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100
ms/div. -
10
Hz
0.1
ms/div. -
10 kHz
50
ms/div. -
20
Hz
50
ns/div. -
20 kHz
20
ms/div. -
50
Hz
20
[xs/div. -
50 kHz
10
ms/div. - 100
Hz
10
[xs/div. - 100 kHz
5
ms/div. - 200
Hz
5
ns/div. - 200 kHz
2
ms/div. - 500
Hz
2
|is/div. - 500 kHz
1
ms/div.
1 kHz
1
[xs/div. -
1 MHz
0.5 ms/div. -
2 kHz
0.5
fj,s/div. -
2MHz
0.2 ms/div. -
5 kHz
0.2
|xs/div. -
5MHz
When
the
X-MAG. xIO
button is depressed, a marker or
cycle peak will be displayed every lOdiv. ±5% (with vari¬
able control in
CAL.
position; measurement in
the5|xs/div.
range). The tolerance is better measurable in the
50 ns/div.
range (one cycle every 1 div.).
Holdoff time
The variation of the holdoff time during turning the
HOLD
OFF
knob can not be tested without opening the instru¬
ment. However, a visual check can be made.
Without input signal, set
TIME/DIV.
and time variable con¬
trol cw, use automatic triggering. At the left hand stop of the
HOLDOFF
knob, the trace should be bright. It should darken
remarkably at the right hand stop of the
HOLDOFF
knob.
Component Tester
After pressing the CTbutton, a horizontal straight line has to
appear immediately, when the
CT
socket is open. The
length of this trace should be approx.
8div.
With connection
of the
CT
socket to the ground jack in the Y-Section, a verti¬
cal straight line with approx. 6div. height should be dis¬
played. The above stated measurements have some toler¬
ances. They are dependent among other things on the
mains/iine voltage.
Trace Alignment
The CRT has an admissible angular deviation ±5° between
the X deflection plane D1-D2 and the horizontal center line
of the internal graticule. This deviation, due to tube produc¬
tion tolerances (and only important after changing the CRT),
and also the influence of the earth's magnetic field, which is
dependent on the instrument's North orientation, are cor¬
rected by means of the
TR
potentiometer. In general, the
trace rotation range is asymmetric. It should be checked,
whether the baseline can be adjusted somewhat sloping
to
both sides
round about the horizontal center line of the
graticule. With the HM 203-7 in its closed case, an angle of
rotation ±0.57° (0.1 div. difference in elevation per 10div.
graticule length) is sufficient for the compensation of the
earth's magnetic field.
Mains/Line Voltage Checks
If a variable mains/line transformer is available, the charac¬
teristics of the HM203-7 on power voltage fluctuations of
±10%, referred to the voltage indicated by a triangle above
the fuse holder (rear panel), should be checked. Under
these conditions no variations should be detected on the
display In either the vertical or horizontal axis.
T4 203-7
Subject to change without notice
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