IPC-TM-650 EN 2022 试验方法.pdf - 第494页

6.6.1.4 Place the 0 Ω (short) calibration standard on the test head as prompted on the unit’s monitor and press Return on the unit’s keyboard or ‘‘x1’’ on the unit. 6.6.1.5 Place the 50 Ω calibration standard on the test…

Calibrations

only last 24 hours, so calibration shall be per-

formed within 24 hours of the measurement. See 6.1 for more

calibration notes.

5.2 Set up the unit to sweep the target frequency ± 0.5% of

the target.

5.3

Measure

the sample thickness with the micrometer and

insert into the test fixture. The sample must make good con-

tact with the fixture electrodes (see 6.1 concerning the proper

force to be applied). The sample must not touch the back wall

of the fixture. The sample electrode placement and thickness

measurement shall be obtained from the same area of the

sample.

5.4

Run

the test and record the average permittivity and loss

over the narrow frequency range sweep. The scanned data

may also be saved on disk. See 6.2 for comments on

expected behavior for permittivity as a function of frequency.

5.5

Repeat

5.1 through 5.4 for all desired frequencies.

5.6

Report

the average permittivity and loss at the frequen-

cies requested.

6 Notes

6.1

Correct

calibration and operation of the test equipment

is required to obtain accurate measurement of permittivity and

loss. Proper sample preparation is also very important for

obtaining useful data from this test. Calibrate the materials

analyzer in accordance with manufacturer’s instructions. An

automatic program has been developed for the HP 4291A,

which will ease calibration and setup (see 6.6).

6.2

The

permittivity should decrease slightly with increasing

frequency. If it increases greatly or decreases more than 0.2

units from approximately 20 MHz to 1.2 GHZ, reposition

(reset) the sample in the fixture and measure again (check for

debris between the electrodes; blow out with air).

6.3

Testing

at temperatures and humidities other than room

temperature may be performed with this instrument, as a spe-

cialized fixture can be placed in a temperature chamber. A

temperature chamber must be used when testing with this

fixture under conditions where condensation might contami-

nate the electrodes, as such contamination gives spurious

results.

6.4

The

pressure of the test fixture on the specimen affects

the measured permittivity and loss values, in particular for

un-metallized test specimens. Too light of pressure reduces

the area of electrode/sample contact, thus leaving air gaps,

which result in erroneous measurements. If the pressure is too

high, the sample can be reduced in thickness and the mea-

sured values would be incorrect because the thickness is

unknown. Making measurements while adjusting the force

should lead the operator to a force setting where the mea-

sured value is independent of the force applied.

6.5

The

HP 4291 Materials Analyzer and related fixtures and

calibration kits are available from Hewlett Packard, (800) 452-

4844.

6.6

Reference Program for Automatic Calibration and

Operation

This

automatic calibration and operation pro-

gram was developed for the HP 4291A and is published in

this method as a reference. Although the program listed in this

section has been tested and used, it is given here for ‘‘refer-

ence only.’’

6.6.1

Procedure Using Automatic Program

Turn

on the

analyzer with the program/calibration disk in the drive and fol-

low the user friendly calibration instructions, which appear on

the monitor. The calibration on the HP4291 lasts about 24

hours; after that, it begins to drift and provides slightly higher

values as a function of time. The calibration procedure in

6.6.1.1 through 6.6.1.10 should therefore be performed, at a

minimum, on a daily basis. During the calibration procedure,

the line traces on the monitor should be observed during each

step. Noisy or erratic traces are an indication of external inter-

ference. If noise is observed, the calibration procedure should

be aborted and rerun. Clean the electrode on the test head,

standards, and fixture connections and electrodes on a regu-

lar (weekly) basis. Blow dry.

6.6.1.1

Allow

at least 30 minutes for the unit to warm up

and stabilize.

6.6.1.2

the unit is a frequency sweeping unit, enter the

start and stop frequency (in megahertz) of the test (single fre-

quency tests use close start/stop frequencies, which should

be ± 0.5% of the target frequency).

6.6.1.3 Place

the OS (open) calibration standard on the test

head as prompted on the unit’s monitor and press Return on

the unit’s keyboard or ‘‘x1’’ on the unit.

