Sencore LC53 Service manual

LC53

“ Z METER"

CAPACITOR — INDUCTOR

ANALYZER

Operation, Application, and Maintenance Manual

"'•4.

S E N C O R E

.. .the electronic instrument “ analyzer people”

3200 SENCORE DRIVE. SIOUX FALLS. SOUTH DAKOTA 57107 -[phone]

1

TABLE OF CONTENTS

SAFETY PRECAUTIONS...................	Inside Front Cover
SIMPLIFIED OPERATIONS.............................................		4
DESCRIPTION
Introduction ...........................................................		6
F e a tu re s .............................................................		6
S p e cifica tio n s .....................................................		6
C o ntrols .................................................................		8
Supplied A ccesso rie s ........................................		10
Optional Accessories.........................................		10
OPERATION
Introduction ..........................................................		12
Power Connection...............................................		12
Fuse R eplacem ent.............................................		12
Test Leads.............................................................		12
Test Lead Mounting C lip ....................................		12
Capacitor Testing
Special Notes on Capacitor T e s tin g ...............		13
Capacity Measurement Accuracy.....................		13
To Eliminate Lead C apacity..............................		14
Checking Capacitors Beiow 2 p F .....................		14
Interpreting “ Z METER” Value Readings.......		14
Testing Large Screw Terminal L y tic s .............		15
Checking Capacitors for Leakage ...................		15
Ceramic, Paper, Mica, and Film Types...		16
Aluminum Lytics..........................................		16
Tantalum L y tic s ..........................................		16
Leakage C h a rts ...................................................		17
Identifying Capacitor Types..............................		17
Tantalum L y tic s .........................................		17
Ceramic D iscs .............................................		18
Film T y p e s ....................................	..............	18
Testing for Dielectric Absorption....................		18
Reforming Lytics on the “ Z METER” ...............		19
Reforming Lytics with a Power Supply...........		19
Capacitor Testing Application Tips
No Value Reading on Small Value
C a pa cito rs .................................................		20
Leakage in Ceramic, Paper, Film, and
Mica C apacitors............................	..........	20
Checking for Leakage Between Sections
of a Multi-Section Lytic............................		20
Large Fluctuations in Lytic Leakage
Readings.....................................................		21
Leakage Measurements of Non-Polarized
L ytics ...........................................................		21
Lytics Sitting in Stock................................		21
Low Value Lytics Used in High
Frequency C irc u its ..................................		21
Intermittent C apacitors ..........................	.	21

Time Required to Obtain a Value
Reading on a Capacitor ...........................	22
Checking Ceramic Capacitors for
Temperature S ensitivity...........................	22
Checking Film Type Capacitors for
Temperature S ensitivity...........................	22
Testing Capacity of Silicon Diodes
and Transistors..........................................	22
Testing High Voltage D io d e s ...................	23
Testing Silicon Controlled Rectifiers
(SCRs) and T R IA C S ..................................	23
Testing SCRs and TRIACS for
DC Latching................................................	23
Testing SCRs and TRIACS for AC Latch
and Unlatch C o n d itio n s ...........................	24
Determining the Length of RF Coaxial
C able ............................................................	24
How to Find a Short in a Coaxial Cable	.. 25
How to Find the Inductance Per Foot of
Coaxial C a b le ............................................	25
Inductor Testing
Checking Inductors for Inductance
V a lu e ..........................................................	26
Balancing Out Lead Inductance...............	26
Checking Coils Below 2 M icrohenrys....	26
Open Winding in a C o il..............................	27
Checking Inductance In-C ircuit...............	27
Testing Inductors on Printed Circuit
Boards..........................................................	27
Mutual inductance......................................	28
Value Reading on High Resistance
C oils.............................................................	28
Inductor C o d in g ..........................................	28
Checking Inductors for Good or Bad
With the Ringing T e s t..............................	29
Inductor Testing Application Tips
Quality Testing on General Coils
and Transformers
Peaking C o ils ......................................	30
Coils in Metal Shields.........................	31
Ferrite Core Transformers and
C o iis ....................................................	31
Testing Flyback Transformers and Yokes
With the Ringing Test.........................	31
In-Circuit Quick Test...........................	31
Testing Yokes with the Ringing Test . . . . 31
Testing Horizontal Yoke Windings
for Good or B a d ................................	32
Testing Vertical Yoke Windings for
Good or B a d ......................................	33

