Idiomas disponibles
Idiomas disponibles
Function selection
The type of output signal is selected with the function
selection switch @). A total number of 3 different wave-
forms — sine, square and triangle — are available. The
functions are marked with the corresponding symbols.
H the "ON"
pushbutton 43 is activated a DC voltage
level is supplied by the HM 80304 or supperimposed оп
the output signal.
Frequency adjustment
Coarse adjustment is performed with the range keys.
The desired frequency is selected by turning the FRE-
QUENCY control @). The selected frequency appears on
the 4-digit display @). Compared to knob scales, this dis-
play has a much higher resolution. To facilitate a precise
frequency adjustment of the last digit, a gear ratio of
4.6:1 of the frequency adjustment potentiorneter is oro-
vided.
Output amplitude and signal connection
Adapiation
in decade steps to the desired amplitude
range is performed by the use of two attenuators with
~ 20dB each, which are activated by pushbuttons.
Including the continuously adjustable AMPLITUDE con-
trol 44, the maxirnum attenuation amounts to — 60dB.
With the maximum amplitude of 10V,,,, the minimum
signal voltage to be supplied is about 10mV. These val-
ues are obtained when the generator output is termi-
nated with 50Q. In the open-circuit condition, the availa-
ole signal amplitude
is twice as high. Therefore
the
maximum
output
voltage
of
the
output
socket
is
specified with 20V,,. # exact square-shaped signals are
required, care should be taken that only 508 coaxial
cables (e.g. HZ34) are used.
Furthermore, this cable
must be terminated with a 509
through-termination
(e.g. HZ22}. Hthese precautions are not observed, over-
shoot may occur, especially when high frequencies are
selected. if test circuits having a 50
input impedance
are connected, this termination is not required. in high
signal voltage ranges, it should be noted that the used
terminating resistor must dissipate the corresponding
effective power.
The output terminal of the HM 8030-4 is short circuit
proof, However, ifan external DC voltage exceeding
+45¥ is applied to the output, the output stage is
likely to destruction.
if the output of the HM 8030-4 unit comes into contact
with components of the circult under test, which are
carrying DC voltage, an isolationg capacitor of approp-
riate dielectric strangih should be connected in series
with the output of the generator. The capacitance of this
isolating capacitor should be selected in that way that
ihe frequency
response
of the output
signal is not
affected
over
the
whole
frequency
range
of
the
HM 8030-4 unit.
Má — 80304
Trigger output
In the sine, square and triangle modes, the trigger output
@ supplies a square signal in synchronism with the out-
put signal. An offset voltage adjusted at the b0S output
ñas no influence upon the tigger signal. The trigger out-
out is short-circuit-proof and can drive several TTL inputs.
Sweep facilities
1) internal sweep
The internal sweep facility of the HM 8030-4 allows check-
ing of filters and equipment in the frequency range from
0.3Hz 10 3MHz. Operation is very easy and is confined to
ine setting of sweep-speed and sweep-width. Activa-
tion is by simply pressing the SWEEP ON push button and
can
be combined
with
all available functions
on the
HM 8030-4. The Stop-frequency is automatically given by
the settings of the range selector and the frequency diat
and is shown on the 4-digit display. Start frequency is
related to the stop-freguency by the sweep-width factor,
Latter is set by means of the (Sweep-} Width potentiome-
ter and is up to approx. 100. The sweep speed is set by
means of the {Sweap-) Speed potentiometer and ranges
rom 20msto4s. For external wobbulation piease refer to
"ΕΜ input".
23 EM input
if a positive DC voltage is applied to the FM input on the
rear panel
of the
HM5001,
the generator frequency
increases and is accordingly displayed. A negative DC
voltage reduces the frequency. The frequency displace-
ment depends on the value and polarity of the DC voltage
U and on the FREQUENCY setting. The set frequency N,
(DC voltage not included) can be selected at will.
Computation:
MN = № + A-U or U = (MA
: A
№ =
digit display without voltage U,
М
=
digit display including voltage М,
U
=
+ voltage at the FM input
A
=
740 (digits per volt),
it should be noted that only the displayed digits are
valid; the decimal paint is not taken into consideration
(e.g. 100.0 £4 1000 digit). The max. frequency (3 MHz}
cannot and "OGO" should not be exceeded. Any zeroes
preceding the decimal point are dropped.
Limits: if the highest displayed number is N = 3000 and
the smallest M, = 306, than U willbe + 3.6V max. The fre-
quency increases by a factor of 70. if the smallest dis-
played number is M = 30 (lower numbers are possible,
but inaccurate) and the highest Ry = 3000, then U willbe
-4V max. The frequency changes by a factor of 100.
The frequency change is finearas a function of the volt-
age U and has the same value in ali ranges.
DE offset
When the switch (3 ON is depressed, a DC voltage can
be superimposed on the output signal. The maxirnum
offset voltage with open output is
士 5V.
Subject to change without notice
