12
Subject to change without notice
If the signal height is insufficient, the
CURSOR
lines do
not change. In
DUAL
mode the
CURSOR
lines are related
to the signal which is used for internal triggering.
Voltage CURSOR
.....
If voltage measurement is present, the CURSOR lines are
automatically set to the positive and negative peak value
of the signal. The accuracy of this function decreases with
higher frequencies and is also influenced by the signal‘s
pulse duty factor.
Time/Frequency CURSOR
.....
If complex waveforms such as video signals are applied,
the cursor lines may not align exactly with one period and
give a false reading.
DIGITAL MODE ONLY
If ROLL (“rol”) or SINGLE (“sgl”) is active, AUTOSET
switches to the last used REFRESH mode.
(3) INT./FOC.
Knob for intensity and focus setting, with
associated LEDs and TRACE ROT. pushbutton.
3.1 Briefly pressing the TRACE ROT. pushbutton switches
over the INT./FOC. knob to another function, which is
indicated by an LED. If the readout
(RO)
is not switched
off, the sequence is A, FOC, RO, A. In condition READOUT
deactivated, the switching sequence is A, FOC, A.
3.1.1 “A”:
The
INT./FOC.
knob controls the signal(s) intensity. Turning
this knob clockwise increases the intensity. Only the
minimum required trace intensity should be used,
depending on signal parameters, oscilloscope settings and
light conditions.
3.1.2 “FOC“:
The
INT./FOC.
knob controls both the trace and the readout
sharpness. Note: The electron beam diameter gets larger
with a higher trace intensity and the trace sharpness
decreases. This can be corrected to a certain extent.
Assuming that the trace sharpness was set to optimum in
the screen center, it is unavoidable that the trace sharpness
decreases with an increasing distance from the center.
Since the settings of the signal(s) intensity (A) and the
READOUT (RO) are usually different, the FOCUS should
be set for optimum signal(s) sharpness. The sharpness of
the READOUT then can be improved by reducing the
READOUT intensity.
(4) RM
The remote control mode can be switched on or off (”
RM
”
LED dark) via the
RS232
interface. When the ”
RM
” LED is
lit, all electronically selectable controls on the front panel
are inactive. This state can be cancelled by depressing the
AUTOSET
pushbutton provided it was not deactivated via
the interface.
(5) RECALL / SAVE
Pushbutton for instrument settings
The instrument contains 9 non volatile memories. These
can be used by the operator to save instrument settings
and to recall them.
SAVE:
Press and hold the RECALL/SAVE button to start a storage
process. This causes the SAVE menu (Standard menu, note
“B: Menu-Display and Operation”) to be displayed. Choose
the memory location cipher (highlighted) by pressing a
2. trigger source, slope and coupling.
3. operating condition of delay time base in analog mode;
or in digital mode, pre or post trigger time.
4. measuring results.
Bottom of the graticule from left to right:
1. probe symbol (x10), Y deflection coefficient and input
coupling channel I.
2. “+” symbol (addition).
3. probe symbol (x10), Y deflection coefficient and input
coupling channel II.
4. channel mode (analog) or signal display mode (digital).
The trigger point symbol is displayed at the left graticule border
line (analog mode). The CURSOR lines can take any position
within the graticule.
D: Description of Controls
Preliminary note:
For better identification all controls are numbered consecutively.
A number within a square indicates a control which is for digital
mode. The latter will be described at the end of the listing.
The large front panel is, as usual with Hameg oscilloscopes,
marked with several fields.
The following controls and LED indicators are located
on the top, to the right of the screen, above the
horizontal line:
(1) POWER
Pushbutton and symbols for
ON (I)
and
OFF (O)
.
After the oscilloscope is switched on, all LEDs are lit and
an automated instrument test is performed. During this time
the
HAMEG
logo and the software version are displayed on
the screen. After the internal test is completed successfully,
the overlay is switched off and the normal operation mode is
present. The last used settings and the readout then become
activated. An LED (3) indicates the ON condition.
(2) AUTOSET
Briefly pressing this pushbutton results in an automatic
instrument setting selecting Yt mode as the default. The
instrument is set to the last used Yt mode setting
(CH I,
CH II
or
DUAL)
and to a medium trace intensity, if less
intensity had been present before. The operation mode
(analog or digital) will not be changed.
The instrument is set automatically to normal (undelayed)
time base mode, even if the previous Yt mode included
search (“sea”), delay (“del”) or triggered delay (“dTr”) time
base mode.
Please also note ”AUTOSET” in section “First Time
Operation”.
Automatic
CURSOR
positioning:
If
CURSOR
lines are displayed and AUTOSET is chosen the
CURSOR
lines are set automatically under suitable conditions
and the readout briefly displays “SETTING CURSOR”.
Controls and readout