2

MAINTENANCE
in tro du ction ...............................................................		34
Access/D isassem bly..............................................		34
Equipment Required for Calibration......................		34
Meter Calibration......................................................		34
Input Protection Relay Trip Point Adjust..............		35
Inductance Calibration............................................		35
Ringing Test Calibration ........................................		35
Capacitor Calibration..............................................		36
APPENDIX
Capacitor Theory and the “ Z METER” ..................		38
Capacitor Color Code and Marking Charts..........		42
Glossary of T e rm s ....................................................		46
SERVICE AND W ARRANTY.................	Inside Back Cover

3

SIMPLIFIED OPERATIONS

CAPACITOR TESTS

5. Read VALUE of capacitor in pF or uF on Display

7. Select d e ­ sired v o lt­ age for Leakage test

	9. Read LEAKAGE in	8. Push Button
	microamps on
		4 . Push button

2. A d just for 000

6 . Select LEAKAGE RANGE readout w hile pushing Capa­

citor Value button.

1.Open test leads

3.Connect capacitor to test leads

INDUCTOR TESTS

5. Read VALUE of coil in uH or

mH on Display

r,

2. Adjust for 000 readout while pushing Inductor Value button

	4. Push Button	8. Read RINGING TEST on display
		10 or m ore indicates good coil.

6. Push

Button

7. Rotate to Red posi­ tions for Yoke & Flyback ALL posi­ tions for coils

1. Short test leads

3. Connect coil, yoke, or flyback

Notes

5

DESCRIPTION

INTRODUCTION

The use of capacitors in electronics has dramatically increased in the past few years and the forecast is for even a greater usage. The transistor has given way to the IC, but due to the nature and construction of the capacitor and the inductor, these are not replaced with ICs. The more ICs that are used, the more capacitors and inductors that will be used. The tolerance of the capacitor used to be 20%, but today, you will find circuits having 5% tolerance capacitors as standard. The use of electrolytic capacitors has also drastically increased as well as the capacity range. Lytics of 10,000 uF can be found in many consumer electronic items. Now more than ever, the need to measure capacity value, leakage of the capacitor, inductor value and quality of the inductor has become very impor­ tant. Without a good measure of these im portant para­ m eters, proper circuit operation becom es more difficult. Sencore has met the challenge head-on with its all new, autoranging “Z M ETER” , the LC53. Now capacitors can be checked for value and for leakage at the rated working voltage on a digital readout. Inductors can be checked for inductance and for quality with the patented Sencore ringing test. The LC53 is truly the first complete capacitor and inductor analyzer.

FEATURES

The Sencore LC53 “ Z M ETER ” features advanced Digital Logic circuits that provide autoranging of the meter when checking the values of capacity or induc­ tance. Simply hook up the capacitor or the inductor, press the proper VALUE button, and read the value on the large digital readout.

The	“Z M ETER ” also checks capacitors for leakage
with	two selectable	current ranges a t	the rated
working voltage from		3 Volts to 600 Volts. An LED
(located between the		LEAKAGE button	and the

A PPLIED VOLTAGE switch) will flash on and off as a safety reminder when the leakage test voltage is set to 50 Volts or above.

The Sencore patented ringing test checks coils, deflection yokes, and non-iron core transformers with an accurate check of good or bad. There are six switch selectable impedance matching positions to match the coil to the test circuit from 10 uli to 10 II. Good coils will show 10 or more ringing cycles on the digital dis­ play while bad ones will show less than 10.

A special LEAD ZERO control lets you balance out the capacity or inductance of the test leads I'or those accurate readings of the very small capacitors and coils that you may encounter. The “Z M E T E R ” is also protected against accidental application of voltages to the test leads by a front panel replaceable fuse and a special relay inside the instrument.

SPECIFICATIONS

DIGITAL READOUT

TYPE: .5”, 7 segment LED.

