GW Instek GCP-300 Manual de usuario

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200ADC/140ARMS

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INSTRUCTION MANUAL

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200 Amp AC/DC Current Probe

GCP-300

DC‐300kHz

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TABLEOFCONTENTS

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General Safety Instructions...........................................................3

Safety Terms and Symbols............................................................4

Getting Started ...............................................................................5

Basic Operation..............................................................................7

Maintenance ......................................……………………………..…9

Specifications...............................................................................12

Replaceable Parts ........................................................................17

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General Safety Instructions:

Read the following safety instructions to avoid injury and prevent damage

to this product or any products connected to it. Use this product only as

specified.

Only qualified personnel should perform service procedures.

ToAvoidFireorPersonalInjury

ConnectandDisconnectProperly.Connect the probe output to the

measurement instrument before connecting the probe to the circuit under

test. Disconnect the probe input and the probe ground from the circuit under

test before disconnecting the probe from the measurement instrument.

ObserveAllTerminalRatings.To avoid fire or shock hazard, observe

all rating and markings on the product. Consult the instruction manual for

further ratings information before making connections to the product.

ReplaceBatteriesProperly.Replace batteries only with the proper type

and rating specified.

DoNotOperateWithoutCovers.Do not operate this product without

the covers or panels.

AvoidExposedCircuitry. Do not touch exposed connections and

components when power is present.

DoNotOperateWithSuspectedFailures.If you suspect there is

damage to this product, have it inspected by qualified service personnel.

DoNotOperateinWet/DampConditions.

DoNotOperateinanExplosiveAtmosphere.

KeepProductSurfacesCleanandDry.

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Safety Terms and Symbols:

Terms in This Manual. These terms may appear in this manual:

WARNING. Warning statements identify conditions or practices

that could result in injury or loss of life.

CAUTION. Caution statements identify conditions or practices

that could result in damage to this product or other property.

Terms on the Product. These terms may appear on the product:

DANGER indicates an injury hazard immediately accessible as you read

the marking.

WARNING indicates an injury hazard not immediately accessible as you

read the marking.

CAUTION indicates a hazard to property including the product.

Symbols on the Product. These symbols may appear on the product:

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Attention refer to operation Instructions.

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This instrument has double insulation.

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Getting Started:

The GCP-300 current probe enables a general purpose oscilloscope to

display AC and DC current signals up to 200 amps Peak(140A RMS). The

GCP-300 current probe can also make AC and DC measurements with a

multimeter by using the BNC-to-banana plug adapter.

Figure 1: shows the controls and indicators on the GCP-300 current probe.

Press Button

Battery Inside

(suggested outdoor using)

Max. 11Wire

DC Zero Offset

C Ada

tor In

Range Selection

(Power On/Off)

Output into the BNC-to-

BNC coaxial cable

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Table 1: GCP-300 controls and indicators

Control/Indicator Description

Current flow symbol. The arrow shows the probe’s

polarity convention for measuring current flowing

from positive to negative.

Zero adjustment. Rotate to adjust the probe output

to zero when there is no current present. It may also

be used to offset a DC signal component. Zeroing is

not needed for AC measurements unless your

instrument cannot isolate a DC component (if

present).

OFF/Range switch. Slide the switch from OFF to

either the 10 mV/A or 100mV/A range. When either

range is selected, the probe is turned on, and the

green battery indicator lights. If the indicator does

not light, see Battery Notes and Battery Installation

on page11.

Battery indicator. The green battery indicator lights

when the probe is turned on. For more information,

see Battery Notes and Battery Installation on

page11.

Overload indicator. The red overload indicator

lights if the measured signal is greater than the

selected range capacity. Switch the probe to 10

mV/A if possible, or remove the probe from the

circuit.

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Basic Operation:

Before using the probe, the batteries or specified power adaptor must be

installed. See the battery installation instructions on page11.

WARNING!

Do not clamp the probe onto circuits with voltages greater than 600

VAC. Personal injury or damage to the probe may result.

Always connect the GCP-300 current probe output to the instrument

before clamping onto the circuit under test.

1. First connect the current probe BNC connector to double BNC connection

cable then connect to oscilloscope input. Start by setting the oscilloscope

voltage input channel to DC volts, and the voltage sensitivity scale to 0.1

V/div.

2. Move the OFF/ Range switch to the 10 mV/A or 100 mV/A position to turn

on the probe.

(※The GCP-300 current probe has a green LED power/battery indicator.

If the LED does not light, replace the battery or use specified power

adaptor.)

3. Use the ZERO adjustment to zero or offset the probe output detection of

residual magnetic DC charges.

4. Connect the probe to the

circuit by opening the jaws

and clamping around the

conductor. See Figure 2.

NOTE:

Clamping around both

the “hot” and neutral

wires may give you a

zero reading.

(Remember to unclamp

the probe from the

conductor before

disconnecting it from

your meter or

instrument).

Figure 2. Connecting the GCP-300 current probe.

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5. Adjust the probe channel and oscilloscope’s time base as necessary to

get a clear and stable view of the signal. Set the oscilloscope input to DC

volts to see both the AC and DC currents; set the channel to AC to see

the AC current only.

The current drawn by different devices look much different than that of

others. While the RMS current can only be used in low frequency current,

the momentary peaks may be quite high. Figure 3 shows the difference

between the line current drawn by a resistive load and a motor controller.

Figure 3. Typical current waveforms

Congratulations on your purchase of the GCP-300, a multifunctional

current probe. When connecting to a digital meter, use the BNC-to-

banana adapter. Connect the black lead to the meter COM (black letters

on the meter), and the red lead to the Vinput (red letters on the meter).

To measure only AC current, set the meter to measure AC volts.

To measure DC current, set the meter to measure DC volts. Note the

current convention arrow on the probe to get the proper polarity reading.

To increase the measurement sensitivity of the GCP-300 current probe,

loop additional turns of the wire under test through the jaws. See Figure

4. The sensitivity of the GCP-300 current probe is multiplied times the

number of loops in the jaws. For example: 10 mV/A X 4 turns = 40 mV/A.

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Figure 4: Increasing the sensitivity

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Maintenance:

Use the information in this section to properly maintain the operation of

your GCP-300 AC/DC Current Probe.

1. Notes on Battery and Power Converter:

The GCP-300 current probe uses a single square 9 V battery. This machine

is a high power product. Please use the specified alkaline battery.

As the battery in the GCP-300 current probe is drained, significant gain

errors may occur. The green LED will continue to light until a low battery

voltage of 6.5 V is reached.

If probe gain errors are detected, replace the battery with a fresh one.

As an alternative, an AC power converter can be used to avoid gain error

due to poor battery durability. Switch to a square 9V battery only when there

is no AC power supply available outdoors.

When using an AC power converter for an extended time, we suggest you

remove the battery from the compartment. This is because heating will

result in battery leakage, and battery electrolyte will rust the circuit board,

thus creating major damage. Furthermore, batteries are high pollution

products and therefore by reducing their usage, we will in turn protect the

environment.

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