Instruction manual

23
Subject to change without notice
trigger coupling for the B time base. As the instrument
contains a separate trigger unit for the B time base, the
trigger level and slope can be set independently using
the same controls used before for the A time base trigger
setting. The trigger point is indicated again but has the
added letter B in the readout.
In delay trigger mode (DEL.TRIG.), the delay signal first
must elapse. Then the next suitable signal slope
(direction and height) starts the B time base. If those
basic requirements are not met, the trace is blanked in
analog mode and the signal acquisition is stopped in
digital mode. Under the condition that the signal contains
several suitable slopes after the delay time, it can be
seen in alternate time base mode that the delay time
setting (DEL. POS.) now causes the intensified sector
to jump from one slope to the other.
VAR.
ANALOG MODE ONLY
Pressing and holding the DEL.TRIG. - VAR. pushbutton
selects the TIME/DIV. (29) control knob function
between time base switch and vernier (variable). The
current setting is displayed by the VAR-LED located
above the knob.
The variable function can be activated for the A time base
or the B time base, the settings are stored separately. As
alternate time base mode is a B time base sub mode,
only the B time base is affected in this operation.
A time base:
After switching the VAR-LED on, the time deflection
coefficient is still calibrated. Turning the TIME/DIV. (29)
control knob counter clockwise increases the time
deflection coefficient (reduces the deflection speed) and
the deflection coefficient becomes uncalibrated. Instead
of e.g. “A:10µs”, the readout then displays “A>10µs”
indicating the uncalibrated condition.
This setting is stored if the instrument is switched to
alternate or B time base mode.
Pressing and holding the DEL.TRIG. - VAR. pushbutton
again in A time base mode switches the VAR.-LED off,
the time base switch function on, and sets the time
deflection coefficient back into the calibrated condition.
ALTERNATE or B time base.
In alternate as well as in B time base mode, pressing
and holding the DEL.TRIG. - VAR. pushbutton selects
the TIME/DIV. knob function between B time base
switch and B vernier (VAR. -LED on). In the latter case
the TIME/DIV. knob can be used in the same way as
described before under A time base condition.
STORAGE MODE ONLY
Pressing and holding the DEL.TRIG. - VAR. pushbutton
causes no reaction, as a variable time deflection
coefficient setting is not possible in storage mode.
Underneath the front panel sector described before,
the BNC sockets and four pushbuttons are located.
(32) INPUT CH I – BNC socket.
This BNC socket is the signal input for channel I. In XY
mode, signals at this input are used for the Y deflection.
The outer (ground) connection is galvanically connected
to the instrument ground and consequently to the safety
earth contact of the line/main plug.
(33) AC / DC - Pushbutton with two functions.
Input coupling:
Briefly pressing this pushbutton switches over from AC
(~ symbol) to DC (= symbol) input coupling and vice
versa, if the INPUT CHI (32) is not switched to GD (34).
The AC/DC setting is displayed in the readout with the
deflection coefficient.
Probe factor:
Pressing and holding the pushbutton selects the indicated
deflection coefficient of channel I displayed in the readout,
between 1:1 and 10:1. In condition 10:1 the probe factor
is thus indicated by a probe symbol displayed by the
readout in front the channel information (e.g. ”probe
symbol”, Y1...). In the case of cursor voltage measu-
rement, the probe factor is automatically included.
Please note:
The probe symbol should not be activated unless
a x10 (10:1) attenuator probe is used.
(34) GD
INV. - Pushbutton with two functions.
GD
Each time this pushbutton is pressed briefly, the INPUT
CHI is switched from active to inactive and vice versa.
It is displayed in the readout as an earth (ground) symbol
instead of the deflection coefficient and the ~ (AC) or =
(DC) symbol.
The GD setting disables the input signal, the AC/DC (33)
input coupling selection and the VOLTS/DIV (21) knob. In
automatic trigger mode the undeflected trace is visible
representing the ”0 Volt” trace position. See Y-POS. I (14).
INV.
Pressing and holding this pushbutton switches the
channel I invert (INV.) function on or off. The invert ”on”
condition is indicated by the readout with a horizontal
bar above ”Y1” (Yt mode) or ”Y” (XY mode). The invert
function causes the signal display of channel I to be
inverted by 180°.
(35) Ground socket - 4mm banana jack galvanically con-
nected to safety earth.
This socket can be used as a reference potential con-
nection for DC and low frequency signal measurement
purposes and in COMPONENT TEST mode.
(36) INPUT CH II – BNC socket.
This BNC socket is the signal input for channel II. In XY
mode, signals at this input are used for the X deflection.
The outer (ground) connection is galvanically connected
to the instrument ground and consequently to the safety
earth contact of the line/main plug.
(37) AC / DC - Pushbutton with two functions.
Input coupling:
Briefly pressing this pushbutton switches over from AC
Controls and Readout
BK Precision