Directed Electronics PVM-4210 User Manual
DEI PVM-4210
DIRECTED ENERGY, INC.
PVM-4210
±950V Pulse Generator Module
OPERATION MANUAL
Directed Energy, Inc.
2401 Research Blvd., Ste. 108
Fort Collins, Colorado 80526
970/493-1901 FAX 970/493-1903
DEI PVM-4210
DEI PVM-4210
Table Of Contents
1.0 Safety...........................................................................................................3
2.0 Overview.....................................................................................................3
3.0 Specifications..............................................................................................6
4.0 Connector Pin-Outs And User Adjustments................................................7
4.1 Polarity Reversal ...............................................................................7
4.2 Power Supply Enable ........................................................................9
5.0 OPERATING INSTRUCTIONS ....................................................................10
5.1 Output Cabling ..................................................................................10
5.2 Load Interconnection.........................................................................10
5.3 Power-Up Procedures .......................................................................10
6.0 TROUBLESHOOTING.................................................................................11
6.1 Troubleshooting Procedures .............................................................11
6.2 Factory Service .................................................................................12
7.0 WARRANTY ................................................................................................12
APPENDIX.........................................................................................................14
Mechanical Dimensions And Mounting Hole/Connector Location
Drawing...................................................................................................14
Document Number 9100-0201 Rev 8
Directed Energy, Inc. 2000-2002
Page 1
DEI PVM-4210
********** WARNING **********
SAFE OPERATING PROCEDURES AND PROPER
USE OF THE EQUIPMENT ARE THE
RESPONSIBILITY OF THE USER OF THIS
SYSTEM.
Directed Energy, Inc (DEI) provides information on its
products and associated hazards, but it assumes no
responsibility for the after-sale operation and safety
practices.
ALL PERSONNEL WHO WORK WITH OR ARE
EXPOSED TO THIS EQUIPMENT MUST TAKE
PRECAUTIONS TO PROTECT THEMSELVES
AGAINST POSSIBLE SERIOUS AND/OR FATAL
BODILY INJURY.
Document Number 9100-0201 Rev 8
Directed Energy, Inc. 2000-2002
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DEI PVM-4210
1.0 Safety
The high voltage/high current nature of this device dictates the use of
caution when operating or servicing this equipment. OBSERVE ALL
SAFETY PRECAUTIONS LISTED BELOW. FAILURE TO DO SO COULD
RESULT IN SERIOUS INJURY.
Precautions:
1. The Pulser should be serviced only by personnel experienced in high
voltage pulsed power systems.
2. Service personnel should be instructed to observe all safety precautions
as stated in the operating instructions, and those safety precautions
standard to the high voltage pulsed power community. Failure to do so
could result in serious injury.
3. Do not handle the load or terminations, or remove the input or output
cables, while the driver is in operation. Ensure that the high voltage
power supplies have fully discharged before handling the load. Failure to
observe these precautions can result in potential electric shock to
personnel, arcing, and damage to the connectors and system.
4. The Pulser contains reference planes which are elevated to the potential
of the output pulse. Extreme caution should be exercised when servicing
the equipment.
5. Pulsed power systems are capable of random triggering via transients
and therefore when the driver is turned on, or high voltage is present in
the module, assume it is possible to get a pulse on the output cable.
2.0 Overview
The PVM-4210 is a compact, OEM-style pulse generator module providing
two simultaneous differential voltage pulses of up to ±950V (1,900V
differential), with pulse rise and fall times <15 nanoseconds, and pulse
widths continuously adjustable from <40 nanoseconds to DC. The pulser
operates on +24VDC to +28VDC support power, and features integrated
DC high voltage power supplies.
The PVM-4210 is optimized for differential drive of deflection plates for
electrostatic modulation of particle beams in time-of-flight mass
spectrometers and accelerators. It will also drive any high impedance,
capacitive load such as Pockels Cells and Q-Switches, electrodes,
microchannel plates, acoustic transducers, image intensifiers and
Document Number 9100-0201 Rev 8
Directed Energy, Inc. 2000-2002
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DEI PVM-4210
photomultiplier tubes. The exceptional pulse fidelity of the PVM-4210 will
optimize the performance of any system in which it is used.
The module provides two pulse output channels, controlled by a common
control logic. When the control logic receives a gate signal, both channels
pulse simultaneously. One channel pulses from ground to the positive high
voltage, and the other channel pulses from ground to the negative high
voltage. Therefore each output can be connected to the electrodes of a
Pockels Cell or Q-Switch, or to a pair of deflection plates, providing a 1,900V
differential pulse across the cell or plates. These outputs may also be
inverted, to pulse from the high voltage potential to ground. The width and
frequency of the output pulses follow the width and frequency of the TTL
input gate. The amplitude of the output pulse voltage for each channel is
independently adjustable from 0 to 950V using screwdriver-adjustable
potentiometers readily accessible on the end panel of the pulser module.
The PVM-4210 requires +24VDC to +28VDC support power and a TTL (into
50Ω) gate signal. For safety and control flexibility, a TTL level signal is
used to enable and disable the DC power supplies. Each channel is a halfbridge (totem pole) design, offering equally fast pulse rise and fall times,
low power dissipation, and virtually no over-shoot, under-shoot or ringing.
The unit has over-current detection and shut-down circuitry to protect the
pulse generator against potential damage due to arcs and shorts in the load
or interconnect cables.
The block diagram below shows the main functional blocks of the pulser:
Document Number 9100-0201 Rev 8
Directed Energy, Inc. 2000-2002
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