Hitachi V-209 Service Manual

Then 
connect  the battery  pack connector  to the 
connector  of the  oscilloscope. 
d)  Mount  the plate  with screws. 
e)  Fix the upper  enclosure  on the  oscilloscope  with 
four  screws. 
Fig.  a 
Fig.  b 
  Upper 
enclosure 
, 
Bauery 
Ba  ucry  pack 
Battery pack fi,ing  �crew 
AD-209 
When  mounting  the battery  pack AD-209,  take care not 
to  damage  the connecting  cables and components.  6. 
HOW 
TO PRODUCE  THE BRIGHT  LINE 
Before  turning  0 the  POWER  switch. insure the power 
supply...

If 
the  instrument  is not  used  with  the power  supply  turned 
on.  rotate  the I  TENsity  counterclockwise  to reduce  the 
brightness  and also  blur  the FOCUS. 
NOTE  For  usual  observation,  leave the following  non-calibrating 
function  section set to ''CAL"  position. 
VARIABLE  Rotate 
in the  direction  of arrow. 
In  this  case,  the VOLTS/DIV  is calibrated  to 
its  indicating  value. 
SWP  V AR  Leave 
the knob  in depressed  state. 
In  this  case,  the  TIME/DIV is...

MODE  Switch 
of Vertical  Axis 
TRIG  OURCE 
(2)  When 
observing  two wavefonns  CH2 
CH2 
Observation  of two  wavefom1S  can be made  easily  by 
setting  the MODE  switch of vertical  axis to ALT  or CHOP. 
When  observing  two wavefonns  of high  repetition  frequen­
cies,  set the  MODE  switch to ALT  and, in the  case  of low 
frequencies,  set it to  CHOP. 
Measu rement  of the  phase  difference  is per formed  after 
effecting  synchronization  with leading  phase signal. 
(3)  When...

Connection 
of earth  lead wire 
20  (a) 
A good  example  (b) 
A bad  example 
For  better  measurement.  it is required  to use  an earth 
attachment  available at option. 
Multiply  the reading ofVOLTS  DIY by 10. 
For  example.  if the  VOLTS/DIY  ts SOmV/DIV.  then 
read  the wavefonn  as 
SOmV/DIV  x 10  = SOOmV/DIV 
o  To  avoid  measurement  error, put the probe  in the  follow­
ing  correction  state and check  it before  measurement 
without  fail. 
Connect  the tip of the  probe  to the...

In 
general.  tt tS safe  to avoid  measunng  with non­
shielded  connecting  wire. When  using a shieldmg  wire, 
connect  one end of the  shield  to the  earth  terminal  of 
the  oscilloscope  and the other  end to the  grounding  of 
the  circuit  to be  measured.  It is deirable  to use  a coaxtal 
cable  with B  C  type connector. 
The  following  cautions must be observed  when per­
forming  a wide  band measurement.  It ts necessary  to 
terminate  with the characteristic  impedance of the  cable...

8. MEASURING  PROCEDURE 
The  first  things  to do  are  as follows. 
o  Bring  the brightness  and FOCUS  at optimum  positions 
for  easy  read out. 
� 
Display  the waveform  as large  as possible  to minimiLe 
the  read  error. 
Check  the capacity  correction  when using a probe. 
(Refer  to paragraph  (I) "When  using a probe"  of Sec­
tion  7. "Method  for connecting  signals" for correcting 
capacity.) 
(I)  DC  voltage measurement 
Set  input  coupling  to G  D  and decide  the...

r/f\ ----�ff\ --
1\ I 1\ 
\17  1\ 
H--+--f--t-1-t-+---+-_+=1_  -- ---
(3)  Measurement  of frequency  and period 
This  will be explained  with the following  figure. 
One  period  covers the time  A and  time  B, which  are  sepa­
rated  from each other  by 2.0  DIY  on the  screen. 
When  the sweep  time is I ms/DIY,  the period  is given  by 
1  ms/DIV  x 2.0  = 2.0  ms 
=2.0  X 10-3  S 
Accordingly,  the frequency  is 
1/(2.0  X J0- 3)=  500Hz 
(However,  when the knob  MAG  x!O is at  pulled  out...

24 This 
means  that CHI  is used  as the  triggering  signal  when 
investigating  the length  of time  by which  the signal  of CH2 
is  delayed  from the signal  of CH 1.  C H2  is  used  in the 
reversed  case. In other  words,  the signal  leading  in phase  is 
selected  as the  triggering  signal source. 
If  this  process  is reversed,  the portion  to be  measured  may 
sometimes  not appear  on the  screen.  Thereafter,  equalize 
the  amplitudes  of the  two  signals  appearing  on the  screen...

f
c  x  tr  =  0.35 
Where,  f
c :  Frequency  band (Hz) 
tr:  Rise  time  (s) 
The  rise time  and fall  time  are determined  by the  time 
elapsed  between  the I 0'1  to 9Qc,r  \'a lues  of pulse  width. 
(6)  Synchronization  of complexed  waveform 
In  the  case  shown  in the  Fig.  (a) below  where  two wave­
forms  have difference  in amplitude  alternate. the wave­
form  is doubled  if the  trigger  level is not  set properly.  In 
the  case  where  the trigger  level is selected  as Y...

26 Q) 
Difference 
in the  circuits 
Exclusive  circuit for conventional  oscillograph 
General  circuit 
Video  �ignal 
To  trigger  circuit 
Hard  to synchronize,  because 
video  signal  is applied  directly 
as  trigger  signal.  Simple 
synchronizing 
circuit 
To  trigger  circuit 
Synch ronization  is more  easily 
effected  than  in the  circuit 
shown  at left,  because  the 
signal  is integrated  to remove 
high  frequency  components.  Exclusive 
circuit for this 
instrument 
(Principle...