METREL MD 9226 Instructions

METREL MD 9226

TRMS AC/DC Current Clamp Meter

TRMS AC/DC Stromzangen Messgerät

TRMS AC/DC kleščni multimeter

MD 9226

User Manual

Bedienungsanleitung

Navodilo za uporabo

Version 1.0, Code no. 20 752 585

Mark on your equipment certifies that this equipment meets the requirements of the EC
(European Community) regulations concerning safety and electromagnetic compatibility.

Distributor:

METREL d.d.

Ljubljanska cesta 77
1354 Horjul
Slovenia
e-mail: [e-mail]
web site: http://www.metrel.si/

Metrel GmbH

Mess und Prüftechnik
Orchideenstrasse 24
90542 Eckental -Brand
Germany
E-mail: [e-mail]
Internet: http://www.metrel.de/

Metrel UK Ltd.

Test & Measurement
Unit 16, 1st Qtr Business Park
Blenheim Road
Epsom
Surrey
KT19 9QN,
Great Britain
E-mail: [e-mail]
Internet: http://www.metrel.co.uk

© 2015 METREL

No part of this publication may be reproduced or utilized in any form or by any means
without permission in writing from METREL.

2

MD 9226 TRMS AC/DC Current Clamp Meter Table of contents/ Inhalt

Table of contents / Inhalt / Vsebina

English

1 SAFETY ........................................................................................................................ 4

2 CENELEC DIRECTIVES .............................................................................................. 6

3 PRODUCT DESCRIPTION .......................................................................................... 7

4 OPERATION................................................................................................................. 8

5 MAINTENANCE .......................................................................................................... 15

6 SPECIFICATIONS ...................................................................................................... 16

7 LIMITED WARRANTY ................................................................................................ 20

Deutsch

1 SICHERHEITSBESTIMMUNGEN .............................................................................. 21

2 CENELEC-RICHTLINIEN ........................................................................................... 23

3 PRODUKTBESCHREIBUNG...................................................................................... 24

4 BETRIEB .................................................................................................................... 25

5 WARTUNG ................................................................................................................. 32

6 SPEZIFIKATIONEN .................................................................................................... 34

7 EINGESCHRÄNKTE GARANTIE ............................................................................... 38

Slovensko

1 VARNOST .................................................................................................................. 39

2 EU DIREKTIVE ........................................................................................................... 41

3 OPIS IZDELKA ........................................................................................................... 42

4 DELOVANJE .............................................................................................................. 43

5 VZDRŽEVANJE .......................................................................................................... 50

6 TEHNIČNI PODATKI .................................................................................................. 51

7 GARANCIJSKA IZJAVA ............................................................................................. 55

3

MD 9226 TRMS AC/DC Current Clamp Meter Safety

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 protection rating, against the users, is double insulation per UL/IEC/EN61010­1 Ed. 3.0, IEC/EN61010-2-033 Ed. 1.0, CAN/CSA C22.2 No. 61010-1 Ed. 3.0,
IEC/EN61010-2-032 Ed. 3.0 & IEC/EN61010-031 Ed. 1.1:

Measurement Category III 600V & Category IV 300V AC & DC.

Per IEC61010-1 (2010) OVERVOLTAGE CATEGORY
OVERVOLTAGE CATEGORY ll (CAT II) is for equipment intended to be supplied from

the building wiring. It applies both to plug-connected equipment and to PERMANENTLY
CONNECTED EQUIPMENT.

OVERVOLTAGE CATEGORY lll (CAT III) is for equipment intended to form part of a
building wiring installation. Such equipment includes socket outlets, fuse panels, and
some MAINS installation control equipment.

OVERVOLTAGE CATEGORY lV (CAT IV) is for equipment installed at or near the origin
of the electrical supply to a building, between the building entrance and the main
distribution board. Such equipment may include electricity tariff meters and primary
overcurrent protection devices.

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. Before and after hazardous voltage measurements, test the voltage
function on a known source such as line voltage to determine proper meter functioning.

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. Only use the test lead
provided with the equipment or UL Listed Probe Assembly rated CAT III 600V or better.

4

MD 9226 TRMS AC/DC Current Clamp Meter Safety

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.

5

MD 9226 TRMS AC/DC Current Clamp Meter Cenelec Directives

2 CENELEC DIRECTIVES

The instruments conform to CENELEC Low-voltage directive 2006/95/EC and
Electromagnetic compatibility directive 2004/108/EC.

6

MD 9226 TRMS AC/DC Current Clamp Meter Product Description

1) Antenna area for Non­Contact EF-Detection.

2) Jaw center indicator with
DCA polarity, at where best
current accuracy is specified.

3) Rotary Selector to turn the
power ON/OFF and Select a
function.

4) 3-5/6 digits 6000 counts
numeric LCD display.

