Hitachi V-151F User manual

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Model V-151F
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OSCILLOSCOPE
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OPERATION MANUAL
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WARRANTY
This Hitachi Denshi, Ltd. product is warranted against defects in workman
ship and materials. If any failure, resulting from a defect in either workman
ship or material, shall occur under normal use within two years from the
original date of purchase, such failure shall be corrected free of charge to the
original purchase by repair or, at Hitachi Denshi's sole option, replacement of
the defective part or parts. No charge shall be made for labor or services
performed during said two years period providing the product is brought to
our Authorized Service Station.
Hitachi Denshi, Ltd. will either repair or at its sole option, replace any part
except for cathode ray tube, fuses, probes, lamps, batteries and other op
tional materials which are defective in either workmanship or material under
normal and proper use.
This warranty does not cover equipment which has been tampered with in
any way, or damage caused by accident, negligence, alteration, or misappli
cation.
This product must be returned transportation prepaid, properly packed and
insured. This warranty applies only to the original purchaser.
NO OTHER WARRANTIES ARE EXPRESSED OR IMPLIED. Hitachi
Denshi, Ltd. IS NOT LIABLE FOR CONSEQUENTIAL DAMAGES.
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CONTENTS
Page
1. Introduction 1
1.1 Outline 1
1.2 Specifications 1
1.3 Composition 3
2. Operation 4
2.1 Description of Panel Functions 4
2.2 Precautions 9
2.3 Fundamental Operation Instructions lo
3. User Adjustments 16
4. Applications 17
4.1 Measurement of rise (fall) time 17
4.2 Measurement of Composite video signal 18
5. Schematic Diagrams 2o

NOTE
o This Instrument should be adjusted at an ambient temperature
of +20°C for best overall accuracy.
Allow at least 15 minutes warmup before proceeding.
o Polyvinyl chloride (PVC) film is attached on the enclosure
and the front panel of the oscilloscope to protect the metal
surface. If the PVC film is damaged by scratches, remove it.
o To clean the enclosure or the front panel, use neutral deter
gent. Refrain from using thinner, benzine, alcohol or other
chemicals.
o For safety operation, the instrument chassis and cabinet be
sure to connect the ground lead of the GND (ground) terminal
to earth ground, if a two-wire AC power system is used.
Failure to complete the ground system may allow the chassis
and cabinet of this instrument to be elevated above ground
potential and pose a shock hazard.

1. Introduction
1.1 Outline
Model V-151F is a single trace oscilloscope with a
bandwith of DC-15MHz and sensitivity of ImV/DIV
(Pulled x5 Gain). The time base provides a maximum
sweep speed time of 0.2uS/DIV. When magnified by
10, the sweep speed is lOOnS/DIV. High accelerated
voltage CRT, with 8 x iqdiv effective display area
and post acceleration, enables high speed pulses to
be clearly displayed.
Engineered for service in the field of television,
VTR, and computer, the V-151F is portable, easy and
features convenient operation for use in education
and industry.
o Wide bandwidth and high sensitivity
In addition to wide bandwidth, DC-15MHz, (-3dB)
this instrument provides high sensitivity of 5mV/
DIV. A 15 MHz frequency is obtained with im
proved triggered synchronization.
o Bright CRT
By using a new, highbrightness CRT, a stable ac
celerated CRT high voltage, calibration voltage
accuracy, and time base are obtained.
o TV Synchronization
A circuit for extracting the synchronizing signal
is equipped to trigger easily with a composite
video signal. TV vertical or horizontal sync
signal is automatically selected by the time base
switch.
o Improvement in portability and operation
Equipped with a convenient carrying handle and
designed for light weight, this unit is excellent
both in portability and operation with various
functions installed on the front panel.
o X-Y functions
Set the switch to X-Y.position and X-Y oscillo
scope is displayed with EXT TRIG OR [x] IN as X
axis and INPUT as Y axis.
1.2 Specification
CRT Display
Type 130BUB31
Acceleration Voltage 2kV
Effective display 8 x lO DIV (1 DIV=9.5m)
area
Vertical amplifier 5mV/DIV ~ 5V/DIV
Sensitivity: Calibrated in 10 steps (1-
2-5 Sequence up to about

