METREL MD 9220 User manual
METREL MD 9220
True RMS AC/DC Auto Check Digital Clamp Meter
MD 9220
User Manual
Bedienungsanleitung
Version 1.0, Code no. 20 751 289
2
Distributor:
METREL d.d.
Ljubljanska cesta 77
1354 Horjul
Slovenia
web site: 1Hhttp://www.metrel.si/
Metrel GmbH
Mess und Prüftechnik
Orchideenstrasse 24
90542 Eckental -Brand
Germany
Internet: 4Hhttp://www.metrel.de/
Metrel UK
Test & Measurement
Unit 1, Hopton House,
Ripley Drive,
Normanton Industrial Estate,
Normanton,
West Yorkshire
WF6 1QT
Great Britain
Internet: 6Hhttp://www.metrel.co.uk/
© 2007 METREL
Mark on your equipment certifies that this equipment meets the requirements of the EC
(European Community) regulations concerning safety and electromagnetic compatibility.
No part of this publication may be reproduced or utilized in any form or by any means
without permission in writing from METREL.
MD 9220 True RMS AC/DC Clamp Meter Table of contents/Inhalt
3
Table of contents/ Inhalt
English
7H1 Safety ...........................................................................................................................21H4
8H2 Cenelec Directives........................................................................................................22H6
9H3 Product Description ......................................................................................................23H7
10H4 Operation.....................................................................................................................24H8
11H5 Maintenance ...............................................................................................................25H15
12H6 Specification ...............................................................................................................26H16
13HLIMITED WARRANTY ...................................................................................................27H20
Deutsch
14H1 Sicherheit....................................................................................................................28H21
15H2 Cenelec-Richtlinien.....................................................................................................29H23
16H3 Produktbeschreibung..................................................................................................30H24
17H4 Betrieb .......................................................................................................................31H25
18H5 Wartung ......................................................................................................................32H32
19H6 Technische Daten.......................................................................................................33H33
20HEINGESCHRÄNKTE GARANTIE ..................................................................................34H37
MD 9220 True RMS AC/DC Clamp Meter Safety
4
1 Safety
This manual contains information and warnings that must be followed for operating the
instrument safely and maintaining the instrument in a safe operating condition. If the
instrument is used in a manner not specified by the manufacturer, the protection
provided by the instrument may be impaired.
The meter meets the requirements for double insulation to IEC61010-2-032(2002),
EN61010-2-032(2002), UL61010B-2-032(2003):
Category III 600 Volts ac and dc.
PER IEC61010 OVERVOLTAGE INSTALLATION CATEGORY
OVERVOLTAGE CATEGORY II
Equipment of OVERVOLTAGE CATEGORY II is energy-consuming equipment to be
supplied from the fixed installation.
Note – Examples include household, office, and laboratory appliances.
OVERVOLTAGE CATEGORY III
Equipment of OVERVOLTAGE CATEGORY III is equipment in fixed installations.
Note – Examples include switches in the fixed installation and some equipment for
industrial use with permanent connection to the fixed installation.
OVERVOLTAGE CATEGORY IV
Equipment of OVERVOLTAGE CATEGORY IV is for use at the origin of the installation.
Note – Examples include electricity meters and primary over-current protection
equipment.
TERMS IN THIS MANUAL
WARNING identifies conditions and actions that could result in serious injury or even
death to the user.
CAUTION identifies conditions and actions that could cause damage or malfunction in
the instrument.
WARNING
To reduce the risk of fire or electric shock, do not expose this product to rain or moisture.
The meter is intended only for indoor use.
To avoid electrical shock hazard, observe the proper safety precautions when working
with voltages above 60 VDC or 30 VAC rms. These voltage levels pose a potential
shock hazard to the user.
Keep your hands/fingers behind the hand/finger barriers (of the meter and the test leads)
that indicate the limits of safe access of the hand-held part during measurement.
Inspect test leads, connectors, and probes for damaged insulation or exposed metal
before using the instrument. If any defects are found, replace them immediately.
MD 9220 True RMS AC/DC Clamp Meter Safety
5
This Clamp-on meter is designed to apply around or remove from uninsulated
hazardous live conductors. But still, individual protective equipment must be used if
hazardous live parts in the installation where measurement is to be carried out could be
accessible.
CAUTION
Disconnect the test leads from the test points before changing meter functions.
