Model M25K-50-N
High Voltage Pulse Generator

25,000 volts - 50 Watts Average Power
Variable Width

The Model M25k-50 is a general purpose laboratory instrument which operates under dynamic load conditions. The maximum current of 3 amps permits operating with small load resistances or with high impedance loads which require a parallel "pull down" resistor to decrease fall time. This is a single switch pulser with pulse fall time a function of load RC. The instrument consists of a hard tube switch and multi-range solid state TTL driver. The pulser generates clean negative pulses into dynamic loads.

Applications______________________________
m1k-20 pic
(large scale)
  • Physics/Chemistry Research
  • Semiconductor Materials Research
  • ION Tube Driver
  • Electric Fields in Aqueous Solutions
  • Parallel Plate Experiments
  • Beam Steering
  • High Voltage Testing
  • Time of Flight Mass Spec
  • Liquid Cells
  • Crystal Driver

Typical Waveform: 25 kV, 4 µs

Operating Features_____________________________________
  • Power Supply Digital Panel Meter
  • Local/Remote with Electrical Interface
  • Front Panel HV On Control and Indicator
  • Front Panel HV Off Control and Indicator
  • Front Panel Pulse Amplitude Adjustment
  • Built-in HV Pulse Multirange TTL Pulse Generator Driver
    1. Continuously Variable Width and Rate
    2. Trigger/External Pulse/Gated Modes
  • Integral Pulse Voltage and Current Monitor
  • System Status LED's
Safety Features____________________
  • Zero Restart on High Voltage On (requires voltage to be set to zero before restart)
  • Auto Shut-down with Excessive Average Power Supply Current
  • External Interlock
Pulser Performance Specifications_____
The following specifications represent typical values. The specifications below are for two load conditions: 10 kohm and 100 kohm resistive load, each connected by a two foot coaxial cable.

External Load 100k/40pF 10k/40pF
Pulse Parameters
Pulse Amplitude, adjustable 1.5 to 25 kV 1.5 to 25 kV
Polarity (factory set) negative negative
Droop (%/µs) 0.005 0.08
Pulse Width (at 50%) 3 to 1000 µs 3 to 100 µs
Rise Time (10% to 90%) < 1000 ns < 1200 ns
Fall Time
2.2 RC (load dependent)		 < 15 µs < 2 µs
Max Rep Rate (see graph) > 2 kHz > 300 Hz
Duty Cycle > 0.8% > 0.08%
HV Power Supply
  • max average current
  • load and line regulation

1.9 mA
1.9 mA
±0.1%
±0.1%

Internal Multi-range Driver Specifications______
The internal driver is a general purpose modular TTL pulse generator which is the driver for the high voltage switch. The drivers operating range greatly exceeds that of the high voltage switch. If the high voltage switch is driven outside its operating range, the pulser will automatically shut down.
Specifications:
  • Pulse Width
  • Rise Time
  • Fall Time
  • Repetition Rate
  • Sync Pulse Out
  • External Trigger In
10^-7 to 0.01 seconds
< 50 ns
< 50 ns
1 to 10^4 Hz
1.5 volts (50 ohms)
4 to 10 volts
Modes:
  • External Pulse - HV Out Follows External Pulse In
  • External Trigger - HV Out Pulse Width Set Internally, Rep Rate Set by External Input
  • Gated - HV Out Width and Rate Set Internally, Number of Pulses Out Set By Gate On Time
  • Internal - HV Out Width and Rate Set Internally
  • Pulse Enable Button on Front Panel with LED Indicating Pulse Drive On/Off


Figure 1 - 100 kohm, 40 pF load
Figure 2 - 10 kohm, 40 pF load

Front Panel Functions

    Line Power On/Off with Indicator
    Pulse Parameter Controls (Mode, Width, Rate, Sync Out, Ext In)
    High Voltage Controls Status

Back Panel Functions

    Line Power In - IEC Connector and EMI Filter
    Fuse (3AG, 2 amp, SLO BLO)
    External Interlock - 2 position Terminal Block
    High Voltage Out - HV Pulse HV-1 Connector
    Pulse Current Monitor - BNC (1 v/a into 50 ohms)
    Pulse Voltage Monitor Out - BNC (1000:1, into high Z)
    System Ground Bolt - 1/4-20 Bolt and Nut
    Local/Remote Toggle Switch
    Remote Interface (DB9 Connector) - See Electrical Interface

Electrical Interface - DB9
Pin 1 Remote HV On/Off (On = +2.5 to +12 V DC)
Pin 2 Remote HV Supply Program (0 to 5 V DC)
Pin 3 HV Enable Out (Disabled = 0, Enabled = 5 V DC)
Pin 4 Power Supply Average Current Monitor
Pin 5 Ground
Pin 6 N/C
Pin 7 N/C
Pin 8 Power Supply Voltage Monitor
Pin 9 Pulse Enabled
Mechanical and Line Power
Line In 110 to 120 vac, 50/60 Hz, 1.5 amp
Size 17 in h, 17 in w, 21in d (43 cm h, 43 cm w, 53 cm d)
Weight 45 pounds (20 kg)
Operating Temperature 10 to 40°C
Options
Rack Mount
Line Power 220 to 240 vac, 50/60 Hz
Connectors Package of 10, HV-1 Connector Kits

Warranty Information

HV Pulse products are warranted against defects in materials and workmanship. This limited warranty is valid for one year from the date of shipment.

HV Pulse reserves the right to make changes in this specification at any time without notice. The information furnished in this specification is believed to be accurate; however, no responsibility is assumed for its use.

Copyright © 2002 HV Pulse Technologies, Inc.

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