21
Subject to change without notice
Menu
First Time Operation
the exception of the
CT
button,
AUTO SET (2)
and
INTENS (4).
All LEDs except
“A”
or
“RO”
(associated
with the INTENS knob) are dark. The readout displays only
“CT”
in this condition.
One test lead is connected to the CT socket. The second
test lead uses the ground socket
(38)
.
Please note
“Component Tester”
.
The maximum test voltage is approx. 20Vpp under open
circuit conditions, while the max. test current under short
circuit condition is approx. 20mApp.
Menu
The instrument software contains several menus. The controls
regarding the menus are described under item MENU (35) in
section “Controls and Readout”.
The following menus, submenus and items within the
submenus are available:
1. MAIN MENU
1.1 CALIBRATE
Information regarding this can be found in the section
“Adjustments”.
1.2 SETUP
This menu allows changes to the default settings regarding
the instrument behavior during operation. The SETUP menu
contains the submenu “MISCELLANEOUS” and “FACTORY”.
1.2.1 MISCELLANEOUS contains:
1.2.1.1 CONTROL BEEP ON/OFF
In OFF condition the acoustic signal actuated by the control
limits are switched off.
Note:
The default setting is ON. If different conditions are required
the setting must be performed each time after switching the
oscilloscope on.
1.2.1.2 ERROR BEEP ON/OFF
Acoustic signal indicating faulty control operation are
suppressed in OFF condition.
Note:
The default setting is ON. If different conditions are required
the setting must be performed each time after switching the
oscilloscope on.
1.2.1.3 QUICK START ON/OFF
In condition ON the HAMEG logo, software information and
check procedures will not be displayed after switching the
instrument on and the instrument is quickly ready for operation.
1.2.1.4 TRIG.-SYMBOL ON/OFF
In most of the Yt (time base) modes the readout displays a
trigger point symbol which will not be displayed in condition
OFF.
1.2.1.5 DC REFERENCE ON/OFF
If ON is selected and Yt (time base) mode is present, the
readout displays a ground symbol (
⊥
). This symbol eases the
evaluation and determination of DC contents by indicating the
0 Volt reference position.
1.2.2 Factory
Attention!
Submenus are available only for HAMEG authorized
service workshops.
First Time Operation
The following text assumes that the “SAFETY” section
of this manual has been read carefully and understood.
Each time before the instrument is put into operation check
that the oscilloscope is connected to protective earth. For that
reason the power cable must be connected to the oscillo-
scope and the power outlet. Then the test lead(s) must be
connected to the oscilloscope input(s). Check that the device
under test is switched off and connect the test lead(s) to the
test point(s). Then switch on the instrument and afterwards
the device under test.
The oscilloscope is switched on by depressing the red
POWER
pushbutton. After a few seconds the
HAMEG
logo and the
instrument software release is displayed on the screen. As
long as the
HAMEG
logo is visible different internal checks are
made. Thereafter the instrument will revert to its last used
operating mode.
If after approx. 20 seconds no trace is visible, the
AUTO SET
pushbutton should be pressed briefly. This selects the Yt
mode and medium trace and readout intensity (please note
“AUTO SET”
). Adjust
Y-POS.I
and
X-POS.
controls to center
the baseline. Adjust
INTENS.
(intensity) and
FOCUS
controls
for medium brightness and optimum sharpness (input(s)
grounded) of the trace. The oscilloscope is now ready for use.
If the
AUTO SET
function was not used and only a spot
appears (
CAUTION! CRT phosphor can be damaged
),
reduce the intensity immediately and check that the XY mode
is not selected (XY not displayed in the readout).
To obtain the maximum life from the cathode-ray tube, the
minimum intensity setting necessary for the measurement in
hand and the ambient light conditions should be used.
Particular care is required when a single spot is displayed, as
a very high intensity setting may cause damage to the
fluorescent screen of the CRT. Switching the oscilloscope off
and on at short intervals stresses the cathode of the CRT and
should therefore be avoided.
The instrument is so designed that even incorrect operation
will not cause serious damage.
Trace Rotation TR
In spite of Mumetal-shielding of the CRT, effects of the
earth’s magnetic field on the horizontal trace position cannot
be completely avoided. This is dependent upon the orienta-
tion of the oscilloscope on the place of work. A centered trace
may not align exactly with the horizontal center line of the
graticule. A few degrees of misalignment can be corrected by
a potentiometer accessible through an opening on the front
panel marked TR.
Probe compensation and use
To display an undistorted waveform on an oscilloscope, the
probe must be matched to the individual input impedance of
each vertical amplifier.