5) Additional input Jack for
Phase Rotation function only.

6) Input Jack for all functions
EXCEPT non-invasive DCA,
DC+ACA, or ACA current
functions.

7) Common (Ground
reference) Input Jack for all
functions EXCEPT non­invasive DCA, DC+ACA, or
ACA current functions.

8) Push-buttons for special
functions & features.

9) Jaw trigger for opening the
clamp jaw.

10) Hand/Finger Barrier to
indicate the limits of safe
access of the meter.

11) Clamp Jaw for DC or AC
current magnetic field pick
up.

12) Additional center
indicator for AmpTipTM Low­current function, at where
best AmpTipTM current
accuracy is specified.

3 PRODUCT DESCRIPTION

This user's manual uses only representative model(s) for illustrations. Please refer
specification details for function availability to each model.

7

MD 9226 TRMS AC/DC Current Clamp Meter Operation

4 OPERATION

WARNING: Before and after hazardous voltage measurements, test the voltage function

on a known source such as line voltage to determine proper meter functioning.

ACV, DCV, DC+ACV, Line-level Hz, & EF (NCV) functions
Inputs, other than that of EF as described below, are made through the test lead terminals
COM/+. Defaults at ACV* Function. Press SELECT button momentarily to select DCV,
DC+ACV, Line-level Hz or EF (NCV) function in sequence.

Note:
*ACV (and hence AC+DCV & Line-level Hz) function is equipped with digital low-pass

filter, and is capable of dealing with VFD (Variable Frequency Drives) signals. It also
improves ACV reading stability in noisy electrical environments.

Electric Field EF-Detection

The meter displays “EF” when it is ready. Signal strength is indicated as a series of bar­graph segments on the display together with variable beep tones.

8

MD 9226 TRMS AC/DC Current Clamp Meter Operation

 Non-Contact EF-Detection: An antenna is located along the top-right end of the

stationary clamp jaw, which detects electric field surrounds energized conductors. It
is ideal for tracing live wiring connections, locating wiring breakage and distinguishing
between live or earth connections.

 Probe-Contact EF-Detection: For more precise indication of live wires, such as

distinguishing between Live and Ground connections, use one single probe to test via
terminal COM for direct contact EF-Detection with best sensitivity.

CAUTION & WARNING for Non-Invasive (Clamp-on) Current Measurements
CAUTION

(Application and Removal of the Clamp-on Jaws) For non-invasive current measurements,
press the jaw trigger and clamp the jaws around conductor(s) of only one single pole of a
circuit for load current measurement. Make sure the jaws are completely closed, or else
it will introduce measurement errors. Enclosing conductor(s) of more than one pole of a
circuit may result in differential current (like identifying leakage current) measurement.
Align the conductor(s) to the Jaws center indicators (Regular or AmpTip™ indicators
where applicable) as much as possible to get the best measuring accuracy. For removal,
press the jaw trigger and remove the jaws from the conductor(s).

9

MD 9226 TRMS AC/DC Current Clamp Meter Operation

Adjacent current-carrying devices such as transformers, motors and conductor wires may
affect measurement accuracy. Keep the jaws away from them as much as possible to
minimize influence.

WARNING

Do not use the meter to measure currents above the rated frequency (400Hz). Circulating
currents may cause the magnetic circuits of the Jaws reach a hazardous temperature.

Non-Invasive AmpTipTM Low-Current Functions
ACA, DCA, DC+ACA & Hz

Input is made via the clamp jaws with best accuracy specified near the jaw tip area for
small conductors low-current measurements. Defaults at ACA function. Press SELECT
button momentarily to select the subject functions in sequence.

Non-Invasive Regular Current Funtions
ACA, DCA, DC+ACA & Hz

Input is made via the clamp jaws with best accuracy specified at the jaw center for regular
current measurements. Press SELECT button momentarily to select the subject functions
in sequence.

10

MD 9226 TRMS AC/DC Current Clamp Meter Operation

Ω Resistance, Continuity, & Diode functions

Inputs are made through the test lead terminals COM/+. Defaults at Ω Resistance. Press
SELECT button momentarily to select the subject functions in sequence.

11

MD 9226 TRMS AC/DC Current Clamp Meter Operation

Note

When using Diode test function, normal forward voltage drop (forward biased) for a good
silicon diode is between 0,400 V to 0,900 V. A reading higher than that indicates a leaky
diode (defective). A zero reading indicates a shorted diode (defective). An OL indicates
an open diode (defective). Reverse the test leads connections (reverse biased) across
the diode. The digital display shows OL if the diode is good. Any other readings indicate
the diode is resistive or shorted (defective).

CAUTION

Using Resistance, Continuity or Diode function in a live circuit will produce false results
and may damage the meter. In many cases, the suspected component(s) must be
disconnected from the circuit to obtain an accurate measurement reading.

