Velleman DVM20FGCN2 Bedienungsanleitung Seite 4

5. Pan nel Descripti
Refer to th he illustrations on
1 Disp play
2 unit ts
3 OVE ER
4 GAT TE
5 RAN NGE
6 FUN NCTION
7 ATT T
8 FRE EQUENCY
9 RAM MP/PULSE
10 AMP PLITUDE
11 DC OFFSET
12 CMO OS LEVEL
13 SYN NC OUTPUT
14 VCF F
15 OUT TPUT
16 POW WER
pow wer plug
17
fuse e holder
18 AC s selector
19 EXT T/INT
20 ATT TEN –20dB
EXT T counter
21
INP UT
6. Ope eration
IMPORTANT: be
setting matches y
NEVER change
The functio on generator can p
to observe the waveform.
1. Triangle e, Square and Sine
a) Fir rst select a wavef
ra ange with the appr
b) Co onnect the OUTPU
c) Ad djust the AMPLITU
2. Pulse
a) Pr ress down the squ
b) Pu ull out the RAMP/P
3. Ramp
a) Pr ress down the tria
b) Pu ull out the RAMP/P
4. TTL/CMO OS
a) Se elect a proper rang
b) Co onnect the SYNC O
c) No ow the output sign
th he signal from 5V~
d) To o get a fixed TTL s
19.04.2011
ion
page 2 of this ma anual.
The internally or exte ernally generated f
unit t of display is indic cated by a LED (M
Ligh hts up when the fr requency is beyon
This s indicator flashes when the counter
Can be used to select t a frequency rang
rota ary control [8].
To s select the output w waveform (sine –
or p pulse with the pus h/pull rotary knob
Pres ss this button for 3 30dB attenuation
Use d in combination w with the RANGE-b
Whe en the knob is pul led, the symmetry
duty y cycle of the puls se can also be adju
sym mmetrical.
Use this knob to adju st the output amp
With h this knob in the pulled-out positio
turn ning it clockwise (+ +) or anticlockwis
pres ssed down.
Whe en the knob is in t the pulled-out pos
pres ssed in, the synch ronizing signal is
The output waveform m is a TTL pulse tha
This s input is used to c control the freque
This s jack sends out th he signal of the se
The output impedanc e is 50Ω.
on/o off switch
pow wer cable input soc cket
fuse e: F1A/250V (5x20 0mm)
230 V/115Vac selecto r
Whe en the button is pr ressed, the device
rele ased, the device m measures the inte
Pres ss this button to a attenuate an exter
Inpu ut terminal for the e external counter
efore connecting t the DVM20FGCN
your local mains p power system (11
the setting duri ng operation.
provide various ki nds of waveforms
e wave
form (sine – squar re – triangle) by p
ropriate range but tton [5]. Adjust th
UT jack [15] to an n oscilloscope (not
UDE knob [10] to control the amplit
are wave button [ [6], select a prop
PULSE knob [9] a nd rotate it to adj
ngle wave button [6], select a prop
PULSE knob [9] a nd rotate it to adj
ge [5] and set th e desired frequen
OUTPUT [13] to a an oscilloscope (no
nal is CMOS squar re wave. Rotate th
~14V.
square wave, pull out the CMOS LEV
DVM20FGCN N2
frequency is displa
MHz – KHz – Hz)
d the selected ran
r is working.
ge (7steps) in com
square – triangle)
b RAMP/PULSE [9]
(released, there i
buttons [5] to sele
y is adjustable and
usted (20~80%).
plitude.
on you can set the
se (-). The DC volt
sition, the Synchro
CMOS and amplit
at can be used as
ency through an ex
elected waveform
e measures an ext
ernal frequency.
rnal signal by 20dB
r signal.
to the mains, ma
0 or 230Vac).
s. An oscilloscope
pressing one of the
he knob FREQUEN
t incl.) to observe
tude of the wavef
er range [5], and
ust the width of t
per range [5], an
ust the slope of th
cy [8].
ot incl.) to observe
he CMOS LEVEL [1
VEL knob [12].
4
ayed.
nge.
mbination with the FREQUENCY
). Select a positive e/negative ramp
].
s no attenuation = = 0dB).
ect the output freq quency.
d the slope of the ramp and the
If pushed in, the waveform is
e DC voltage of an y waveform by
tage is 0 when the e knob is
onizing signal is TT TL pulse; when
ude is adjustable
a synchronising s signal.
xternal source.
in the selected fre equency range.
ternal frequency. When it is
B.
ke sure the AC se elector [18]
(not incl.) is one o of the best way
e buttons [6]; sel ect a frequency
NCY [8] to set des sired frequency.
the output signal .
form.
d set the desired f requency [8].
he pulse.
d set the desired frequency [8].
he ramp.
e the output wave eform.
12] to change the e amplitude of
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