Wavetek CT-235, CT-237 User Manual [en, de, fr]

Operator’s Manual

CT-235, CT-237

AC/DC Current Probes

• Bedienungsanleitung

• Manuel d’Utilisation

Accessory

WARRANTY

The CT235 and CT237 Current Clamps are warranted against any defects of material or workmanship within a period of one (1) year following the date of purchase of the multimeter by the original purchaser or original user. Any multimeter claimed to be defective during the warranty period should be returned with proof of purchase to an authorized Wavetek Meterman Service Center or to the local Wavetek Meterman dealer or distributor where your multimeter was purchased. See maintenance section for details. Any implied warranties arising out of the sale of a Wavetek Meterman multimeter, including but not limited to implied warranties of merchantability and fitness for a particular purpose, are limited in duration to the above stated one (1) year period. Wavetek Meterman shall not be liable for loss of use of the multimeter or other incidental or consequential damages, expenses, or economical loss or for any claim or claims for such damage, expenses or economical loss. Some states do not allow limitations on how long implied warranties last or the exclusion or limitation of incidental or consequential damages, so the above limitations or exclusions may not apply to you. This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.

WARNINGS AND PRECAUTION

PLEASE READ SECTION 2 – SPECIFICATION BEFORE OPERATING THE INSTRUMENT

Exceeding the maximum limits of this instrument is DANGEROUS. Exceeding these limits will expose you to physical injury or even death and will almost certainly damage your instrument. Even low-level voltages and currents are capable of causing serious injury or even death. Please do not use this or any piece ot test equipment without proper training. Individual functions and ranges have different overload limits. It is VERY IMPORTANT that you make yourself aware of these overload limits. Check the specifications of these overload limits.

OPERATING INSTRUCTIONS

CONTENTS

Warranty Statement Page 1 1 INTRODUCTION Page 1 2 SPECIFICATIONS

2.1 Electrical Data Page 2

2.2 General Data Page 2 3 OPERATING INSTRUCTIONS

3.1 Switch On Page 3

3.2 Zero Adjustment Page 3

3.3 Current Measurement Page 3 4 SAFETY Page 3 5 BATTERY REPLACEMENT Page 3 6 FACTORY SERVICE Page 4 7 FREQUENCY RESPONSE

AND ACCURACY CURVES Page 7

1. INTRODUCTION

The CT-235 and the CT-237 current probes have been designed for use with digital multimeters, recorders and other suitable equipment for accurate nonintrusive measurement of AC, DC and complex waveform currents.

– 1 –

International Electrical Symbols

Caution! Refer to this manual before using

the probe.

Probe is protected by Reinforced or Double

Insulation.

– 2 –

Using advanced Hall Effect technology the CT-237 can accurately measure currents up to 200 A r.m.s. over the frequency range of DC to 10 kHz, while the CT-235 measures currents up to 1000A DC or AC peak. These features make them powerful tools for use in inverters, switch mode power supplies, industrial controllers, automotive diagnostics and other applications requiring accurate isolated current measurement.

2. SPECIFICATIONS

2.1 Electrical data

(All accuracies stated at 23°C ± 1°C) Current ranges

CT-237 20A and 200A DC and AC r.m.s.

CT-235 200A and 1000A DC and AC peak Overload capacity 1000 % Overall accuracy

CT-237, 20A range DC ±1% of rdg ± 0.03A

20A range AC, <5kHz ±1% of rdg ± 0.03A

5kHz to 10kHz ±2% of rdg ±0.03A

CT-237, 200A range DC ±1% of rdg ± 0.3A

200A range AC, <2kHz ±1% of rdg ± 0.3A

2kHz to 5kHz: ±2% of rdg ±0,3A

5kHz to 10kHz: ±5% of rdg ±0,3A

CT-235, 200A/1000A range, DC±1% of rdg ± 0.5A

200A/1000A range, AC, <10kHz ±1% of rdg ± 0.5A Resolution

CT-237, 20A range ± 10mA

CT-237, 200A range ± 100mA

CT-235, 200A range ± 100mA

CT-235, 1000A range ± 100mA Temperature coefficient ± 0.1% of reading/°C Output sensitivity

CT-237, 20A range 10 mV/A

CT-237, 200A range 1mV/A

CT-235, 200A range 1 mV/A

CT-235, 1000A range 1 mV/A Frequency range ( -1dB) DC to 10 kHz (limited by eddy

current heating for Irms x f >400,000) Dielectric strength 3.7kV r.m.s. 50 Hz for 1 min Safety: Meets EN61010-1 Cat III 300V; EN61010-2-032

EMC: Meets EN50081-1, EN50082-1 EMC: This product complies with requirements of the following

European Community Directives: 9/336/EEC (Electromagnetic Compatibility) and 73/23/EEC (Low Voltage) as amended by 93/68/EEC (CE Marking).

