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WARRANTY
Avtech Electrosystems Ltd. warrants products of its manufacture to be free
from defects in material and workmanship under conditions of normal use. If,
within one year after delivery to the original owner, and after prepaid return by
the original owner, this Avtech product is found to be defective, Avtech shall at
its option repair or replace said defective item. This warranty does not apply to
units which have been dissembled, modified or subjected to conditions
exceeding the applicable specifications or ratings. This warranty is the extent of
the obligation assumed by Avtech with respect to this product and no other
warranty or guarantee is either expressed or implied.
TECHNICAL SUPPORT
Phone: 613-226-5772 or 1-800-265-6681
Fax: 613-226-2802 or 1-800-561-1970
E-mail: info@avtechpulse.com
World Wide Web:
http://www.avtechpulse.com
2 TABLE OF CONTENTS
WARRANTY.................................................................................................................... 2
TECHNICAL SUPPORT.................................................................................................. 2
TABLE OF CONTENTS.................................................................................................. 3
INTRODUCTION............................................................................................................. 5
SPECIFICATIONS........................................................................................................... 6
EC DECLARATION OF CONFORMITY.......................................................................... 7
INSTALLATION............................................................................................................... 8
VISUAL CHECK........................................................................................................................8
POWER RATINGS....................................................................................................................8
CONNECTION TO THE POWER SUPPLY..............................................................................8
ENVIRONMENTAL CONDITIONS............................................................................................8
LABVIEW DRIVERS.................................................................................................................9
FUSES........................................................................................................................... 10
AC FUSE REPLACEMENT.....................................................................................................10
DC FUSE REPLACEMENT.....................................................................................................11
FUSE RATINGS......................................................................................................................11
FRONT PANEL CONTROLS........................................................................................ 12
REAR PANEL CONTROLS.......................................................................................... 14
GENERAL INFORMATION - PULSE GENERATOR TIMING.......................................16
BASIC PULSE CONTROL......................................................................................................16
TRIGGER MODES..................................................................................................................17
GATING MODES.....................................................................................................................17
GENERAL INFORMATION - OPERATING INTO A LOAD.......................................... 19
AMPLITUDE CONTROL.........................................................................................................19
SELECTING THE SERIES RESISTANCE..............................................................................19
TEST ARRANGEMENT...........................................................................................................19
USING THE LZ OUTPUT LINE...............................................................................................20
LENZS LAW AND INDUCTIVE VOLTAGE SPIKES.............................................................21
ATTACHING AND DETACHING LOADS................................................................................21
START-UP CHECK-LIST FOR LOCAL CONTROL...................................................... 22
MECHANICAL INFORMATION..................................................................................... 24
TOP COVER REMOVAL.........................................................................................................24
3 RACK MOUNTING..................................................................................................................24
ELECTROMAGNETIC INTERFERENCE................................................................................24
MAINTENANCE............................................................................................................ 25
REGULAR MAINTENANCE....................................................................................................25
CLEANING..............................................................................................................................25
PROGRAMMING YOUR PULSE GENERATOR........................................................... 26
KEY PROGRAMMING COMMANDS......................................................................................26
ALL PROGRAMMING COMMANDS......................................................................................27
PERFORMANCE CHECK SHEET................................................................................ 29
Manual Reference: T:\instructword\avoz\AVOZ-A1-B,edition1.sxw.
Last modified April 30, 2004.
Copyright © 2004 Avtech Electrosystems Ltd, All Rights Reserved.
4 INTRODUCTION
The Model AVOZ-A1-B pulse generator is designed for pulsing laser diode and other
low impedance loads with rectangular pulses as high as 20V into 1 (i.e. 20 Amps) with
10 ns rise and fall times. The current and voltage polarities depend on the model
number:
-P units: 0 to +20 V amplitude (0 to +20 Amps)
-N units: 0 to -20 V amplitude (0 to -20 Amps)
-PN units: 0 to ±20 V amplitude (0 to ±20 Amps)
The pulse repetition frequency can vary from 1 Hz to 20 kHz, and pulse widths can vary
from 20 ns to 1 us. The maximum duty cycle is 2%.
The Model AVOZ-A1-B pulse generator is a voltage pulser. The current amplitude is
determined by Ohms Law. That is, the current is the output voltage divided by the load
resistance. The load resistance should be approximately 1 to attain a peak current of
20 A.
The loads can be connected to the pulse generator using the convenient LZ1 flexible
flat transmission line, which has a 1 characteristic impedance (Z
0
), and is terminated
with a small circuit board.
The AVOZ-A1-B can be controlled from the front panel, or via a computer connected to
the IEEE 488.2-compliant GPIB port, or the RS-232 serial port.
This instrument is intended for use in research and development laboratories.
5 SPECIFICATIONS
Model
1
:
AVOZ-A1-B
Amplitude
2,3
:
current:
voltage:
0 to 20A
0 to 20V
Minimum load impedance
4
:
(required to limit current)
1
Pulse width (FWHM):
20 ns - 1 us
Rise time (20%-80%):
10 ns
Fall time (80%-20%):
10 ns
Maximum PRF:
20 kHz
Duty cycle: (max)
2 %
Output impedance:
0.2
Average output power:
10 Watts maximum
Droop:
5%, at maximum pulse width and maximum amplitude
Polarity
5
:
Positive or negative or dual polarity (specify)
GPIB & RS-232 control
1
:
Standard on -B units.
LabView drivers:
Check http://www.avtechpulse.com/labview for availability and downloads
Propagation delay:
100 ns (Ext trig in to pulse out)
Jitter:
100 ps (Ext trig in to pulse out)
Trigger required:
External trigger mode: + 5 Volts, 50 to 500 ns (TTL)
Sync delay:
(sync out to pulse out)
Variable
0 to ± 1 s
Sync output:
+ 3 Volt, 100 ns, will drive 50 Ohm loads
Gate input:
Synchronous or asynchronous, active high or low, switchable.
Suppresses triggering when active.
Output transmission line:
length:
characteristic impedance:
Flexible microstrip,
60 cm
1
Output connection:
Solder terminals (or optional socket
6
),
on the end of the flexible microstrip transmission line
Other connectors:
Trig, Gate, Sync: BNC
Power requirements:
100 - 240 Volts, 50 - 60 Hz
Dimensions: Mainframe:
100 mm x 430 mm x 375 mm (3.9 x 17 x 14.8)
Output Module:
N/A
Chassis material:
Anodized aluminum, with blue plastic trim
Mounting:
Any
Temperature range:
+5°C to +40°C
1) -B suffix indicates IEEE-488.2 GPIB and RS-232 control of pulse amplitude, pulse width, delay and PRF. (See page 8).
2) For remote analog electronic control (0 to + 10V) of the amplitude, suffix model number with -EA. Electronic control units also include standard front-
panel controls.
3) For operation at voltage amplitudes of less than 10% of full-scale, better results may be obtained by setting the amplitude near full-scale and
increasing the load impedance accordingly.
4) For applications where additional resistance must be added in series with the device
5) under test, Avtech recommends connecting multiple Ohmite OX or OY-series or RCD RSF2B resistors in parallel to create a high-power, low-
inductance effective resistance.
6) Indicate desired polarity by suffixing model number with -P or -N (i.e. positive or negative) or -PN for dual polarity option.
7) To specify diode socket mounting option, suffix model number with -S5 and describe the diode package type (e.g. TO-18) and the required pin
connections (eg. anode, cathode, ground, etc.). See page 75 for readi