Function Of The Controls; Power; Adjust; Intens - Led - Hameg HM400 Handbuch

F u n c t i o n o f t h e c o n t r o l s

Function of the controls

1 2 3 4 5 6 7

ADJUST

SELECT

POWER

POWER
!
INTENS
+
+
FOCUS
TRACE
SAVE push long
RECALL

POSITION 1

POSITION 2
1
CH1 CH1 1–6
AUTOSET
2
CH2 CH2
8 9
10 11
1
POWER
Pushbutton switch with indications of off (0) and on (I) positions. After
turn-on all LEDs will light up, the instrument performs a self-test.
As soon as this has been successfully completed, the oscilloscope
will switch to normal operation, all settings which were valid before
switching off will be resumed.
2
ADJUST –
Allows to reduce the value of diverse settings selected by SELECT
3
ADJUST +
Allows to increase the value of diverse settings selected by SELECT
4
INTENS – LED
The LED will light if the function intensity adjustment was selected by
7
SELECT . With the buttons ADJUST –
sity may be decreased resp. increased. It is recommended to set the
intensity no higher than needed for easy viewing, this depends on signal
parameters, oscilloscope settings and the ambient light conditions.
5
FOCUS – LED
The LED will light up if the function focus adjustment was selected by
7
SELECT . With the buttons ADJUST –
can be changed. The focus adjustment depends on the intensity, the
lower the intensity, the better the focus. Also, the focus depends on
the location of the trace on the screen, the best focus is always in the
center and it decreases towards the edges. A reasonable focus setting
is hardly possible with only the trace on screen. Due to the interaction
between intensity and focus, the best procedure is this:
1. Apply a sine wave signal which covers the whole screen.
2. Set the intensity.
3. Adjust the focus for a uniform well focussed display over most of
the screen area.
Please note that the display of signals with a low rep rate at high
sweep speeds will ask for a higher intensity setting, this will entail a
readjustment of the focus.
6
TRACE – LED
The LED will light up if the function trace rotation was selected by
7
SELECT . With the buttons ADJUST –
rotation can be adjusted. Due to the earth's magnetic fi eld the trace may
not be parallel to the graticule lines, adjust for exact parallelism. See
also under „Trace Rotation" in the chapter „First time operation".
7
SELECT
This button allows to select and change the settings related to the
trace in conjunction with the buttons ADJUST –
3
. By pressing this button shortly the functions intensity
5 6
and trace rotation will be enabled in turn as indicated by the
associated LEDs.
8
POSITION 1
This knob controls the trace position of channel 1 (CH 1). In ADD mode
8
both position controls , 11 will be effective. In XY mode the Y position
12 15
HM400
40 MHz ANALOG OSCILLOSCOPE
AUTO TRIGGER TRIG'd
X-POSITION
LEVEL
NORM
SLOPE X-MAG
x10
13 14 16 17
2 3
and ADJUST + the inten-
2 3
and ADJUST + the focus
2 3
and ADJUST + the trace
2
and ADJUST +
4
, focus
Subject to change without notice
7
7
.
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