GME 236 Manuale utente

GME

User’s Manual

Rev 1.2

TEST INSTRUMENT SAFETY GUIDELINES

WARNING

An electrical shock of over 10 milliamps of current to pass through the heart will stop most human

heartbeats. Voltage as low as 35 volts dc or ac rms should be considered dangerous and hazardous

since it can produce a lethal current under certain conditions. Be sure to observe following safety

precautions:

1. Do not expose high voltage needlessly in the equipment under test. Remove housings and

covers only when necessary. Turn off equipment while making test connections in high-voltage

circuits. Discharge high-voltage capacitors after removing power.

2. If possible, familiarize yourself with the equipment being tested and the location of its high

voltage points. However, remember that high voltage may appear at unexpected points in

defective equipment.

3. Use an insulated floor material or a large, insulated floor mat to stand on, and an insulated work

surface on which to place equipment; make certain such surfaces are not damp or wet.

4. When using a probe, touch only the insulated portion. Never touch the exposed tip portion.

5. When testing ac powered equipment, remember that ac line voltage is usually present on some

power input circuits such as the on-off switch, fuses, power transformer, etc. any time the

equipment is connected to an ac outlet, even if the equipment is turned off.

Limited One-Year Warranty

GME Technology warrants to the original purchaser that this product and the component parts thereof, will be

free from defects in workmanship and materials for a period of one years from the data of purchase. GME

Technology will, without charge, repair or replace, at its’ option, defective product or component parts. Returned

product must be accompanied by proof of the purchase date in the form a sales receipt.

Term and Conditions

•The warranty period is based upon the invoice date of the original purchase by the end-user.

•Warranty only applies to defects in materials and/or workmanship, which occur during normal use.

•Warranty does not apply to those products that are damaged due to misuse, abuse, negligence or

modification.

•Warranty does not extend to any damage that occurs in shipment or due to natural phenomenon (i.e.

lightning or line surges).

•Warranty will be voided if the original serial number on the product is removed by accident or

intentionally

This warranty gives you specific rights and you may have other rights, which vary from state-to-state.

Service & Repair

The following are procedure for returning a GME product for servicing and repair. Turn around time

for repair is normally within five (5) working days excluding shipping time.

RMA Procedure

Before sending your GME product in for service, be sure to contact GME Technology first to

obtain a RMA number. If your product is still under warranty, please send in the product along with a

copy of the receipt showing the date when the product was purchased. If the warranty has already

expired, please ask for the repair cost when you contact GME Technology for the RMA number and

include a check or money order for the repair cost when you send in the product.

Please make check payable to: GME Technology

You may send your GME product to our service & repair department at:

GME Technology

ATTN: Service & Repair Department

380 S. East End Ave., #H

Pomona, CA 91766

Be sure to include a note showing your RMA number, your name, telephone number, return address,

and a description of the problem with the product.

For the most recent support information, please visit GME Technology website at

www.gmetechnology.com/support

Table of Contents

Page

Introduction …………………………………………………………………………. 1

Item Checklist ……………….…………………………………………………….... 1

Features ……………………………………………………………………………... 1

Understanding the Front Panel …………………………………………………….... 2-3

Operation and Measurement ….…………………………………………………….. 4-5

Specifications ………………….……………………………………………………... 6

GME Product Information …………………………………………………………… 7

Notes ……….………………….…………………………………………………….. 8-9

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Introduction

Thank you for purchasing the model 236 In-circuit ESR & DCR capacitor tester. This tester is

designed to measure ESR (Equivalent Series Resistance) on capacitors range from 0.47µF to 2200µF,

in or out of circuit. The ability to troubleshoot in-circuit saves valuable time, making the 236 a must

for anyone that tests or troubleshoots PCB (printed circuit boards). The 236 is microprocessor

controlled and automatically discharge capacitor under test. It features a 100 kHz output test

frequency. Using a low 15 mV peak-to-peak output test voltage, the 236 will not turn on any solid state

devices during testing for accurate test result. It also checks for low DCR (DC resistance).

Item Checklist

9Model 236 In-circuit ESR & DCR capacitor tester

9One protective rubber holster

9One User’s Manual

Features

♦In-Circuit ESR & DCR testing

♦Test capacitors range from 0.47µF to 2200 µF

♦One-handed tweezers test probe

♦Microprocessor controlled

♦Automatic discharges capacitor under test

♦25 segment LED indicators

♦AC adaptor power source or standard 9V battery operation

♦Low battery indicator

♦Ideal for on-the-bench and in-the-field testing

♦Easy to use, lightweight, and portable

Understanding the Front Panel

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1. Power ON/OFF switch

This Power ON/OFF switch is on the left side of the unit. Slide the switch upward to turn the unit

on and downward to turn the unit off.

2. Power ON/OFF LED

Power is ON when the LED lights up and power is OFF when the LED is off.

3. Battery Low LED

When the 236 is operating on a standard 9V battery and the voltage on the battery has drop down

to around 5V, this green LED will turn on indicating the voltage on the battery is low.

4. DCR LOW indicator LED

When testing under the “DCR & ESR” mode, this LED turns on when DCR low

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5. 9V AC adaptor input

The user may connect a 9V 100mA 5.5mm x 2.1mm center positive AC adaptor (not included) to

power the 236.

