Characteristics; Charge Line - Tektronix TYPE 109 Instruction Manual

General Information
The Tektronix Type 109 Pulse Generator is a fast-risetime
pulse generator similar to the pulse generator section of the
Type 110. The Type 109 is capable of producing pulses of
different widths, calibrated-amplitudes, and polarities for
use in driving and testing the response of devices operating
in the nanosecond region.
An external network, supplied with the Type 109, provides
long duration pulses with an amplitude decay of only 10%
in 400 nanoseconds. This network is useful for testing ampli­
fier linearity or tuning delay lines.
Pulse Amplitude
Three calibrated ranges: 0 to 0.5 v, 0 to 5 v, 0 to 50 v.
Accuracy is within 3% of the front-panel full-scale mark­
ing. Each range is continuously variable.
± 5 0 volts is the maximum calibrated amplitude using the
internal power supply; ± 3 0 0 volts maximum allowed
using an external supply and either or both contacts.
Polarity
Positive or negative.
Risetime
Less than 0.25 nsec (nanosecond or 10"9 second). Pulse
risetime is illustrated in Figs. 1-1 and 1-2.
R IS E T IM E LESS T H A N 0 .2 5 nsec
F ig . 1 -1 . A d o u b le e xp o su re p h o to g rap h o f the output p u lse from
the T yp e 1 0 9 (n o e x te rn a l ch a rg e
tim ing t ra in . The w a ve fo rm s a re d is p la y e d on a T e k tro n ix 0 .1 2 -n s e c
risetim e re se a rch -ty p e o sc illo sco p e .
risetim e to be w e ll u n d e r 0 .2 5 n sec.
a p p ro x im a te ly 0 5 nsec. N ote the freedo m from ove rsh o o t.
®
1 nsec
lin e ) a n d a 1 g ig a c y c le / s e c
T h is p h o to g rap h sh ow s
The m inim um p ulse w id th is

CHARACTERISTICS

Vertical Deflection Factor: 200 mv/cm
Equivalent Sweep Rate: 0.2 nsec/cm

Charge Line:

cable connected between
1 and 50 ß CHG. LINE 2 connectors.
F ig . 1 -2 . W a v e fo rm sh o w in g the T yp e
T e k tro n ix T yp e 661 (S a m p lin g )
of the system , b etw ee n
th an 0 .4 n an o se co n d s.
Duration
From approximately 0.5 nsec measured at the 50% ampli­
tude level (see Figs. 1-1 and 1-3), to a maximum of 100
nsec at a repetition rate between 550 to 720 cycles using
a single charge line to both contacts; 300 nsec at half
repetition rate by using either one open-ended charge
line with the unused contact grounded or by using two
separate open-ended charge lines.
An accessory, a special external charge network sup­
plied with the Type 109, provides a fast-rise pulse with an
RC decay (see Fig. 1-4) and a pulse amplitude which is
about one-tenth that indicated by the front-panel mark­
ing. Decay is only 10% in 400 nsec (see Fig. 1-5). Fig.
the
1-6 shows the pulse waveform at an equivalent sweep
rate of 1 nsec/cm.
SECTION 1
One 10-nsec 50-ohm RG-8A/U
5012 CHG. LINE
1 0 9 p ulse d is p la y e d
O sc illo sc o p e . Com b ined
1 0 % an d 9 0 % am p litu d e le v e ls , is less
on a
risetim e
1-1