YOKOGAWA 3142 User manual

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INSTRUCTIONS
INSTRUCTION MANUAL
FOR
AC-DC CONVERTER
TYPE 3 I 42
Edit. 4-

YEW
INSTRUCTION MANUAL
FOR
AC-DC CONYER TER
TYPE
3142
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YOKOGAWA ELECTRIC
WORKS. LTD.

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YEW
- CONTENTS -
Page
l . GENERAL DESCRIPTION . . . . . . • . • . . . . • . . . . . . • . . . . . . . . l
2.
FEATURES
I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 1 I 1 1 1 l
3. SPECIFICATIONS ......... I ••••••••••••••••••••• I • • • • 1
4. METHOD OF OPERATION . • . . • • • • • . . . . • . . . . . . . . . • . . . . 3
5. OPERATIONAL FUNCTION
I I I I I I I I I I I I I I I I I 1 I 1 I 1 1 1 1 1 4
6. EXPLANATION OF CONSTRUCTION AND OPERATION • . . 5
7. ADJUSTMENT ... I •••• I ••••••• ' ••••••••••••• I •• I •••• I 6
8. SELECTION OF GALVANOMETER AND RECORDING
SENSITIVITY ............... I ••••••••••••••• I • • • • • • • • 7
9. CAUTIONS FOR USE . . . • • . . . • • • . . . . . . . . . • . • • • . . . . • . . . 8
CIRCUIT DIAGRAM AND LIST OF PARTS
YOKOGAWA ELECTRIC WORKS, LTD.

YEW
P,
1 . GENERAL DESCRIPTION
This equipment is manufactured as auxiliary equipment for the
Photocorder (namely YEW Electromagnetic Oscillograph),
This AC-DC Converter uses the G-l?OB GALVANOMETER to
convert AC voltage to DC current and record on the electro-
magnetic oscillograph.
This equipment converts sine wave voltages of frequency 30 Hz to
1
20 kHz to 1. 5 rnA direct current. According to the current sensitivity
of the galvanometer, with the use of the Type G-l?OA galvanometer,
recording of about 200 mm is possible,
This equipment is also de signed to extract 1Om V output by using a
slide switch as an accessory to the X- Y recorder,
In addition, there is another AC-DC Converter (Type 3147) in our
product line, of the peak value rectifying type, with excellent
linearity and frequency characteristics,
2, FEATURES
The features of this equipment are as follows:
1) The rectifying type is half-wave rectification, By using a
negative feedback amplification, excellent linearity is obtained.
2) The operation of this equipment is very stable, since it is
entirely transistorized.
3) It can serve as an accessory to a servo-recorder as well as
electromagnetic oscillograph.
4) It can measure up to a maximum of 250V I 20cm, since a
correcting attenuator is provided in the input circuit,
I 3. SPECIFICATIONS
Rectifying type: Half-wave rectification
Voltage scale range:
10, 25, 50, 100, 250 m VI em
0,5, 1, 2,5, 5, 10 and 20 V/cm m 11 ranges
I
Frequency characteristics of amplitude:
I
b= __ jYOKOGAWA
Within ±1 o/o of output full
to 20kHz
scale at 30 Hz
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WORKS,
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Maximum output DC current and voltage:
l. 5mA (maximum), when using
(GALVANOMETER) side.
lOmV (maximum), when using
(XY RECORDER) side.
Linearity: Within ±l% (at 30 Hz to 20 kHz of full scale
Accuracy of amplitude: ±l% (at 20°C ±5o C)
Impedance:
Input impedance;
Input capacity;
Output impedance;
Approximately l 00 kn
Less than 50 pF
Approximately l kr2, when using
(GALVANOMETER) side.
Approximately lOOn, when
using (XY RECORDER) side.
Response: In the even of -recording on an direct-
recording electromagnetic oscillograph,
rise time for 90% is 0. 5 sec,
Influence of power fluctuation on output:
Within ±0. 5% within respect to power
fluctuation of lOOV ±10%,
Ambient temperature range:
Noise:
Meter:
Power supply:
Power consumption:
Transistor:
Within P-P SOf-LV of the output when the
input circuit is short circuitted,
By selection, outputs of 1, 5mA and l OmV
can be read from the DC lOOf-LA ammeter
100 VAC ±lOY, 50 Hz, 60Hz
Approximately 7VA
Amplifier section
Power supply section
2SA603 (x 4)
2SA546 (x l)
2SB463 (x l)
2SA603 (x l)
Dimensions and weight: Approximately 87,5 (width)mm
Accessories:
216 (height)mm 400(depth)mm
Approximately 4, 5 kg
Instruction manual 2 copies
Test report l copy
Power cord
l ea.
Fuse
2 ea.
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YOKOGAWA ELECTRIC WORKS, LTD.

