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knob, e.g. 10 µs (/DIV). By activating the X-MAG / x10
be further increased by a factor of 10 up to the maximum of 10 ns/DIV.
VAR: If the variable function was selected by pressing the knob shortly,
the time base speed can be reduced by turning it CCW and increased
by turning it CW, uncalibrated. Whenever the limits are reached, an
acoustic signal will be heard. By pressing the knob again, the function
variable can be left any time and calibrated operation resumed.
Hold-off time adjustment: Please rever to item
CH I: 500 mV
CH 1 – LED button
16
This button selects CH 1 as the trigger source. In all operating modes
of the vertical amplifier except XY, CH 1 can be selected as the active
internal trigger source by pressing this button which will be indicated
A N A L O G S C O P E
by the LED lighting up.
INTERNAL TRIGGERING: The trigger signal is taken off
internally.
17
CH 2 – LED button
This button selects CH 2 as the trigger source. In all operating modes
of the vertical amplifier except XY, CH 2 can be selected as the active
internal trigger source by pressing this button which will be indicated
by the LED lighting up.
LINE – LED button
18
This button selects the line (mains) as the trigger source. In all ope-
rating modes of the vertical amplifier except XY the line (mains) can
be selected as the active trigger source which will be indicated by the
LED lighting up.
LINE TRIGGERING: The trigger signal is not derived from an
input signal but from the mains and taken from the power
supply.
19
EXT – LED button
This button selects the external input as the trigger source. In all ope-
rating modes of the vertical amplifier except XY pressing this button will
select the external BNC input EXT.TRIG/Z-INP
which will be indicated by the LED lighting up. The external Z-INP for
intensity modulation will be disabled.
EXTERNAL TRIGGER SOURCE: The trigger signal is not taken
from the measuring signals but from an external source.
20
AC – LED button
In all operating modes of the vertical amplifier except XY pressing this
button shortly will select AC trigger coupling which will be indicated
by the LED lighting up.
21
DC – LED button
In all operating modes of the vertical amplifier except XY pressing this
button shortly will select DC trigger coupling which will be indicated
by the LED lighting up. The peak-to-peak detection will be disabled.
LF – LED button
22
In all operating modes of the vertical amplifier except XY pressing this
button will insert a low pass filter (see the specifications) into the trigger
path which will be indicated by the LED lighting up. The low pass will
suppress high frequency interference which could disturb triggering.
23
TV – LED button
In all operating modes of the vertical amplifier except XY pressing
this button shortly will activate the TV trigger separator which will be
indicated by the LED lighting up. The following remarks apply to the
PAL TV standard.
For frame synchronization the TIME/DIV
0.2 s/DIV and 1 ms/DIV, at 2 ms/DIV a full frame will be displayed.
40 Subject to change without notice
POWER
CH1
CH1
12
, the speed can
CH2
CH2
DUAL
DUAL
ADD
ADD
XY
XY
COMP
COMP
27
.
±10 V
COMP .
pp
50 Hz
TESTER
31
as the trigger source
15
knob should be set between
!
ADJUST
SELECT
INTENS
+
+
FOCUS
TRACE
SAVE
push long
RECALL
POSITION 1
POSITION 2
1
1–6
14
14
18
SLOPE
AUTOSET
17
2
VOLTS / DIV
VOLTS / DIV
.2
.1
.2
.1
.5
.5
3
50
50
VAR
20
1
1
10
2
2
5
5
5
5
2
10
10
1
1
20
20
V
mV
V
mV
6
DC
DC
AC
GND
AC
GND
INV
CH 1
CH 2
X-INP
INPUTS
1 M II 15 pF
max.
400 V
p
!
CAT I
24
29 25
24
25
29 26
For line sycnhronization the TIME/DIV
0.5 ms/DIV and 0,1 µs/DIV. At 10 µs/DIV single lines can be displayed,
about 1 ½ lines will be visible.
24
DC/AC – LED buttons for CH 1 + CH2
By pressing these buttons shortly, the coupling of channel 1 or 2 resp.
can be alternated between DC and AC, the LED will light up if AC is
selected.
GND – LED buttons for CH 1 + CH2
25
By pressing these buttons shortly, the input of the channel 1 or 2 pre-
amplifier will be connected to ground resp., which will be indicated by
the LED lighting up. The signal present at the input BNC connector can
not influence the trace. In Yt-mode with auto trigger an undeflected
trace will be visible (zero-volts trace position) .In XY-mode there will
be no deflection in X and Y directions respectively.
INV – LED button for CH 2
26
By pressing this button shortly, the display of the channel 2 signal can
be alternated between normal and inverted. The LED will light up if
inversion is selected.
27
HOLD-OFF/ON – LED button
By shortly pressing this button, adjustment of the hold-off time by
15
turning the knob /TIME/DIV
will be activated which will be indica-
ted by the LED lighting up. Refer to item
triple function of this knob. The knob allows an increase of the hold-off
time from its minimum value by turning it CW, if the end of the range
is reached, an acoustic signal will be heard. Also, when the knob is
turned CCW, the acoustic signal will sound when the minimum value is
reached. As soon as the hold-off time adjustment is disabled by again
pressing
27
, the hold-toff ime will be automatically reset to its minimum
value. By shortly pressing the TIME/DIV knob while
is possible to alternate between setting the time/div. and hold-off time
adjustment. See also under „Hold-off time adjustment".
Z-INP – LED button
28
By shortly pressing this button, the function of the input EXT.TRIG /
Z-INP
31
is changed from external trigger input to external intensity
modulation input which will be indicated by the LED lighting up. If ex-
ternal triggering or the COMPONENT TESTER are selected, no intensity
modulation will be possible resp. it will be disabled. 0 V at the input will
not change the trace intensity, with 5 V TTL level the trace will be fully
suppressed, higher voltages are not allowed.
29
INPUT CH1 + CH2 – BNC connectors
These are the CH1 and CH2 inputs in Yt-mode and the X input in XY
mode. The ground of this connector is connected to the chassis and
thus to the mains safety earth. The buttons DC/AC
INV
26
(CH2 only) corresponf to this input.
HM400
40 MHz ANALOG OSCILLOSCOPE
AUTO
TRIGGER
TRIG'd
X-POSITION
LEVEL
NORM
16
20
22
15
X-MAG
19
21
23
x10
TIME / DIV
.2
.1
TRIGGER
ms
.5
50
VAR
20
1
20
CH 1
AC
10
2
10
5
5
CH 2
DC
10
2
5
20
1
2
LINE
LF
.5
50
µs
.1s
.2
.1
.2s
EXT
TV
HOLD
OFF
ON
Z-INP
EXT. TRIG / Z-INP
1 M
II
15 pF
max.
PROBE ADJUST
100 V
p
1 kHz / 1 MHz
ca. 0.2 Vpp
30
31
27
28
15
knob should be set between
15
for information about the
27
is activated, it
24
, GND
25
and
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