Hameg HM 1004-3 Series, Manual

Page: 12 / 36

Subject to change without notice
12
Controls and Readout
In DUAL mode the CURSOR lines are related to the signal
which is used for internal triggering.
If the signal height is insufficient, the CURSOR lines do
not change.
(3) RM -
The remote control mode can be switched on or off via
the RS232 interface. In the latter case the
“RM” LED is
lit and the electronically selectable controls on front panel
are inactive. This state can be left by depressing the
AUTO SET pushbutton provided it was not deactivated
via the interface.
(4) INTENS - READOUT
Knob with associated pushbutton and LEDs.
This control knob is for adjusting the A and B traces and
readout intensity. Turning this knob clockwise increases
and turning it counterclockwise decreases the intensity.
The READOUT pushbutton below is for selecting the
function in two ways.
Depending on the actual timebase mode and with the
readout
(RO) not switched off, briefly pressing the
READOUT pushbutton switches over the INTENS knob
function indicated by a LED in the sequences:
A - RO - A in condition A timebase,
A - RO - B - A if alternate timebase mode is present and
B - RO - B in condition B timebase.
XY mode: A - RO - A.
Component Test: A - RO - A.
Pressing and holding the READOUT pushbutton switches
the readout on or off. In readout off condition the INTENS
knob function can consequently not be set to RO . Briefly
pressing the pushbutton causes the following sequences:
condition sequence
A timebase A - A
Alternate A/B A - B - A
B timebase B - B
XY mode A - A
Component Test A - A
Switching the readout off, may be required if interference
is visible on the signal(s). Such interference may also
originate from the chopper generator if the instrument is
operated in chopped
DUAL mode.
With the exception of the letters “CT” all other READ-
OUT information is switched off in COMPONENT TEST
mode.
All INTENS settings are stored after the instrument is
switched off.
The AUTOSET function switches the readout on and
selects A timebase mode (A-LED lit). The INTENS setting
for each function is automatically set to the mean value,
if less intensity was previously selected.
(5) TR
The trace rotation control can be adjusted with a small
screwdriver (
please note “trace rotation TR” )
(6) FOCUS
This control knob effects both the trace and the readout
sharpness.
(7) SAVE / RECALL
The instrument contains 9 non volatile memories. These
can be used by the operator to save instrument settings
and to recall them. This relates to all settings with the
exception of
FOCUS, TR (trace rotation) and the calibrator
frequency pushbutton.
Press the SAVE pushbutton briefly to start the save
procedure. The readout then indicates the letter “S”
followed by a cipher between 1 and 9, indicating the
memory location. If the instrument settings stored in this
memory location must not be overwritten, briefly press
the
SAVE or the RECALL pushbutton to select another
memory location. Each time the SAVE pushbutton is
briefly pressed the memory location cipher increases
until the location number 9 is reached. The
RECALL
pushbutton function is similar but decreases the memory
location cipher until 1 is reached. Press and hold
SAVE for
approx. 3 seconds to write the instruments settings in the
memory and to switch the associated readout informa-
tion (e.g. “S8”) off.
To recall a front panel setup, start that procedure by
briefly pressing the
RECALL pushbutton. The readout
then indicates the letter “R” and the memory location
number. If required, select a different memory location as
described above. Recall the settings by pressing and
holding the RECALL pushbutton for approx. 3 seconds.
Attention:
Make sure that the signal to be displayed is similar to
the one that was present when the settings were
stored. If the signal is different (frequency, amplitude)
to the one during storage then a distorted display may
result.
If the SAVE or the RECALL pushbutton was depressed
inadvertently, briefly press both pushbuttons at the same
time or wait approx. 10 seconds without pressing either
pushbutton to exit that function.
Switching the instrument off automatically stores the
actual settings in memory location 9, with the effect that
different settings previously stored in this location get
lost. To prevent this, RECALL 9 before switching the
instrument off.
Attention!
Both pushbuttons have a second function if the
instrument is switched to menu operation. Please
note "MENU".
The setting controls and LED’s for the Y amplifiers,
modes, triggering and timebases are located under-
neath the sector of the front panel described before.