Construction
The Voltage Drop Simulator VDS 200Q200.2 and VDS 200Q150.2 are built into two parallel 19" racks and is
divided into several parts: the control unit, the power stage and the power supply. All other models are built into a
single 19” rack.
Overvoltage protection
General
With the overvoltage protection the user can protect the output voltage in case of an unwanted overvoltage at the
VDS200Qxx.2 output in case of wrong voltage setting or failure. The overvoltage protection is limited by
restricting the power supply that powers the amplifier stage. The option to set 40V or 80V is found under the
Service menu.
Sense Lines, if equipped, are for maximum of 8V cable losses.
CAUTION:
While the output of the VDS 200Q is floating, The battery negative pole should be within 10V of
earth for safety reasons.
Do not put the simulator in parallel with other sources.
Output Behavior
The VDS 200Q is a four-quadrant source. Four-quadrant operation means that the VDS 200Qxx.2 can source
and sink current using a programmed voltage in both polarities, as well as voltage in both polarities.
Please note that if a DUT has an input capacitance, this will be discharged through the VDS if the VDS voltage is
reduced below that stored in the capacitor, i.e. the DUT will be completely discharged if the voltage is set to zero.
Likewise, when generating a sine wave, the full power of the amplifier can be applied to a capacitive load. The
current limit of the VDS 200Qxx.2 applies also to AC operation, like is often found in sinusoidal variations. One
must consider the capacitive reactance at the necessary test frequency when determining if a test could be
performed with a certain DUT.
The full range of voltage and bandwidth can be used with the VDS 200Qxx.2. You are only limited by the
maximum and minimum voltage, as well as the maximum frequency, as set.
For example, both of the following simulations are possible at well over 100 kHz:
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