TM-11-6625-273-35

TM 11-6625-273-35
DEPARTMENT
OF
THE
F I E L D
ARMY
A N D
TECHNICAL
MANUAL
D E P O T
M A I N T E N A N C E
INSULATION
BREAKDOWN
TEST
SET
AN/GSM-6
This
copy
pages
H E A D Q U A R T E R S ,
from
is
a
reprint
Changes 1
which
and
includes
2.
D E P A R T M E N T
JULY
current
1959
O F
T H E
A R M Y
WARNING
DANGEROUS VOLTAGES EXIST IN THIS EQUIPMENT
Be extremely careful when working on this equipment. Serious
injury or death may result if safety precautions are not observed.
BE
SURE
THE
DISCHARGED
EQUIPMENT
BEFORE
IS
MAKING
COMPLETELY
ANY
REPAIRS.
DON’T TAKE CHANCES!
VOLTAGES AS HIGH AS 40,000 VOLTS MAY
EXIST AT THE FOLLOWING PLACES:
OUTPUT
TERMINALS
OUTPUT CABLE
HIGH-VOLTAGE RECTIFIER
Changes
in
force:
C1
and
C2
TM
11-6625-273-35
C 2
HEADQUARTERS
DEPARTMENT OF THE ARMY,
N o .
W A S H I N G T O N , DC, 3 March 1986
2
TEST
Field
SETS,
and Depot Maintenance Manual
INSULATION BREAKDOWN AN/GSM-6
AND
AN/GSM-6A
TM 11-6625-273-35, 15 July 1959, is changed as follows:
Page 18. Paragraph 19b(2). Add the following Caution
after
paragraph
19b(2):
CAUTION
ard if improperly handled or disposed.
Page 22. Paragraph 23b. Add the following Caution after paragraph 23b:
Before serving this equipment, check prior
CAUTION
Before servicing this equipment, check prior
maintenance records and consult with your
maintenance records and consult with your
Safety Office to ensure that the oil has not
Safety Office to ensure that the oil has not
been contaminated with Polychlorinated Bi-
been contaminated with Polychlorinated Biphenyls (PCB) during the item’s life. PCB’s
are a potential safety and environmental hazard if improperly handled or disposed.
phenyls (PCB) during the item’s life. PCB’s
are a potential safety and environmental haz-
Page 21. Paragraph 22b. Add the following Caution after paragraph 22b:
ard if improperly handled or disposed.
Page 25. Paragraph 24b. Add the following Caution after paragraph 24b.
CAUTION
CAUTION
Before servicing this equipment, check prior
Before servicing this equipment, check prior
maintenance records and consult with your
maintenance records and consult with your
Safety Office to ensure that the oil has not
been contaminated with Polychlorinated Bi-
Safety Office to ensure that the oil has not
been contaminated with Polychlorinated Bi-
phenyls (PCB) during the item’s life. PCB’s
are a potential safety and environmental haz-
phenyls (PCB) during the item’s life, PCB’s
are a potential safety and environmental hazard if improperly handled or disposed.
By Order of the Secretary of the Army:
JOHN A. WICKHAM JR.
General, United States Army
Chief of S t a f f
R. L. DILWORTH
Brigadier General, United States Army
The Adjutant General
DISTRIBUTION:
To be distributed
requirements
for
in
accordance
AN/GSM-6,
with
DA
Form
12-36
literature
-6A.
This publication
Is required
for official we or for
adminls$mtiwe or oporutioncd purpoees only. Distribution is
limited *O US ~vernment Agencies. Other requ~ts fw fhis
dwuwn~ must b refamrod *e Cammmwkw. US Army
timmuniatio*Elwtmnia Command end Forf Monmou*h,
AWN: A~EL-ME-P, Fort Monmoutln, NJ 07703-5007.
TM 11-6625-273-35
HEADQUARTERS,
DEPARTMENT OF THE ARMY
W A S H I N G T O N 25, D. C., 15 July 1969
TECHNICAL MANUAL
No. 11-6625-273-35
I N S U L A T I O N
B R E A K D O W N
T E S T
S E T
A N / G S M - 6
Page
CHAPTER 1.
Section
I.
II.
CHAPTER 2.
THEORY
General theory
Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Block diagram analysis
1
2
2
2
Protective circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3
2
High-voltage circuit . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4
3
Kilovoltmeter circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5
3
Microammeter circuit
6
4
General instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7
6
Troubleshooting procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . .. . . . . . . .
8
6
Tools, test equipment, and material required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9
6
Continuity test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10
7
Localizing troubles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11
12
8
Checking meter circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13
13
Checking rectifier unit . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14
14
Circuit analysis
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TROUBLESHOOTING
General troubleshooting
Section I.
II.
Unit troubleshooting
Checking
CHAPTER 3.
protective
circuits
REPAIRS
General parts replacement techniquies
CHAPTER 4.
9
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
15
15
Removal and replacement of control unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
16
15
Removal and replacement of voltage control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
17
15
Removal and replacement of meters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18
16
Removal and replacement of high-volhge rectifier. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
19
17
Removal and replacement of rectifier tubes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
20
19
Removal and replacement of output terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
21
20
Removal and replacement of transformer T201 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
22
21
Removal and replacement of transformer T2O2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
23
21
Removal and replacement of high-voltage capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
24
25
Purpose of final testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
25
26
Test equipment required . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
26
26
Preliminary
.
27
26
Final tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 8
26
FINAL
TESTING
check
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1
CHAPTER 1
THEORY
Section I. GENERAL THEORY
control unit contains the control circuit and
1. Scope
a. This manual covers field and depot maintenance
for
AN/GSM-6.
Insulation
It
includes
Breakdown
Test
instructions
Set
appro-
priate to third, fourth, and fifth echelons for
troubleshooting, testing, and repairing the
metering circuit; the rectifier unit contains the
oil-immersed high-voltage rectifier and doubler
circuit.
a. The input power is applied to the test set
through the control circuit, The control circuit
equipment, and replacing maintenance parts.
It also lists tools, materials, and test equipment
for third, fourth, and fifth echelon maintenance.
Detailed functions of the equipment are covered in the theory section.
feeds the power to the high-voltage rectifier
and doubler, which provides the dc voltage for
performing the required tests (TM 11-6625273-12).
b. T h e c o m p l e t e m a n u a l f o r t h i s e q u i p m e n t
includes one other publication, TM 11-6625273-12, Insulation Breakdown Test Set AN/
voltage of the tester, and the amount of leak-
GSM-6, Operation and Organizational Maintenance.
c. F o r w a r d
comments
concerning
this
b. The metering circuit indicates the output
age current through the dielectric (insulation)
of the test specimen.
