Models AVRQ-2-B and AVRQ-4-B are suitable for generating the high-speed, high-voltage waveforms necessary for transient immunity testing of opto-couplers and other semiconductor devices. The AVRQ series is also suitable for a range of other applications requiring a highvoltage sweep waveform, such as sweep-control of particle beam systems.
The AVRQ-4-B offers four pulse amplitudes (-1.5kV, -1kV, +1kV and +1.5 kV), with the transition time (10%-90%) of the leading edge variable from less than 25 ns to more than 250 ns. Rather than connecting a load using a rearpanel connector, the AVRQ-4-B provides a daughterboard arrangement for the user's opto-couplers. The high-voltage pulse is applied between the floating ground on the input side (GND1) and the chassis-ground on the output side (GND2). A user-supplied 9V battery is installed to provide a floating regulated 5V power source (VCC1), which may be used to power a voltage-drive device directly, or it may be connected through a series resistance to drive currentbiased devices. A chassis-ground-referenced power supply (VCC2) is provided on the output side, and is adjustable from +3V to +8V.
The AVRQ-4-B provides a pattern of pin sockets into which a daughterboard may be plugged. Several daughterboards are included with each AVRQ-4-B, to accommodate common test configurations for common 8-pin DIP voltagedrive and current-drive optocouplers. The logic inputs on voltage-drive opto-couplers are jumpered to VCC1 or GND1, as appropriate. For current-drive optocouplers, the
LED anode is connected to GND1 directly or to VCC1 through a series resistor. The output side of the daughterboard includes provision for installing a pull-up resistor to VCC2, if required. To perform tests with different logic-level inputs or values of pull-up resistance, different daughterboards must be plugged in. Jumpers are provided to configure the daughterboards for single or dual-channel pinouts.
