HP 3585A Service Manual page 50

O peration O verview
Marker/Manual Measurement Functions
COUNTER NO I SE l V L
Measure a bsolute freq uency and a m p l itude of on­
screen responses with
( T h e M a r k e r
displayed i n d B m
rms volts.
resolution and accuracy is l i m ited by
the poi nt- by- point display and sweep
dynamics . )
COUNTER
0
Use t h e fu nction to precisely measure the
freq uency of the signal that is p rod ucing the
response on which the M a rker is positioned .
( T h e C o u nter, u n affected by display
r e s o l u t i o n a n d
displays the t r u e frequency at the
peak of the response.
does not need to be at the peak of the
response, but it must be at least
a bove the noise a n d
u n resolved sig n a L )
NO I SE L.VL
0
The fu nction
1
rea d i n g of the rms random noise spectral density
at the M a rker or M a n u a l frequency, normal ized to
a H z noise power bandwidt h . A l l correction fac­
t o r s a re i n c l u d e d
measu rement rout i n e .
( 1
( A bsolute n o i s e
d isplayed i n
( 1
Hz) " or "V H z " . Relative ( Offset)
noise rea d i n g s are displayed i n " d B
Hz) " . Noise measurement times
range from
seconds, depending on the Resolution
Bandwidth setting . )
3- 1 8
OFfSET
0
Marker
( 500 5m ,
a m p l i t u d e c a n b e
7
or dBV or
The M a rker' s frequency
Counter
s w e e p d y n a m i c s ,
20
The M a rker
20
d B
d B a bove a n y
Noise Level
provides a d i rect real-time
in t h e i n t e r n a l n o i s e ­
( 1
l e v e l rea dings a r e
" d Bm Hz) " , " d BV
0 . 3 33
seconds to
dBm
dB/O I V dBm
MARKER 5 4 1 3 050. 0
R E F . 0
1 0 RANGE
. 0
- - -- - t----·----�----l----
- - -
- -+
3
VBW
Hz
S T A R T 50 000. 0
R B W 1 0 KHz KHz
R E F . 0 dBm C O U N T E R
1 0 d B / D I V R A N G E . 0 d B m
r
- - - - - - - -
Hz .
KHz VBW KHz
CENT ER 20 000 OOO. p
RBW 30 3
dBm MARKER
dB/D I V dBm
REF . 0
10 RANGE . 0
- -
- - - - - - - - -
Hz
KHz VBW Hz
CENTER 1 1 25 833. 7
RBW 1 1 0
Model 3585A
Hz
dBm
-52. 2
- - -
�
- - - - -
I
- - - - - - -
STOP 1
0 0 0 0 0 0 0 . 0 H z
ST 1 . 0 SEC
H z
1 1 1 2 3 4 5 6 . 7
- 2 4 . 0 d B m
Hz
ST
SPAN 40 000 000. 0
1 . 4 SEC
Hz
dBm ( l Hz)
1 1 50 833. 7
- 1 07
- - -
- - -
-
-
-
SPAN H z
ST SEC
200 000. 0
62. 6