Wavetek CT-238 User Manual [en, de, fr]

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TM

Operator’s Manual

CT-238

AC/DC Current Probe

•Bedienungsanleitung

•Manuel d’Utilisation

Accessory

WARRANTY

The CT238 Current Clamp is 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

International Electrical Symbols

Caution! Refer to this manual before using the probe.

Probe is protected by Reinforced or Double Insulation.

CONTENTS

	Warranty Statement	Page 1
1	INTRODUCTION	Page 2
2	SPECIFICATIONS
2.1	Electrical Data	Page 3
2.2	General Data	Page 3
3	OPERATING INSTRUCTIONS
3.1	Switch On	Page 3
3.2	Zero Adjustment	Page 3
3.3	Current Measurement	Page 3
4	SAFETY	Page 4
5	BATTERY REPLACEMENT	Page 4
6	FACTORY SERVICE	Page 4
7	FREQUENCY RESPONSE
	AND ACCURACY CURVES	Page 6

– 1 –

3. OPERATING INSTRUCTIONS

Refer to Fig. 1 (page 3)

3.1 Switch On

When the probe is switched on the red LED will illuminate. The LED starts flashing when the battery voltage is too low for normal operation and warns the

user that it requires changing. This procedure is 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. Connect the output lead to a multimeter.

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

– 2 –

30 hours typical

> 10kΩ and ≤ 100pF 19 mm diameter

20 mm max.

250 g.

1.5m long terminated with 4mm safety plugs.

0°C to +50°C 20°C to +85°C

9 V Alkaline battery PP3,

± 1°C)

20 A r.m.s

0 to ±30 A

500A

±1% of reading ±2mA ±1% of reading ±2mA

1kHz to 20kHz ±3% or reading ±2mA Resolution ±1mA

Typical output noise level 200µV r.m.s.

Gain variation ±0.01% of reading/°C Output sensitivity 100mV/A

Frequency range DC to 20 kHz di / dt following 20A/µs Response time better than 1 µs

Dielectric strength 3.7kV rms 50Hz 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

Storage temp., battery removed Power supply

NEDA 1604 or IEC6F22 Battery life

Load impedance (minimum) Conductor size

Jaw opening Weight

Output cable and connectors

2.1 Electrical data

(All accuracies stated at 23°C Nominal current In Measuring range

Overload capacity Overall DC accuracy AC accuracy, <1kHz

1. INTRODUCTION

The CT-238 current probe has been designed for use with multimeters for accurate, non-intrusive measurement of both AC, DC and complex waveform currents.

Using advanced Hall Effect technology the CT-238 can accurately measure currents with a resolution of 1mA from 5mA to 30 Amps over the frequency range of DC to 20 kHz.

These features make it a powerful tool for use in inverters, switch mode power supplies, industrial controllers and other applications requiring current measurement and/or waveform analysis.

2. SPECIFICATION

current flow is in the direction shown by the arrow on the probe.

True r.m.s. readings may be obtained by using an appropriate true r.m.s. reading

multimeter.

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 ).

BATTERY COVER SCREW (CAPTIVE)

SCHRAUBE, BATTERIEFACH

VIS, COMPARTIMENT PILE

JAWS

ZANGE

BATTERY COVER PINCE

BATTERIEFACHDECKEL

COUVERCLE, COMP.

PILE

	ZERO ADJUST
	NULLABGLEICH	PROTECTIVE BARRIER
	AJUSTAGE DU
		SCHUTZSPERRE
	ZERO
		BOUCLIER DE
	ZERO	PROTECTION
	ADJUST
	OFF	ON

ON CT238	ON/OFF SWITCH
AC/DC CURRENT PROBE
MAX CURRENT: 20A RMS	EIN/AUS SCHALTER
OUTPUT: 100mV/A

LED	BOUTON MARCHE/
	ARRET

Fig. 1

– 3 –

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: [phone]	Tel: [phone]	Tel: int + 44-1603-404824
Fax: [phone]	Fax: [phone]	Fax: int + 44-1603-
482409

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

– 4 –

.7 Frequency Response

Phase shift in degrees • Phasenverschiebung in Grad

Frequency in Hz • Frequenz in Hz • Fréquence en Hz

Frequency in Hz; Frequenz in Hz; Fréquence en Hz

rés	10	1000	20000	100000
deg	0
en
ge	-2
éphasa	-4
D
Grad;	-6
in
ng	-8
chiebu	-10	Frequency Response CT-238
vers		Frequenzgang CT-238
sen	-12	Réponse de Fréquence CT-238
ah
degrésP

;se	-14
ene
geDr	-20
•DéphasagePhase
in	-16
Sifht	-18

deLectureLecture	2,00
	1,50
de
Erreur	1,00
•Erreur
%
Ablesefehler	0,50	50mA
	0,00	5	10	15	20	25	30
Ablesefehler;							A
%	-0,50
%
•
readingReading;	-1,00		Typical Accuracy; CT-238
			Typische Genauigkeit, CT-238
Of	-1,50		Précision Typique, CT-238
of
Error
Error	-2,00
%
%

Gain in dB • Verstärkung in dB • Gain en dB

Gain in dB; Verstärkung in dB; Gain en dB

FrequencyIninHz; •Frequenz in Hzz;• FréquenceenenHzHz

10	1000	20000	100000
1
0
-1	Frequency Response CT-238
	Frequenzgang CT-238
	Réponse de Fréquence CT-238

-2

-3

Fig. 2

– 5 –