EEVBlog 121GW Manuel utilisateur
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
Last Revised: 11 December 2017 121GW User Manual
3
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
Last Revised: 11 December 2017 121GW User Manual
4
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
Last Revised: 11 December 2017 121GW User Manual
5
CONTACT
If you have a warranty claim, you can contact us at the following email ad-
dress:
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
6
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
7
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
8
GENERAL
FCC/IC INFORMATION
This device complies with Part 15 of the FCC Rules and CAN ICES-3(A). Opera-
tion is subject to the following two conditions: (1) this device may not cause
harmful interference, and (2) this device must accept any interference re-
ceived, 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 guaran-
tee that interference will not occur in an installation.
If this equipment does cause harmful interference to radio or television re-
ception, 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.
Last Revised: 11 December 2017 121GW User Manual
9
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 pro-
vides 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 ser-
vice.
That ETL logo you see stamped on the back of the meter ensures that the me-
ter 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
Last Revised: 11 December 2017 121GW User Manual
10
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 BurdenTM 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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