Elgar 400 Series User manual

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PRECISION POWER
PRECISION POWER
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ELGAR CORPORATION
OEM' [Mir4.•••••
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PRECISION POWER
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SERIES 400
PLUG-IN OSCILLATORS
4/9.2
SERIAL NO i°3 •
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TABLE OF CONTENTS
SECTION I INTRODUCTION AND GENERAL DESCRIPTION
SCOPE OF MANUAL 1-1
INTRODUCTION 1-1
GENERAL DESCRIPTION 1-1
SECTION II PRELIMINARY INSPECTION AND OPERATION
INSPECTION UPON RECEIPT 2-1
OPERATION 2-1
SECTION III THEORY OF OPERATION
GENERAL 3-1
GENERAL CIRCUIT DESCRIPTION 3-1
TWO AND THREE PHASE OSCILLATORS 3-8
INTERCONNECTIONS FOR TWO AND THREE PHASE OPERATION 3-8
SECTION IV MAINTENANCE
SERVICE INFORMATION 4-1
FACTORY REPAIR 4-1
SHIPPING DAMAGE 4-1
TEST POINTS 4-1
TROUBLESHOOTING 4-1
SECTION V PARTS LIST
PARTS COMMON TO ALL OSCILLATORS 5-2
PARTS PECULIAR TO 0.1% OSCILLATORS 5-3
PARTS PECULIAR TO 0.0001% OSCILLATORS 5-3
PARTS PECULIAR TO 2 & 3 PHASE OSCILLATORS 5-4
PARTS PECULIAR TO 0.01% OSCILLATORS 5-4
FIGURE PAGE
1-1 400 SERIES OSCILLATOR MODEL NUMBERING SYSTEM 1-1
3-1 SCHEMATIC DIAGRAM FOR 0.01% AND 0.0001% OSCILLATORS 3-3
3-2 SCHEMATIC DIAGRAM FOR 0.1% OSCILLATORS 3-5
3-3 REAR PANEL CONNECTIONS FOR TWO OR THREE PHASE OPERATION 3-7
3-4 TWO AND THREE PHASE CIRCUIT BLOCK DIAGRAM 3-8
LISTOF ILLUSTRATIONS
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SERIES 400
SECTION I
INTRODUCTIONANDGENERAL DESCRIPTION
SCOPE OF MANUAL
This manual describes the Series 400 plug-in oscil-
lators manufactured by Eiger Corporation for use with
the Eiger Power Sources. The manual contains installa-
tion, operation, and maintenance instructions, circuit
descriptions, circuit diagrams, and parts lists.
INTRODUCTION
The Eiger Series 400 plug-in oscillators provide
stable input frequency signals for the Eiger Power
Sources. The plug-ins provide frequency accuracy of
0, 1%, 0.01%, and 0.0001% (see Figure 1-1 for an
explanation of model numbering). The 0.01% and
0.0001% oscillators utilize a crystal-control led oscilla-
tor, In the 0.1% models, a square wave is generated by
positive feedback around the filter to generate the basic
frequency signal which is filtered in two operational
SECTION I
amplifier filters arranged in series. Frequency adjust-
ments may be made from the front panel.
In the 0.01% and 0.0001% models, the crystal
oscillator output is divided through a series of integrated
circuit flip-flops to obtain the designed output fre-
quency. The output of the frequency divider flip-flops
is filtered in two operational filters arranged in series.
GENERAL DESCRIPTION
The Eiger oscillators are contained in a plug-in en-
closure which can be inserted into the front panel open-
ing of an Eiger power source. The plug-in enclosure
contains a horizontally-mounted printed circuit board,
and a terminal connector which mates with a similar
connector in the power source. The 0.1% model is pro-
vided with a front panel access hole for a screwdriver
frequency adjustment. The oscillators are available in
50, 60, 400, 800, 3200 and 4800 Hz output frequencies,
or any frequency from 45 Hz to 10 KHz on special order.
4 X X „XX
I1---- FREQUENCY TOLERANCE (REFER TO NOTE 1)
NUMBER OF PHASES (REFER TO NOTE 2)
FREQUENCY (REFER TO NOTE 3)
400 SERIES PLUG-IN OSCILLATOR
4 4 2 .01 EXAMPLE
0.01% FREQUENCY ACCURACY
2-PHASE OSCILLATOR
400Hz OUTPUT FREQUENCY
400 SERIES PLUG-IN OSCILLATOR
NOTES
1. TOLERANCES ARE 0.0001%,, 0.01°/.,
AND 0.17°.
