Signal Delay
Two standard UHF connectors are provided on
the rear of the instrument for insertion of an
external length of delay cable into the vertical-
input signal circuit Choice of the appropriate
length and type of cable is at the discretion of
the user; no delay cable is furnished with the
instrument A signal delay permits the sweep to
be triggered and under way before the signal is
applied to the vertical deflection plates
SWEEP CIRC IT
Type
Triggered, hard-tube bootstrap sweep circuit
with inverter to produce balanced deflection
Rates
An eleven-position switch selects rates of 02,
05, 1, 2, 5, 1, 2, 5, 10, 20 and 50 MICRO-
SECONDS/CM, with a maximum displacement
error of 2 percent over the center 8 cm of the
10-cm sweep length
Sweep Starting Time
The horizontal sweep starts approximately
100-m^sec after the signal or triggering pulse
arrives at the rear-panel connector An inserted
signal delay of approximately 150 m//,sec permits
the sweep to be triggered and under way before
the signal is applied to the vertical deflection
plates
Duty Cycle Limitation
A duty-cycle limiting control automatically
limits the duty cycle of the sweep circuit to about
10 percent to avoid exceeding the dissipation
limits of some of the circuit components The
limiting system serves purely a protective func
tion and does not provide a frequency dividing
operation
The following table shows the maximum per
missible repetition rate for each of the avail
able sweep times per centimeter
SWEEP TIME MAXIMUM
REPETITION RATE
50 jasec/cm 600 c/s
20 /xsec/cm 15 kc
10 jusec/cm 3 kc
5 use c/cm 6 kc
2 jasec/cm 10 kc
1 fxse c/cm 20 kc
5 jitsec/cm 50 kc
2 fxsec/cm 50 kc
1 fi sec/cm 50 kc
05 fisec/ cm 50 kc
02 fjisec/cm 50 kc
Triggering
A triggering phase-inverter amplifier in con
junction with a selector switch permits the sweep
circuit to be triggered from either positive- or
negative-going portions of the observed signal,
or from positive or negative triggers from an
external source A trigger voltage range of 100
volts to 3000 volts amplitude will be adequate
for stable triggering The MARKER position on
the selector switch must be used when time
markers are desired
Sweep Mode
A two-position switch provides for either re
petitive or single-sweep operation When the
switch is in the single-sweep position, pressing
the RESET button arms the sweep circuit The
sweep can then be triggered internally, by MAN
UAL TRIGGER, or by an external trigger The
1-2 GENERAL DESCRIPTION — TYPE 507