Connection to earth
ground is made through a connector on the
rectifier unit.
man-
ual to the Commanding Officer, United States
Army Signal Publications Agency, Fort Monmouth, N. J.
Note. For applicable forms and records, see paragraph 2, TM 11-6625-273-12.
2. Block Diagram Analysis
(fig. 1)
The test set supplies high-value direct current (dc) voltages for testing the insulation
qualities of electrical insulators. The main
component of the equipment is Insulation
Breakdown Test Set TS-928/G (tester), which
contains a control unit and a rectifier unit. The
Section
II.
Figure 1. Insulation breakdown test set TS-928/Gblock diagram.
CIRCUIT
3. Protective Circuits
(fig. 17)
ANALYSIS
source, and ground cable W201 makes good
The protective circuits prevent power from
connection to both the equipment and to earth
ground. When power is applied to the tester,
being applied to the equipment until all power
the source voltage is fed to relay K101 circuit,
connections are complete and correctly polar-
voltage control T101, and filament transformer
ized.
T202.
a. Power can be applied to the tester when
(1) In the ON position, circuit breaker
both sides of INCORRECT POLARITY indicater DS103 are at ground potential. Under
this condition, terminal 1 of input cable W101
switch CB101 completes the circuit to
connects to the ground side of the power
filaments of rectifier tubes V201 and
2
INPUT VOLTAGE indicator I)S101
and filament transformer T202. The
Figure 2.
TM 6625-273-35-17
V202 heat up and the high-voltage
a. High-voltage Rectifier and Doubler.
output can be obtained.
( 1 ) The outputs of rectifier tubes V201
When pressed,
high-voltage push
switch S101 completes the circuit to
relay K101. Relay K101 energizes and
and V202 charge capacitors C201 and
applies the source voltage to OUTPUT
and R202 are bleeder resistors through
VOLTAGE indicator DS102 and to
which capacitors C201 and C202 dis-
voltage
charge when the equipment is shut
control
C202 through current limiting resistor R205 and R206. Resistors R201.
T101.
down.
Adjusting the position of the arm of
voltage control T101 adjusts the volt-
(2)
With guard strap TB1 connected be-
age that is applied to high-voltage
tween
transformer
adjusting
E201 and guard terminal H10, a nega-
the dc voltage output of the rectifier.
tive voltage output is obtained from
negative (-) output terminal E202.
T201,
thereby
b. P o w e r c a n n o t b e a p p l i e d t o t h e t e s t e r
under the following conditions.
If terminal 2 of input cable W101 is
voltage is applied only across INCORRECT POLARITY indicator DS103.
Ground connection is made to both
sides of the relay circuit, and the
tester cannot be operated.
(+)
output
terminal
( 3 ) With guard strap TB1 connected between negative (-) output terminal
E202 and guard terminal H10, a posi-
connected to the ground side of the
power source (ground cable W201 connected to earth ground), the source
positive
tive voltage output is obtained from
positive (+) output terminal E201
b. Guard Circuit. The guard circuit which
consists of the internal metal shield and the
external guard circuit components is used to
prevent leakage currents from entering the
metering
(1)
If ground cable W201 is not connected
circuit.
Leakage currents within the rectifier
unit are isolated from the metering
circuit by the internal metal shield.
to earth ground, or makes poor ground
connection, or is not connected to the
The internal metal shield is connected
equipment, both sides of INCORRECT
to the transformer cores, the capacitor
POLARITY indicator DS103 are not
support plates (fig. 13), and other
at
metal parts to which leakage currents
might flow.
ground
potential,
and
indicator
DS103 is placed in series with the primary of filament transformer T202.
(2)
This series combination is therefore
in parallel with INPUT VOLTAGE
indicator DS101. When circuit breaker
Leakage currents between the conductor and the lead sheath (or outer
casing) of the test specimen (fig. 2)
are fed to the current metering circuit
switch CB101 is operated, both indi-
(par. 6), Leakage currents on the surface of the insulation of the test specimen are shunted through the guard
cators (DS101 and DS103) light
(DS103 with less brilliance), indicating a poor or no ground connection. If
connector (fig. 17), the terminal strap,
and guard terminal H10 to the internal
metal shield.
circuit breaker switch CB101 and
high-voltage push switch S101 are
both operated, relay K101 is placed in
series with indicator DS103, limiting
the current flow and preventing relay
K101 from operating.
5. Kilovoltmeter Circuit
Kilovoltmeter M101 indicates the dc voltage
output of the tester.
a.
4.
High-voltage
Circuit
(fig. 17)
The high-voltage circuit consists of an oilimmersed high-voltage rectifier and doubler and
a guard circuit.
Negative
Voltage
Output.
When
the
tester
is supplying a negative voltage output (par,
4a (2)), kilovoltmeter polarity switch S105 (fig.
2) is placed in the negative (-) position, placing the kilovoltmeter circuit in the output circuit as follows:
3
(1)
(1)
The negative terminal of kilovoltmeter
M101 is connected, through multiplier
resistor R204, to negative (-) output,
terminal E201 of the rectifier unit.
terminal E202 of the rectifier unit.
( 2 ) The positive terminal of kilovoltmeter
(2)
The negative terminal of kilovoltmeter
M101 is connected, through the inter-
M101 is connected, through the inter-
nal metal shield, to guard terminal
nal metal shield, to guard terminal
H10 of the rectifier unit.
(3)
The positive terminal of kilovoltmeter
M101 is connected, through multiplier
resistor R203, to positive (+) output
H10 of the rectifier unit.
VOLTMETER RANGE switch S103
(fig. 17) places shunt resistance across
kilovoltmeter
(a)
(3)
M101.
scribed in a(3) above.
In the 50 position, the meter is
(4)
Capacitor C102 protects kilovoltmeter
M101 against current surges.
(5)
Glow lamp E102 protects kilovoltmeter M101 from excessive voltage in
shunted by resistor R107 and can
indicate up to 50 kilovolts.
( b ) In the 25 position, the meter is
shunted
indicate
( c ) In the
shunted
by
up
10
by
VOLTMETER RANGE switch S103
functions in the same manner as de-
resistor R108 and can
to 25 kilovolts.
position, the meter is
resistor R110 and can
the same manner as described in a(5)
above, except that the functions of
resistors R203 and R204 are reversed.
indicate up to 10 kilovolts.
(d)
In the 5 position, the meter is not
shunted and can indicate up to 5
Capacitor C102 protects kilovoltmeter
M101 against current surges.
