m1k-20 pic
(large scale)

Model M1K-20 High Voltage Pulser

1,000 volts - 20 Watts Average Power

Variable Width

The Model M1K-20 is a general purpose laboratory instrument which operates under dynamic load conditions. With a load current capability greater than 20 amps, load resistances to 50 ohms may be used, or 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 an IGBT switch and a multi-range solid state TTL driver. The pulser generates clean positive or negative pulses into dynamic loads.

Applications

    Piezo-Electric Driver
    Semiconductor Materials Research
    Electric Fields in Aqueous Solutions
    E-O Modulator
    RF Modulator
    High Voltage Testing

Operating Features

    Power Supply Digital Panel Meter
    Local/Remote Operation with Electrical Interface
    Front Panel High Voltage On Control and Indicator
    Front Panel High Voltage Off Control and Indicator
    Front Panel Pulse Amplitude Adjustment
    Built-in HV Pulse Multi-range TTL Pulse Generator Driver
      Continuously Variable Width and Rate
      Trigger/External Pulse/Gated Modes
    Integral Pulse Voltage and Current Monitor
    System Status LED's

Safety Features

    Zero Restart for 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: high impedance resistive load and 50 ohm resistive load connected by a three foot coaxial cable.

Parameter Units No Load 50 ohms/60 pF
Amplitude volts 100 to 1,000 100 to 840
Polarity (Factory Set)* negative/positive negative/positive
Maximum Peak Current amps >20 >20
Pulse Width (at 50%) µs 10 to 10,000 1 to 100
Rise Time (10% to 90%) ns <200 <200
Fall Time µs <10 <0.5
Droop % <2 <2
Max Rep Rate kHz >10 >0.8
Duty Cycle >25% >0.08%
* Switchable Polarity Available By Special Request - Consult Factory

Figure 1 - Load Resistance v. Duty Cycle
Figure 2 - Load Resistance v. Pulse Amplitude

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 10-7 to 10-2 seconds
Rise Time <50 ns
Fall Time <50 ns
Repetition Rate 1 to 104 hertz
Sync Pulse Out 3.5 volts (50 ohms)
External Trigger In TTL
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

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, 1 amp, SLO BLO)
    External Interlock - 2 position Terminal Block
    High Voltage Out - SHV Connector
    Pulse Current Monitor - BNC (0.1 v/a into 50 ohms)
    Pulse Voltage Monitor Out - BNC (1000:1, 50 ohms)
    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 = TTL High)
Pin 2 Remote HV Supply Program
Pin 3 HV Supply Enable Out (Enabled = TTL High)
Pin 4 Power Supply Average Current Monitor
Pin 5 Ground
Pin 6 Not Connected
Pin 7 Not Connected
Pin 8 Power Supply Voltage Monitor
Pin 9 Pulse Enabled (Enabled = TTL High)
Mechanical and Line Power
Line In 100 to 120 vac, 50/60 Hz, 1 amp
Size 7 in h x 17 in w x 17 in d (18 cm h x 43 cm w x 43 cm d)
Weight 15 pounds (7 kg)
Operating Temperature 10 to 40°C
Options
Rack Mount
Line Power 200 to 240 vac, 50/60 Hz
High Voltage Supply 60 Watts

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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