Motorola S1051C User manual

MOTOROLA INC., COMMUNICATIONS DIVISIÓN - INSTRUCTION MANUAL
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MOTOROLA trans istorized voltmeter
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68P81021A05-C

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AEPD-9830-O(CE2286-V21)
05 MOTOROL
MOTOROLA
MOTOROLA
TRANSISTORIZED
AC
VOLTMETER
A
MODEL 51053С
TRANSISTORIZED AC VOLTMETER
INC.
MODELS 51051С AND S1053C
COMMUNICATIONS DIVISION
ENGINEERING PUBLICATIONS
Copyright 1973 by Motorola, Inc.
Printed in WS. A.
2/27/73-UP
1301 E. ALGONQUIN ROAD
SCHAUMBURG, ILLINOIS 60172
68P81021A05
Issue - C

GUARANTEED
PERFORMANCE
SPECIFICATIONS
MODELS $1051C $1053C
(battery operated) (a-c/battery operated)
MEASUREMENTS 1 millivolt to 300 volts full scale on 12 ranges. -72 db to +52 db on
12 ranges.
+2% of full scale from 50 cps to 300 kc and
+3% of full scale from 20 cps to 50 cps, 300 kc to 1 mc;
except £376 of full scale from 20 cps to 100 kc and +5% of full scale
from 100 kc to 1 mc on the 300 volt range (at 259C (779F)).
1 to 300 mv range; greater than 1 megohm shunted by 30 uuf.
ШОШ ЫОМЕ E UE 1 {о 300 volt range; greater than 10 megohms shunted by 15 uuf
OVERLOAD VOLT range: Maximum of 550 volts (sum of d-c and a-c peak voltages)
PROTECTION MILLIVOLT range: Maximum of 110 volts rms continuous; 220 volts
rms for 10 seconds or less; 600 v d-c
NOISE Less than 0.1 mv meter deflection with input terminated with 100K
ohm resistor (shielded) on 1 mv range
METER
Linear voltage scales: 0-1 and 0-3 (calibrated to rms values of a sine
CALIBRATION
ACCURACY
wave)
Voltage ranges: 1, 3, 10, etc. steps
DB scale calibration: -12 to 42
Zero level: 1 milliwatt in 600 ohms
0-50 microampere taut-band movement
AC INPUT REQUIRE- 105-130 v а-с, 50-400 cps at approximately 5 ma; or, using SKN6009A
MENTS (51053С ONLY) 230/117 v a-c adapter cable kit, 230 v a-c, 50-400 cps
DC
INPUT
An
8.4
volt
mercury
battery
(Mallory
No.
TR-136
or
equivalent)
REQUIREMENTS
BATTERY LIFE Used as a ЕДЕН; Зоро шау 400 hours
Used as an amplifier: approximately 300 hours
METER
Output
voltage
(at
400
cps):
Proportional
to
input
voltage
as
indicated
by
meter
deflection
(meter
and
amplifier
are
separate
functions
and
cannot
be
used
simultaneously),
1.4
volts
(peak
to
peak)
or
0.5
volt
(rms)
into
600
ohm
(or
more)
resistive
load
corresponding
to
full
scale
meter
reading.
AMPLIFIER
CHARACTERISTICS
Frequency response: +0.5 db from 20 cps to 100 kc, approx. 3 db down
at 1 mc into 600 ohm or more (resistive load) and shunt capacity not
more than 200 uuf,
Distortion
(20-30*C):
Less
than
1%
with
ІК
ohm
(or
more)
resistive
load
shunted
by
not more
than
200
uuf
from
20
cps
to
20
kc.
Maximum
voltage
gain
(400
cps):
500
(54
db)
on
1
mv
range
WEIGHT
6
1b.
7
oz.
DIMENSIONS
10-1/4"
x
6-1/2"
x
5-3/4"
(approx.)
SPECIFICATIONS
SUBJECT
TO
CHANGE
WITHOUT
NOTICE
ii