2. AVAILABLE IN 1, 2, OR 3 PHASE.
3. 5 .50Hz; 6. 831-1z; 4.400 Hz;
8= 800 Hz; 32 .3200 Fl z; 48.4800 Hz;
ETC.
Figure 1-1. 400 Series Oscillator Model Numbering System.
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SERIES 400
SECTION II
PRELIMINARYINSPECTIONAND OPERATION
INSPECTIONUPON RECEIPT
The Elgar Plug-In Oscillators ore aligned, cali-
brated, and tested prior to shipment. The instrument is
therefore ready for immediate use upon receipt. The
following checks should be made, however, to assure
that the instrument has suffered no damage during
shipment.
Make a visual inspection of the shipping con-
tainer prior to accepting the package from the
carrier. If extensive damage to the shipping
container is evident, a description of the dam-
age should be noted on the carrier's receipt,
and signed by the driver of carrier agent. IF
damage is not apparent until the instrument is
unpacked, a claim for concealed damage should
be placed with the carrier and all shipping con-
tainers and filler material saved for inspection.
Forward a report of damage to the Elgar Service
Department, which will provide instructions for
repair or replacement of the instrument.
SECTION II
2, Make a visual inspection of the instrumentwhen
it is removed from the shipping container.
OPERATION
Operating the plug-in oscillator requires only the
following steps:
1. Set the POWER switch on the front panel of the
Power Source to OFF,
2. Insert the plug-in module in the Power Source
through the front panel opening; the oscillator
plug-in is completely seated when the oscillator
front panel and the Power Source front panel
from a smooth plane.
3, Apply power to the Power Source.
4. For the 0. 1% models only, use a screwdriver,
inserted through the front panel access hole, to
make any minor adjustment of the output fre-
quency which may be required.
2-1
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SERIES 400 SECTION III
SECTION III
THEORY OF OPERATION
GENERAL
The Elgar Series 400 plug-in osci I lators all use simi-
lar low voltage power supplies and operational amplifier
filters, and draw operating power from the Elgar Power
Source. The amplitude of the output signal for all units
is controlled by the Power Source front panel AMPLI-
TUDE control (a potentiometer which is physically lo-
cated in the Power Source enclosure). The 0. 1% model
uses a positive feedback square wave input to the opera-
tional active filters. The closer tolerance models con-
tain a crystal oscillator, and a frequency dividing circuit
formed by a series of integrated circuit flip-flops. The
output of the oscillator is a symmetrical square wave free
from even harmonics.
GENERALCIRCUIT DESCRIPTION
The 0.01% and 0.0001% tolerance oscillators (see
Figure 3-1) generate the output frequency with a crystal
oscillator operating at a frequency near 100 KHz and a
chain of flip-flops which divide the oscillator frequency
by some power of two to generate the output frequency.
For example, 400 Hz is generated by a 102.4 KHz crys-
tal and then divided by 256 with 8 flip-flops. The
square wave output of the flip-flop chain is amplitude-
stabi lized by zener diode and then filtered in a two-
section active low-pass filter to remove the harmonic
distortion and produce a pure sine wave. The active
filter is tuned to peak response at the output frequency
and has 180° phase shift at the output frequency.
The 0.1% tolerance oscillators (see Figure 3-2 also
operate by generating a square wave and filtering it in a
two-section active filter. In these oscillators, however,
the square wave is generated by positive feedback around
the filter through an inverting clipper. The feedback
system oscillates at the frequency where the filter phase
shift is 180°.
A trimpot is provided to adjust the frequency of the
0.1% oscillators. The 0.01% oscillators do not require
afrequency adjustment. The 0.0001% oscillatorsrequire
an adjustment to compensate for crystal aging,
In the crystal-controlled oscillators, R101 and
diodes CR101 through CR I05 reduce an unregulated +42
VDC input from the power source to +3.6 VDC collector
voltage for the oscillator and integrated circuits. The
oscillator, which does not require an oven, consists of
the crystal and transistors Q 101 and Q102. The square
wave oscillator output is divided through an appropriate
number ofintegratedcircuit flip-flops to produce, at the
base of transistor Q103, a square wave at the output fre-
quency. The crystal frequency and number of dividing
flip-flops used for any output frequency is shown on the
table given in the schematic diagram. Transistor Q 103
is a saturated switch which switches the output from re-
sistor R107 to ground or across the anode of CR 106,
producing a symmetrical equal duty ratio square wave.