INTERNATIONAL ELECTRICAL SYMBOLS
!Caution ! Refer to the explanation in this Manual
Caution ! Risk of electric shock
Earth (Ground)
Double Insulation or Reinforced insulation
Fuse
AC--Alternating Current
DC--Direct Current
Application around and removal from hazardous live conductors is
permitted
MD 9220 True RMS AC/DC Clamp Meter Cenelec Directives
6
2 Cenelec Directives
The instruments conform to CENELEC Low-voltage directive 73/23/EEC and
Electromagnetic compatibility directive 89/336/EEC
MD 9220 True RMS AC/DC Clamp Meter Product Description
7
3 Product Description
This user's manual uses only representative model(s) for illustrations. Please refer
specification details for function availability to each model.
1)Non-ContactEF-
Detection (NCV): antenna
position
2) Jaw marking lines for
ACA position error
indication
3) Hand/Finger Barrier to
indicate the limits of safe
access to the jaws during
current measurements
4) Push-buttons for special
functions & features
5) Input Jack for all
functions EXCEPT non-
invasive ACA current
function
6) Common (Ground
reference) Input Jack for all
functions EXCEPT non-
invasive ACA current
function
7) Slide-switch Selector to
turn the power ON/OFF
and Select a function
8) 3-5/6 digits 6000 counts
LCD display
9) Jaw trigger for opening
the transformer clamp jaws
10) Jaw center Indicators,
at where best ACA
accuracy is specified
11.)Transformer Clamp
Jaws for AC current
magnetic field pick up
MD 9220 True RMS AC/DC Clamp Meter Operation
8
4 Operation
ACA Current clamp-on function
Set the slide-switch function selector to the position. Inputs are made through the
clamp jaws for non-invasive ACA current measurements.
CAUTION (Application and removal of the Clamp-on meter)
Press the jaw trigger and clamp the jaws around only one single conductor of a circuit
for load current measurement. Make sure the jaws are completely closed, or else it will
introduce measurement errors. Enclosing more than one conductor of a circuit will result
in differential current (like identifying leakage current) measurement. Locate the
conductor(s) at the Jaws center as much as possible to get the best measuring
accuracy. For removal, press the jaw trigger and remove the jaws from the conductor(s).
Adjacent current-carrying devices such as transformers, motors and conductor wires will
affect measurement accuracy. Keep the jaws away from them as much as possible to
minimize influence.
MD 9220 True RMS AC/DC Clamp Meter Operation
9
Hi-Z DCV, ACV & Line-Level Hz functions
Set the slide-switch function selector to the position selects common impedance
(Hi-Z) voltage measurements. Input impedance is set at approximately 5MΩto minimize
loading on circuits under tests. DCV is the default function. The DC annunciator “ ”
turns on. Press SELECT button momentarily to select ACV. The AC annunciator “ ”
turns on. Press momentarily again to activate the Line-Level Hz function.
Note:
Line-Level Hz input sensitivity varies automatically with ACV range selected when Line-
Level Hz is selected. AC 6V range has the highest and AC 600V range has the lowest
sensitivity. Measuring the signal in ACV function WHILE selecting Line-Level Hz
function in that ACV range automatically sets the most appropriate sensitivity for higher
voltage applications. This can avoid electrical noises as in 110/220V line voltage
applications for example. If the reading shows zero due to insufficient signal levels,
select Line-Level Hz function BEFORE making measurements (at AC 6V range) will set
the highest sensitivity.
MD 9220 True RMS AC/DC Clamp Meter Operation
10
AutoCheckTM mode
Set the slide-switch function selector to the position. This innovative AutoCheckTM
feature automatically selects measurement function of DCV, ACV or Resistance (Ω)
based on the input via the test leads.
•With no input, the meter displays “Auto” when it is ready.
•With no voltage signal but a resistance below 6MΩis present, the meter displays
the resistance value. When below 25Ω(0.025kΩ) is present, the meter further
gives a continuity beep tone.
•When a signal above the threshold of +1.5 VDC, -1 VDC or 2 VAC up to the
rated 600V is present, the meter displays the voltage value in appropriate DC or
AC, whichever larger in peak magnitude.
•Overload-Alert Feature: When above rated 600V is present, the meter displays
“OL” with a warning beep tone for over-range indication. Disconnect the test
leads from the signal immediately to avoid hazards.
Note:
•Range-Lock Feature: When a measurement reading is being displayed in
AutoCheckTM mode, press the RANGE button momentarily 1 time can lock the
function-range it was in. The LCD annunciator “ ” turns off. Range-lock can
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