ACCURACY: Function accuracy ± resolution error. RESOLUTION: 3 significant digits ±2 counts on 3rd

digit (3Vi digits on capacitors of 100,000 uF to 200,000 uF).

A U T O R A N G IN G : Fully au to m atic decim al placement. One or two place holding zeros added as needed (does not affect accuracy) to provide standard value readouts of uF, pF, uH, or mH.

RANGE INDICATORS: Type: LED.

Operation: Controlled by the autoranging circuits.

CAPACITORS (Out of Ci rcui t):

Dynamic test of capacity value determined by m easur­ ing one RC time constant when capacitor is charged to +5V through:

10 Megohms for 0-9000 pF.

10 Kilohms for 9000 pF-90 uF.

100 Ohms for 90-199,900 uF.

ACCURACY: ± 1%	of reading	+ resolution	error.
±5% of reading +	resolution	error for caps	over

1000 uF.

RANGE: 1.0 pF to 199,900 uF in 10 automatically selected ranges.

CAPACITOR LEAKAGE

ACCURACY: ±5% 4- resolution error.

RANGES: 0 to 99.9 uA and 0 to 9.99K uA in two switch selectable ranges.

VOLTAGES: 12 selectable DC voltages from 3 VDC to 10 VDC filtered and from 1.5 VDC to 600 VDC, non-filtered. Available at test leads only when LEAKAGE pushbutton is depressed. Capacitor is automatically discharged when button is released.

INDUCTANCE (Inor Out-of Circuit)

Patent pending dynamic test of inductance value determined by measuring the EMF caused by a con­ stantly varying current through the coil under test. Current rates are:

10 mA/usec - 0 to 90 uli.

1 mA/usec - 90 to 900 u l i

.1 mA/usec - 900 uli to 9 mH.

.01 mA/usec -9 to 90 mil.

1 uA/usec - 90 to 900 mil.

.1 uA/usec - 900 to 9,990 mil.

ACCURACY: ±2% of reading -*■resolution error. RANGES: 1.0 uli to 9,990 mil in 6 automatically

selected ranges.

6

RINGING TEST

Dynamic test of inductor quality determined by count­ ing the number of cycles the inductor rings before reaching a preset damping point after a given exciting pulse has been applied. (US p atent 3,879,749).

EXCITING PULSE AMPLITUDE: Approximately 7 Volts peak.

ACCURACY: ± 1 count from readings of 8 to 13.

ACCESSORIES (Supplied)

39G143 Test Leads *

39G144 Test Lead Adaptor

39G145 Test Button Hold Down Rod (2 supplied) '

64G37 Test Lead Mounting Clip

68G34 Allen Wrench

44G20 Spare 1 Amp Slo-Blo Fuse

ACCESSORIES (Optional)

39G85 Touch Test Probe

GENERAL

TEM PERATURE RANGES (Typical): Calibrated at 70°F. Rated accuracy range: 50-90 °F, Operating range: 32-130°F.

POWER: 105-130 VAC, 60 Hz, 25 W atts.

TEST LEAD INPUT: Fuse protected with in-line 1 Amp 3AG Slo-Blo fuse.

SIZE: 6 ” x 9” x 11.5” (15.24 cm x 22.86 cm x 29.21 cm) W EIGHT: 7.75 lbs. (3.56 Kg).

“ Specifications subject to change without notice.”

CONTROLS

1.Front panel digital readout, first three digits read the value of capacity, inductance, leakage current or ringing test values, last two digits are place holders and only indicate 0 on larger values of capacity, induc­ tance, or leakage current so all readings are given as pF, uF, uH, or mH.

2.a. Indicator LED, lights up when capacitor read­

ing is in picofarads (pF).

b.Indicator LED, lights up when capacitor read­ ing is in microfarads (uF).

c.Indicator LED, lights up when capacitor leak­ age reading is in microamps (uA).

d.Indicator LED, lights up when inductor read­ ing is in microhenrys (uH).

e.Indicator LED, lights up when inductor read­

ing is in millihenrys (mH).

3. IMPEDANCE MATCH switch, rotated through the last 4 test positions when making the ringing test on yokes and flybacks and through all 6 positions when testing other inductors. A reading of 10 or more indicates a good inductor.

