Tektronix FG 5010 User Manual

Theory
of Operation
-
FG
5010
FREEGATE
( DATA )
1BA
>>
4-20
FROM
LOOP2
TRIG / GATE
TRIG
/ GATE
END OF BURST
FROM SINE SH .
SEL
SQ
BURST
(
DATA
)
U1211A
STOP
LP
( DATA )
크카
BURST
HI RANGE
(
DATA )
BU
BEGIN
RAMP
DOWN
HF
SQ
PW 5nS
EOB
STOP
LOOP
U1211B
HIGH
RANGE
blocked from passing through U1211A , but go directly
through U1211B . When the signal is low , U1211A can pass
triggering signals to the pulse - forming network at the output
of the gate . Likewise , the BURST signal at the base of
Q1201 comes from the latch , and controls the reset input of
U1201A ( pin 4 ) to enable burst operation when low , and
disable it when high . The STOP LP line from U1301 is ap
plied
to the set
input of
U1201B through
CR1401 . This line
is used by the CPU to control the loop state when switching
modes .
The TRIG / GATE signal is applied to U1211A and
U1211B , which with R1213H , R1212 , and C1111 , make up
a
pulse -
forming network
. Assuming that
U1211A
pin 4 is
low and pin 5 is high , the output is low for both U1211A and
U1211B . When the TRIG / GATE signal moves negative , the
output of U1211B , pin 14 , rises immediately . The output of
U1211A , pin 3 , begins to rise , but is delayed by the network
at the input of U1211B , pin 13. Approximately 5 ns later , pin
13 rises sufficiently to pull the output low , resulting in a 5 ns
pulse . One of these pulses occurs with each applied nega
tive transition . The pulse is applied to the set input of
U1201A , and the reset input of U1201B .
TRIG / BURST
MODES
ONLY
F
S
CK
R
$
D
▶
CK
Q
TRAMP
UP
Q
R
Q
U1201A
3
U1201B
Fig . 4-11 . Simplified diagram of Trig / Gate / Burst Logic .
14
ANY HI ON U1211C
INPUT RUN
U1211C
DIFF
DRIVE
TO Q1224
AND Q1223
LO
HI
RUN
CMP
3467-18
The logic circuits operate in three modes : Burst , Trigger ,
and Gate . The following discussion treats the circuitry as it
operates
in
each
mode
.
Triggered Mode . At the beginning of this sequence , pin
11 is pulled low to allow the other two inputs to control the
gate
. The
FREEGATE
signal is
low , which
allows
the
TRIG / GATE signal to produce a 5 ns trigger pulse . During
this time , the BURST signal is high , since the burst mode is
not selected . This holds U1201A reset , which in turn holds
pin 10 high . The trigger pulse goes to the set input , pin 5 of
U1201A , and the reset input of U1201B . The pulse has no
effect on U1201A , since the burst signal is still high at the
reset input . However , U1201B resets , placing a high level at
output pin 14.
This
enables U1211C pin
9 , and turns
on the
loop
.
U1201B pin 14
goes low
when
SELSQWV
moves
high at the Level Detector trip point of the triangle , thus
giving control of U1211C to the HFSQ signal at pin 10. Now ,
at the next negative transition of the squarewave signal at
pin 10 , the output of U1211C will switch , causing the Clamp
Enable Switch to change state , and will stop operation of
the
main
loop .
(
8
)
C
U
U
U
U
U
U
U
U

Tektronix FG 5010 Specifications

General

Brand	Tektronix
Model	FG 5010
Category	Portable Generator
Language	English