.1 kΩ
1 kΩ
±0.5%+20
±0.3%+5
±0.2%+5
±0.3%+5
±1.2%+20
C µF
10nF to 100 µF
9999 µF
0.01 nF to 0.1 µF
1 µF
±2.5%+5
±3.0%+57
This channel has overload protection for up to 600 V.
DIODE MEASUREMENT
Range
Resolution
Accuracy
Diode V
3 V
15 V
0.001 V
1.4 mA Short Circuit
7 mA short circuit
Not specified
This channel has overload protection for up to 600 V.
A nominal 2.2 K resistor (includes PTC) is in series with the voltage source and
is what limits the test current.
6
Using Relative Mode.
7
Accuracies depend on capacitor type.
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FREQUENCY & DUTY CYCLE MEASUREMENT
Range
Resolution
Accuracy
F8
Hz
99.999 Hz to
999.99 kHz
0.001 to 10 Hz
±0.1%+3
Duty
Cycle9
%
1 to 99 %
0.1 %
±0.2% + 5 +
0.2/kHz
This channel has overload protection for up to 600 V.
This range has an apparent 99,999 counts.
VA MEASUREMENT
Specifications for the VA power measurement will be consistent with the corresponding ranges for the Voltage & Current ranges being used respectively.
Congruent with the VA resolution provided for that range.
8
Sensitivity > 2.5 V RMS
9
0.01 to 200 kHz, Pulse Width: >5 us, Sensitivity: > 2.5 V RMS
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TEMPERATURE & CONTINUITY
Range
Resolution
Accuracy
Temp
°C
-200 to 1350°C
K-Type
0.1°C
±0.5%+3°C
Continuity
30 Ω or 300 Ω
User Selectable
OPEN or CLOSED
10 mΩ
Not Specified
This channel has overload protection for up to 600 V.
External temperature measurement uses a K-Type thermocouple.
Internal temperature measurement is inside a sealed case, so will have some
thermal lag.
The continuity tester can be set for beep on CLOSED or beep on OPEN (for
wire breaks) with a user adjustable threshold level.
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BLUETOOTH SPECIFICATIONS
• The 121GW uses a BLE112-A Class 2 certified Low Energy Bluetooth
module.
• This device complies with Part 15 of the FCC Rules.
• This device complies with Industry Canada licence-exempt RSS stand-
ard(s).
• This device complies with Japan MIC certification ARIB STD-T66.
Contains Transmitter Module FCC ID: QOQBLE112
Contains Transmitter Module IC: 5123A-BGTBLE112
The Bluetooth module is in conformity with the essential requirements and
other relevant requirements of the CE RED(2014/53/EU).
The product is in conformity with the following standards and/or normative
documents.
Essential Requirement
Applicable Standards / Specifications
Safety Requirements
EN 609501:2006+A11:2009+A1:2010+A12:2011+A2:2013
EMC Requirements
EN 301 489-1 V2.1.1
EN 301 489-17 V3.1.1
Radio Spectrum
EN 300 328 V2.1.1
The BLE112 Bluetooth module is KCC certified with following certification
numbers:
• BLE112-A: KCC-CRM-BGT-BLE112-A
• BLE112-E: KCC-CRM-BGT-BLE112-E
• BLE112-N: KCC-CRM-BGT-BLE112-N
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STANDARDS
This Multimeter complies to the following standards.
COMPLIANCE SYMBOLS
The device is marked with the following symbols, these have the following
meanings:
Symbol
Definition
RCM, this is the Regulatory Compliance Mark. It indicates that
the product is compliant to required Australian Standards.
CE, this is the Conformité Européenne mark. It indicates that the
product complies with required European standards.
ETL, the listed CUS Mark. It Indicates that the product is the
mark that indicates testing by Intertek.
IEC STANDARDS
The product is Extra-Low voltage system, as per IEC 60038.
The product VAC does not supply 50 or 120 VDC.
The product is classified as IP41 as per IEC 60529 standards. Tested for IEC
60950-1 and IEC/EN61010-1: 2010 3rd Edition.
ANSI STANDARDS
Safety requirements tested as per ANSI 61010-1 and testing for hand-held
equipment as per ANSI 61010-2.
CAT III rating as per ANSI. 61010-1.
SAFETY
This manual contains information and warnings that must be followed when
operating the device. Following these instructions will protect you from damaging the device or risking your well-being. The device can only protect you
up to a point and it should not be used in situations that do not comply with
the devices ratings and the recommendations in this section.
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