Front Panel Elements, Front View - Hameg HM 303-4 Manual

Front Panel Elements HM 303 (Brief Description - Front View)
Element
1
POWER
(pushbutton + LED)
INTENS.
2
(knob)
TR
3
(potentiometer;
adjustment with
screwdriver)
4 FOCUS
(knob)
X-MAG. x10
5
(pushbutton switch)
6 X-POS.
(knob)
HOLD OFF
7
(knob)
XY
8
(pushbutton switch)
Attention! Phosphor burn-in without X signal.
9 TRIG.
(lever switch)
~
AC-DC-LF-TV-
TR
(LED)
ALT.
10
(pushbutton switch)
SLOPE +/− − − − −
11
(pushbutton switch)
12 TIME/DIV.
(rotary switch)
Variable
13
timebase control
(center knob)
14 TRIG. EXT.
(pushbutton switch)
AT/NORM.
15
(pushbutton switch)
LEVEL
16
(knob)
TRIG. INP.
17
(BNC connector)
18 CAL. 1kHz/1MHz
(pushbutton switch)
19 0.2V-2V
(test sockets)
20 COMP. TESTER
(4mm jacks)
Function
Turns scope on and off.
LED indicates operating condition.
Intensity control
for trace brightness
Trace rotation.
To align trace with horizontal
graticule line. Compensates
influence of earth's magnetic field.
Focus control for
trace sharpness.
10:1 expansion in the X direction.
Max. resolution 10ns/div.
Controls horizontal
position of trace.
Controls holdoff-time
between sweeps.
Normal position = full ccw.
Selects X-Y operation,
stops sweep.
X signal via CH. II.
Trigger selector:
AC: 10Hz−100MHz.
DC: DC−100MHz.
LF: DC−1.5kHz.
TV: Triggering for frame and line.
~
: Internal line triggering.
LED lights, if sweep is triggered.
Triggering alternates between CHI and
CHII in alternating DUAL Channel mode
only.
Selects the slope of the trigger signal.
+ = rising edge;
− = falling edge.
Selects time coefficients (speeds)
of timebase,
from 0.2s/div. to 0.1µs/div.
Variable adjustment of timebase.
Decreases X deflection speed
at least 2.5 fold.
For time measurements
turn to right hand stop.
Button released = internal triggering.
Button depressed = external triggering,
trigger signal via TRIG. INP
Button released = autom. triggering,
trace visible without input signal.
Button depressed = normal triggering
with LEVEL adjustment
16
Adjustment of trigger level.
Input for external trigger signal.
(Pushbutton TRIG. EXT. depressed.)
14
Selects calibrator frequency.
Button released: approx. 1kHz,
Button depressed: approx. 1MHz.
Calibrator square wave output,
0,2V or 2V .
pp pp
Connectors for test leads
of the Component tester.
Element
21 . C OMP. TESTER
(pushbutton switch)
22 Y-POS.I
(knob)
GD− − − − − AC− − − − − DC
23
(pushbutton switches) vertical amplifier.
INPUT CH I
24
(BNC connector)
INVERT CH I
25
(pushbutton switch)
VOLTS/DIV.
26
(12 position
rotary switch)
27 VAR. GAIN
(knob)
CH I/II-TRIG. I/II
28
(pushbutton switch)
29 Y MAG. x5
(pushbutton switches) Y-sensitivity (CH I or CHII resp.) 5 fold
DUAL
30
(pushbutton
switch)
ADD
31
(pushbutton switch)
OVERSCAN
32
(LED indicators)
VAR. GAIN
33
(knob)
.
17
34 VOLTS/DIV.
(12 position
.
rotary switch)
INVERT CH II
35
(pushbutton switch)
= difference CH. I CH. II.
AC− − − − − DC− − − − − GD
36
(pushbutton switches) vertical amplifier. Specs see
INPUT CH II
37
(BNC connector)
Y-POS.II
38
(knob)
Function
Switch to convert oscilloscope
to component tester mode.
Controls vertical position
of channel I display.
Selects input coupling of CH. I
DC = direct coupling
AC = coupling via capacitor
GD = signal disconnected
from input,
Y amplifier input grounded.
Channel I signal input.
Input impedance 1MΩII20pF.
Inversion of CH. I display.
In combination with ADD button
= difference CH. II CH. I.
Channel I input attenuator.
Selects Y input sensitivity
in mV/div. or V/div.
in 1-2-5 sequence.
Fine adjustment of Y amplitude CH. I.
Increases attenuation factor
min. by 2.5 (left hand stop).
For amplitude measurement must be
in CAL. position (right hand stop).
No button depressed: CH. I only
and triggering from channel I.
When depressed, channel II only
and triggering from channel II.
(Trigger selection in DUAL mode).
When depressed, increasing of
(max. 1mV/div.)
Button released: one channel only.
Button depressed: channel I
and channel II in alternating mode.
CHOP. DUAL and ADD buttons depressed:
CH. I and CH. II in chopped mode.
ADD depressed only: algebr. addition.
In combination with INVERT:
difference.
Direction indicators.
Illuminated when trace passes
vertical screen limits.
Fine adjustment of Y amplitude CH. II.
Increases attenuation factor
min. by 2.5 (left hand stop).
For amplitude measurement must be
in CAL. position (right hand stop).
Channel II input attenuator.
Selects Y input sensitivity
in mV/div. or V/div.
in 1-2-5 sequence.
Inversion of CH. II display.
In combination with ADD button
Selects input coupling of the CH II
CH. II signal input and input for
horizontal deflection in X-Y mode.
Controls vertical position
of channel II display.
Inoperative in X-Y mode.
.