( 5 ) Glow lamp E102, which has a firing
potential of approximately 90 volts dc,
protects
Microammeter
Microammeter
kilovoltmeter
M101
from
cessive voltages as follows:
( a ) The series circuit, consisting
ex-
the
output
charging current of the test specimen.
a. Negative Output. When the tester is supplying a negative voltage output (par. 4a(2)),
microammeter polarity switch S102 (fig. 2) is
placed in the negative (-) position, placing
of
put circuit as follows:
(1)
tions, the voltage across this circuit
is less than 90 volts and the lamp
does not fire.
If the circuit is exposed to an exces-
The negative terminal of microammeter M102 is connected, through current limiting resistor R109, to the control unit chassis which is connected to
earth ground.
(2)
The positive terminal of microammeter M102 is connected to positive (+)
sive voltage, the voltage impressed
on glow lamp E102 exceeds 90 volts
output terminal E201 through current
dc and the glow lamp conducts. The
R102, through the internal metal
shield, through guard terminal H10,
limiting
conduction through the parallel path
increases the current flow through
multiplier resistor R204, increasing
the voltage drop across resistor
R204, and limiting the voltage applied to kilovoltmeter M101.
b. Positive Voltaqe Output. W h e n t h e t e s t e r
is
indicates
the microammeter circuit in series with the out-
glow lamp E102 and resistor R203,
is in parallel with kilovoltmeter
M101. Under normal output condi-
(b)
Circuit
M102
(charging) current of the tester, or the dis-
kilovolts.
(4)
6.
supplying
a
positive
R101,
and
and through guard strap TB1.
(3)
AMMETER
MULTIPLIER
switch
S104 (fig. 17) places shunt resistance
across both microammeter M102 and
current limiting resistor R106.
(a) In the 1000 position, the meter and
(par.
resistor R106 are shunted by resistor R103, and the meter can indi-
(fig. 2) is placed in the positive (+) position,
placing the kilovoltmeter circuit across the out-
cate up to 50,000 microampere.
(b) I n t h e 1 0 0 p o s i t i o n , t h e m e t e r a n d
4
output
R106,
4a(3)), kilovoltmeter polarity switch S105
put circuit as follows:
voltage
resistors
resistor R106 are shunted by re-
sister R104, and the meter can indi-
however,
cate up to 5,000 microampere.
through resistor R102 raises the
the
increased
current
(c) I n t h e 1 0 p o s i t i o n , t h e m e t e r a n d
voltage to more than 90 volts dc, the
resistor R106 are shunted by the
glow lamp conducts, shunts the excessive current around the meter
series combination of resistors R104
and R105, and the meter can indi-
circuit, and limits both the current
and voltage applied to the meter
cate up to 500 microampere.
(d) In the 1 position, the meter and
resistor R106 are not shunted, and
circuit.
b. Positive Output. When the tester is sup-
the meter can indicate up to 50
plying a positive voltage output (par. 4a(3)),
microamperes.
microammeter polarity switch S102 (fig. 2) is
(4) The charging current flows from negative (-) output terminal E202,
through the test specimen to earth
ground, through the meter circuit
((1), (2), and (3) above), to positive
placed in the positive (+) position, placing the
microammeter circuit in series with the output
circuit as follows:
(1) The positive terminal of microammeter M102 is connected, through current
(+) output terminal E201.
(5) To measure discharging current (dur-
limiting resistor R109, to the control
ing shutdown), microammeter polarity
switch S102 is placed in the positive
earth ground.
(2) The negative terminal of microamme-
unit chassis which is connected to
(+) position. The energy contained
in the insulation (dielectric) of the
ter M102 is connected to negative (-)
test specimen becomes the source of
limiting
power, and the current flows in the
R106,
opposite direction from that described
shield, through guard terminal H10,
and through guard strap TB1.
in (4) above.
(6) During either
output,
the
negative
meter
or
positive
protective
output terminal E202 through current
(3)
resistors
through
AMMETER
R101,
the
R102,
internal
MULTIPLIER
and
metal
switch
circuit
S104 functions in the same manner as
described in a(3) above.
(a) Capacitor C101 (fig. 17) protects
microammeter M102 against current
(4) The charging current-flows from negative (-) output - terminal E202,
surges; spark gap E106 grounds
through the meter circuit ((1), (2),
spurious voltage pulses.
and (3) above), and through the test
operates as follows:
(b) D C O V E R L O A D i n d i c a t o r E 1 0 1
(glow lamp), which has a firing
potential of approximately 90 volts
dc,
protects
microammeter
M102
specimen
insulation,
to
positive
(+)
output terminal E201.
(5) To measure discharging current (during
shutdown),
microammeter
polarity
from excessive currents (caused by
switch S102 is placed in the negative
a dielectric breakdown in the test
(-)
position.
The
energy
contained
in the insulation (dielectric) of the
test specimen becomes the source of
specimen). Under normal output
conditions, the voltage across resistor R102 is less than 90 volts dc
and the glow lamp does not fire.
Under excessive current conditions,
power, and the current flows in the
direction opposite from that described
in (4) above.
5
CHAPTER 2
TROUBLESHOOTING
Section
I.
GENERAL
TROUBLESHOOTING
out testing or measuring circuits. All
meter indications or other visual signs
Warning: When troubleshooting or making repairs in this equipment, be extremely
careful of the high voltages. Allow the tester
should be observed and an attempt
to discharge completely before making any
made to sectionalize the fault to a particular
repairs. Always disconnect the input and output cables from the tester before touching any
(2)
unit.
internal part. Failure to follow safety pre-
Operational tests. Operational tests
frequently indicate the general loca-
cautions may result in injury or death.
tion of trouble. In many instances,
7. General Instructions
the tests will help in determining the
exact nature of the fault. Refer to the
equipment performance check list
(TM 11-6625-273-12)
Troubleshooting at field and depot maintenance level includes all the techniques outlined
for organizational maintenance (TM 11-6625273-12) and any special or additional techniques required to isolate a defective part. The
field and depot maintenance procedures are not
complete in themselves, but supplement the procedures described in organizational maintenance. The systematic troubleshooting proce-
c. Localization and Isolation. The tests listed
below will aid in locating and isolating the
trouble. First, localize the trouble to a single
circuit, and then isolate the trouble within that
circuit by resistance measurements.
(1)
Resistance
pare them with test readings.
means of sectionalizing, localizing, and isolating
(2)
techniques.
Troubleshooting
These
dividual component part at fault. Use
the resistance values (par. 10, 13, and
14) to find normal readings, and com-
dure, which begins with the equipment performance checks that can be performed at an
organizational level, must be completed by
8.
measurements.
measurements will help isolate the in-
Troubleshooting
chart. The trouble
symptoms listed in the chart (par.
