OEM QBX-08 User manual

rev 1.02 / 2021 05 28
QBX-08 Pockels cell driver
User manual
Warning! This equipment produces high voltages that can be very dangerous.
Please read user manual before starting operations.

Overview
QBX-08 is a dedicated Pockels cell drivers designed for applications where
voltage on the Pockels cell should be continuously adjustable. Driver is built
on voltage amplifier schematics, maximal output voltage is 800V (other
voltages both smaller and higher up to 1600V are available on request),
amplification factor is 100:1.
Driver is forced air cooled with integrated fan. Driver can be supplied in
PCB and enclosed versions.
Appearance

Connections, signals, signal descriptions
INPUT: BNC
Analog signal of 0-8V amplitude applied to this connector is amplified with
100:1 factor and delivered to the high voltage output of QBX-08 Pockels
cell driver.
Input impedance is 50 Ohm.
24VDC/INTERFACE: D-SUB 9 PIN, FEMALE
PIN (color)
DESIGNATION
DESCRIPTION
1, 2 (black)
24VDC RETURN
+24VDC power supply to be connected
here. Power consumption 1.5A max.
We recommend to use +24VDC power
supply with isolated output and non-
grounded return.
3, 4 (red)
+24VDC
5
N/C
-
6
Enable
5V TTL signal to be applied here to enable
the high voltage output.
Enable signal could be used instead of
Enable switch and they shouldn’t be used at
the same time.
7
Enable return
8
Ready
Exactly as Ready LED, indicates the
Pockels cell driver is enabled and ready to
work.
9
Ready return

ENABLE SWITCH
UPPER
POSITION
ON
Enable switch turned to ON position
enables the high voltage output.
Enable switch could be used instead of
Enable signal of interface and they
shouldn’t be used at the same time.
BOTTOM
POSITION
OFF
HV OUTPUT: Phoenix Contact 1757268
PIN (color)
DESIGNATION
DESCRIPTION
1
HV OUTPUT
High voltage output (amplified INPUT) of
the QBX-08 driver.
4
GND
2, 3
N/C
-
Mating part (Phoenix Contact 1758377) is supplied together with the driver.
LEDs
There is a Ready LED onboard indication the driver is ON and ready to
work.
Grounding and mounting
Grounding policy
By default INPUT negative, HV OUTPUT negative and 24VDC return (via filtering choke)
are interconnected to each other and to chassis ground (through the mounting pads).
Driver is to be mounted with four M3 screws.

Operations
1. Connect +24VDC power supply, waveform generator and Pockels cell
2. Turn on +24VDC power supply
3. Turn ENABLE SWITCH in ON position or apply ENABLE signal
4. Turn on waveform generator and apply desired waveform to INPUT
Typical output
Examples of waveforms:

Specifications
ELECTRICAL SPECIFICATION
Input
Power
24VDC, 1.5A typ.
Signal
Analog signal 0-8V,
input impedance 50Ohm
HV Output
Output type
High voltage signal repeats the shape
of low voltage input signal
Output polarity
Positive
Amplitude
0-800V (100:1 amplification)
Repetition rate
Up to 1MHz (at smaller loads and
voltages).
Also limited as fMAX*C*U2=2W, for
example:
~50kHz @ 800V and 60pF
~130kHz @ 500V and 60pF
Rise/fall time (full slope)
<1us (1 microsecond)
Delay time
<1us
Load requirements
Load type
Capacitive (other on request)
Load capacitance
<60pF (other on request)
Cooling
Forced air cooling with integrated fan
Environmental
Operating temperature
+10…+40C
MECHANICAL SPECIFICATION
Size (LxWxH)
206x85x45 mm3 (see also the
dimensional drawing below)
Weight
Approx. 0.6 kg

DIMENSIONAL DRAWINGS
PCB version
Enclosed version