Tektronix FG 5010 User Manual

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Control of the various functions in the FG 5010 is
through a set of shift registers of varying word lengths . One
register exists for each board ; i.e. , Loop 1 , Loop 2 , Sine
Shaper , and Output Amplifier . Thus , if a function requires
alteration on the Sine Shaper and none is required on the
other circuits , CPU time is saved .
Operation of the other circuitry of the FG 5010 is as fol
lows . The trigger signal is applied through the TRIG / GATE
INPUT front - panel connector to the Trig - Gate Slope - Level
Selection circuits , which determine the slope and level of the
trigger that is to control the start of the loop . The signal is
then applied to the Mode Logic circuits , which permit CPU
control of the slope of the trigger , and the start and stopping
point of the High - frequency Loop signals for gate , triggered ,
and
burst
operations .
The High - Frequency Loop , also called Loop 1 and the
Main Loop , forms the core of the function generator . It pro
duces
the
fundamental high -
frequency triangle and
square
wave signals that are used by the Sine Shaper and Loop 2
circuits for producing the other signals . From the Loop 1
circuits , the HFSQ signal is applied to the Lo Freq Gen ,
which forms the low - frequency triangle and square wave
signals . The HFSQ signal is also applied to the Freq Control
circuit
, which
compares the
HFSQ signal
with the 4 MHz
reference frequency from the CPU , and notifies the CPU of
any error so correction can be made as required . The LF
TRI and LFSQ signals are applied to the Hi Freq Loop cir
cuit , which
selects
whichever of the
triangle
or
square
waves , high - frequency or low - frequency , that is to be routed
to the Function Switching circuit as the SEL TRI signal , or
through the Sq Buffer as the SEL SQ signal , also to be
applied to the Function Switching circuit . The Hi Freq Loop
circuit also receives the voltage from the Clamp circuit that
holds the
generator
from
running during
triggered
, gated ,
or
burst modes of operation , and the FM - VCF voltage from the
front panel to control the loop frequency by external means .
Theory of Operation - FG 5010
A voltage is also applied to the Hi Freq Loop from the
Lock Cktry circuit that modifies the operating frequency of
the loop to lock the loop on to an incoming trigger . Both the
Clamp and the Lock are controlled by the Phase Voltage
Gen , which produces a CPU - controlled voltage that deter
mines the point on the triangle at which the loop begins , and
the phase difference between the loop signal and the ap
plied trigger during phase - lock operations .
The Lo Freq Gen receives the HFSQ signal from the Hi
Freq Loop , divides it by 100,000 , and applies it back to the
Hi Freq Loop as a precise low - frequency triangle . The circuit
also produces the LFSQ signal , which is the HFSQ signal
that is divided by 100,000 ; this signal is returned to the Hi
Freq
Loop for
application to
the Sq Buffer
.
The Sine Shaper receives a triangle - wave signal from the
Function Switching circuit , shapes the signal into a sine
wave , and returns it to the same circuit . The Sq Buffer out
put signal is applied to the Function Switching circuit , and to
the Trigger Interfaces Circuit . This circuit produces the trig
ger that is furnished to the TRIG OUTPUT connector on the
FG 5010
front panel .
The
circuit
also
furnishes
the
square
wave signal that is applied to the N Burst Counter , which
under CPU control determines the number of cycles of sig
nal the FG 5010
will
generate
in
a burst .
The
sine , square
, or triangle - wave
output from the
Func
tion
Switching circuit
is applied
to the Level Control
& AM
circuits , which set the output amplitude of the signal , and
through the AM INPUT connector , introduces amplitude
modulation to the output signal . The signal , modulated or
not , is applied to the Amplifier , which amplifies the signal for
application to the Atten . This circuit applies attenuation to
the signal in 10 dB steps , up to 50 dB . The attenuated out
put is combined with the offset voltage from the Offset Gen ,
and applied to the OUTPUT connector .
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Tektronix FG 5010 Specifications

General

Brand	Tektronix
Model	FG 5010
Category	Portable Generator
Language	English