SHORT INSTRUCTION FOR HM 2 0 3 -4
First Time Operation
Connect the instrument to power outlet. Switch on
POWER
pushbutton. No other button is pressed.
LED indicates operating condition
Case, chassis, and all measuring connectors are connected to
the Safety Earth conductor (Safety Class I).
TRIGGER SELECTOR
switch to
AC, AT/NORM.
button in out position (Automatic Triggering).
Adjust
INTENS,
control for average brightness.
Center trace on screen using
X-POS.
and
Y-POS.I
controls. Then focus trace using
FOCUS
control.
Operating Modes of the Vertical System
Channel I: All pushbuttons in out position.
Channel
II: CHI/II
button pressed.
Channel
I
and
Channel
II: DUAL
button pressed.
Alternate channel switching:
ALT/CHOP
button in out position.
Chopped channel switching:
ALT/CHOP
button pressed. Signals <1 kHz with
CHOP.
Channel
I
+
II
(sum):
l
+
ll (ALT/CHOP)
button pressed only.
Channel
—l
+
ll
(difference):
l
+
ll (ALT/CHOP)
and
INVERT I
buttons pressed.
Trigger Modes
Automatic Triggering:
AT/NORM.
button in out position. Trace always visible.
Normal Triggering:
AT/NORM.
button pressed. Trace visible when triggered.
Triggering from positive-going signal edge: + / — slope button in out position.
Triggering from negative-going signal edge: + / — slope button pressed.
This facility is important when only a portion of a cycle is being displayed.
Internal triggering from Channel I:
TRIG. I/II (CHI/II)
button in out position.
Internal triggering from Channel II:
TRIG. I/II (CHI/II)
button pressed.
These both internal trigger modes are valid also for dual channel operation.
External triggering from
TRIG. EXT.
connector: small
TRIG. EXT.
button pressed.
External trigger signal:
0.6-10Vpp,
time-related to vertical input signal.
Line triggering:
TRIGGER SELECTOR
switch in
LINE
position.
Trigger coupling selected with
TRIGGER SELECTOR
switch
AC-DC-HF-LF.
DC
coupling needs Normal Triggering.
Trig. freq. range:
AC
and
DC
to 1 MHz,
HF
above 1 MHz,
LF
below 1 kHz.
Video signal mixtures with line freq.:
TRIGGER SELECTOR
to
AC
or
DC.
Use Normal Triggering.
Video signal mixtures with frame freq.:
TRIGGER SELECTOR
to
LF.
Use Normal Triggering.
Measuring
Connect test signal to
CH.I
and/or
CH.II
vertical input connector.
Compensate attenuator probe using
CAL. 0.2V
square-wave signal.
Select
AC
or
DC
input coupling.
GD:
Y amplifier is disconnected from input and grounded.
Adjust required display height of signal with
AMPL.
attenuator switch and variable control.
Select sweep speed with
TIMEBASE
switch and variable control.
Adjust trigger point with
LEVEL
control (only for Normal Triggering).
Calibrated amplitude measurement with
AMPL.
attenuator variable control to
C.
Calibrated time measurement with
TIMEBASE
variable control to
C.
Horizontal x5 expansion:
X-MAGN. X5
button pressed.
External horizontal deflection
(X-Y operation)
with
HOR. EXT.
button pressed (X input via
CH.II).
Component Tester
Press
COMPONENT TESTER
button. Connect both component terminals to
CT
and ground jacks.
In-circuit test:
Test circuit must be disconnected to power, signals and ground (earth).
Pull out power plug, remove all connections to scope (cable, probe), then start testing.
K1 203-4