6. Test Mode Switch

Use this selector to choose between the two available test modes: “DCR & ESR” mode or “ESR”

mode.

7. ESR / DCR resistance LEDs

25 Segment LEDs used to indicate DCR or ESR resistance value of the capacitor under test

8. Three-Colored chart

This three-colored chart shows the typical capacitor ESR reading. Use the chart to determine

whether the capacitor under test is Good, Fair, or Bad.

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Operation and Measurement

Use the 236 to measure electrolytic capacitors in or out the circuit. Follow these instructions to

determine the ESR value of the capacitor under test. Use the Three-Colored chart to determine

whether the capacitor under test is Good, Fair, or Bad according to the ESR value shown.

Select the “ESR & DCR” or “ESR” test mode. Slide the power switch to turn on the 236. The

unit will automatically calibrate the internal circuitry. It will beep once to signal it is ready when

the calibration is done. (NOTE: DO NOT short the tweezers test probe or connect the test probe

to a capacitor before the unit beeps to signal it is ready, otherwise the unit will continue to sound

an alarm until the test probe is open or the capacitor is removed)

“ESR” Test Mode:

1. Hold the tweezers test probe across the leads of the capacitor wish to test.

2. The 236 will discharge the capacitor under test. Then it will measure the ESR of the capacitor

and indicates the value with the 25 segment LED on the front panel. It will sound one or

more times depending on the ESR of the capacitor (refer to Table I below).

Table I: Beeps reference table for "ESR" mode:

ESR Ohms Number of Beeps

0 ~ 0.5 Ωone (1)

0.5 ~ 1.0 Ωtwo (2)

1.0 ~ 3.0 Ωthree (3)

3.0 ~ 8.0 Ωfour (4)

8.0 ~ 30 Ωfive (5)

3. Use the Three-Color table on the front panel to determine the condition of the capacitor. This

table shows the typical capacitor ESR reading. Each small rectangular space has one of three

colors: GREEN = good

YELLOW = fair

RED = bad

The bottom of the table shows capacitor values from 0.47µF to 2200µF. The column of color

spaces above each capacitor value shows the typical ESR reading for such capacitor. The

ESR value of the capacitor under test is shown by one of the 25 segment LEDs. Compare this

ESR value with the Three-Color table’s typical ESR reading for your capacitor to determine

the condition of the capacitor under test. If the capacitor’s ESR range falls in the green area,

then the capacitor is good. If the capacitor’s ESR range falls in the yellow area, then the

capacitor’s condition is consider fair and is up to the test personnel to decide whether to

replace it. If the capacitor’s ESR range falls in the red area, then the capacitor is consider bad

and needs to be replaced.

On “ESR” mode, the 236 will indicate a shorted capacitor is good because it does not perform

DCR measurement under the “ESR” mode. Only in the “DCR & ESR” mode will the 236

detect shorted capacitor.

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“DCR & ESR” Test Mode:

1. Hold the tweezers test probe across the leads of the capacitor wish to test.

2. First, the 236 will discharge the capacitor under test. Then it will measure the DCR (DC

resistance). If the DCR is less than 30 ohm, the 236 will sound an alarm and turn on the

“DCR LOW” LED. The DC resistance is shown by flashing the segment LEDs and sounding

one or more times depending on the DCR value of the capacitor detected. (refer to Table II

below)

Table II. DCR Beeps and segment LED reference table for "DCR & ESR" mode:

DCR Ohms Segment LED that will flash Number of Beeps

0 ~ 0.5 Ω0.5 Ωone (1)

0.5 ~ 1.2 Ω1.2 Ωone (1)

1.2 ~ 2.5 Ω2.5 Ωtwo (2)

2.5 ~ 4.5 Ω4.5 Ωtwo (4)

4.5 ~ 10 Ω10 Ωthree (3)

10 ~ 20 Ω20 Ωthree (3)

20 ~ 30 Ω30 Ωthree (3)

3. If the DCR value measured by the 236 is greater than 30 ohms, then the 236 will measure the

ESR value and display it with the 25 segmented LED. Refer to the instruction under “ESR”

Test mode to determine the condition of the capacitor.

NOTE: Even though the 236 will automatically discharge capacitors before performing the

testing routines, large capacitor with enough voltage stored may damage the test probe.

Therefore, it is recommended that a large capacitor be discharged first before using the 236.

The 236 is essentially an AC ohm meter under the “ESR” mode. It can be used to measure low

value non-inductive resistors. It can also be used to measure small inductors and compare the

ESR value shown by the 236 to the values of known good inductors.

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Specifications

Open circuit probe voltage 15 mVp-p

Output Test Frequency 100 kHz sine wave

ESR Measurement Range 0.1 ~ 30 Ωdisplay with 25 segment LEDs

DCR Measurement Range 0.5 ~ 30 Ωdisplay with flashing LEDs

Power one standard 9V battery OR

9V AC adaptor (150mA, 5.5mmx2.1mm center

positive)

Power Requirement 10 mA typical

Dimension 5.7"(H) x 3.8"(W) x 1.5"(D)

Weight 0.8 lb

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