4.Power ON-OFF switch, controls the AC line vol­ tage to the “Z METER”.

5.RINGING TEST pushbutton, depressed when making the patented Sencore ringing test on induc­ tors, yokes, and flybacks to check the quality. Use IMPEDANCE MATCH switch (3).

6.Test Lead Input jack. Unscrew jack for access to input protection fuse.

7.Inductor VALUE pushbutton, depressed when testing inductors for value of inductance.

8.Capacitor VALUE pushbutton, depressed when testing capacitors for capacity value.

9.Leakage chart on pull out.

10.LEAD ZERO adjust, used to balance out the small value of capacity or inductance in the test leads when making precise measurements of small values of capacity or inductance.

11.LEAKAGE test pushbutton, depressed when testing capacitors for leakage after the APPLIED VOLTAGE switch (14) has been set to the working vol­

tage of the capacitor and LEAKAGE RANGE switch (13) is set to the proper value as indicated in the leak­ age chart (9).

12. Caution indicator LED, blinks when the A PPLIED VOLTAGE switch (14) is set to 50 Volts or higher as a warning to the user. Voltage is only present on test leads when LEA KA GE button (11) is depressed.

13.LEAKAGE RANGE switch, used to select the desired range of capacitor leakage current, 0 to 100 uA or 10K uA.

14.APPLIED VOLTAGE SWITCH, used for selecting the desired test voltage when making capaci­ tor leakage tests.

REAR PANEL

15.Rear panel meter zero adjust. Adjust to zero digital readout with all buttons out.

16.39G145 Test Button Hold Down Rod mounting

clip.

17.39G144 Test Lead Adaptor mounting clip.

18.Cord wrapper for storing AC line cord and test

leads.

8

Fig. 1 — Location of controls and features of the LC53.

9

SUPPLIED ACCESSORIES

19.39G145 Test Button Hold Down Rod. Used to hold LEAKAGE (11) button depressed when reform­ ing lytics. (2 supplied — 1 in mounting clip, 1 in spare parts bag.)

20.39G144 Test Lead Adaptor, Used to adapt test lead (21) clips to large screw terminal lytics.

21.39G143 Test Leads. Special low capacity cable with E-Z Hook® clips. Connect to Test Lead Input

jack (6).

22. 64G37 Test Lead Mounting Clip.

23.68G34 Allen Wrench. Used to tighten knobs.

24. 44G20 Spare Fuse. 1 Amp, Slo-Blo.

OPTIONAL ACCESSORIES

25. 39G85 Touch Test Probe for in-circuit testing of coils from foil side of P.C. board.

Notes

OPERATION

INTRODUCTION

Before using your LC53 “Z M ETER ” for the first time, take a few minutes to read through the opera­ tions and applications section of the manual carefully to acquaint yourself with the features of the LC53. Once you are familiar with the general operations, most tests can be performed with the information pro­ vided on the LC53 front panel.

POWER CONNECTION

The LC53 is designed to be operated from 105-130 VAC (50/60 Hz). If 210-230 VAC operation is required, the unit may be modified (at additional cost) by the Sencore Service Department, 3200 Sencore Drive, Sioux Falls, SD 57107.

To operate the LC53 from the AC line:

1.Connect the AC line cord to a 117 VAC (or 220 VAC for modified units) outlet.

2.Turn the power switch on.

3.The LC53 is immediately ready to measure capa­ city or inductance. If precise measurements are to be made, the unit should be allowed to operate for at least

5 minutes to allow the circuits to stabilize.

FUSE REPLACEMENT

AC FUSE: The LC53 does not use an AC line fuse. The unit is protected by a special thermal switch in the power transformer. If the power transformer is over­ loaded, the thermal switch will open the primary, removing the voltage from the unit. Simply allow the unit to cool down and the thermal switch will close, applying power to the primary and allowing the unit to operate again. If your unit goes off, allow it to cool down and turn it on before any troubleshooting is started to allow the thermal switch to close if it has opened.

WARNING

Always replace the fuse in the test lead with a 1 Amp, 3 AG, Slo-Blo type. Any other type or cur­ rent rating may cause internal damage to the unit and will void all warranties.