11c) will aid in localizing trouble to
Procedures
a component part.
a. General. The first step in servicing a defective test set is to sectionalize the fault. Sec-
(3)
tionalization means tracing the fault to a major
Intermittent troubles. In all these
tests, the possibility of intermittent
troubles should not be overlooked. If
component. The second step is to localize the
fault. Localization means tracing the fault to
present, this type of trouble often may
be made to appear by tapping or jar-
a defective part responsible for the abnormal
condition. Some faults, such as burned-out re-
ring the equipment. Check the wiring
and connections to the units of the set,
sistors and arcing or shorted transformers can
often be located by sight, smell, and hearing,
The majority of faults, however, must be localized by checking voltages and resistances.
9. Tools, Test Equipment, and Material
b.
Test
The following tools, test equipment, and material are required for troubleshooting the test
Sectionalization.
Set
AN/GSM-6
Insulation
consists
of
Breakdown
two
major
units: the control unit and the rectifier unit,
The first step in tracing trouble is to locate the
unit at fault by the following methods:
(1) V i s u a l i n s p e c t i o n . The purpose of visual inspection is to locate faults with6
Required
set.
a. T o o l
Equipment
b. Multimeter
TK-21/G.
AN/URM-105.
c. W e m c o C O i l , W e s t i n g h o u s e E l e c t r i c C o r poration.
Section II. UNIT TROUBLESHOOTING
Warning:
Do
no
attempt
removal
or
re-
placement of parts before reading the instructions in paragraph 15.
10.
Continuity
Disconnect
Test
connectors
to electrically separate the control unit from the
rectifier unit. Make the resistance measurements indicated in the following table. When
the faulty part is found, repair the trouble
before applying power to the equipment.
P103
(fig.
7)
and
J203
fig. 17
fig. 17 and 18
fig. 18
fig. 18
par 13d
par. 13b
par. 13a
fig. 18
par. 13d
par. 13b
par. 13a
fig. 18
par. 14a
par. 14a
fig. 19
fig. 14 and 17
fig. 19
fig. 14 and 17
7
fig. 13
fig. 17
fig. 12 and 19
control unit wiring diagram, and figure 19 the
11. Localizing Troubles
a. General. Procedures are outlined in the
following chart for localizing troubles to a
rectifier
unit
wiring
diagram,
b. Use of Chart. T h e t r o u b l e s h o o t i n g c h a r t
stage or part of the test set. Depending on the
supplements
nature of the operational symptoms, one or
more of the localizing procedures will be nec-
cedures outlined in the troubleshooting chart
essary. When use of the procedures results in
localization of trouble to a particular stage or
known, refer to the equipment performance
circuit, but not to a particular part, refer to
paragraphs 12, 13, and 14. Figures 3 through
list
(TM
the
equipment
11-6625-273-12).
performance
Perform
check
the
pro-
(c b e l o w ) . I f n o o p e r a t i o n a l s y m p t o m s a r e
check list (TM 11-6625-273-12).
Caution:
If operational symptoms are not
7 show the location of parts in the control unit;
figures 10, 12, 13 and 14 show the location of
known, or they indicate the possibility of short
parts in the rectifier unit. Figure 17 is the
circuits, make the continuity test (par. 10)
equipment
before applying power to the equipment.
c.
schematic
Trouble-shooting
diagram,
figure
18
the
Chart.
fig. 4
fig. 4 and 6
fig. 3
par. 19c
fig. 17
par. 10
fig. 4 and 6
fig. 4 and 6
fig. 5
fig. 5
par. 17e
fig. 17
fig. 18
fig. 4 and 18
par. 10
fig. 14
par. 18c
fig. 4
par. 10
fig. 18
fig. 17
fig. 18
fig. 4 and 18
fig. 5
8
par. 18
fig. 12
par. 20
fig. 10
par. 24
fig. 14
par. 22
par. 23
fig. 6 and 18
fig. 6 and 18
fig. 18
fig. 18
fig. 18
fig. 6 and 18
fig. 13
fig. 19
(2) Set up the tester controls for a posi-
12. Checking Protective Circuits
a. Prechecking Procedure. Before
checking
the components of the protective circuits ( b
below), perform the preoperational procedures
tive (+) output at 5,000 volts.
b. Checking Procedure.
Warning:
After each check listed below,
(par. 13, TM 11-6625-273-12) with the fol-
turn voltage control T101 to 0, place circuit
lowing
breaker switch CB101 in the OFF position,
exceptions:
(1) Connect the ground cable directly to
lower the high-voltage caution plate against
earth ground instead of to the frame
the output terminals, and allow the tester to
fig. 5 and 18
fig. 4 and 18
fig. 5, 6, and 18
fig. 6
fig. 18
par. 18c
fig. 6 and 18
9
TM 6625-273-35-8
Figure 3.
10
TM 6625-273-35-5
Figure 4.
11
TM 6625-273-35-4
Figure 5.
12
TM 6625-273-35-10
Figure 6.
13.
Checking
Meter
Circuits
a. Resistors. Check the resistors of the meter
circuits as follows:
(1)
Disconnect connector P103 from connector J203 (fig. 7).
(2)
Place AMMETER MULTIPLIER
switch S104 (fig. 4) in position 1.
(3)
Place VOLTMETER RANGE switch
S103 in position 5.
(4)
Measure across each resistor (fig. 6
and 18) listed below; compare the
measured value with the value listed.
b. Capacitors. Check capacitors C101 and
C102 with Multimeter AN/URM-105.
c. High-voltage Resistors. R e s i s t o r R 2 0 3 ( B ,
fig. 14) and resistor R204 (A, fig. 14) are high1 3
voltage meter resistors of 50 megohms each.
To check resistors R203 and R204, follow the
p r o c e d u r e s g i v e n i n p a r a g r a p h 1 0 , i t e m s 2e
and f .
d. Meters. Check
kilovoltmeter
and
ance of the windings of transformers T201 and
proce-
the resistance of each winding and compare the
M101
microammeter M102 as follows:
( 1 ) Perform the preoperational
cracked or loose rectifier tubes. After inspection of the rectifier unit components is completed, check them as follows:
a. Transformers T201 and T202. T h e r e s i s t T202 are given in the following table. Check
dures listed in paragraph 12a e x c e p t
that the output is adjusted for a posi-
meter indication with the value given below.
tive (+) 500 volts.
(2)
Connect Multimeter AN/URM-105
across the output of the tester.
( 3 ) Place
VOLTMETER
RANGE
switch
S103 (fig. 4) in the 5 position.
