OEM-TECH QBX-16 Pockels Cell Driver User Manual

: June 15, 2024
: OEM Tech

Table of Contents

Overview
Appearance
Operations
Typical output
Specifications
Dimensions
References
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OEM-TECH QBX-16 Pockels Cell Driver

Warning! This equipment produces high voltages that can be very dangerous.
Please read user manual before starting operations.

Overview

QBX-16 is a dedicated Pockels cell driver designed for applications where the voltage on a Pockels cell should be continuously adjustable. The driver is based on voltage amplifier schematics, the maximum output voltage is 1600V, the amplification factor is 300:1.
Driver is air-cooled with built-in fans. Driver is available in PCB version only.

Appearance

Connections, signals, signal descriptions

INPUT: BNC

Analog signal of 0-5.33V amplitude applied to this connector is amplified with 300:1 factor and delivered to the high voltage output of QBX-16 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 3.5A max. We recommend to use +24VDC power supply with isolated output and nonrounded 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.

In the case of the Fault, the driver should be
disabled and enabled again to resume the
operations.

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.

In the case of the Fault, the driver should be disabled and enabled again to resume the operations.

---|---|---
BOTTOM POSITION| OFF

LEDs

There is a Ready LED onboard indication the driver is ON and ready to work.

HV OUTPUT: Phoenix Contact 1757268 (2pcs)

J2 (Left connector on the picture above):

PIN (color)	DESIGNATION	DESCRIPTION
1	HV OUTPUT NEGATIVE (HV-)	High voltage output (negative swing)

of the QBX-16 driver.

Positive and negative parts can be used independently.

4| GND
2, 3| N/C| –

J1 (Right connector on the picture above):

PIN (color)	DESIGNATION	DESCRIPTION
1	GND	High voltage output (positive swing) of the QBX-16 driver.

Positive and negative parts can be used independently.

4| HV OUTPUT POSITIVE (HV+)
2, 3| N/C| –

Mating part (Phoenix Contact 1758377) is supplied together with the driver.

Grounding and mounting

Grounding policy
By default, INPUT is galvanically isolated from HV OUTPUT. HV OUTPUT GND 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 M4 screws.

Operations

Connect +24VDC power supply, waveform generator and Pockels cell
Turn on +24VDC power supply
Turn ENABLE SWITCH in ON position or apply ENABLE signal
Turn on waveform generator and apply desired waveform to INPUT

Typical output

Examples of waveforms:

Specifications

ELECTRICAL SPECIFICATION

Input|
---|---
Power| 24VDC, 3.5A typ.
Signal| Analog signal 5.33V, input impedance 50Ohm
HV Output|
Output type| High voltage signal repeats the shape of low voltage input signal
Output polarity| Bipolar
Amplitude| 0-1600V (300:1 amplification)
Repetition rate| Nominal performance : 50kHz @ 1600V and 60pF Maximum repetition rate :

Up to 300kHz (at smaller loads and voltages).

Average power limitation : Performance is also limited as fMAXCU2=8W, for example:

~50kHz @ 1600V and 60pF
~130kHz @ 1000V and 60pF