IPC-TM-650

Number

2.5.5.9

Subject

Permittivity

and Loss Tangent, Parallel Plate,

1 MHz to 1.5 GHz

Date

11/98

Revision

age2of5

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6.6.1.4

Place

the 0Ω (short) calibration standard on the test

head as prompted on the unit’s monitor and press Return on

the unit’s keyboard or ‘‘x1’’ on the unit.

6.6.1.5

Place

the 50Ω calibration standard on the test head

as prompted on the unit’s monitor and press Return on the

unit’s keyboard or ‘‘x1’’ on the unit.

6.6.1.6 Place

the HP 16453A test fixture or equivalent on

the test head as specified in accordance with the manufactur-

er’s instructions as prompted on the unit’s monitor.

6.6.1.7 Open

the fixture gap and lock it open as prompted

on the monitor and press Return on the unit’s keyboard or

‘‘x1’’ on the unit.

6.6.1.8

Short

the fixture gap as prompted on the monitor

and press Return on the unit’s keyboard or ‘‘x1’’ on the unit.

6.6.1.9

Place

the pure PTFE specimen in the fixture in close

contact with electrodes and with the PTFE specimen not

touching the back wall of the fixture, then press Return on the

unit’s keyboard or ‘‘x1’’ on the unit. Pull out the PTFE and

recheck. Permittivity should be within ± 0.01 or ± 0.02 units.

If not, recalibrate starting at ‘‘Fixture.’’ If it is still off, redo the

calibration from beginning.

6.6.1.10

Test

the sample in accordance with Section 5.

6.6.2

The

following calibration/test program is the latest ver-

sion of what was developed for the P H4291A. Using a text

editor (no embedded coding), enter this program on a DOS-

formatted disk and name it ‘‘AUTOST.’’ Place the disk in the

unit and turn it on (If you have any improvements PLEASE for-

ward them to the IPC): The program disk will calibrate and

configure the instrument’s screen. Two windows will appear.

The top window should be permittivity (E’r) and the bottom

window should be loss tangent (δ). Both windows should be

set to the frequency range entered in 6.3.1.2. If they are not,

return to 6.3.1 and repeat the process.

100 !**** PLEASE SET PTFE THICKNESS ON LINE 1610 AND

2600 ****

110 !**** PLEASE SET PTFE PERMITTIVITY ON LINE 2580

****

120 !**** PLEASE SET PTFE LOSS TANGENT ON LINE 2590

****

130 !****

200 !**** SAVE THIS PROGRAM ON A DOS FORMATTED

210 !**** DISK USING A TEXT EDITOR (LINES 100-5000

220 !**** NAME THE PROGRAM ‘‘AUTOST’’ WITH NO

EXTENSION

230 !**** PLACE DISK IN UNITS DRIVE AND TURN UNIT ON

240 !**** PROGRAM WILL AUTOMATICALLY RUN. TO

RESET

250 !**** UNIT FOR NEW FREQUENCY RANGE PRESS

‘‘STOP’’

260 !**** ON UNITS FACE THEN ‘‘START’’ ON UNITS FACE.

270 !**** IF YOU WANT TO RE-CALIBRATE ANSWER YES [1]

280 !**** WHEN PROMPTED

290 !****

1000 !**** INITIALIZE UNIT FOR TEST ***

1010 ASSIGN @Hp4291 TO 800

1020 Scode=8

1030 CLEAR @Hp4291

1040 ABORT Scode

1050 OUTPUT @Hp4291;‘‘DISP:ALL BST’’

1070 !

1100 !**** CALIBRATION STATE CHECKING ****

1110 OUTPUT @Hp4291;‘‘SENS:CORR1?’’

1120 ENTER @Hp4291;Stat

230 IF Stat THEN

1130 INPUT ‘‘RE-CALIBRATE NOW? [1] Yes; [0] No

[RETURN OR x1]’’,Ans$

1140 IF Ans$<>‘‘1’’ THEN GOTO Test_loop

1150 END IF

1160 !