Half the time the output is +6,2 volts (approximately)
and the other half the time the output is ground. CR106
is a 2N3638 transistor used as a zener diode. The output
from the oscillator section is applied to the active filter
circuits through resistor R108, the value of which is de-
termined by oscillator frequency.
The filter circuits consist of two similar operational
amplifiers with frequency-selective feedback networks
which produce the filtering action. The first filter is
tuned by resistors R108, R109, and R110 and capac i tors
C102 and C 103. The values of these components depend
on the required output frequency, and can be determined
by consulting the table presented on the schematic dia-
gram. The first operational amplifier consists of transis-
tors Q 104, Q 105, and Q 106. The second fi !ter, in series
with the first, is tuned by resistors RI18, R119, and R120
and capacitors C107 and C 108. The second operational
amplifier consists of transistors Q107, Q108, and Q 109.
The plug-in oscillators operate on +42 VDC and -42
VDC supplied by the Power Source. The input voltage
is regulated at +15 VDC and -15 VDC in the plug-in
enclosure. Amplifier transistor Q110 compares the volt-
age developed across CR107 to the +15 VDC regulated
output, divided across resistors R132 and R133. The am-
plifier transistor Q114 compares the +15 VDC output to
the -15 VDC output. Regulation of both supplies is im-
proved by bootstrapping the amplifier collector load with
3-1
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-7-
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SPIT. 1 OF kmemATt
04- 065„iiii
3-3
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SaiT. 1OF , 63
3-5
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SERIES 400
0...z.....,
7,
e
t
SECTION III
2-PHASE
3-PHASE OPEN-DELTA (208V)
2 AMPLIFIER WYE (28V)
A(115V)
A(28V)
N
B(115V)
13(28V)
A
C
B
C
3-PHASE OPEN-DELTA C28V) A
1,-
C
B
3-PHASE OPEN-DELTA (115V)
2AMPLIFIER WYE (115V
3AMPLIFIER WYE
Figure 3-3. Rear Panel Connections for two or Three Phase Operation.
C
A(115V)
A(2 8V)
8(115V)
B(28V)
N
C(115V)
CC28V)
3-7
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SECTION III SERIES 400
zener diodes, referencing the amplifier collector load to
the regulator output. CR108 is a 2N3638 transistor used
as the zener for the +10 VDC regulator, and CR109 is a
similar transistor used as the zener for the -10 VDC
regulator .
TWOAND THREEPHASE OSCILLATORS
Two or three ELGAR AC Power Sources maybe used
to generate two phase or three phase AC power. Two
phase or three phase signals aregenerated in a two phase
or three phase plug-in oscillator installed in the master
power amplifier. Signals from the oscillator are carried
by interconnecting cables to one or two slave powerom-
plifiers (see Figure 3-3), each of which has o dummy
oscillator panel (Model 400-B or 400-C) installed in it.
The front panel amplitude control on the master amplifier
controls the amplitude of all the amplifier outputs simul-
tanecusly. The front panel amplitude controls of the
slave amplifiers ore used to set their output voltages
equal to the master amplifier output.
INTERCONNECTIONSFOR TWO
ANDTHREEPHASE OPERATION
Two phase operation requires two power amplifiers.
Three phase operation may be accomplished with three
amplifiers in "Wye" connection, or with two amplifiers
in either "Wye" or open Delta connection. For the two
amplifier "Wye" connection, the two secondaries on
each output transformer are separated; one winding from
the master amplifier gives the phase "A" output. One
winding from the slave amplifier gives the phase "C"
output. The remaining windings from the two amplifiers
are connected in series to give the phase "B" output
which is the negative vector sum of the phase "A" and
phase "C" output.
Ablock diagram of circuitry used to generate two
or three phase signals is provided in Figure 3-4. The
single phase signal from the Oscillator is attenuated by
the master amplifier front panel amplitude control RI.
This control acts as a master control to adjust all the
signal amplitudes simultaneously.
The signal From RI is also connected to the signal
splitter, Q1 and Q2, which develops signal voltages
across R3 and R4 which are equal in amplitude and op-
posite in phase, These signals are applied toall-pass
phase-shifting networks R5-C1 and R6-C2 which pro-
vides 120° phase lead and 120° phase lag respectively.
