41
Subject to change without notice
Referred to the trace position 0 V a DC voltage may be measured
after the input was returned to the signal.
33.3 Invert On Off
The pushbutton will alternate between not inverted and inverted.
An inverted signal will be indicated in the readout by bar above
the channel symbol. The trigger signal taken from an input will
not be affected.
33.4 Probe menu
This pushbutton opens the ”CH2 probe“ submenu.
33.4.1
*1 - *10 - *100 - *1000
A selection of 4 factors can be made, the factor chosen will be
automatically taken into account for all displays and measu-
rements.
33.4.2
auto
If ”auto“ was selected HAMEG probes with special probe iden-
tifi cation connectors will be automatically identifi ed and the
appropriate factor taken into account. The probe factor identifi ed
will be shown behind ”auto“.
Probes without that special connector will be treated as 1:1
probes (display ”auto*1“), for those the factor must be manu-
ally set.
33.5 Variable On Off
If the variable is on VAR on the pushbutton will be illuminated
and indicates that the sensitivity is now uncalibrated, the readout
will show ”
>
“ instead of ”:“ (e.g. ”CH2
>
5 mV“) The results of
cursor measurements will be identifi ed accordingly.
The VOLTS/DIV-SCALE-VAR knob
of CH2 has now the
function of variable, the sensitivity can be varied between
1 mV/cm to
>
20 V/cm.
INPUT CH1 – BNC connector
This is the CH1 signal input connector. In Yt mode it is a Y input,
in XY mode it is the X signal input. The connector housing is
connected to the instrument housing and thus to safety ground.
The ring around the connector is the probe identifi cation contact,
no voltage may be applied here.
INPUT CH2 – BNC connector
This is the CH2 signal input connector. It is a Y input in Yt and
XY mode. The connector housing is connected to the instru-
ment housing and thus to safety ground. The ring around the
connector is the probe identifi cation contact, no voltage may
be applied here.
C o n t r o l s a n d R e a d o u t
will be displayed. Then XY should be selected. In XY DSO mode
both channels may be inverted.
32.6 Bandwidth Full/20 MHz
This pushbutton will select full or 20 MHz bandwidth.
Full:
Full bandwidth will be the one given in the specifi cations.
20 MHz:
Provided measuring modes allow full bandwidth
(i.e.
≥
5 mV/cm) this can be reduced to 20 MHz (–3 dB) in order
to attenuate high frequency noise e.g. The readout will show
BWL = bandwidth limited. The bandwidth limitation affects both
channels and pertains to analog and DSO modes.
In XY DSO mode the limitation is equal to Yt mode. In XY analog
mode the limitation affects only CH2.
CH2 pushbutton
This pushbutton opens the CH2 menu which offers the following
options:
33.1 AC DC
The pushbutton will alternate between AC and DC coupling.
The readout shows a ”~“ or ”=“ symbol behind the sensitivity
indication.
33.1.1
DC coupling
The signal will be directly coupled to the input amplifi er via
the BNC connector
and the input attenuator. The input
resistance of the scope is a constant 1 MΩ irrespective of the
sensitivity selected.
33.1.2
AC coupling
A capacitor is inserted between the BNC connector and the at-
tenuator, thus the DC content of the signal is blocked and a high
pass with a lower cut-off frequency of approx. 2 Hz is created.
Low frequency signals will thus be more or less differentiated,
hence their shape and amplitude affected.
If the DC content of the signal changes, e.g. the duty cycle of
pulses, the capacitor must charge or discharge. This will cause
a momentary Y shift of the display.
33.2 Ground (GND) On Off
The pushbutton will alternate between switching the amplifi er
input to the signal or to ground.
If the signal is disconnected resp. the amplifi er input connected
to ground the readout will show a ground symbol behind the
sensitivity indication. In automatic trigger mode the trace will
be visible in a reference position which can be used as a 0 V
ground reference. The readout will show a symbol ( ) for 0 V
which will be close to the vertical centre line of the graticule, it
is the zero reference for any measurements.
AUXILIARY INPUT
TRIGGER
EXTERN
Z-INPUT
AUX
1M
Ω
II
15pF
max
100 Vp
INPUTS
1M
Ω
II15pF
max
400 Vp
X-INP
CH 1
VERT/XY
CH 2
HOR
MAG
CAT I
!
CAT I
!
VAR
VAR
VAR
x10
POWER
36
37
29
35
34
31
32
33
30
