Tektronix 1A1, Инструкция по эксплуатации, Страница: 19 / 137

effect on the signal available at the CH 1 SIGNAL OUT
connector in any mode of operation. That is, these con­
trols are not electrically located in the preamplifier cir­
cuitry since the Channel 1 signal is picked off for use as
a Channel 1 front-panel output at a point ahead of the
location of these controls.
11. By using Channel 1 as a 1 OX low-level voltage pre­
amplifier, the Channel 1 signal available at the CH 1 SIG­
NAL OUT connector can be AC coupled into any input
where a 10X preamplified signal is needed. Consider that
if a 50-ohm load impedance is used, the signal amplitude
is halved. The signal amplitude is correspondingly lower if
the load impedance is lower than 50 ohms. Examples of
other uses are: (a) X-Y displays by applying the X-axis sig­
nal to Channel 1 and the output from the CH 1 SIGNAL
OUT connector to the oscilloscope External Horizontal input
connector; use Channel 2 for the Y-axis signal; (b) the sig­
nal from the CH 1 SIGNAL OUT connector can be used to
drive recording equipment.
Operating Instructions— Type 1A1
Advantages of Using The Channel 1 Trigger
Out Amplifier
In addition to the previously given operating information
concerning the Type 1A1 CH 1 TRIGGER OUT connector
and the Internal “ Plug-In" triggering source, the following
information is provided for consideration:
Use As An Amplifier For Low Level
Triggering Signals
1. The amplitude of the signal from the Channel 1 Trig­
ger Out amplifier is not affected by the Channel 1 VARI­
ABLE (VOLTS/CM).
2. The DC level of the signal from the Channel 1 Trig­
ger Out amplifier is not affected by the Channel 1 POSI­
TION control. Thus when DC Triggering Coupling is used,
readjustment of the Triggering Level control is not necessary
(A )
10 20 50 100 l k 10 k 100 k 1 M
Frequency in Hz
Fig. 2-6. Constructing a low-pass filter. The curve in IB) shows the approximate upper 3-dB down point for a given capacitance value.
2-12