The phase shift networks are isolated from their respec-
tive power amplifier inputs by unity-gain buffer amp-
lifiers,
For two phase operation, the R5-C1 network is
omitted, together with its buffer amplifiers and R6-C2
components ore chosen for 90° phase-shift.
Figure 3-4. Two and Three Phase Circuit Block Diagram.
3-8
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SERIES 400 SECTION IV
SECTION IV
MAINTENANCE
SERVICE INFORMATION
Questions concerned with the operation, repair, or
servicing of this instrument should be directed to the
nearest Elgar representative or to the Service Depart-
ment, Eigar Corporation, 8046 Engineer Road, San
Diego, California 92111. INCLUDE THE MODEL
NUMBER AND SERIAL NUMBER in any correspondence
concerning the instrument.
FACTORY REPAIR
Should it be necessary to return an instrument to the
factory for repair, please contact the Elgar Corporation
Service Department for authorization to make shipment.
DO NOT RETURN THE UNIT FOR REPAIR WITH-
OUT AUTHORIZATION.
SHIPPING DAMAGE
It is possible for equipment to be damaged in ship-
ment, Therefore, it is imperative that the instrument
be tested and inspected as soon as it is received. If the
instrument shows signs of damage, notify the carrier
immediately. The carrier's claim agent will prepare a
report of damage to be forwarded to the Elgar Service
Department. You will be advised as to the action nec-
essary to have the instrument repaired or replaced.
TEST POINTS
Tes t points on the plug-in oscillator printed circuit
board are shown in figures 3-1 and 3-2. These test
points are accessible by removing the bottom cover of
the power source.
Theoutputs of the various test points are as follows:
Square Wave
First Fi1 ter
Second Filter
BPhase
CPhase
6V p-p
7:1110V p-p
•;:s10V p-p
s10V p-p sine wave
IOV p-p sine wave
TROUBLESHOOTING
Whenever trouble is suspected in the plug-in unit,
substitution of a unit known to be good will provide a
quick check. If it is determined that trouble does exist
in the plug-in unit, the first step is a check of the +15
VDC and -15 VDC. If the output is greatly reduced,
check the oscillator operation at the collector of Q 103.
If a square wave of the proper frequency and amplitude
is present, the trouble may be in the filter. Check the
output of the first filter section at Q 106.
NOTE
If 'a crystal-controlled osci I lator is not
working, check the crystal. Dropping
the unit, or other rough handling may
fracture the crystal.
Troubleshooting is accomplished by signal tracing at
the test points on the underside of the circuit board. For
the crystal-controlled models, test for a signal at the
crystal oscillator, the flip-flop dividers, a square wave
at CR 106 and a sine wave at the two filter outputs, and
at the B and C phase outputs.
If no output is present on the 0.1% model, inject a
3 VRMS signal at appropriate frequency through a 3.3K
resistor to the base of QI03. Check for 5.2V p-p signal
at CR 101 and for correct signals at the filter and B and
Cphase outputs.
The output frequency of the 0.0001% oscillator is
adjustable by a screwdriver adjustment at the top of the
oscillator module. Access is gained to this adjustment
by removing the top cover of the power source. Allow
a30 minute warmup period. Do not change frequency
setting unless a frequency standard of adequate accuracy
is available for comparison.
4-1
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SECTION IV SERIES 400
PHASE ANGLE ADJUSTMENT
The phase angle adjustments are set at the factory
and should not be disturbed unless appropriate test
equipment is available to determine the output phase
angles. IF an accurate phase angle meter is not avail -
able, phase angles may be determined by line-to-line
voltage measurements, The front-panel voltmeters in the
Elgar power sources are only accurate to +3% and are
not suitable for precision phase angle adjustment.
Open Delta Connection: Set the two amplifier out-
puts ECA and ECB to 120V. Adjust V, R148, until the
open-leg voltage, EAB is 120V. The CA adjustment ,
R145, has no effect.
2-Amplifier Wye Connection: Set the two amplifier
outputs, ENA and ENB, to 120V. Adjust BA, R148, until
the line-to-line voltage, EAB, equals 207,84 volts, The
CO adjustment, 8145 has no effect,
3-Amplifier Wye Connection: Set all the amplifier
outputs, ENA, ENB and ENc, to 120V. Adjust BA, R148,
for line-to-line voltage EAB equals to 207,84 volts.
Adjust CO, R 145, for line-to-line voltage EAC equal to
207.84 volts.
2-Phase Connection: Set both amplifier outputs to
120V. Adjust V, R148, until line-to-line voltage EAB
equals 169,71 volts.