2.2 General data

Operating temperature 0°C to +50°C Storage temperature with battery removed - 20°C to +85°C Power supply 9 V, Alkaline battery

PP3, NEDA 1604 or IEC6F22

Battery life 50 hours typical Load impedance (minimum) >10 kΩ and ≤100pF Conductor size

CT-237 19 mm CT-235 31 mm

Jaw opening

CT-237 20 mm max. CT-235 32 mm max.

Weight

CT-237 250 g. CT-235 295 g.

Output cable and connectors 1.5 m long terminated with 4mm safety plugs

– 3 –

3. OPERATING INSTRUCTIONS

Refer to Fig. 1 for the CT-237 and Fig. 2 for the CT-235 (pages 5 & 6).

3.1 Switch On

When the probe is switched on the red LED will illuminate. If the LED starts flashing this warns the user that the battery voltage is too low for normal operation and that it should be changed as described in section 5.

3.2 Zero Adjustment

The output zero offset voltage of the probe may change due to thermal shifts and other environmental conditions. To adjust the output voltage to zero depress the thumbwheel and rotate. Ensure that the probe is away from the current carrying conductor whilst the adjustment is made.

3.3 Current Measurement

Switch on the probe using the On - Off switch and check that the LED is lit. Select the required current range ( 20 Amp or 200 Amp for the CT-237; 200A or 1000A for the CT-235). Connect the output lead to a multimeter. Select AC millivolts to measure Alternating Current and DC millivolts for Direct Current. Autoranging meters will automatically select the correct range. If necessary adjust the probe output voltage to zero as described in section 3.2. Clamp the jaws of the probe round the conductor ensuring a good contact between the closing faces of the jaws. Observe and take measurements as required. Positive output indicates that the current flow is in the direction shown by the arrow on the probe. True r.m.s. readings can be obtained by using an appropriate true r.m.s. reading multimeter. Core eddy current heating is produced when Irms x f >400,000.

4. SAFETY

This instrument is designed to be safe under the following conditions:

- indoor use

- altitude up to 2000m

- temperature 0°C to +50°C

- maximum relative humidity 80% for temperatures up to 31°C decreasing linearly to 40% relative humidity at 50°C. Use of the probe on uninsulated conductors is limited to 300V r.m.s or d.c. and frequencies below 1kHz. Safety in its use is the responsibility of the operator who must be a suitably qualified or authorised person. Do not use the probe if any part of the probe including the lead and connector(s) appear to be damaged or if a malfunction of the instrument is suspected. When using the probe ensure that your fingers are behind the protective barrier see Fig. 1 Clean the case periodically by wiping it with a damp cloth and detergent. Do not use abrasive cleaners or solvents. Do not immerse the probe in liquids.

5. BATTERY REPLACEMENT

SAFETY WARNING: Before removing the

battery cover, make sure that the probe is

remote from any live electrical circuit.

The red LED will flash when the minimum operating voltage is approached. Refer to Fig.1. and use the following procedure. Unclamp the probe from the conductor, turn it off using the On - Off switch and disconnect the output leads from external equipment. Loosen the captive screw which secures the battery cover. Lift the cover through 30°and pull it clear of the probe body as shown in Fig 1. The battery is then accessible. Replace the battery and re-fit the battery cover and fasten the screw. Replacement with other than the specified type of battery will invalidate the warranty. Fit only Type 9 V PP3, Alkaline (MN 1604 ).

