IPC-TM-650 EN 2022 试验方法.pdf - 第628页

6.5 Reference MIL-STD-1686 1 Electrostatic Discharge Control Program for Protection of Electrical and Electronic Parts, Assemblies and Equipment (Excluding Electrically Initiated Explosive Devices) MIL-HDBK-263 Electrost…

6.4

Test Results

Complete

ALL shaded areas.

Description

of UUT (brand, model configuration, etc.):

est Procedure Pass/Fail Criteria Value Recorded Status

Ground

Measurements (2.5.33.1) ≤5 ΩΩ[ Pass [ Fail

Transient Measurements/Pass 1 (2.5.33.2) ≤2 V peak V [ Pass [ Fail

Transient Measurements/Pass 2 (2.5.33.2) ≤2 V peak V [ Pass [ Fail

Transient Measurements/Pass 3 (2.5.33.2) ≤ 2 V peak V [ Pass [ Fail

Current Leakage Measurements (2.5.33.3) ≤1.0 µ-amp DC µ-amp DC [ Pass [ Fail

Current Leakage Measurements (2.5.33.3) ≤1.0 µ-amp ACrms µ-amp ACrms [ Pass [ Fail

Description of Test Equipment and Configuration

Equipment

Function Brand Model Calibration Date

millivoltmeter true mvAC/rms

DC millivoltmeter 60 mv DC

Ohmmeter resistances beyond 5

MΩ

Storage Oscilloscope 100 Mhz bandwidth or

faster, 1 MΩ input

vertical ampliﬁer

Constant Current Source 10 milliamps DC

Equipment

Scale Used Cal / Std Meas. Baseline Meas.

millivoltmeter

DC millivoltmeter

Ohmmeter

Storage Oscilloscope

Constant Current Source

Additional Comments:

Test

Completed by:

NAME:

DATE:

COMPANY: PHONE:

IPC-TM-650

Number

2.5.33

Subject

Measurement

of Electrical Overstress from Soldering Hand

Tools

Date

11/98

Revision

age4of5

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6.5

Reference

MIL-STD-1686

Electrostatic

Discharge Control Program for

Protection of Electrical and Electronic Parts, Assemblies and

Equipment (Excluding Electrically Initiated Explosive Devices)

MIL-HDBK-263

Electrostatic

Discharge Control Handbook

for Protection of Electrical and Electronic Parts, Assemblies

and Equipment (Excluding Electrically Initiated Explosive

Devices)

EOS/ESD-S6.0-1994

Grounding

- Recommended Practice

Standardization Documents Order Desk, 700 Robbins Avenue, Bldg. 4D, Philadelphia, PA 19111-5094

2. ESD Association, 7902 Turin Rd., Ste. 4, Rome, NY 13440-2069

IPC-TM-650

Number

2.5.33

Subject

Measurement

of Electrical Overstress from Soldering Hand

Tools

Date

11/98

Revision

age5of5

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Scope

This

test method describes the measurement of

the DC tip-to-ground resistance of an electric hand soldering/

desoldering tool designed with a grounded tip. Measurement

of tip-to-ground AC reactance is outside the scope of this test

method. Also, measurement of soft grounded or equipment

with insulated tips is outside the scope of this test method.

There are three times when ground testing should be done:

• Equipment qualification for purchase

• Incoming inspection of new or repaired equipment

• Process monitoring (periodic checks)

Determination of tip-to-ground resistance is accomplished by

using a basic ohmmeter circuit, passing a current through the

tip and its grounding circuit and measuring the resultant volt-

age drop. The values used in this test eliminate error caused

by the Seebeck (thermocouple) effect.

Warning

This

is a laboratory test procedure that may, of

necessity, expose terminals that carry line voltages. All stan-

dard laboratory safety procedures regarding the setup and

performance of tests with line voltage equipment must be

observed at all times.

Caution

This

test is performed with soldering systems at

their normal operating temperature. Test personnel must take

adequate precautionary steps to protect themselves and oth-

ers from potential burns.

Applicable Documents.

ANSI/J-STD-001

Requirements

for Soldered Electrical and

Electronic Assemblies.

IPC-TM-650

Test

Methods Manual

2.5.33 Measurement of Electrical Overstress from Solder-

ing Hand Tools

Test Specimens

Test

specimens for this procedure are

detailed in Method 2.5.33.

Equipment/Apparatus

4.1

Test

electrode per Method 2.5.33

4.2

Constant

current source capable of providing 10 milli-

amps DC

4.3

millivoltmeter capable of measuring at least 60 mv

DC and having a resolution of 1 mv DC

4.4

Resistor,

4.99Ω 1% precision

⁄

or greater (any com-

mercially available brand carbon or metal film)

4.5

Preparation of Apparatus

Connect

the apparatus as

illustrated in Figure 1. The negative electrode of the test appa-

ratus shall make a good electrical connection to the ground

reference point of the Unit Under Test (UUT). The UUT shall be

turned on and adjusted (if applicable) to achieve normal oper-

ating temperature.

Note: The plug is in the receptacle during measurements.

It’s shown unplugged in Figure 1 for clarity. Non-US power

receptacles may be different from that illustrated.

4.6 Calibration and Standardization

The

apparatus is

checked by separately placing two resistive elements across

the test apparatus’s electrodes: a shorting wire (0.0Ω) and

4.99Ω 1% precision

⁄

or greater resistor. The combination

of the current source and the measuring/indicating device will

be accurate to within ± 0.2Ω (± 4% of upper limit).

Procedure

Once

the electrodes are in position and the

test apparatus is operating, touch the HOT tip of the UUT to

the tinned area of the test electrode. Apply solder to form a

good electrical contact. Wait for the reading to stabilize, then

record the reading.

5.1

Calculation and Interpretation of Results

Even

though

the meter reads out millivolts, using 10 ma DC for

excitation current results in the displayed numbers represent-

ing the resistance in ohms without calculation, except for

decimal place shifting (i.e., a readout of 30 mv dc indicates

3.0Ω).

The reading shall be equal to or less than 5.0Ω.

6 Notes

tracking test results, record the measured values

on a copy of the form found in Method 2.5.33.

The

Institute for Interconnecting and Packaging Electronic Circuits

2215 Sanders Road • Northbrook, IL 60062

IPC-TM-650

TEST

METHODS MANUAL

Number

2.5.33.1

Subject

Measurement

of Electrical Overstress from

Soldering Hand Tools - Ground Measurements

Date

11/98

Revision

Originating Task Group

Manual Soldering Task Group (5-22c)

Material

in this Test Methods Manual was voluntarily established by Technical Committees of the IPC. This material is advisory only

and its use or adaptation is entirely voluntary. IPC disclaims all liability of any kind as to the use, application, or adaptation of this

material. Users are also wholly responsible for protecting themselves against all claims or liabilities for patent infringement.

Equipment referenced is for the convenience of the user and does not imply endorsement by the IPC.

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