(4) P l a c e A M M E T E R M U L T I P L I E R
switch S104 in the 1 position.
( 5 ) Turn the tester on and increase the
output until the AN/URM-105 ((2
above) indicates 500 volts.
(a) K i l o v o l t m e t e r M 1 0 1 s h o u l d i n d i c a t e
.5 kilovolt.
fig. 12 and 19
fig. 14
fig. 12
fig. 19
(b) M i c r o a m m e t e r M 1 0 2 s h o u l d i n d i c a t e
25 microamperes.
14. Checking Rectifier Unit
The components of the high-voltage rectifier
are immersed in an oil tank. To locate troubles
in the rectifier, remove the unit from the oil
tank (par. 19) and inspect components for
loose connections, e v i d e n c e o f a r c i n g , a n d
14
b. Resistors. To check resistors R201, R202,
R205, and R206, follow the procedures given in
paragraph 10, item 2g.
c. Capacitors. C h e c k c a p a c i t o r s C 2 0 1 a n d
C202 with Multimeter
substitution (par. 24).
AN/URM-105
or
by
CHAPTER 3
REPAIRS
15. General Parts Replacement Techniques
a. This
chapter
describes
the
c.
Replacement.
(1)
disassembly,
replacement, and reassembly of components of
Insulation
Breakdown
Test
Set
( 2 ) Aline the mounting holes and secure
AN/GSM-6.
the
b. When major repair or replacement is nec-
tempt to replace parts until they are completely
accessible.
c. D u r i n g d i s a s s e m b l y , g r o u p t h e d i s a s s e m -
(4)
(5)
wires to avoid confusion and to facilitate re-
(6)
a. Removal.
bend
the
until
shorting
contact
is
Disconnect the wires from the terminal board.
( 2 ) Loosen the setscrews and remove the
Loosen the camlock retainers (fig. 7)
knob.
(not
(3)
shown) from the control unit frames
(fig. 3).
Remove the screws that secure the
dial plate; remove the dial plate.
( 4 ) Remove the screws that secure voltage
Separate connector P103 from connector J203 (fig. 7),
Remove the mounting screws, spacers,
and mounting nuts from the control
unit frames.
necessary
a. Removal.
(1)
panels
terminals,
17. Removal and Replacement of Voltage
Control
(fig. 8)
-
end
If the shorting bars do not touch the
bars as
made.
Warning: Before attempting any repairs
on the equipment be sure that it has been
the
Lower the high-voltage caution plate
output
it shows no evidence of arcing.
remove
the camlock retainers (fig. 7).
Insert connector P103 into connector
shorting bars touch output terminals
E201 and E202.
sembled, examine each exposed part to see that
it is not bent, broken, worn, or dirty, and that
16. Removal and Replacement of Control
and
(fig. 3) and check to see that the metal
assembly.
d. W h e n e v e r t h e e q u i p m e n t h a s b e e n d i s a s -
Dangerous voltage may be present and may
cause severe injury or death.
spacers,
J203.
bled parts of each unit and tag disconnected
completely discharged (TM 11-6625-273-12).
screws,
( 3 ) Place the end panels (not shown) on
the control unit frames and secure
until the defective part is reached. Do not at-
and
mounting
mounting nuts in place.
essary, follow the sequence of instructions given
unit
Place the control unit on the rectifier
unit (fig. 3).
control T101 to the front panel; remove the voltage control from the rear
of the control unit (fig. 6).
b.Cleaning
and
Inspection.
(1)
Separate the control unit from the
Clean all components of the voltage
control with a dry, lint-free cloth.
(2)
Sand the end of the voltage control
brush (fig. 6) to obtain a flat contact.
Note. If the voltage control brush is
being replaced, sand the contact end to obtain a flat contact.
( 3 ) Inspect all wires and parts of the volt-
Clean the components of the control
unit with a dry, lint-free cloth.
Clean the contact surface of voltage
control T101 (fig. 6).
age control; repair or replace as nec-
Check all components for loose or broken connations, corrosion, and evidence of arcing; clean if necessary.
Replace any worn or defective components.
c.
essary.
Replacement.
(1) Position the voltage control (T101)
against the control panel.
1 5
TM 6625-273-35-9
Figure 7.
(2)
Hold the
secure it with the screws (fig. 8).
(3)
(4)
(5)
(1)
Remove the control unit from the rectifier unit (par. 16a).
panel and secure it with the screws.
(2)
Disconnect the leads (fig. 18) from the
Turn the shaft of the voltage control
fully counterclockwise.
meter.
( 3 ) Loosen the draw-up bolts (fig. 6) and
remove the mounting bracket screws
Place the dial plate on the control
Install the knob on the shaft with the
and mounting brackets to release the
pointer at 0; tighten the setscrews.
(6)
18. Removal and Replacement of Meters
Kilovoltmeter M101 and microammeter M102
are similarly mounted. The following procedures apply to the kilovoltmeter (M101) and
to the microammeter (M102).
1 6
meter.
Connect the wire leads to the terminal
board (fig. 8 and 18).
Note. There are two mounting brackets
on each meter. Both brackets must be removed to release the meter.
(4)
Carefully remove the meter from the
control panel.
b. Cleaning and Inspection.
(1)
Clean
the
exterior
surfaces
of
meter with a clean lint-free cloth.
the
TM 6625-273-35-9
Figure 8.
(2)
c.
Inspect the meter for a damaged or
or when the temperature of the equipment is
missing pointer, broken dial glass, and
below the ambient temperature.
The highvoltage rectifier is oil-immersed in a tank. The
aged or otherwise defective, obtain a
transformers are vacuum-impregnated. Be-
replacement meter.
Replacement.
(1)
Position
the
meter
c a u s e o f t h e h i g h v o l t a g e s i n v o l v e d d u r i n —g
operation, any trace of moisture may cause
in
the
control
panel.
(2)
(3)
internal
breakdowns.
a. Removal.
Secure the meter mounting brackets
to the meter with the mounting
( 1 ) Remove the control unit from the rec-
bracket screws.
(2)
tifier unit (par. 16a).
Tighten the draw-up bolts to secure
Remove
the
tank
mounting
screws
(fig. 3) and the tank mounting nuts
that secure the top plate to the recti-
the meter to the control panel.
(4)
-
overall condition. If the meter is dam-
Connect the leads to the meter (fig.
18).
(3)
fier unit tank.
Work the top plate loose from the
( 5 ) Replace the control unit on the rectifier unit (par. 16c).
(4)
tank.
Lift the high-voltage rectifier and,
with the use of wood blocks (fig. 9),
19.
