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The amplitude can be entered either as a peak-to-peak value in
V
or as a rms value in V
, selectable by the button pp/rms of
pp
rms
the keyboard. Please note that an indication of V
not be valid for arbitrary functions, also, any offset superposed
will not be included.
If a 50 ohm load is connected the actual amplitude
will be half of the displayed value!
In case there is no load on the output or a load
diferring from 50 ohms it is advisable to check the
STOP
amplitude with a HAMEG scope.
HINT
In the function amplitude modulation the maximum
voltage levels in the various ranges are cut in half,
the maximum output voltage is limited to 10 V
The output voltage has 3 ranges:
STOP
full range
range 1
20,0 mV
– 200 mV
pp
range 2
201 mV
– 2000 mV
pp
range 3
2,01 V
– 20,00 V
pp
The output stage limits the available output voltage
to 20 V
. With offset added the maximum available
pp
output voltages are: 10.00 V
according to range.
STOP
Selection of offset voltage
[OFFS] (Offset)
Offset: 1.00
V
- val + < cur >
A positive or negative offset can be added to the output signal
using the button [OFFS]. The value is selected as described for
the amplitude via the keyboard
no load output offset voltage is ±5 V in range 3; the maximum
voltages in the other ranges are scaled accordingly.
’
The LED
will indicate the presence of an offset on the out-
put.
Maximum offset voltage
The maximum offset voltage is limited according to the range
or V
pp
rms
.
pp
half range
10,0 mV
– 100,0 mV
pp
pp
101 mV
– 1000 mV
pp
pp
1,01 V
– 10,00 V
pp
pp
pp
, 1.000 V
, 100.0 mV
p
p
•
”
or the knob
. The maximum
S t r u c t u r e a n d u s i n g o f t h e m e -
selected, e.g. it is not possible to select a 5 V offset and a 20 mV
signal voltage. Within a range the offset is continuously variable
will
from minus maximum to plus maximum, however, values below
10 mV can not be chosen.
Range 1: 20.0 mVpp – 200 mVpp
Range 2: 201 mVpp – 2000 mVpp
Range 3: 2.01 Vpp – 20.0 Vpp
The sum of signal and offset voltages is limited to
the maximum output voltage (no load) of 20.00 V
– 2.000 V
HINT
pp
The picture shows 2 signals. The lower curve without offset with
10 V
. Also shown are the limits of the output stage + and –10
pp
Vp. The upper curve is offset by +5 V and reaxches the upper
limit of the output stage. Thus an increase of the offset e.g. to
6 V is impossible. Neither is it possible to increase the signal
amplitude as this would also go beyond +10 Vp.
pp
pp
If you decrease the offset to 4 V you can increase
the amplitude to 12 V
HINT
The instrument will refuse the entry via the key-
p
board of any offset value larger than the maximum
allowed in the range selected. The former offset
value will remain valid, an error message will be
displayed. Neither will the menu pushbuttons
STOP
nor the knob ” allow entry of any offset larger than
permissible. This is also valid for the sweep func-
tion.
Using amplitude modulation the maximum voltage
is 10 V
. Adding an offset here should be avoided,
pp
however, if the amplitude is 8 V
STOP
STOP
may be added. The output is protected against
short-circuit or overload for about 30 sec. Over-load
means: extern voltage (AC + DC) >15 V or load < 50
ohms. In worst case the fi nal stage will be dama-
ged.
Sweep mode
SWP. (Sweep)
** SWEEP ACTIVE **
Start Stop Time Lin
The sweep mode is selected by pressing the button [SWP] in
“
. Parameters may be changed while in this mode, the output
will follow. If parameters should be chosen before selecting
the sweep mode, select the main menu 1 and go to "Sweep",
now you can set the parameters. By pushing [SWP] the sweep
maximum offset ±50 mV
maximum offset ±500 mV
maximum offset ±5 V
– 200.0 mVpp in the 3 ranges.
.
pp
, an offset of ±2 V
pp
Lin: "Select linear
or logarithmic"
SweepTime: 1.00 sec
- val + < cur >
Sp:
10.0000
kHz
- val + < cur >
St:
1.0000
kHz
- val + < cur >
Subject to change without notice
pp
49
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