Capacitance function

Inputs are made through the test lead terminals COM/+. Defaults at Capacitance.

12

MD 9226 TRMS AC/DC Current Clamp Meter Operation

CAUTION

1. Using Capacitance function in a live circuit will produce false results and may damage
the meter. In many cases the suspected component(s) must be disconnected from
the circuit to obtain an accurate measurement reading.

2. When using Capacitance function, discharge capacitor(s) before making any
measurements. Large value capacitors should be discharged through an appropriate
resistance load.

Using the Complementary Beeper feature

The Complementary Beeper feature is selected in Power-up option. Press and hold the
REC button while turning the meter on to enable. If the segments indicate a clockwise
movement, the beeper sounds a single long beep per segment cycle. If the segments
indicate a counter clockwise movement, the beeper sounds 3 short beeps per segment
cycle.

Hold

Hold feature freezes the display for later view. LCD “ ” turns on. Press the HOLD button
momentarily to toggle the hold feature.

Record mode

Press REC button momentarily to activate MAX/MIN/AVG recording mode. LCD “ ” &
“MAX MIN AVG” turn on. The meter beeps when new MAX (maximum) or MIN (minimum)

reading is updated. AVG (Average) reading is calculated over time. Press the button
momentarily to read the MAX, MIN and AVG readings in sequence. Press the button for
1 second or more to exit this mode. Auto-Power-Off is disabled automatically in this mode.

Relative-Zero (Δ ZERO) mode

Relative-Zero allows the user to offset the meter consecutive measurements with the

main display displaying reading as the reference value. LCD “Δ” turns on. Press the Δ
ZERO (HOLD) button for one second or more to toggle Relative-Zero mode. DC-Zero
mode is set instead of Relative-Zero mode, however, to only offset the non-zero DCA

residuals caused by magnetic hysteresis of the jaws as in DCA & DC+ACA functions.
Press the Δ ZERO (HOLD) button for one second or more to activate/ re-activate this
mode. Apply this mode before making any single DCA or DC+ACA measurement for best

measuring accuracy. The meter shows “dc_0” shortly to confirm activation before

continuing measurements. The beeper will sound 3 short beeps, however, to warn for null
activation if the residual is beyond a reasonable hysteresis reading of -5 to 5 DCA.

80ms PEAK-RMS mode

Press PEAK-RMS button for one second or more to toggle PEAK-RMS mode to capture
inrush current or voltage RMS values in duration as short as 80ms. LCD turns

on. Auto-Power-Off is disabled automatically in this mode.

Backlighted LCD display

Press the SELECT button for 1 second or more to toggle the LCD backlight. The backlight
will also be turned off automatically after 32 seconds to extend battery life.

13

MD 9226 TRMS AC/DC Current Clamp Meter Operation

Intelligent Auto-Power-Off (APO)

The Auto-Power-off (APO) mode turns the meter off automatically to extend battery life
after approximately 32 minutes of no specified activities, where applicable:

1) Rotary switch or push button operations.

2) Significant measuring readings of above 8.5% of ranges.

3) Non-OL readings for Resistance, Continuity or Diode function.

4) Non-zero readings for Hz function.

5) Significant movement indication as in Phase Rotation functions.

In other words, the meter will intelligently avoid entering the APO mode when it is under
normal measurements. To wake up the meter from APO, press the SELECT button
momentarily and release, or turn the rotary switch OFF and then back on. Always turn
the rotary switch to the OFF position when the meter is not in use.

14

MD 9226 TRMS AC/DC Current Clamp Meter Maintenance

5 MAINTENANCE

WARNING

To avoid electrical shock, disconnect the meter from any circuit, remove the test leads
from the input jacks and turn OFF the meter before opening the case. Do not operate with
open case.

Trouble Shooting

If the instrument fails to operate, check batteries and test leads etc., and replace as
necessary. Double check operating procedure as described in this user’s manual.

If the instrument voltage-resistance input terminal has subjected to high voltage transient
(caused by lightning or switching surge to the system under test) by accident or abnormal
conditions of operation, the protective impedance components in series might be blown
off (become high impedance) like open fuses to protect the user and the instrument. Most
measuring functions through this terminal might then be open circuit. Such components
should only be replaced by qualified technician. Refer to the LIMITED WARRANTY
section for obtaining warranty or repairing service.

Accuracy and Calibration

Accuracy is specified for a period of one year after calibration. Periodic calibration at
intervals of one year is recommended to maintain meter accuracy. Refer to the LIMITED
WARRANTY section for obtaining calibration, repairing or warranty service.

Cleaning and Storage

Periodically wipe the case with a damp cloth and mild detergent; do not use abrasives or
solvents. If the meter is not to be used for periods of longer than 60 days, remove the
batteries and store them separately.