4-2
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SERIES 400
SECTION V
PARTS LIST
SECTION V
5-1
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SECTION V
SCHEMATIC
DESIGNATION VALUE
DESCRI PTI ON
OR TYPE RATING
MANUFACTURER
NAME PART NO.
PARTS COMMON TO ALL OSCILLATORS
CAPACITORS
C102, C 107 SEE TABLE POLYCARB 100V 5% IMB BR , . . F
C103, C 108 SEE TABLE POLYCARB 100V 5% IMB BIA . . . F
C104, C 105, 0.0015 uf CER DISC ERIE 811Z5V152P
C109, C 110
C106, C 112 '0.001 uf CER DISC ERIE 811Z5V102P
C113, C 115 100 uf ELECT 25V SPRAGUE TE1211
C114 0.01 uf CER DISC ERIE
RESISTORS
R108, R 118 SEE TABLE MET FILM 1/8W 1% TEXAS INST. RN60C
R109, R 119 SEE TABLE MET FILM 1/8W 1% TEXAS INST. RN60C
R110, R 120 SEE TABLE MET FILM 1/8W 1% TEXAS INST. RN60C
R111, R 114, R 117, 2.2K CARB COMP 1/2W 5% OHMITE
R121, R 124, R 127,
R133, R 131 1.2K
R112, R 122 100K CARB COMP 1/2W 5% OHMITE
R113, R 115, R 123, 470 CARB COMP 1/2W 5% OHMITE
R125
R116, R 126 1K CARB COMP 1/2W 5% OHMITE
R128, R 135 47 CARB COMP 2W 5% OHMITE
R129, R 130, R 131, 4.7K CARB COMP 1/2W 5% OHMITE
R134, R 137
R132 1.5K CARB COMP 1/2W 5% OHMITE
R136 220 CARB COMP 1/2W 5% OHMITE
R138, R 139 10K CARB COMP 1/2W 5% OHMITE
R114 750 CARB COMP 1/2W 5% OHMITE
SEM1 CONDUCTORS
Q104, Q 105, Q 107, 2N3565 TRANSISTOR FAIRCHILD
Q108, 0 110
Q 106, Q 109, CR 107, 2N3638 TRANSISTOR FAIRCHILD
CR 108, CR 109, Q 114
Q111, Q 112 40250V 1 TRANSISTOR RCA
Q113 S17889 TRANSISTOR FAIRCHILD
O105, Q 108 2N4356 FAIRCHILD
2N3567
SERIES 400
5-2
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SERIES 400
SCHEMATIC
DESIGNATION VALUE
_
DESCRI PTI ON
OR TYPE RATING
MANUFACTURER
NAME PART NO.
PARTS PECULIAR TO 0.1% OSCILLATORS
CAPACITORS
C101
RESISTORS
R101
R102
R103, R 104, R 106
R105
R107
R140
SEMI CONDUCTORS
Q101, CR 101
Q102, Q 103
CR 102, CR 103
4.7
2.2K
15K
4.7K
680
3.3K
500
2N3638
2N3565
1N457
TANT
CARB COMP
CARB COMP
CARS COMP
CARB COMP
CARS COMP
TRIMPOT
TRANSISTOR
TRANSISTOR
DIODE
35V
I/2W 5%
1/2W 5%
1/2W 5%
1/2W 5%
1/2W 5%
SPRAGUE
OHMITE
OHMITE
OHMITE
OHMITE
OHMITE
BOURNS
FAIRCHILD
FAIRCHILD
SYLVAN' A
CS13-BF475M
275-1-501
PARTS PECULIAR TO 0.0001% OSCILLATORS
OSCILLATOR
OSC
RESISTORS
R101
R106
R107
R160
SEMI CONDUCTORS
CR 101- CR 105
CR 106
Q103
OSCILLATOR
250
270
1000
470
1N4818
2N3638
2N3643
UL 923
MODULE - SEE TABLE
WW
CARB COMP
CARS COMP
CARB COMP
DIODE
TRANSISTOR
TRANSISTOR
FLIP-FLOP
FOR FREQUENCY
IOW
1/2W 5%
1/2W 5%
1/2W 5%
1A200V
See Table A
for Number
I
WARD-LEONARD
OHMITE
OHMITE
OHMITE
WESTINGHOUSE
FAIRCHILD
FAIRCHILD
FAIRCHILD
10XM250
SECTION V
5-3
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SECTION V
SCHEMATIC
DESIGNATION VALUE
DESCRIPTION
OR TYPE RATING
MANUFACTURER
NAME I PART NO.