1200 !**** SETTING UP START/STOP FREQUENCY ****

1210 INPUT ‘‘Enter Start Frequency in MHz, [RETURN OR

x1]’’,A

1220 B=A*1000000

1230 OUTPUT @Hp4291;‘‘SENS:FREQ:STAR ’’;B

1240 INPUT ‘‘Enter Finish Frequency in MHz, [RETURN OR

x1]’’,A

1250 B=A*1000000

1260 OUTPUT @Hp4291;‘‘SENS:FREQ:STOP ’’;B

1270 !

1300 !**** SETTING ENABLE REGISTER FOR SRQ ****

1310 OUTPUT @Hp4291;‘‘STAT:INST:ENAB 256’’

1320 OUTPUT @Hp4291;‘‘*SRE 4’’

1330 !

1400 !**** SETTING TRIGGER SOURCE INTERNAL, CON-

TINUOUS OFF ****

1410 OUTPUT @Hp4291;‘‘TRIG:SOUR INT’’

1420 OUTPUT @Hp4291;‘‘INIT:CONT OFF’’

1430 !

1500 !**** SETTING CAL MODE TO FIXED/USER ****

1510 OUTPUT @Hp4291;‘‘SENS:CORR1:COLL:FPO USER’’

1520 OUTPUT @Hp4291;‘‘SENS:CORR2:COLL:FPO USER’’

IPC-TM-650

Number

2.5.5.9

Subject

Permittivity

and Loss Tangent, Parallel Plate,

1 MHz to 1.5 GHz

Date

11/98

Revision

age3of5

电子技术应用　　　　　　　ｗｗｗ．ＣｈｉｎａＡＥＴ．ｃｏｍ

1530

1600 !**** SET PTFE STANDARD THICKNESS IN METERS

ON LINE 1610****

1610 OUTPUT @Hp4291;‘‘CALC:MATH1:DIM1 0.00075’’

1620 !

1700 !**** MEASUREMENT TYPE er’ AND tan delta ****

1710 OUTPUT @Hp4291;‘‘DUAM DRLT’’

1720 !

1800 !**** FORMAT LINES LIN Y-AXIS ****

1810 OUTPUT @Hp4291;‘‘DISP:TRAC:Y:SPAC LIN’’

1820 !

1900 !**** SWEEP SETTINGS ****

1910 OUTPUT @Hp4291;‘‘SENS:SWE:SPAC LOG’’

1920 OUTPUT @Hp4291;‘‘SENS:SWE:TIME:AUTO ON’’

1930 OUTPUT @Hp4291;‘‘SENS:SWE:POIN 256’’

1940 OUTPUT @Hp4291;‘‘SENS:SWE:DWEL1:AUTO ON’’

1950 !

2000 !**** CHANNEL 1 SETUP ****

2010 OUTPUT @Hp4291;‘‘INST CH1’’

2020 OUTPUT @Hp4291;‘‘CALC:FORM REAL’’

2030 OUTPUT @Hp4291;‘‘DISP:TRAC1:STAT ON’’

2040 OUTPUT @Hp4291;‘‘DISP:TRAC1:Y:BOTT 1’’

2050 OUTPUT @Hp4291;‘‘DISP:TRAC1:Y:TOP 12’’

2060 OUTPUT @Hp4291;‘‘CALC:EVAL:ON’’‘‘TR1’’’’’’

2070 OUTPUT @Hp4291;‘‘CALC:EVAL:Y:XPOS 1MHZ’’

2080 OUTPUT @Hp4291;‘‘CALC:EVAL:MST ON’’

2090 !

2200 !**** CHANNEL 2 SETUP ****

2210 OUTPUT @Hp4291;‘‘INST CH2’’

2220 OUTPUT @Hp4291;‘‘CALC:FORM LTAN’’

2230 OUTPUT @Hp4291;‘‘DISP:TRAC1:STAT ON’’

2240 OUTPUT @Hp4291;‘‘DISP:TRAC1:Y:BOTT -0.5’’

2250 OUTPUT @Hp4291;‘‘DISP:TRAC1:Y:TOP 1.5’’

2260 OUTPUT @Hp4291;‘‘CALC:EVAL:ON’’‘‘TR1’’’’’’

2270 OUTPUT @Hp4291;‘‘CALC:EVAL:Y:XPOS 1MHZ’’

2280 OUTPUT @Hp4291;‘‘CALC:EVAL:MST ON’’

2290 OUTPUT @Hp4291;‘‘INST CH1’’

2300 !

