Tektronix FG 5010 User Manual

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C
C
is tested for a
low ,
causing
Error 324 if
it is high .
Next , the
loop cycle
counter
is
clocked
again by
setting
U1340 pin 9
high . This
should clock the
loop cycle
counter
from
1 to ,
causing the
terminal
count gate
U1230 pin 6 to go
high , and
reset U1220A through gate U1222A . U1220 pin 13 is tested
for a high , and
Error 324 is
displayed
if it is
low .
U1220B
should
reset when
it
is
clocked , by
setting U1340 pin 9 low
.
U1220 pin 8 is
tested
for
a high ,
causing
Error
323
if it is
low
.
During the time that U1220B was set , the reference fre
quency counters ( U1320 and U1322 ) should count the
4
MHz
reference
clock
.
The
reference
count
is
read
through
shift
registers
U1330
and
U1332
and
tested for a
count of
453E
to
4544 Hex ;
Error 322 is
displayed if it is
incorrect .
Then
,
the
reference
frequency
counters are
reset
by
setting
U1212 pin 3 low .
U1212 pin 3 is
set high ,
and
U1220B is set
by toggling
U1340 pin 9. The MPU
waits 20 ms for
the refer
ence frequency counters to overflow ; the overflow bit
( U1322 pin 12 )
is tested for
a high , and
Error 323 is dis
played if it is
low .
This
completes the
frequency
control
logic
test on the Loop 2 board .
Errors
325
,
327
,
328
,
329
,
330
,
331
,
332.
The
Loop
1
board is
tested by
using
the
frequency
control
logic on
the
Loop 2
board .
The
reference
and loop
cycle
counters
are
used
as
a
frequency
counter .
Loop
1 is
set for the
continu
ous
mode on
the 2
MHz
frequency
range .
The
frequency
DAC
(
digital
to
analog
converter ,
U1612 ) is
set to a
maxi
mum
count of
4095.
The
frequency
generated by
Loop
1
is
measured by
Loop
2
and
tested to see
if it is
between
1.6
MHz
and
4.0
MHz
.
Error
327 is
displayed if
this
test
fails
.
The frequency
prescaler (
U1232 ,
Loop 2 ) is
set to di
vide
by
10 , and
the
frequency is
measured
again
. If
the
prescaled output is not
between
160 kHz and
320 kHz Error
325
is
displayed .
Each
frequency range is
tested for a
top
end
frequency
between 2
and
4 ;
i.e. ,
the
2
kHz
range is
tested
for a
frequency
between
2
kHz and 4
kHz . Each
of
these
frequency
range
tests
is
performed at
10 , 50 ,
and 90
REV
JAN
1982
Maintenance - FG 5010
percent symmetry settings . Errors 328 , 329 , 330 , 331 , and
332 correspond to ranges 2 kHz , 20 kHz , 200 kHz , 2 MHz ,
and 20 MHz .
Error 326. With
the Loop 1
board set for 20
MHz , the low
frequency generator is tested by measuring the frequency of
the low
frequency square signal
( U1210 pin 13 ,
Loop 2 ) . The
loop cycle counter is set for a count of one cycle . The clock
multiplexer for the loop cycle counter ( U1222B , Loop 2 ) is
set to
select
the
LFSQ
signal
. The
frequency is
measured
and Error
326 is
displayed if it is not
between
200
Hz and
400 Hz .
Error 333. The
next test
performed is on
the
burst
counter on the
Sine
Shaper
board
.
For this
test , the
Loop
1
board
is
set to 2
MHz and
placed
in
the burst
mode
. The
loop cycle
counter
counts
the exact
number
of
cycles
in the
burst
. The
loop
cycle
counter (
U1130
,
U1132
,
U1110
, and
U1120 , Loop
2 ) is preset to
a count of
9999 cycles .
Then
the
burst
count is
set for
9999
cycles .
The
frequency
prescaler
( U1232
, Loop 2 ) is set
to divide by 1 ,
and the duty
cycle
control
bit
(
U1340 pin 9 ,
Loop
2 )
is set
high . The
loop
cycle
counter is
enabled to
count by
setting
U1212 pin
3 ,
Loop 2 high .
The MPU
triggers
the
burst using the
manual
!
trigger
signal
.
When the
burst is
completed the
HFSQ
signal
from
Loop
1 (
U1232
pin
14 ,
Loop
2 )
should
be
high .
The
loop
cycle counter
counted
down
from 9999 to ,
causing
the
terminal
count
signal (
U1230 pin
6 ,
Loop
2 )
to go
high
.
The
next high to
low
transition of
HFSQ
clocks
U1220B
,
Loop 2 ,
indicating
measurement
completed
.
U1220
pin 8 ,
Loop 2 is
tested
for a
low ,
causing Error
333 if it is
high . This
indicates
that
the
burst
was
longer
than
9999
cycles
.
Then
,
the duty
cycle
control bit (
U1340
pin 9 ,
Loop 2 ) is
set low ,
causing U1220B
to clock from
the set to the
reset state . If
the
burst
was
shorter
than
9999 cycles , the
terminal
count
signal ( U1230
pin 6 ) will not
be high , and
U1220B
will
not
reset
.
U1220 pin 8
,
Loop 2 is
tested for a
high
,
causing
Error
333
if it
is low
.
This
test fails if the
manual
trigger
function
does
not
work
.
7-13

Tektronix FG 5010 Specifications

General

Brand	Tektronix
Model	FG 5010
Category	Portable Generator
Language	English