TEST LEAD FUSE: A 1 Amp, 3AG, Slo-Blo fuse is used in the test lead input on the “Z M ETER” . This protects the input of the unit from voltage applied to the input accidently. Replace with a 1 Amp, 3AG, SloBlo type only.

	BLOWN FU SE CONDITIONS
FUSE	TYPE	CONDITIONS
Test	1Amp	No Leakage readings
Lead	3 AG
Input	Slo-Blo	Capacity reads a small negative
		value unchanged by LEAD
		ZERO adjustm ent

Inductance shows flashing 888 with 0 following indicating open. No indication on Ringing Test.

TEST LEAD INPUT FU SE REPLACEMENT: The fuse for the test lead input is located behind the BNC input jack. The fuse holder may be removed by turning the BNC connector counter clockwise and unscrewing the connector until the fuse is free. The BNC connector of a set of test leads may be used as a “Wrench” to aid in the removal of the fuse holder. When replacing the fuse holder, make sure the holder is screwed in tightly to prevent the connector from turning when connecting and disconnecting test leads. Replace the fuse with a 1 Amp Slo-Blo 3AG fuse only.

)LQ CAPACITOR tU HAND DURING	M O O E L LCJ
>0LARITY AND VOLTAGE RATING.
FUSE

Fig. 2 — The 1 Amp, SA G C Slo-Blo fuse is located behind the test lead input jack.

TEST LEADS

39G1.43 TEST LEADS: The test leads (supplied with the meter) use a special low capacity cable. The use of any other cable will add extra capacity to the meter and may be out of range of the LEAD ZERO control. If the test leads ever need replacem ent, it is recommended that new leads (39G143) be ordered directly from the Sencore Service Department, 3200 Sencore Drive, SiouxFalls, SI) 57 107.

TEST LEAD MOUNTING CLIP

The special Test Lead Mounting Clip (64G37), included in the spare parts, may be mounted on the top of the “Z M E T E R ” , on the side of the handle or on your work bench. The clip can then be used to hold the test leads

12

out of the way, but ready for use at any time. To mount the test lead clip, simply peel off the backing, place on the spot to be mounted, and press firmly.

NOTE: Do not mount the Test Lead Clip to the sides of the “Z M E T E R " as it will interfere with the movement of the handle.

Fig, 3 — The special Test Lead M ounting Clip holds the test leads out of the way, but ready for use at any time.

CAPACITOR TESTING

The “Z M E T E R ” checks capacitors for their actual capacity with 6 automatically selected ranges. Simply connect the capacitor to the test leads, push the VALUE button under CAPACITORS and read the value on the digital readout.

E CAPACITORS I INDUCTORS

LEAKAGE

VALUE I VALUE RINGING T E S T (0}

3V

; JOOV

/ 490V

10V

Fig. 4 — J u st connect the capacitor to the test leads, depress the V A LU E button, and read the capacity on the display; there are no range switches to set.

S P E C IA L N O T E S ON CAPACITOR TE STIN G :

1. Before operating the “Z M E T E R ”, be sure to connect the A C line cord to a properly grounded A C outlet. The third wire ground on the “Z M E T E R ” provides more accurate readings o f low level capacitors (below 1000 pF) with the third wire shielding. Defeat­ ing the third wire ground will not only result in lower accuracy value readings on capacitors below 1000 pF,

but void the warranty as well. I f grounded, outlet is unavailable, use a grounding adaptor and connect the third wire pigtail to a good earth ground such as a waterpipe.

2. The “Z M E T E R ” has been designed to give accu­ rate readings o f capacitor value out o f circuit. Impedances found in the circuit will upset the “Z M E TE R '’'1readings. Capacitors cannot be checked incircuit with any degree o f accuracy or reliability with any known test method.

3. Remove the power from the circuit if a capacitor is to be checked that has one end removed but the other end still connected to the circuit. I f the unit under test is A C operated, remove the A C line cord from the A C outlet. W henever possible, remove the capacitor completely from the circuit.

