Controls And Connection; Description Of Controls - Hameg Instruments HM5510 Manuel

C o n t r o l s a n d c o n n e c t i o n

Controls and connection

Remarks
The TUNING knob can be used to set the parameters of
most functions, if the limits are reached an acoustic signal
will sound.
Select the function with any of the keys to the left of the knob,
the associated LED will light. Selection of another function
will deselect the former.
The following function are adjustable by the knob:
– FOCUS/TR
– INTENSITY
– CONTRAST
– CENTER FREQ.
– MARKER
– REF.-LEVEL
– PHONE %

Description of controls

Sreen (CRT)
FOCUS / TR
Toggle function. Adjustment by TUNING knob
Focus: Focus adjustment is best done with a signal which
covers most of the screen and with moderate intensity,
adjust for optimum focus over the whole screen; it is nor-
mal that the focus is best in the screen center and falls off
towards the edges.
Trace rotation: The crt has an internal graticule. Due to
production tolerances the defl ection plates will not be
perfectly adjusted to the graticule. In order to correct for
this a coil around the CRT receives a positive or negative
current which causes rotation of the picture with respect to
the graticule. Adjust so that the baseline is exactly parallel
to the graticule lines.
INTENSITY – Select with the key and adjust with the knob
for a moderately bright display. Too much intensity will
have the adverse effect of trace blooming (poor focus) and
will not reveal more signal details. Normally, intensity and
focus are adjusted together as they interact. First set the
intensity then adjust for best focus at that level.
CONTRAST – Adjust for best LCD display contrast, turning
right increases the contrast.
POWER – Mains switch. The symbol I denotes ON,
After turn-on the LCD display will show the fi rmware ver-
sion for several seconds. Wait approx. 20 s for the CRT to
warm up.
Keyboard – The keyboard contains 10 decimal keys, a deci-
mal point key, the C/ESC key. The following functions are
available: CENTER FREQ and REF.-LEVEL. Alternatively,
these may also be adjusted with the knob TUNING
other functions are only adjustable with the knob.
In case any of the LEDs MARKER, CONTRAST, INTENSITY,
FOCUS/TR is lighted or if the LCD display shows PHONE
36
Subject to change without notice
VOL., operation of the keyboard is disabled, an acoustic
warning signal will sound. Prior to keying in the desired
function must be selected by any of the pushbuttons, also
the associated LED must light up.
With the REF.-LEVEL please note that this may have to be
entered with a minus sign! After entering the sign or of the
fi rst digit the value will be displayed. This is also the case
with CENTER FREQ., here, of course, no negative sign.
After all digits were entered the new value will be accepted
by pressing the associated pushbutton a second time. An
attempt to enter values outside the limits will cause the
display of the limit value and sounding of the acoustic
signal. In REF.-LEVEL function the input attenuator will
not be affected.
Display – LCD with 20 characters in 2 lines
CENTER FREQ. – Can be set either by the knob
keyboard after selecting this function with the pushbut-
ton, the LED will light up.
The frequency will be displayed at the top left.
Using the keyboard will require to press the pushbutton
again after all digits were entered. A signal with the center
frequency chosen will be displayed in the screen center,
OFF. provided the span was not set to zero.
Illegal inputs from the keyboard will not be accepted: inputs
beyond limits are automatically corrected by displaying the
limit or disregarded by showing a minus sign.
MARKER – Frequency and level measurement.
. The
or the