PARTS PECULIAR TO 0.01% OSCILLATORS
CAPACITORS
C101 0.01 of CER DISC ERIE 811Z5V10 3P
RESISTORS
R101 250 WW 10W WARD-LEONARD 10XM250
R102 33K CARS COMP 1/2W 5% OHMITE
R103 3.3K CARE COMP 1/2W 5% OHMITE
R104 10K CARS COMP 1/2W 5% OHMITE
R105 470 CARS COMP 1/2W 5% OHMITE
R106 270 CARS COMP 1/2W 5% OHMITE
R107 1K CARS COMP 1/2W 5% OHMITE
SEMI CONDUCTORS
CR 101-CR 105 1N4818 DIODE WESTINGHOUSE
Q101, W102, Q 103 2N3643 TRANSISTOR FAIRCHILD
CR 106 2N3638 TRANSISTOR FAIRCHILD
UL923 FLIP-FLOP See Table A
for Number
FAIRCHILD
MI SCELLANOUS
X1 CRYSTAL See Table A
for Frequency MONITOR
PARTS PECULIARTO 2 & 3 PHASE OSCILLATORS
RESISTORS
R140 5.1K CARS COMP 1/2W 5% OHMITE
R141 10K CARS COMP 1/2W 5% OHMITE
R142 4.7K CARS COMP 1/2W 5% OHMITE
R143, R 144 1K CARS COMP 1/2W 5% OHMITE
R150, R 152 500-1K
R145, R 148 10K TRIMPOT IRC
R146 See Table A MET FILM 1/8W 1% TEXAS INST
R147 See Table A MET FILM 1/8W 1% TEXAS INST
R149 475 MET FILM 1/8W 1% TEXAS INST RN60C4750f
R151, R 153 2.2K CARB COMP 1/2W 5% OHMITE
CAPACITORS
C116 220uf TANTALUM 10y SPRAGUE 1965227X001068
C117 See Table A
C118 See Table A
SERIES 400
5-4
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SERIES 400
SCHEMATIC
DESIGNATION VALUE
DESCRIPTION
OR TYPE RATING
MANUFACTURER
NAME PART NO.
PARTS PECULIAR TO 2 & 3 PHASE OSCILLATORS
SEMI CONDUCTORS
Q115
Q116, Q 118, Q 120
Q117, Q 119
TRANSISTOR
TRANSISTOR
FET
FAIRCHILD
FAIRCHILD
AMELCO
2N3567
2N3638
2N4302
FREQUENCY XIAI
NO. OF
UL923 USED R108/11118 RI09/R(19 R110/11120 C103/C108 C102/C107 R146 C117/C118 8147
50 102,4(Hz 11 19.6K 9.53K 6.34K 2uf 0.082 uf IK 0.33 11,50K
60 122.88KHz 11 16.2K 7.87K 5.11K 2uf 0.082 uf IK 0.33 8.06K
400 102 ,4KHz 814.3K 7.15K 4.75K 0.33 uf 0.012 uf 1K 0,047 8.06K
800 102.4KHz 715K 7.87K 5.11K 0,15 uf 0.0068 uf 1K 0.022 11.50K
3200 102,4KHz 56.04K 3.01K 2.00K 0.1 u f 0.0039 uf 1K 0.0047 11,50K
4800 153. 6KHz 54.02K 2.00K 1,33K 0.1 uf 0.0039 uf IK 0.0047 8,06K
All 2-phase oscillators use 4,75K for R147
SECTION V
TABLE A
5-5
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WARRANTY
Elgar Corporation warrants each instrument it
manufactures to be free from defects in material
and workmanship. The corporation's obligation
under this warranty is limited to servicing the
instrument and replacing defective parts, when
the instrument is returned to the factory and trans-
portation charges pre-paid. This warranty is effec-
tive for one year after delivery of the instrument to
the original purchaser. Defects caused by improper
operating conditions, misuse, negligence, or the
alteration or removal of the nameplate, will void
the warranty. Elgar Corporation shall in no circum-
stance be liable for any direct or consequential loss
or damage of any nature resulting from the mal-
function of the instrument. This warranty is effec-
tive in lieu of any or all other obligations or liabilities
on the part of Elgar Corporation, its agents, or
representatives.
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[4i Lem A F`?
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