MOTOROLA
MODEL CHART
TRANSISTORIZED AC VOLTMETERS
DESCRIPTION
[x]
Ш
ITEM INCLUDED
230/117 V ADAPTER CABLE KIT BATTERY KIT
OPTIONAL ACCESSORY
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MODEL DESCRIPTION MODEL
51051С PORTABLE, BATTERY POWERED SLN6013C Ој |
51053С PORTABLE, BATTERY AND АС POWERED SLN6045C o| xl
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iii

FOREWORD
CLAIM FOR DAMAGE IN SHIPMENT
If any damage to the shipping container is ap-
parent upon receipt, the delivering driver should
be requested to note such damage on all copies of
thefreight bill. This is for your protection should
the material have received damage.
The equipment should be unpacked immedi-
ately, examined for damage and tested. ЊЕ. GUE
fails to operate properly, or is damaged in any
way, а claim should be filed with the carrier.
The claim should be filed within 48 hours after
receipt, if possible, or during a period not to
exceed 15 days.
A full report of such damage should be ob-
tained from the claim investigator, who will call
upon you. For the purpose of this report, the
shipping container and all packing materials
should be retained for the investigator to examine.
Тһе investigator's report should then be for-
warded to:
Motorola Communications & Electronics, Inc.
Parts and Service Department
1301 E. Algonquin Road
Schaumburg, Illinois 60172
Include model number and serial number
when referring to the instrument for any reason.
iv
Arrangements for repair or replacement will be
made and you will be advised of the disposition of
the instrument.
REPAIR AND/OR RECALIBRATION
Because of its complexity it is recommended
that the instrument be returned to the factory for
repair and/or calibration. Return to:
Motorola Communications & Electronics, Inc.
Parts and Service Department
1301 E. Algonquin Road
Schaumburg, Illinois 60172
Before shipping the instrument notify the De-
partment at the above address of the service re-
quired. Refer to the instrument by model number
and serial number. On receipt of the information,
you will be informed of shipping instructions. If
requested, an estimate of the charges will be made
before work begins, provided the instrument is
not covered by the warranty.
SHIPPING
The unit employs а meter movement which,
though electrically rugged, should be protected
from mechanical shock. Therefore, the instru-
ment should be surrounded by three inches of
excelsior or similar absorbing material and then
packed іп а strong exterior container. It should
be shipped via truck, railway express, air freight,
or air express. Тһе instrument should not be
handled roughly during packing.

WARRANTY
This Motorola instrument is guaranteed by
Motorola for a period of one year after delivery
tothe original purchaser against defects in design,
material, and workmanship. Our liability under
this warranty is limited to servicing or adjusting
anyinstrument returned tothe factory Service De-
partment for that purpose and to replace any de-
fective parts thereof.
This warranty is effective for one year after
delivery to the original purchaser when the in-
strument is returned, transportation charges pre-
paid by the original purchaser, and when upon
our examination it is disclosed to our satisfaction
to be defective. If the fault has been caused Бу
misuse or abnormal conditions of operation, re-
pairs will be billed at the net price of necessary
parts and а service charge at Motorola's then pre-
vailing labor rate. Іп this case, an estimate will
be submitted before the work is started.
This warranty i in lieu of all other warran-
ties, expressed or іпірПей and all other obliga-
tions or liabilities on Motorola part.
If any fault develops, the following steps should
be taken:
1. | Notify us at the following address:
Motorola Communications & Electronics, Inc.
Parts and Service Department
1301 E. Algonquin Road
Schaumburg, Illinois 60172
Give full details of the difficulty, and include
Upon receipt
of this information, we will give you service data
or shipping instructions.
model number and serial number.
2. Троп receipt of shipping instructions, for-
ward the instrument prepaid to the above address,
or to the authorized repair station indicated on
the instructions. If requested, an estimate of
the charges will be made before the work be-
gins, if the instrument is not covered by the
warranty.

