QBD-BT-series is specially designed to control Pockels cells by applying a fast switching high voltage. The voltage level and operating frequency can be selected in working range by user through RS-232 or through the front panel. Triggering is carried out automatically or via a signal from an external device.
There are two possible modifications of output signal type:
• push-up (= normally off scheme), when a base voltage level equals to zero
• pull-down (= normally on scheme), when pulses from base bias voltage to ground are generated.
The desired one should be chosen at the time of ordering and could not be changed by user.
QBD-BT-series is based on MOSFET technology and offers high repetition rates and fast transition time for a leading pulse edge. The recovery time by QBD is relatively long (5-10 μs for the trailing pulse edge vs >20 ns by QBU-BT).
Input:
Output:
Modifications by working modes
pull-down (= normally on)
or push-up (= normally off)
Synchronization
internal and external
Voltage, high level
regulated, up to 6 kV
1
Voltage, low level
fixed, 0 V
Maximum repetition rate
up to 100 kHz 1 and higher (load and voltage dependant, see also manual)
Rise time (fall time)
< 20 ns
2
Recovery time
5-10 us (depends on load)
Load capacitance
up to 0.5 nF
1
Environment:
Operation temperature
0 … +40 °C (wider temperature range is available on request)
Storage temperature
-20 … +60 °C
Humidity
0 ... 90%, non-condensing
Other:
Size (LxWxH)
225x180x70 mm
1)
these parameters aren't indepenent and cannot achieve their maximum at the same time
2)
10-90% level, guaranteed at load capacitance 23 pF and below
Pull-down (normally on) modifications
Pull-down scheme,
2.4-6.0 kV high voltage adjustment range
Pull-down scheme,
2.0-5.0 kV high voltage adjustment range
Pull-down scheme,
1.6-4.0 kV high voltage adjustment range
Pull-down scheme,
1.2-3.0 kV high voltage adjustment range
Pull-down scheme,
0.8-2.0 kV high voltage adjustment range
Pull-down scheme,
0.4-1.0 kV high voltage adjustment range
(*) Other output voltages are available on request
Push-up (normally off) modifications
Push-up scheme,
2.4-6.0 kV high voltage adjustment range
Push-up scheme,
2.0-5.0 kV high voltage adjustment range
Push-up scheme,
1.6-4.0 kV high voltage adjustment range
Push-up scheme,
1.2-3.0 kV high voltage adjustment range
Push-up scheme,
0.8-2.0 kV high voltage adjustment range
Push-up scheme,
0.4-1.0 kV high voltage adjustment range
(*) Other output voltages are available on request
Example
Pull-down scheme,
2.0-5.0 kV high voltage adjustment range
