INTRODUCTION
The
PT003 Trigger Generator is an ideal source to fire the larger PT55 series
pulsers*. It is capable of driving loads
of virtual short (0 impedance) to open circuit (500 volts into 10k Ohms). This unique feature renders the PT003 open to
many applications, such as firing of: Solid State Laser, Xenon flash tube, LED,
Squib, Hard and soft vacuum tubes, Microwave tubes and Krytrons. In the last category, the PT003 has operated
into 7.5kV. anode potential through 180 Ohms isolation
repeatedly, without ill effects.
OPERATION
GUIDELINES
Electrical Connections The
input, output and D.C. charge connections are clearly marked on the name-
plate. All leads are coaxial and of
RG-174 type, and will accept standard RF type connectors.
Mounting PT003 may be mounted in any
convenient position, requiring only a single 6-32 UNC screw. The mounting point is floating (all pulse and
D.C. returns are through individual coaxial shields).
D.C. Bias A
90 volt battery is an excellent supply, or any regulated 100 volt linear power
supply may be substituted. Observe
proper polarity: do not apply over +100
volts D.C. bias.
Current requirement is typically 0.5 mA. @ 60
pps. Idle drain is less than 25 uA. @ ambient. The PT003
will operate down to +10 volt D.C. charge.
Trigger Input Trigger
input impedance is 50 Ohms. The PT003
will trigger on a 3 volt 25 nS. Wide pulse. Fast rise pulses are desirable. Repetition rate is excess of 100 Hz.
Output Output is
designed to operate into 50 Ohms, but the PT003 will pulse into loads ranging
from short to open circuit. Output
amplitude is a function of D.C. charge: over +300 volts peak when charged to
+100 volts D.C., and short circuit recovery is
automatic. Output risetime is less than
10 nS. into 50 Ohms (typically 7.5 nS.)
Pulse Jitter Input-Output
delay is nominally 25 nS., jitter is less than 1
nS. When triggered by a mercury reed
switch at 5 volts 60 pps., jitter was immeasurable @ 2 nS. O’scope sweep. Where jitter is critical, operate the PT003 at the maximum D.C.
charge, i.e. +100 volts.
* A
system consisting of a PT003 and PT55, will trigger on 3 volts and output more
than 50 kV., with less than 5 nS. Jitter.