Hameg HM8030-5 Handbuch Seite 14

holding case firmly in place, pull chassis forward
out of case. When later replacing the case, care
should be taken to ensure that it properly fits under
the edges of the front and rear frames. After
removal of the two screws at the rear of the
module, both chassis covers can be lifted. When
reclosing the module, care should be taken that
the guides engage correctly with the front chassis.
Operation of the module
Provided that all hints given in the operating
instructions of the HM8001 Mainframe were
followed especially for the selection of the correct
mains voltage start of operation consists practically
of inserting the module into the right or left opening
of the mainframe. The following precautions should
be observed:
Before exchanging the module, the mainframe
must be switched off. A small circle (o) is now
revealed on the red power button in the front
centre of the mainframe.
Control elements of HM8030-5
(1) DISPLAY (7-segment LED) 4-digit frequency
meter. LED indicators for Hz and kHz.
(2) SWEEP(push button)
Activates internal wobbulation. Selection of start
frequency, stop frequency and sweep time.
(3) FREQUENCY (adjusting knob)
Continuous and linear frequency fine adjustment,
with the setting range from 0.095 to 1.1, overlapping
the ranges selected with (4)
(4) FREQUENCY (2 pushbuttons)
Frequency range selection from 0.05Hz to 5MHz
in 8 decade steps.
(5) (LED s)
Indication of selected function.
(6) (pushbutton)
Mode selection: Triangle, Sine, Square, Off.
(7) TRIGGER OUTPUT(BNC connector)
This short-circuit-proof output supplies a square
signal in synchronism with the output signal. It is
TTL compa-tible and has a duty-factor of approx.
50%.
Sous réserve de modifications / Reservado el derecho de modificación
If the BNC sockets at the rear panel of the
HM8001 unit were in use before, the BNC cables
should be disconnected from the basic unit for
safety reasons. Slide in the new module until the
end position is reached.
Before being locked in place, the cabinet of the
instrument is not connected to the protective earth
terminal (banana plug above the mainframe
multipoint connector). In this case, no test signal
must be applied to the input terminals of the
module.
Generally, the HM8001 set must be turned on
and in full operating condition, before applying any
test signal. If a failure of the measuring equipment
is detected, no further measurements should be
performed. Before switching off the unit or
exchanging a module, the instrument must be
disconnected from the test circuit.
(8) OFFSET (adjusting knob)
Adjustment of the positive or negative offset
voltage. This DC voltage can be superimposed on
the output signal. The max. offset voltage is ±5V
(o.c.) or ±2.5V respectively when terminated with
50 Ω.
(9) ON (pushbutton)
Activates the offset function.
(10) 50Ω Ω Ω Ω Ω OUTPUT (BNC connector)
Short-circuit-proof signal output of the generator.
The output impedance is 50Ω, and the max. output
amplitude is 20Vpp (o.c.) or 10Vpp respectively
when terminated with 50Ω.
Attention! The output is protected against
external DC voltages up to max. ± 45 V up to 30
sec.
(11) -20dB, -20bB (pushbutton)
Two fixed attenuators, 20dB each. They can be
used separately. When both pushbuttons are
activated, a total attenuation of 40dB results.
Including the amplitude control (14), the max.
attenuation amounts to 60dB (factor 1000).
(12) AMPLITUDE (adjusting knob)Continuous
adjustment of the output amplitude from 0 to -
20dB.
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