Removal
and
voltage
Replacement
of
High-
Rectifier
Caution: Do not remove the high-voltage
rectifier from the tank in humid atmosphere
prop it on the tank to drain.
(5)
Remove the high-voltage rectifier from
the tank (after draining) and place
it on a sturdy work bench.
1 7
TM6625-273-35-13
Figure 9.
Caution:
Do not permit the high-
voltage rectifier to remain out of the
tank for more than 90 minutes. If a
delay is evident, reimmerse the unit
in the oil.
C.
Replacement,
(1)
Place a new gasket on the tank flange.
(2)
Check to see that the contact spring
(fig. 10) protrudes approximately 1¼
inches from the transformer bracket;
b. Cleaning and Inspection.
if necessary, bend the contact spring,
(1)
Check the leads for breaks or loose
solder joints,
(2)
Check the copper lining in the tank
for evidence of deterioration or dis-
tank so that output terminals E201
and E202 are on the same side as
coloration.
ground terminal H9 (fig. 3).
(3)
(3)
Check the oil for discoloration or signs
(4)
of contamination, Replace the oil if
necessary (Wemco C oil, Westinghouse
Electric Corporation).
Secure the top plate to the tank with
the tan]. mounting screws and nuts,
(5)
Remove the vent plug or the pipe plug
(TM 11-6625-273-12) from the top
( 4 ) Remove the gasket (fig. 3) from the
(5)
tank and clean off any particles of
plate and check the oil level. The oil
gasket material that remains on the
tank flange.
level should be approximately 1 inch
from the top plate. Add oil if neces-
Check to be sure that ground terminal
H9 makes good contact with the tank;
repair or replace if necessary.
18
Insert the high-voltage rectifier in the
sary.
(6)
Replace the control unit on the rectifier unit (par. 16c).
TM6625-273-35-14
Figure 10.
20.
Removal
and
Replacement
of
Rectifier Tubes
Ratifier tubes V201 and V202 (fig. 12) are
identical and are similarly mounted. The following procedure applies to either tube.
a. R e m o v a l .
(1)
Remove the control unit from the rectifier unit (par. 16a).
( 2 ) Remove the high-voltage rectifier from
the tank (par. 19a).
( 3 ) Remove the tube clip (fig. 12) from
the tube plate cap.
( 4 ) Release the tube base clamp (fig. 14)
and remove the tube.
b. Cleaning and Inspection. Remove the oil
from the rectifier tube with a clean cloth. Examine the tube for damage or evidence of internal arcing. If it is suspected that a tube is
defective,
c.
obtain
a
replacement.
Replacement.
(1)
Insert the rectifier tube in its socket.
( 2 ) Secure the tube base clamp (fig. 14)
on the base of the tube.
(3)
Secure the tube clip (fig. 12) on the
tube plate cap.
(4)
Replace the high-voltage rectifier in
the tank (par. 19c).
1 9
(5) Replace the control unit on the rectifier unit (par. 16c).
21. Removal and Replacement of Output
Terminals
Output terminals E201 and E202 (fig. 11)
are identical and are similarly mounted. The
following procedures apply to both output terminals.
a. R e m o v a l .
(1)
Remove the control unit from the rectifier unit (par. 16a),
(2)
Remove
the
high-voltage
rectifier
from the tank (par. 19a).
(3)
Unsolder the terminal lead (fig. 12
and 18) from the output terminal.
(4)
Loosen the jamnuts (fig. 11) on the
pressure screws to decrease the tension on the output terminal.
(5)
Lift up on the retainer plate and remove the retainer spring; lower and
remove the retainer plate.
(6)
Lift the output terminal out of the top
plate.
Note. The guard ring is connected to
guard terminal H10 (fig. 3) through the
balance strip (fig. 11). The balance strip
is soldered to the guard ring, passes down
through the hole in the top plate, and is
soldered to the guard plate. If it becomes
necessary to replace the guard ring or gasket,
the balance strip must be unsoldered from
the guard plate.
b. Cleaning and Inspection.
(1) Clean all parts of the output terminal;
TM6625-273-35-16
dry thoroughly.
(2) Check the output terminal for cracked
or broken porcelain and broken or
loose components. Repair or replace
when necessary.
c. Replacement.
(1)
Insert the output terminal through
the guard ring, gasket, and top plate.
(2)
Place the retainer plate over the bottom end of the output terminal, with
Figure 11.
(4)
in place.
(3)
(5)
Solder the terminal lead (fig. 12 and
19) to the output terminal.
(6)
Replace the high-voltage rectifier in
the tank (par. 19c).
Insert the retainer spring in the
groove at the base of the output terminal.
2 0
Secure the screws with the
jamnuts.
the convex side of the retainer plate
toward the top plate.
Insert the pressure screws through
the retainer plate and tighten them
sufficiently to hold the output terminal
(7)
Replace the control unit on the rectifier unit (par, 16c).
(3)
22. Removal and Replacement of
Transformer
and associated washers and nuts.
a. Removal.
Note. Be sure to tag all leads or shields before they
are disconnected.
(1)
Secure the transformer to the transformer plate with the bolts, spacers,
T201
(4)
Run the primary leads (T201)
through the primary lead shield. Solder one lead to pin C on the terminal
Remove the control unit from the rec-
tifier unit (par. 16a).
(2) Remove the high-voltage
rectifier
from the tank (par. 19a).
( 3 ) Unsolder the primary leads (T201)
from pins C and D of the terminal
board (fig. 12 and 19); remove the
leads from the shield.
( 4 ) Disconnect the primary lead shield
board and the other lead to pin D on
the terminal board (fig. 12 and 19).
( 5 ) Solder one secondary lead (T201) to
the tube clip of tube V201.
(6)
Connect the other secondary lead to
the capacitor mounting frame (fig. 13
and 19).
(7)
Connect the primary lead shield
(a(4) above) and the secondary lead
from the point of connection.
( 5 ) Unsolder
the
secondary
lead
(T201)
that is connected to the tube clip of
tube V201.
( 6 ) Unsolder the other secondary lead
(T201) from the capacitor mounting
(7)
frame (fig. 13).
Disconnect the secondary lead shield
(fig. 12) from the point of connection.
shield (a(7) above) to their respective points of connection.
( 8 ) Replace the high-voltage rectifier in
the tank (par. 19c).
(9)
23. Removal and Replacement of
Transformer T202
( 8 ) Remove the bolts, spacers, and associated washers and nuts that secure
transformer T201 to the transformer
plate; remove the transformer from
the equipment.
( 9 ) Remove the contact spring (fig. 10)
from the bottom of the transformer
Replace the control unit on the rectifier unit (par. 16c).
a. Removal.
