Tektronix 492 Operator's Handbook

c . With the Vertical Display mode at 10 dB / DIV , set the
top of the calibrator signal to the top graticule line with the
LOG CAL adjustment so the signal level indicates
-20
dBm .
d . Check the display log scale over 50 dB of dynamic
range by
switching
REF
LEVEL in
10 dB
steps from
-20 dBm to +30 dBm and noting that the display
amplitude decreases 10 dB or one division per step .
e
. Set the REF
LEVEL at
-20 dBm and
the
Vertical
Display
to
2
dB / DIV
.
f . With the REF LEVEL selection in coarse mode ,
change the REF
LEVEL to -10
dBm in 1
dB steps . Check
that
the
amplitude
and REF
LEVEL
readout
reduces
1
dB /
step for
a
total of 10
dB ± 1.3
dB .
g
. Return
the REF
LEVEL to -20
dBm and
activate
FINE for the AA mode .
h
. Change
the REF
LEVEL
2.00 dB .
Check that
the
REF LEVEL readout changes in 0.25 dB steps and the
display
amplitude
decreases
2 dB
± 0.5 dB
( 1
division
+0.25
division ) to
match the 2 dB
change in
readout .
Return
the REF
LEVEL to 0.00
dB .
i
. Change the
display mode
to 10 dB
/ DIV ,
switch the
REF LEVEL from -20 dBm to -10 dBm . Check that the
REF LEVEL changes in 1 dB increments and the total
change in
display
amplitude
is 10 dB
± 1.3 dB
( 1 division
+0.13 division ) .
j . Return the REF LEVEL to - 20 dBm and cancel FINE
for
coarse
steps .
CHECK
SPAN
ACCURACY
AND
LINEARITY
Span
accuracy is
the
displacement
error of calibrator
markers from the center reference over +4 divisions of
span
.
Linearity is the
displacement
error
of
markers from
their
specified
points over the
display area
, with the
1st
graticule
line
as the
reference
.
492
Operator's
Handbook
2-17

Tektronix 492 Specifications

General

Brand	Tektronix
Model	492
Category	Measuring Instruments
Language	English