SECTION
Guaranteed Performance Specifications
NiodelChbsrte 2 22%
INTRODUCTION . . .
DESCRIPTION . . . .
Functions , ,
а.
b.
С»
а.
Instrument Characteristics
Construction
o
о
AC Power Supply
METER SCALES, . . ,
CONTROLS AND INPUT TERMINATIONS
a. AC Voltage Scales
bi
Ce
а.
b.
с.
d.
e.
[2
ge
Decibel Scale,
Battery Condition Scale
Range Selector Switch ,
OFF-B+ CHK, -METER-OUTPUT
OFF-B+ CHK, METER-OUTPUT
Input Terminations.
Output Termination,
Test Lead Accessory ,
230/117 Volt Adapter Cable
CIRCUIT DESCRIPTION
Input attenuation.
Pre-Amplifier
Amplifier. .
Output Stage .
а.
or
с.
d.
e
f
Meter Circuit
Power Supply (S1053C Only)
OPERATION . . . .
Mechanical Meter Zero
Operation from an AC Source
Operation from Internal Battery
а.
b.
Co
d.
e.
"e
p
h.
AC Voltage Measurement
о
Power Measurements .
Examples of AC Voltage and Power
Amplifier Operation
Battery Conservation
TEMPERATURE EFFECTS
APPLICATIONS . .
CALIBRATION AND MAINTENANCE
SCHEMATIC DIAGRAMS AND PARTS LIST
а.
b.
с.
а.
Dis
с.
а.
b.
General а
Voltmeter.
Amplifier .
General =
Calibration
.
Troubleshooting .
Model $1051C
Model 51053С
.
.
ө
о
Functions
CONTENTS
° ° . . .
. . . . .
. o . . °
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. . o . .
. . . о .
. . e . .
. е о . е
. ° ° ° °
. . . . .
. . ° ° °
° ° . . .
О . о . .
. . o
Functions
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Measurements
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Se Ame e
Switch (Model S1051C),
Switch (Model 51053С),
PAGE
ii
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15
16

1. INTRODUCTION
The Motorola Transistorized AC Voltmeters
offer many advantages not found in a-c vacuum
tube voltmeters. Small physical size, light
weight and full transistorization permit com-
plete portability for field use. Тһе absence
of heat producing elements, such as tubes and
transformers, lessens the need for frequent re-
calibration and increases component life, The
.Model S1051C.is battery operated. The Model
„ 51053С, in addition to being battery operated, con-
tains an a-c power supply which operates froma
117уа-с, 50-400 срв source. A detachable power
cord is supplied with the Model 51053С. Тһе
SKN6009A 230/117 Volt Adpater Cable Kit (an op-
tional item not furnished with the standard Model
$1053C) permits operation from а 230 volt, 50-
400 cps power source.
2. DESCRIPTION
а. Functions
These transistorized a-c voltmeters are ca-
pable of accurately performing the following func-
tions:
(1) AC voltage measurement from 0.1 milli-
volt to 300 volts in а frequency range of20 cycles
per second to 1 megacycle.
(2) Power measurements from -72 to +52
dbm when measured across 600 ohm impedance
(0 dbm - 1 milliwatt into 600 ohms).
(3) Comparative power measurements from
-72 to +52 db (when measured at the same imped-
ance level).
(4) High gain isolation amplifier with high
input resistance and low impedance output for amp-
lification of low level audio or r-f signals.
b. Instrument Characteristics
This instrument is similar to many other a-c
voltmeters in that the meter movement responds
to average values of applied voltages. The meter
Scale is calibrated to read the rms value of a
sinusoidal waveform. When the input waveform
departs from a pure sine wave, the meter indica-
tion will be in error by the ratio of the average
value to the rms value of the incoming waveform.
(See figures 1 and 2 in paragraph 8.)
c. Construction
Although primarily designed for laboratory
use, these instruments, being self-powered, are
quite suitable for portable use without sacrificing
the accuracy or versatility ofalaboratory instru-
ment. A detachable metal cover protects the front
panel from damage that might occur in portable
use. Clips for storing the meter cable or other
accessories are mounted on the inside of the cov-
er;
d. AC Power Supply
The power supply of the Model 51053С con-
tains a conventional half-wave diode rectifier cir-
cuit with а capacitor input filter connected to the
output. А Zener diode is connected across the
output for voltage regulation. The input step-down
transformer is installed in the line cord circuit
and isolates the instrument case from the a-c
source, Тре ground pin of the line cord is not
connected to the instrument case. Тһе line cord
is detachable when portable operation with an in-
ternal battery is desired.
3. METER SCALES
The meter is calibrated in two linear a-c
voltage scales, a decibel scale anda battery con-
dition scale, It uses а 0-50 microampere taut-
band movement with non-linearity less than 19
of full-scale deflection. Damping is adjusted to
eliminate 'overshoot'' for convenience in reading
the pointer indication. The meter scales and their
applications are as follows:
a. AC Voltage Scales
The two linear scales (black) are used to mea-
sure rms values of a-c voltages, The upper scale
is graduated to a full-scale value of 1.0 and the
lower scale is graduated to a full-scale reading
of 3.2. АП a-c voltages from 0. 1 millivoltto 300
volts rms are read directly from these scales
using the full scale factors appearing onthe range
selector switch positions.
b. Decibel Scale
The DECIBEL scale (red) is used for dbm
measurement when measuring power level into а
600 ohm impedance or comparative db levels when
measured at the same impedance level. The scale

