General Operating Information - Tektronix 284 Instruction Manual

Fig. 2-4. Typical SINE WAVE OUTPUT display showing (A) 10 ns
and (B) 1ns time period.
GENERAL OPERATING INFORMATION
Mode Switch
The MODE switch selects one output with its trigger signal.
The MODE switch always turns the power off on one output
which prevents both trigger signals from appearing at the
TRIGGER OUTPUT at the same time.
Square Wave Output
Tne SQUARE WAVE OUTPUT amplitude is selected by
the SQUARE WAVE AMPLITUDE switch, and the time period
is selected by the PERIOD switch on three of its positions.
Note that the other two positions of the PERIOD switch
select the SINE WAVE time period. In order to maintain the
output selected by the SQUARE WAVE AMPLITUDE switch,
an output load of 509 is required. For further loads use
the following formula to calculate the output voltage:
Rioad
ut Rioad
+ 50 x
(
Operating Instructions—Type 284
Pare
a a
Fig. 2-5. Typical PULSE OUTPUT display, showing a double ex-
posure of two positions of LEAD TIME switch.
(E is the Voltage selected by the SQUARE WAVE AMPLI-
TUDE switch)
Fig. 2-7 shows the time period and amplitude measurement
points. In this display the output of the Type 284 is properly
terminated by being coupled to the 50Q input of a sam-
pling oscilloscope. Disregard the overshoot at the top
corner of the square wave in making amplitude measure-
ments. The time period measurement (here a period of
100 ns) is the time of one cycle of the square wave.
The square wave output desired can be selected for am-
plitude from 1V, 100mV or 10 mV and for the time period
from 10 ps, 1 us or 100 ns.
Sine Wave Output
The SINE WAVE OUTPUT is selected by the PERIOD
switch. The period switch selects either a 10ns or a Ins
sine wave time period. The time period is the time of one
cycle of the sine wave. The amplitude is approximately
100 mV when it is connected into a 50Q load.
2-5