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4. METHOD OF OPERATION
1) Power on
For the power supply, lOOV (50 Hz or 60Hz) is used, turn the
power supply switch to the "on'
1
position, following the connection
to the power receptacle, so that the equipment immediately
starts operating since it is entirely transistorized,
2) Insert the AC input to be measured into the input connecting
terminal of the front panel,
3) Set the slide switch of the rear panel approximately, depending
on whether the output is recorded by electromagnetic oscillo-
graph or by X- Y recorder.
4) Adjust the input signal so that the output met~r '1 VOLT SCALE"
will indicate within 1, 5mA (red line) in case of recording by
the X-Y recorder, within lOmV (blue line)
5) Because current sensitivity of galvanometer (G-170B) is ±1 Oo/o
a precision, that error is calibrated by GALV CAL of the
front panel,
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LTD.} __ ----·-

YIW P. 4
5. OPERATIONAL FUNCTION
Fig. 1 Front and rear panels
1) Front panel
•
In the output meter, the upper side of the scale indicates mA
output, and the lower side the m V output.
VOLT SCALE
Each step indicates the input voltage for the length on the output
recording paper, by means of the input voltage attenuator.
INPUT
Input connecting terminal.
YOKOGAWA ELECTRIC WORKS, LTD .
6

YIW
P, 5
GALV CAL
For the calibration of current sensitivity of galvanometer (G-170B)
ONJ OFF
Connection of power supply circuit.
2) Rear panel
OUTPUT
Output connecting terminal,
100 VAC
Connector used when applying an 100 VAC power line as the
power supply.
6. EXPLANATION OF CONSTRUCTION AND OPERATION
RECTIFIER
0--
INPUT
HIGH INPUT
INPUT
IMPEDANCE
AMPLIFIER
, ~
0--
ATTENUATOR
r-
fr
CIRCUIT t
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Fig. 2 Diagram of construction
(Input attenuator)
•
The input impedance is 100 k!JJ with the voltage ratio in 11
ranges from lOmV/cm to 20V/cm,
YOKOGAWA ELECTRIC WORKS, LTD .
OUT
PUT

YEW
(High input impedance circuit)
The circuit employs the Darlington connection for input
transistors, thus increasing the AC input impedance; the
P, 6
input impedance at the normal temperature is more than lMfJ,
(Amplifier)
Though the amplification factor is reduced, the equipment uses
a negative feedback amplifier, thus obtaining a flat gain with
respect to the frequency change from approximately 30Hz to
20 kHz and also the linearity to the nonlinearity of the diode
rectification, The half-wave rectified voltage becomes output,
and the combined sine wave is negatively fed back and is thus
provided with linearity.
7. ADJUSTMENT
After finishing the adjustment the test results were recorded.
However, should a trouble be encountered or an accurate measure-
ment be required, the following adjustment should be performed:
All the adjusting portions are concentrated on the printed circuit
board EEW-323A and Front panel, and the associated adjustment is
performed by the following three volume controls.
RVl
RVZ
RV3
Output regulated volume (at the X- Y recorder side)
Output regulated volume (at the GALVA side)
DC power supply voltage regulated volume
Adjustment of R V3 (set on printed circuit board)
R V3 should be adjusted so that the DC power supply voltage
becomes - 24V with the load connected.
Adjustment of RVl (set on printed circuit board)
At the rangeof lOmV/cm of the "VOLT SCALE", apply sine wave
input of 0. ZV, 1 kHz, to the input terminal and connect the X- Y
recorder to the output terminal, and calibration should be made
so that deflection of 20 em can be made at the 0, 5m VI range.
Adjustment of R VZ (set on front panel)
Apply the sine wave of 0. ZV, 1 kHz, to the input terminal at the
range of lOmV/cm of the "VOLT SCALE'
1,
and connect the DC
ammeter to the output terminal (GALVANOMETER side); adjust
the R VZ so as to obtain approximately 1. 5mA. But R VZ is used
to caribrate the sensitivity of each galvanometer.
YOKOGAWA ELECTRIC WORKS. LTD.

YEW
P, 7
8. SELECTION OF GALVANOMETER AND RECORDING SENSITIVITY
Galvanometer Type G-170B, the products of YEW, are the most
suitable ones for this equipment, This type have sensitivity of
20 em deflection at the current sensitivity when using the external
damping resistance at 1. 5mA output, thus permitting use of the
(VOLT SCALE) of the front panel as it is,
The characteristics of other types, such as the G-lOOA and G-170C
galvanometers, are given below;
Flat (±5%)
Current
Nominal
Required
Maximum
Linearity
Type
Frequency
Sensitivity
Coil
External Saje Within
Damping Allowed
Number
Response
Resistance
Resistance
Current Detlection
C/s
)JA/m,
1l n
mA
mm
G-100A
50 1. 25
3 3 12 0 I I0 0
G -170 B I0 0 3.3 22
17 1
10 0
G -170 C 10 0 2.0 75 93 1
10 0
Galvanometer characteristics.
The above describes the characteristics of the galvanometer,
The following list shows the overall characteristics when using the
Type 3 142
Coil Current Input
Of
3t4Z
Coil Current
Type
o.t f.SrnA OutpUi
Voltage
(With the dampiWJ Type 2'?02
Multiplier
Number
resistance
oJ Type zqoz
insterted)
)JA
)JA/2ocm
Indication
6"- IOOA 11 7 0
25 0 4
G-1708
654 6b 0 10
G--l70C 8 3 0
400
5
Characteristics of
this
equjpment
used
with the galvanometer.
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