VOLTS ¢
MILLIVOLTS ۾󰾯
A
INPUT
ATTENUATOR
PRE-
AMPLIFIER
SECOND
ATTENUATOR
А OUTPUT
O—]RECTIFIER
OUTPUT
STAGE OUTPUT
AMPLIFIER
BLOCK DIAGRAM
is calibrated from -12 to 42 and readings are ob-
tained by using the algebraic sumofthe range se-
lector switch position and the meter pointer indi-
cation.
c. Battery Condition Scale
Тһе LINE OR BATTERY O.K. scale (red) is
the small scale above and to the rightofthe upper
a-c voltage scale. The meter pointer indication
within the scale limits is а relative indication of
battery condition (under load) or of the a-c power
supply output.
4. CONTROLS AND INPUT TERMINATIONS
All controls and input terminations used for
measurement are located on the front panel ofthe
instrument,
a. Range Selector Switch
This is а 12-position switch used to selectthe
proper voltage or decibel range. Тһе correct
Switch position is determined by the level applied
to the input.
b. OFF-B+ CHK, -METER-OUTPUT
Function Switch (Model S1051C)
This switch permits a check of the internal
battery condition under load in addition to turn-
ing the instrument on or off, The meter is con-
nected to the battery under a simulated load when
the switchis placedinthe B+ CHK, position. Volt-
age measurements may be made in the METER
position. Amplifier output is connected to the
front panel BNC connector in the OUTPUT posi-
tion.
с. OFF-B+CHK,-METER-OUTPUT
Function Switch (Model S1053C)
This is an 8-position (continuous rotation)
switch which performs four functions: OFF, Bt
CHK., METER and OUTPUT (see photograph on
frontispiece of this manual). The markings on
the knob (pointer marks labeled LINE and BATT)
automatically indicate whether the internal bat-
tery or the a-c line is in use as a power source.
METER and OUTPUT functions are the same as
those described in the preceding paragraph.
d. Input Terminations
The units are equipped with two binding posts
that are mounted on a molded polystyrene base se-
lected for its low loss characteristics at high fre-
quencies. These 'six-way''binding posts are used
to make electrical connections with single and
double pin banana type plugs, tipped plugs, spade
lugs, alligator clips and bare wire.
e. Output Termination
The units are equipped with a BNC coaxialre-
ceptacle which is mounted on the front panel. This
receptacle furnishes amplifier output for external
applications when the function selector switch is
in the OUTPUT position.
WARNING
The voltmeters have the GND terminal
connected to the instrument case. Ex-
treme caution should be exercised when
connecting this terminal to off ground
potentials (referenced to ground of the
circuit being measured) to minimize
shock hazard to operating personnel.
When high d-c potentials are present,
connect а large coupling capacitor in
series with this terminal and a l-meg-
ohm resistor between this terminal and
referenced ground of the circuit being
measured.
f. Test Lead Accessory (Optional Accessory)
The SKN6001A Meter Cable Kit is available
as an optional test lead accessory. It is а 30"
shielded cable terminated at one end in a standard
two-pin banana plug. The probe end of the cable
is terminated in two insulated alligator clips.
BEPD-9635-O