– 4 –

6. SERVICE INFORMATION

Read the warranty located at the front of this manual before requesting warranty or non-warranty repairs. For warranty repairs, any multimeter claimed to be defective can be returned to any Wavetek Meterman authorized distributor or to a Wavetek Meterman Service Center for an over-the-counter exchange for the same or like product. Non-warranty repairs should be sent to a Wavetek Meterman Service Center. Please call Wavetek Meterman or enquire at your point of purchase for the nearest location and current repair rates. All multimeters returned for warranty or non-warranty repair or for calibration should be accompanied by the following information or items: company name, customer’s name, address, telephone number, proof of purchase (warranty repairs), a brief description of the problem or the service requested, and the appropriate service charge (for non-warranty repairs). Please include the test leads with the meter. Service charges should be remitted in the form of a check, a money order, credit card with expiration date, or a purchase order made payable to Wavetek Meterman or to the specific service center. For minimum turn-around time on out-of-warranty repairs please phone in advance for service charge rates. The clamp should be shipped with transportation charges prepaid to one of the following addresses or to a service center:

in U.S.A. in Canada in Europe Wavetek Meterman Wavetek Meterman Wavetek Meterman 1420 75th Street SW 400 Britannia Rd. E.Unit #1 52 Hurricane Way Everett, WA 98203 Mississauga, ON L4Z 1X9 Norwich, NR6 6JB, U.K. Tel: 877-596-2680 Tel: (905) 890-7600 Tel: int + 44-1603-404824 Fax: 425-446-6390 Fax: (905) 890-6866 Fax: int + 44-1603482409

The instrument will be returned with the transportation charges paid by Wavetek Meterman.

BATTERY COVER SCREW (CAPTIVE)

Fig. 1

SCHRAUBE, BATTERIEFACH VIS, COMPARTIMENT PILE

JAWS ZANGE

OFF 20A 200A

CT237

PINCE

PROTECTIVE BARRIER SCHUTZSPERRE BOUCLIER DE PROTECTION

ON/OFF SWITCH EIN/AUS SCHALTER BOUTON MARCHE/ ARRET

BATTERY COVER BATTERIEFACHDECKEL COUVERCLE, COMP. PILE

ZERO ADJUST NULLABGLEICH AJUSTAGE DU ZERO

LED

ZERO

ADJUST

AC/DC CURRENT PROBE

OUTPUT: 10mV/A 1mV/A MAX CURRENT: 200A RMS

– 5 –

-3

-2,5

-2

-1,5

-1

-0,5

0,5

10 100 1000 10000

ain

; V

ers

tä

; G

200A Range

20A Range

Frequency Response CT-237

Frequenzgang CT-237

Réponse de Fréquence CT-237

Frequency in Hz; Frequenz in Hz; Fréquence en Hz

-3

-2

-1

10 100 1000 10000

ain in dB

; V

erstärku

; G

ain

Fréquence en Hz

Frequency Response CT-235

Frequenzgang CT-235

Réponse de Fréquence CT-235

Frequency in Hz

Frequenz in Hz

-10

-8

-6

-4

-2

10 100 1000 10000

;

Frequency in Hz; Frequenz in Hz; Fréquence en Hz

Frequency Response CT-237

Frequenzgang CT-237

Réponse de Fréquence CT-237

Gain in dB • Verstärkung in dB • Gain en dB

Frequency in Hz • Frequenz in Hz • Fréquence en Hz

Phase shift in degrees • Phasenverschiebung in Grad

• Déphasage en degrés

-2,00

-1,50

-1,00

-0,50

0,00

0,50

1,00

1,50

2,00

1 2

1 4

1 6

1 8

2 0

rro

r o

f R

; %

les

efe

ler; %

rre

r d

e L

Typical Accuracy CT-237 20A range

Typische Genauigkeit CT-237, 20A Bereich

Précision Typique CT-237, Calibre 20A

-3,00

-2,50

-2,00

-1,50

-1,00

-0,50

0,00

0,50

1,00

1,50

2,00

2,50

3,00

100

120

140

160

180

200

rro

r o

f R

; %

feh

r; %

récis

e L

ctu

Typical Accuracy CT-237, 200A range

Typische Genauigkeit CT-237, 200A Bereich

Précision Typique CT-237, Calibre 200A

-10

-8

-6

-4

-2

10 100 1000 10000

;

Frequency in Hz; Frequenz in Hz; Fréquence en Hz

Frequency Response CT-235

Frequenzgang CT-235

Réponse de Fréquence CT-235

-2

-1,5

-1

-0,5

0,5

1,5

100

2 0 0

3 0 0

4 0 0

5 0 0

6 0 0

7 0 0

8 0 0

9 0 0

1 0 0 0

% Error of Reading; % Ablesefehler; % Erreur de Lecture

Typical Accuracy CT-235

Typische Genauigkeit CT-235

Précision Typique CT-235

7. FREQUENCY RESPONSE AND ACCURACY CURVES

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