Battery replacement

The meter uses standard 1.5V AAA Size (IEC R03) battery X 2.
Loosen the 2 captive screws from the battery cover case. Lift the battery cover case.
Replace the batteries. Replace battery cover case. Re-fasten the screws.

15

MD 9226 TRMS AC/DC Current Clamp Meter Specification

Display

3-5/6 digits 6000 counts.

Polarity

Automatic.

Update Rate

5 per second nominal.

Operating
Temperature

0 C to 40 C

Relative Humidity

Maximum relative humidity 80% for temperature up to 31 C
decreasing linearly to 50% relative humidity at 40 C.

Pollution degree

2

Storage Temperature

-20C to 60 C, < 80% R.H. (with battery removed).

Altitude

Operating below 2000 m.

Temperature
Coefficient

nominal 0.15 x (specified accuracy)/ C @(0 C – 18 C or 28
C – 40 C), or otherwise specified.

Sensing

True RMS.

Safety

Double insulation per UL/IEC/EN61010-1 Ed. 3.0,
IEC/EN61010-2-033 Ed. 1.0, CAN/CSA C22.2 No. 61010-1
Ed. 3.0, IEC/EN61010-2-032 Ed. 3.0 & IEC/EN61010-031 Ed.

1.1 to CAT III 600V and CAT IV 300 V AC & DC.

Transient Protection

6.0 kV (1.2/50 s surge).

Overload Protections

 Current & Hz functions via jaws: 600 A DC/ A AC rms at <

400 Hz.

 Voltage & 3-Phase Rotation functions via terminals: 660 V

DC / 920 V AC rms.

 Other functions via terminals: 600 V DC / V AC rms.

E.M.C.

Meets EN61326-1:2006 (EN55022, EN61000-3-2, EN61000­3-3, EN61000-4-2, EN61000-4-3, EN61000-4-4, EN61000-4­5, EN61000-4-6, EN61000-4-8, EN61000-4-11):
 DCA and DC+ACA Functions, in an RF field of 1 V/m:

Total Accuracy = Specified Accuracy + 20 digits at
around 405 MHz

 DC A and Ohm Functions, in an RF field of 1 V/m:

Total Accuracy = Specified Accuracy + 25 digits

 Other Functions, in an RF field of 3 V/m:

Total Accuracy = Specified Accuracy + 20 digits

Power Supply

1,5 V AAA Size battery X 2.

Power Consumption

13 mA

Low Battery

Below approx. 2.85V for Capacitance & Hz.
Below approx. 2.5 V for other functions.

APO Timing

Idle for 32 minutes.

APO Consumption

5 A typical.

Dimension (LxWxH)

223 x 76 x 37 mm.

Weight

234 g

Jaw opening &
Conductor diameter

35 mm

Accessories

Test lead set, User's manual, Soft carrying pouch.

6 SPECIFICATIONS

GENERAL SPECIFICATIONS

16

MD 9226 TRMS AC/DC Current Clamp Meter Specification

Optional purchase
accessories

/

Special Features

AmpTipTM low-current range; MAX/MIN/AVG Recording
mode; Display Hold; EF-Detection (NCV); Backlighted LCD;
80ms Peak-RMS mode for inrush current; Relative-Zero.

RANGE

Accuracy

600,0 V

1,0% + 5d

RANGE

Accuracy

50 Hz ~ 60 Hz

600,0 V

1,0% + 5d

RANGE

Accuracy

DC, 50 Hz ~ 60 Hz

600,0 V

1,2% + 7d

RANGE

Accuracy

600,0 , 6,000 K, 60,00 K

1,0% + 5d

RANGE

Accuracy 1)

200,0 F, 2500 F

2,0% + 4d

ELECTRICAL SPECIFICATIONS

Accuracy is ±(% reading digits + number of digits) or otherwise specified, at 23 C ± 5 C.
Maximum Crest Factor < 2.5 : 1 at full scale & < 5 : 1 at half scale or otherwise specified,
and with frequency spectrum not exceeding the specified frequency bandwidth for non­sinusoidal waveforms.

DC Voltage

Input Impedance: 10 MΩ, 100 pF nominal.

AC Voltage (with Digital Low-Pass Filter)

Input Impedance: 10 MΩ, 100 pF nominal.

DC+AC Voltage (with Digital Low-Pass Filter)

Input Impedance: 10 MΩ, 100 pF nominal.

PEAK-rms (ACV & ACA)

Response: 80 ms to > 90%.

Audible Continuity Tester

Audible Threshold: At between 10 Ω and 250 Ω.
Response time: 32ms approx.

Ohm

Open Circuit Voltage: 1.0VDC typical.

Capacitance

1)

Accuracies with film capacitor or better.

17