Note. Be sure to tag all leads or shields before they
are disconnected.
( 1 ) Remove the control unit from the rec(2)
bracket.
b. Cleaning and Inspection. R e m o v e
excess
oil from the transformer to permit visual inspection.
Check
for
evidence
of
overheating,
broken wires, and damaged outer wrapping.
Replace if neceseary.
c.
Replacement.
(3)
(4)
tifier unit (par. 16a).
Remove the high-voltage rectifier unit
from the tank (par. 19a).
Remove the rectifier tubes from the
high-voltage rectifier (par. 20a).
Unsolder the terminal leads from output terminals E201 and E202 (fig. 12
and 19).
( 5 ) Unsolder the leads from pins A and B
(not shown) of the terminal board.
C a u t i o n : If a replacement transformer is
to be installed in the equipment, do not remove
it from the sealed container until it is ready
( 6 ) Unsolder the leads that connect resis-
for installation. Prolonged exposure to air
(7)
tors R203 and R204 (fig. 14 and 19) to
the terminal board.
may cause the transformer to break down
during operation.
(8)
tom of the transformer bracket (fig.
Remove the top plate bolts and raise
the top plate.
( 9 ) Unsolder the secondary leads (T202)
10). Check to be sure that the contact
from the tube sockets (fig. 12 and 19)
( 1 ) Install the contact spring at the bot-
spring
protrudes
approximately
1¼
inches.
(2)
Remove the lacing from the cable
leading to connector J203 (fig. 12).
and remove the lacing.
(10)
Unsolder the primary leads (T202)
Dress the primary leads (T201) to
from pins A and B of the terminal
the side of the transformer facing the
board, and remove the leads from the
terminal board (fig. 12).
shield.
2 1
TM 6625-273-35-7
Figure 12.
(11)
(12)
(13)
(14)
Disconnect the primary lead (T202)
shield from its point of connection.
Unsolder the lead c o n n e c t i n g r e s i s t o r
R203 (B, fig. 14) to output terminal
E201 (fig. 19).
Unsolder the lead c o n n e c t i n g r e s i s t o r
R 2 0 4 ( A , f i g . 1 4 ) to output terminal
E202 (fig. 19).
Unscrew the transformer mounting
bolts to release the transformer from
the transformer plate (B, fig. 14).
(15)
2 2
b. Cleaning and Inspection. R e m o v e
excess
oil from the transformer to permit visual inspection.
Check
broken
wire,
Replace
if
for
and
evidence
damaged
of
overheating,
outer
wrapping.
necessary.
c. Replacement
C a u t i o n : If a
replacement transformer is
to be installed in the equipment, do not remove
it from the sealed container until it is ready
Unscrew the screws (not shown) to
for installation. Prolonged exposure to air
release the resistor mounting plates
may cause the transformer to break down
from the transformer.
during operation.
TM 6625-273-35-6
Figure 13.
Secure the resistor mounting plate
(A, fig. 14) to the transformer with
(5)
the
screws
(not
shown).
Position the transformer on the transformer plate (fig. 12) with the leads
Solder one primary lead (T202) to
pin A of the terminal board (fig. 12
and 19) and the other primary lead to
pin B.
(6)
at the bottom.
Solder one pair of secondary leads
(T202) to the filament pins on tube
Secure the transformer in place with
the mounting bolts (B, fig. 14).
V201
Connect the primary lead (T202)
shield to its point of connection
( a ( 1 1 ) a b o v e ) . Insert the primary
leads through the shield.
(7)
socket.
Solder the other pair of secondary
leads to the filament pins on tube V202
socket.
( 8 ) Lace the leads to the transformer.
2 3
TM 6625-273-35-15
Figure 14.
(9)
(10)
Solder one end of a terminal lead to
output terminal E201 and the other
end of the terminal lead to R203 (B,
(12)
fig. 14) .
(13)
other end of the terminal lead to R204
(A, fig. 14).
(11)
Replace the top plate (fig. 12) and secure it in place with the top plate
bolts.
24
above); lace the leads to a post.
Solder one end of the other terminal
lead to output terminal E202 and the
Solder the leads to pins A and B (fig.
19) of the terminal strip (a(5)
(14)
Solder the leads that connect resistors
R203 and R204 (fig. 14) to the terminal board (a(6) above).
Install the rectifier tubes in the highvoltage rectifier (par. 20c).
(15)
Replace the high-voltage rectifier in
the tank (par. 19c).
(16)
Replace the control unit on the rectifier unit (par. 16c).
24. Removal and Replacement of Highvoltage
Capacitors
Capacitors C201 and C202 (fig. 13) are identical and similarly mounted. The following
procedures apply to both capacitors.
a.
Removal.
( 1 ) Remove the control unit from the rec-
tion. Check the capacitor for cracked or broken
porcelain deterioration, and evidence of leakage; replace if necessary.
c. Replacement.
( l ) Place the capacitor on the bench in
position for insertion in the high-voltage rectifier.
(2)
tifier unit (par. 16a).
(2) Remove the high-voltage
from the tank (par. 19a).
(3)
Lower
the
high-voltage
rectifier
over
the capacitor. Be sure that the lug of
rectifier
Remove the rectifier tubes from the
high-voltage rectifier unit (par. 20a),
the resistor (R205 or R206) is
tioned on the capacitor terminal.
(3)
posi-
Position the capacitor support plates
and
secure
them
with
the
support
( 4 ) Remove the assembly screws (fig. 14)
and remove the side plate from the ca-
plate nuts.
( 4 ) Replace the washer and nut on the
pacitor mounting frame (fig. 13).
( 5 ) Remove the nut and washer from the
terminal of the capacitor.
capacitor terminal.
( 5 ) Secure the side plate (fig. 13) in place
with the assembly screws.
( 6 ) Remove the support plate nuts and
(6)
permit the support plates to drop free.
(7)
Carefully lift the high-voltage rectifier and remove the capacitor.
b. Cleaning and Inspection. R e m o v e
excess
oil from the capacitor to permit visual inspec-
Install the rectifier tubes in the highvoltage rectifier (par. 20c).
(7)
Replace the high-voltage rectifier in
the tank (par. 19c).
( 8 ) Replace the control unit on the rectifier unit (par. 16c).
2 5
CHAPTER
FINAL
4
TESTING
(5) Replace the end panel and secure the
25. Purpose of Final Testing
camlock
The tests outlined in this chapter are de-
retainer.
of repaired equipment. Equipment that meets
b. Protective Circuit. To test the components of the protective circuit, follow the pro-
the minimum standards stated in these tests
cedures given in paragraph 12.
signed to measure the performance capability
will furnish satisfactory operation, equivalent
to that of new equipment.
c. Meter Circuit Test.
