Section 1 – Introduction
TOELLNER Electronic Instrumente GmbH
1. Introduction
The electronic switches of the TOE 9261 series are used for time-specific switching on and
off of load and signal currents. These devices use an electronic, unidirectional power switch
as well as four electronic bidirectional signal line switches. The power switch can be used
either to switch a positive supply line or to switch the return line, e.g. for ground interruption
tests. When using the switch in the positive supply line, a branch path parallel to the load can
be additionally connected for specific discharging of buffered loads.
A digital input signal can be used to generate on and off durations of any length down to the
microsecond range for both the power switch and the signal line switches.
Series TOE 9261 switches are therefore ideal for use in test systems or any other
applications where current paths from consumers or control devices need to be closed or
interrupted for defined time intervals.
1.1 Features
1.1.1 General feature set
An essential feature of the series TOE 9261 electronic switches is the electronic power
switch, which is constructed of a longitudinal path and a branch path. Both paths can be
used unidirectional, i.e. with a fixed, specified current direction.
In order to switch a positive supply line, the longitudinal path represents the actual switching
path via which the energy flow takes place from a feeding source to the connected
consumer.
The branch path in this case is arranged parallel to the consumer and can be optionally
connected via a DIL switch. It serves as needed to selectively discharge a buffered
consumer or a buffered load during the turn-off phase of the longitudinal path. It is possible
to select either a direct parallel connection to the consumer or a parallel connection via a
0.1 Ω series resistor.
DIL switches are used to continually switch resistances of 10 kΩ or 100 kΩ to the output as
high-impedance base loads, i.e. parallel to the consumer.
If the return line of the load is switched, the switch otherwise used as branch path carries the
load current. Base load impedances parallel to the consumer are not available in this
configuration.
The switching states of the power switch as well as the states of the selectable elements for
the load circuit are displayed by LEDs.
Another feature of the series TOE 9261 electronic switches are the four electronic
bidirectional signal line switches, which can be operated selectively in any direction. These
signal line switches are used to switch low currents such as occur on control or signal lines.
Control of the switching states of as well as the power and signal line switches is
accomplished as desired using a front panel or rear BNC input. A DIL switch can be used to
internally invert the control signal.
A further DIL switch can be used to connect a pull-up resistor to the BNC input, thus making
possible control using an open collector or open drain switch.
The BNC inputs are compatible with TTL levels as well as CMOS 5 V and LVCMOS 3.3 V.
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