Hameg HM5510 Mode D'emploi page 37

Select MARKER with the pushbutton, the LED will light up.
At the same time the crt display will show the marker as a
bright spot of appr. 1 mm. The LCD display will show at
the top left the marker frequency (M293.002 MHz) und
below the marker level L -25.5 dBm), these values, of
course correspond to the marker position on the screen..
The marker can be moved using the knob. The keyboard is
disabled if MARKER is active.
Please note:
If the level of any signal portion transgresses the top
graticule line it will not only no more be visible, but the
measuring amplifier's linear range will end at approx.
+2.5 dB above the graticule top. The signal will then be
limited which causes distortion and false measure-
ments! Therefore LIMIT will be displayed if any signal
portion will reach +2.5 dB above the graticule top (=
reference level).
TUNING – The values of the following functions can be
set with this knob: FOCUS/TR
, CENTER FREQ. , MARKER , REF.-LEVEL
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PHONE% und TG.-LEVEL
is active the LED of which is lit.
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REF.LEVEL – Setting the reference level.
The function is selected by pressing the pushbutton, the
LED will light up. The value can be chosen either with the
knob TUNING or by entering it into the keyboard and
pressing the pushbutton again. The display will show e.g.
R-10.0dBm.
Changing the reference level does not influence the
sensitivity. If the noise band is at the bottom of the display
the reference level can not be increased, only decreased,
at the same time the noise band will shift upward
decreasing the dynamic range.
The entry of values outside the specifications is not
possible, the entry will be automatically corrected. The
attenuator setting will not be affected.
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PHONE% – Headphone volume. resp. Tracking Genera-
tor (HM 5511).
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The connector is a 3.5 mm type and destined for head-
phones with an impedance ≥ 8 ohms.
The volume is set with TUNING
an AM detector and may be used to identify sources of
interference. The spectrum analyzer may be used as a
receiver by connecting an antenna to the input, with zero
span it can be tuned to individual frequencies. Use as a
receiver may be restricted by laws in certain countries!
HM5510 – PHONE%:
Press the pushbutton shortly, this will select the
headphone volume control. The LED will light up.
As soon as another function is selected this function will
be deactivated.
HM5511 – PHONE%:
, INTENSITY , CONTRAST
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12
(HM5511 only); That function
. This signal comes from
C o n t r o l s a n d c o n n e c t i o n
Press the pushbutton longer, this will select the head-
phone volume control. The LED will remain dark, the
display shows "PHONE VOL". As soon as another funtion
is selected this function will be deactivated.
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TG.-LEVEL – (HM5511 only): Output level of the tracking
generator.
Press shortly, this will activate the TG.-LEVEL, the LED
,
will light up, the display shows e.g. "T-22.5dBm". Activating
another function will deactivate this function.
Setting of the TG.-LEVEL can be done either with the knob
TUNING or by entering the value into the keyboard
is possible to preset the level while the output is still off.
See also explanation
Inputs outside the specifications are not accepted but
automatically corrected by setting the appropriate range
limit. E.g.: 0 dBm instead of + 20 dBm or – 50 dBm instead
of – 80 dBm.
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19
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INPUT 50Ω – Measurement input, max. 25 V
+10 dBm hf. With the attenuator set to –40 dB the maximum
input hf signal is +20 dBm. Higher levels may destroy the
input stage.
The N connector is directly connected to the chassis and
thus with the safety earth of the power plug!
14
PHONE – Headphone output connector, 3.5 mm. This out-
put is destined for headphones with an impedance of
≥8 ohms. The volume can be set after activating PHONE%
12
with TUNING
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ATTEN. – Input attenuator.
The pushbuttons belonging to the attenuator allow
selection of 10 to 40 dB of attenuation in 10 dB steps.
Depending on the setting selected the maximum signal
level will be:
Max. signal level
–30 dBm
–20 dBm
–10 dBm
0 dBm
+10 dBm
20
.
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14
16 15
DC
.
Attenuator setting
0 dB
10 dB
20 dB
30 dB
40 dB
Subject to change without notice
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9
10
11
12
. It
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resp. max.
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