HP 8340B Manual page 58

4-11.
PULSE MODULATION ON
/
OFF RATIO
TEST (Cont'd)
Equipment
Spectrum Analyzer
.............................................
HP 8566B
50 Ohm Termination
...........................................
HP 10100C
Adapters
TYPE
N
(m) to APC 3.5 (f)
...............................
HP P/N 1250-1744
(2 required
if DUT
is
HP 8341 B)
(1 required
if DUT
is
HP 8340B)
APC 3.5 (0 to APC 3.5 (f)
................................
HP P/N
5061-5311
(1 required if DUT
is
HP 8340B)
Cable
SMA
(m) to SMA (m)
..............................
HP P/N 08340-20124
Procedure
1.
Connect equipment as shown
in
Figure 4-11. Allow
a
one hour warm up time.
2.
On the
DUT, press [INSTR PRESET] then [CW] [1] [GHz]. The RF power
level should be
0
dBm.
3.
Set the spectrum analyzer CENTER FREQUENCY
to equal the
DUT's CW frequency,
FRE¬
QUENCY SPAN 200 Hz, RES BW 30 Hz, PEAK SEARCH, MKR
—
CF,
MKR
—
REF LVL, MKRA.
4.
Press
the
DUT's [PULSE] key (ON). The spectrum analyzer marker
delta amplitude level should
be
greater
than
80
dB.
5.
Repeat steps
2
through
4
at
CW frequencies
of
3,
9,15, and.
if
the
DUT
is
an
HP 8340B, 22 GHz.
NOTE
For further verification of the
ON/OFF
Ratio,
steps
2
through
4
may be
repeated for other frequencies of interest.
4-56 Performance Tests
HP 8340B/41B