CAPACITY MEASUREMENT ACCURACY

The Sencore “ Z M E T E R ” has been designed to pro­ vide accurate measurements (within 1% of reading) of capacity using the most accurate method available. The “Z M E T E R ” measures the RC charging time of the capacitor with a precision charging resistor. This gives a true and accurate capacity measurement. The readings of the ‘‘Z M ET E R ” may or may not be the same as those of another instrument using a different measuring system. The bridge, for example, uses an AC signal and measures capacitive reactance, not the actual capacity. Two bridges with different frequency signals will give different capacity readings because the capacitive reactance changes with frequency. The higher the frequency, the lower the capacitive reactance and the lower the capacity reading. The Sencore “Z M E T E R ” will provide a true measure of capacity.

-WARNING

When checking capacitors, connect the capacitor to the test leads before depressing the VALUE or LEAKAGE pushbutton.

To Check Capacitors for Capacity Value

1.. Connect the test leads to the capacitor to be tested. Polarity of the test leads is only important if checking a polarized capacitor such as an electrolytic capacitor. When checking a polarized lytic, the red lead must be connected to the positive terminal.

2.Depress the VALUE button under the CAPA­ CITORS section of the pushbutton switch.

3.Read the value of the capacitor on the front panel readout. The value of capacity will be in microfarads (uF) if the LED in front of the uF indicator is lit. The capacity is in picofarads (pF) if the LED in front of the pF indicator is lit.

13

NOTE: M ost capacitor values will read very quickly, but extremely large electrolytic capacitors (over 50,000 uP) may take a few seco?ids to come up to a reading level. For example, a 50,000 uF will take about 5 seconds before a reading is seen on the digital readout. A n extremely large (100,000 uF) computer-type lytic may take 10 seconds before the value is displayed on the readout. I f the value does not read in the time list­ ed above, then the capacitor is either shorted or very leaky. In either case, it is probably defective. Recheck the value again ju st to be sure.

This procedure provides accurate readings on the capa­ citors being tested. Small value readings (2 pF to 1000 pF) may be off slightly due to the capacity of the test leads. This capacity can be balanced out for extremely high accuracy readings with the LEAD ZERO control. The LEAD ZERO control is automatically switched out of circuit for capacity values above 10,000 pF.

TO ELIMINATE TEST LEAD CAPACITY

1. Place the test leads (with no capacitor connected) on the work area in such a way that they will not be moved when the capacitor to be tested is connected. Be sure that the test leads are not on a metal surface or near an AC power outlet or AC operated device. Stray AC may affect the reading of small values of capacitors.

2.Depress the VALUE button and adjust the LEAD ZERO control until the meter reads 00.0, with negative sign appearing occasionally.

3.Carefully connect the capacitor to be tested to the Lest leads. Depress the VALUE button and read the actual value of the capacitor on the meter.

Fig. 5 Test lead capacity can be zeroed out for extremely accurate readings on small value capacitors.

CHECKING CAPACITORS BELOW 2 PICOFARADS

The autoranging circuit in the “Z M ETER” will often show a “ 00.0” readout for capacitors less than 2 pF. This is due to the “zero window” that is necessary for

the autoranging circuit. Values below 2 pF can be read, however, by using the LEAD ZERO control to offset the meter zero.

To Read Capacitors Less Than 2 pF

1.Place the test leads (with no capacitor connected) on the work area in such a way that they will not be moved when the capacitor to be tested is connected. Be sure that the test leads are not on a metal surface or near AC power or an AC operated device.

2.Depress the VALUE button and adjust the LEAD ZERO control until the meter reads a positive number such as 2.0 pF. A negative number can be obtained on the readout but will give an incorrect reading.

3.Connect the capacitor to the test leads without disturbing their position on the work area.

4.Depress the VALUE button to obtain a reading on the meter. Subtract the setting of step 2 from the read­ ing to get the actual value of the capacitor. For example, if the reading obtained was 2.6 and the set­ ting in step 2 was 2.0, then the capacitor value is 2.6 minus 2.0 or 0.6 pF.

INTERPRETING “ Z METER” VALUE READINGS

Some capacitor defects result in a reading much lower than the tolerance specified for the capacitor. Details on determining the tolerance of common capacitors are included in the Appendix section at the end of the manual. If the reading is outside this tolerance, the capacitor should be considered bad.