2400 !**** SETUP AVERAGING ****

2410 OUTPUT @Hp4291;‘‘SENS:AVER1 ON’’

2420 OUTPUT @Hp4291;‘‘SENS:AVER1:COUN 10;STAT

ON’’

2430 !

2500 !**** SELECT 16453A FIXTURE AND COMPENSATE ****

2510 !**** PLEASE SET PTFE STANDARD PERMITTIVITY ON

LINE 2580 ****

2520 !**** PLEASE SET PTFE STANDARD LOSS TANGENT

ON LINE 2590 ****

2530 !**** PLEASE SET PTFE STANDARD THICKNESS IN

METERS ON LINE 2600 ****

2540 OUTPUT @Hp4291;‘‘DISP:FORM ULOW’’

2550 OUTPUT @Hp4291;‘‘DISP:ALL BST’’

2560 OUTPUT @Hp4291;‘‘SYST:FIXT HP16453’’

2570 OUTPUT @Hp4291;‘‘SENS:CORR2:CKIT2 TEFL’’

2580 OUTPUT @Hp4291;‘‘SENS:CORR2:CKIT2:STAN6:PRE

2.1’’

2590 OUTPUT @Hp4291;‘‘SENS:CORR2:CKIT2:STAN6:PLF

0.0001’’

2600 OUTPUT @Hp4291;‘‘SENS:CORR2:CKIT2:STAN6:

THIC 0.00075’’

2610 OUTPUT @Hp4291;‘‘SENS:CORR2:CKIT2:SAVE’’

2620 !

2700 !**** OPEN STANDARD MEASUREMENT ****

2710 ON INTR Scode GOTO Open_end

2720 OUTPUT @Hp4291;‘‘*CLS;*OPC?’’

2730 ENTER @Hp4291;Opc

2740 INPUT ‘‘CONNECT OPEN (OS) STANDARD, THEN

PRESS [RETURN OR x1]’’,A$

2750 ENABLE INTR Scode;2

2760 OUTPUT @Hp4291;‘‘SENS:CORR1:COLL STAN1’’

2770 Wait_open:GOTO Wait_open

2780 Open_end:!

2790 !

2900 !**** SHORT STANDARD MEASUREMENT ****

2910 ON INTR Scode GOTO Short_end

2920 OUTPUT @Hp4291;‘‘*CLS;*OPC?’’

2930 ENTER @Hp4291;Opc

2940 INPUT ‘‘CONNECT SHORT (0 OHM) STANDARD,

THEN PRESS [RETURN OR x1]’’,A$

2950 ENABLE INTR Scode;2

2960 OUTPUT @Hp4291;‘‘SENS:CORR1:COLL STAN2’’

2970 Wait_short:GOTO Wait_short

2980 Short_end:!

2990 !

3100 !**** 50 OHM LOAD STANDARD MEASUREMENT ****

3110 ON INTR Scode GOTO Load_end

3120 OUTPUT @Hp4291;‘‘*CLS;*OPC?’’

3130 ENTER @Hp4291;Opc

3140 INPUT ‘‘CONNECT 50 OHM STANDARD, THEN

PRESS [RETURN OR x1]’’,A$

3150 ENABLE INTR Scode;2

3160 OUTPUT @Hp4291;‘‘SENS:CORR1:COLL STAN3’’

3170 Wait_load:GOTO Wait_load

3180 Load_end:!

3190 !

3300 !**** SAVE UNIT CALIBRATION ****

3310 OUTPUT @Hp4291;‘‘SENS:CORR1:COLL:SAVE’’

3320 !

IPC-TM-650

Number

2.5.5.9

Subject

Permittivity

and Loss Tangent, Parallel Plate,

1 MHz to 1.5 GHz

Date

11/98

Revision

age4of5

电子技术应用　　　　　　　ｗｗｗ．ＣｈｉｎａＡＥＴ．ｃｏｍ