(1)
26. Test Equipment Required
Connect the high-voltage connector of
the output cable to the positive terminal of milliammeter M1.
In addition to the tools and test equipment
listed in paragraph 9, the following items are
required for final testing.
(2)
Connect the negative terminal of milliammeter M1 directly to ground terminal H9 (fig. 3).
(3)
Connect Multimeter AN/URM-105
between connector J102 (fig. 4) and
ground terminal H9 (fig. 3); set the
AN/URM-105 to its 10-volt dc range.
(4)
Set AMMETER MULTIPLIER
S104 (fig. 4) to position 100.
switch
( 5 ) Raise the high-voltage caution plate.
( 6 ) Start the tester and very slowly a d just voltage control T101 until both
microammeter M102 and milliammeter M1 indicate 5,000 microamperes (5 milliamperes on M1).
(7)
The AN/URM-105 should
between 4.8 and 5.2 volts.
(8)
Shut down the test set (TM 11-6625273-12) and disconnect all cables and
27. Preliminary Check
a. P e r f o r m
the
preoperational
procedures
(par. 12a) except that the output is adjusted
for a positive (+) 40,000 volts.
b. N o c o r o n a f o r m a t i o n , f l a s h o v e r , o r l e a k age current should be present.
c. S h u t d o w n t h e e q u i p m e n t ( T M 1 1 - 6 6 2 5 273-12).
28. Final Tests
test equipment.
d. Leakage with Positive Output.
(1)
(2)
Loosen the camlock retainer and remove the end panel.
Measure the gap in spark gap E105
(fig. 5). It should measure between
.0015 inch and .002 inch.
(3)
2 6
Place AMMETER MULTIPLIER
switch S104 (fig. 4) in position 1.
Place
AMMETER
MULTIPLIER
switch S104 (fig. 4) in position 1.
( 2 ) Place VOLTMETER RANGE switch
(3)
S103 in position 50.
Place
both
polarity
switches
(S102
and S105) in the positive (+) posi-
a. Spark Gap E105 Setting.
(1)
indicate
tion.
(4)
Raise the high-voltage caution plate.
(5)
Start the tester and
to 40,000 volts.
( 6 ) Microammeter
M102
adjust
should
the
output
indicate
less than
microampere.
( 7 ) Shut down the test set (TM 11-6625273-12)
( 4 ) Measure the resistance of the gap.
e. Leakage with Negative Output. F o l l o w
The resistance should be 112,000 ohms
the procedures in d above, but set up the equip-
±5 per cent.
ment for a negative (-) output.
f. Voltage Under Load with Positive Output.
(1)
Connect
resistors
R1
and
R2
and
milliammeter M1 in series between
output terminal E201 and ground terminal H9. Be sure that the polarity of
milliammeter M1 is correct. Set AMMETER
MULTIPLIER
switch
but set up the equipment for a negative (-)
output. Be sure that the polarity of milliammeter M1 is correct.
h.
Leakage
Test
with
Positive
AMMETER
MULTIPLIER
switch S104 (fig. 4) in position 1.
(2) Start the tester and adjust the output
to the 100 position.
for 40,000 volts.
(3) Permit the equipment to operate for
for 40,000 volts.
Microammeter
Hour
(1) Place
S104
(2) Start the tester and adjust the output
(3)
One
output.
M102
and
1 hour.
milliam-
meter M1 should both indicate be-
(4) At the end of the hour, note the indi-
tween 980 and 1,020 microampere (.9
cation on microammeter M102. The
to 1 milliampere on M1).
indication should
microampere.
(4) The setting of voltage control T101
should be approximately 120.
i.
be
less
(5) Shut down the equipment.
One
Hour
Leakage
Test
with
than
.5
Negative
(5) Shut down the test set and disconnect
the test equipment.
Output. Follow the procedures given in h
g. Voltage Under Load with Negative Out-
above, but set up the equipment for a negative
put. Follow the procedures given in e a b o v e ,
(-) output.
2 7
Figure 15.
28
Figure 16.
29
TM6625-273-35-18
Figure 19.
30
TM6625-273-35-2
Figure 17.
TM6625-273-35-11
Figure 18.
L. L. LEMNITZER,
General,
Official:
United
States
Army,
Chief of Staff.
R. V. LEE,
Major General, United States Army,
The
Adjutant
General.
Distribution:
Active Army:
USASA (2)
CNGB (1)
Technical Stf, DA (1) except
CSigO (30)
Technical Stf Bd (1)
USCONARC (5)
USA Arty Bd (1)
USA Armor Bd (1)
USA Armor Bd Test Sec (1)
USA Inf Bd (1)
USA Air Def Bd (1)
USA Air Def Bd Test Sec (1)
USA Abn & Elct Bd (1)
USA Avn Bd (1)
USA Arctic Test Bd (1)
USARADCOM (2)
USARADCOM Rgn (2)
OS Maj Comd (5)
OS Base Comd (5)
Log Comd (5)
MDW (1)
Armies (5) except First US Army (7)
Corps (2)
Div (2)
USATC (2)
Fld Comd, Def Atomic Spt Agcy (5)
Yuma Test Sta (2)
USA Elct PG (1)
Svc Colleges (5)
Br Svc Sch (5) except USASCS (25)
Gen Depot (2)
Sig Sec Gen Depot (12)
Sig Depots (19)
AFIP (1)
WRAMC (1)
AMS (1)
Engr Maint Cen (1)
USA Comm Agcy (2)
USA Sig Comm Engr Agcy (1)
USA Sig Eqp Spt Agsy (2)
USA Sig Msl Spt Agcy (18)
Trans Terminal Comd (1)
Army Terminals (1)
Port of Emb (OS) (2)
OS Sup Agcy (2)
Sig Fld Maint Shops (3)
Sig Lab (5)
Mil Dist (1)
USA Corps (Res) (1)
Sectors, USA Corps (Res) (1)
USASSA (15)
Midwestern Rgn Ofc (USASSA) (1)
JBUSMC (2)
USA Sig Pubs Agcy (8)
Army Pictorial Cen (2)
USA Ord Msl Comd (3)
Units org under fol TOE:
11-7 (2)
11-16 (2)
11-57 (2)
11-97 (2)
11-117 (2)
11-155 (2)
11-500 AA-EE (2)
11-587 (2)
11-592 (2)
11-597 (2)
NG: State AG (3).
USAR: None.
For exp~anation of abbreviations used, see AR 320-50.
3 1
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