Bandwidth
Rise time
Input impedance
Input coupling
Max. Input voltage
Input connector
CHI output
Output voltage*
Bandwidth*
Output Noise*
2.5 times on each position
with variable control)
* ImV - IV/div (using x5 GAIN)
DC to, 15MHz
DC to 5MHz (using x5 GAIN)
Typical 24ns
IMn shunted by 30pF +5pF
(direct)
AC, GND, DC
600Vp-p, 300V (DC+AC peak)
BNC
20mV/div Min.
50Hz-5MHz(-3dB)(at xl GAIN)
lOmVp-p Max.
* Measured by Im 50-ohm BNC Cable with 50—ohm
terminator.
Approx. 50f2
AC
Output impedance
Output coupling
Time base
Sweep speed
Magnification
X-Y display
0.2us - 0.2s/div
19 step, 1-2-5 sequence
xlO (max speed 100 ns/div)
X=EXT. TRG or \Y\ IN, Y=INPUT
Sensitivity Y axis: 5mV/div - 5V/div
X axis: approx. 0.2V/div
Bandwidth X axis: DC 500 kHz
X-Y phase shift Less than 3° at 10 kHz
Synchronization
Trigger sensitivity
Frequency
INT. trig
EXT. trig
20Hz ~ 2MHz
0.5DIV
200 mV
2MHz - 15MHz
1.5DIV
800 mV
MODE
Source
NORMal trigger and AUTO-
matic trigger Automatic
(sweep free-run)
Normal (sweep runs when
triggered)
TV(+), TV(-)
Extracts the synchronizing
signal from composite video
signal and provides stable
synchronization. Slope
switch is selected accord
ing to polarity of video
signals.
INTernal or EXTernal, or
LINE.

Calibration
Waveform Square wave IkHz +10% (typ)
Voltage 0.5 Vp-p +3%
Power supply AClOO/120/220/240 V
Size and Weigh 190(H)x275(W)x400(D)mm8.5kg
[7.5(H)xl0.8(W)xl5.7(D)in
18.7 lbs]
1.3 Composition
(1) V-151F oscilloscope 1
(2) AT-10AB1.5 Probe 1
(3) Operation manual 1
(4) Power supply cord 1

2. Operation
2.1 Description of Panel Functions
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POWER/INTENSITY
Turns the power on or off, and adjusts trace
brightness on the screen.
Clockwise adjustment increases brightness;
Counterclockwise rotation decreases brightness.
Pilot lamp
Lights when the power is on.
FOCUS
Adjusts focus grid voltage for clarity of the
display.
TRACE ROTATION
Corrects slight tilting of trace caused by
external magnetic fields.
INPUT
This is an input plug for use with the vertical
amplifier and Y-axis (vertical axis) amplifier
during X-Y operation.
Do not exceed the maximum permissible input
voltage, 600p-p or 300V (DC+AC peak)
AC-GND-DC
(Alternating Current-Ground Switch-Direct
Current)
Switches the coupling of the signal fed to the
vertical axis input . DC coupling is obtained
on the DC position. On AC position, the direct
current component is blocked by a capacitor.
The GND position grounds the input of the ampli
fiers and opens the input terminal (J).
Position (PULL x5 GAIN)
it (Vertical position adjustment)
Clockwise rotation will move pattern up, and
counterclockwise rotation will move pattern down.
When the knob is pulled, the vertical axis
sensitivity at each range of volts/DIV is in
creased by 5 times.
VOLTS/DIV
This is a knob for switching the sensitivityof
the input signal fed to INPUT (s). Switching
action is accomplished in 10 steps from 5mV/DIV
to 5V/DIV. On X-Y operation, the knob functions
to change the sensitivity of the Y-axis.
To measure by the use of the indicated voltage
sensitivity, be sure to set the VARIABLE to
CAL by turning it fully clockwise (Click stop).
If the signal is applied to the input terminal
(J) by the use of a 1/10 low capacitance probe,
the values are ten times the indicated voltage.