Some capacitors, especially aluminum electrolytics, may show an overrange indication (flashing 888). This reading indicates th at the capacitor is defective.

The LC53 automatically displays the two m ost common capacitor values of picofarads (pF) and micro­ farads (uF). Capacitors from 1 pF to .089 uF will show as “p F ” , and capacitors over .09 uF will show as “ u F ” . You may encounter some capacitors that are marked with the opposite multiplier. Some companies, for example, will mark the value of a given capacitor as “.047 u F M, while others may mark the same type of capacitor as “ 4700 pF". The following table will explain how to easily convert one reading to another. This conversion chart also appears on the pull-out

chart on the bottom of the					“Z M ET E R ” for your
convenience.
CHANGE TO	MICROFARADS				NANOFARADS	PICOFARADS
FROM
MICROFARADS				Move decim a l		Move d ec im a l
				3	places right	6 places right
NANOFARADS		Move decim a l				Move d e c im a l
	3	places	left			3 places right
PICOFARADS		Move	decim al Move decim al
	6	places	left	3	places left

Chart 1 — Capacitor multiplier conversion chart

14

TESTING LARGE SCREW TERMINAL LYTICS

Some lytics, especially in industrial applications, use rather large screw terminals rather than the conven­ tional solder terminals. The 39(1144 TEST LEAD Adaptor (supplied with the LC53) should be used to convert the small E-Z 1look “ clips to large alligator clips to fit the large screw terminals. A special clip is mounted on the back of the LC53 to store the 39GI44 when it's not in use.

Fig. 6 — The 39G144 Test Lead adaptor allows even the large screw terminal capacitors to be connected to the LC53 for testing.

To Use the 39G144:

1. Connect the Red E-Z Hook" on the LC53 test leads to the red terminal of the 39G144 TEST LEAD ADAPTOR. Connect the Black clip to the other terminal.

2.Connect the Red alligator clip of the 39G.144 to the positive screw terminal and the Black alligator clip to the negative terminal.

3.Test the capacitor in the usual manner.

CHECKING CAPACITORS FOR LEAKAGE

Capacitors will often read the correct value but exhibit leakage which may affect their operation in the circuit. The “Z M ETER” will check capacitors for this leak­ age at their rated working voltage up to 600 Volts. There are two leakage current ranges, 0 to 100 uA and 0 to 10K uA and 12 voltages from 3 Volts to 600 Volts DC. The voltage is applied to the test leads only when the LEAKAGE button is depressed. The capacitor is autom atically discharged when the LEA K A G E BUTTON IS RELEASED.

|---------------------------

W ARNING ------------------------------

1This instrument is to be operated by a technically trained person only — who understands the shock hazard of up to 600 Volts applied to the test leads during the capacitor leakage test.

DO NOT hold the capacitor in your hand or touch the test leads or capacitor leads when making the leakage test with 50 Volts or more.

NOTE: The red area, of the A P P LIE D VOLTAGE switch should be observed. Voltages in this area are 50 Volts and above and could cause a shock hazard. The blinking LED is an extra reminder that the A PP LIE D VO LTAG E switch is set to 50 Volts or greater. Always observe the red area of the switch in case the extra reminder LED is burned out.

Fig. 7 —- The LC53 can test capacitors for Leakage at the rated working voltage of the capacitor. Just set, the A P P L IE D VOLTAGE switch, set the L E A K A G E R A N G E , and depress the L E A K A G E button and read the leakage on the display in microamps.

To Check a Capacitor for Leakage

1.Connect the capacitor to be tested to the test leads. If the capacitor is polarized, such as an electro­ lytic capacitor, connect the positive end of the capacitor to the red lead and the negative end to the black lead.

2.Select the desired leakage range with the LEAKAGE RANGE switch. The ALL OTHER CAPACITORS (100 uA max) range is used for most small lytics, paper, mica, film, and ceramic capacitors. The LARGE ALUM. ELECTROLYTICS (100K uA max) range is used for large lytics. Consult the leakage chart to determine which range should be used. It is

Fig. 8 — Simply consult the leakage chart on the pull out tab under the LC53 or the leakage chart in this manual for the maximum allowable leakage of alumi­ num and tantalum lytics.

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