HP 8340B Manual page 47

4-8.
SPURIOUS SIGNALS TEST, 22 to 26.5 GHz (Applies only to HP 8340B)
(Cont'd)
Equipment
Local Oscillator
.......................................
HP 8340A/B
Opt.
001
20 dB Attenuator
........................................
HP
8493C Opt 020
High Pass Filter
(Made from the following adapters)1
APC 3.5 (f)
to Waveguide
.....................................
HP K281C
APC 3.5 (m)
to Waveguide
............................
HP K281C Option 012
Mixer
................................. .............
HP
P/N 0955-0307
Spectrum Analyzer
.............................................
HP
3585A
Adapters
SMA
(m) to
BNC (f)
...................................
HP P/N 1250-1200
Cable (Semi-Rigid
SMA
male to
SMA
male)
................
HP P/N 08340-20124
NOTE
It is
important that the mixer be connected directly
to
the LO's RF Output
connector. For best results in
this test, the
local oscillator
drive to the
mixer should be
s+4
dBm.
Procedure
1.
Connect equipment
as shown
in
Figure 4-8. Allow
at least
a one
hour warm up time.
On the LO,
press
[INSTR PRESET]
and
[PEAK]
(turns
PEAK
on).
2. Press the
DUT's [INSTR PRESET]
key. Press
[POWER LEVEL].
If
the
power
level in the
ENTRY
DISPLAY
is
not
0
dBm, enter
[0] [dBm].
Press the
[CW]
key and enter any
CW
frequency in
the
10
MHz to 26.5
GHz
range.
3. Determine all possible harmonic frequencies of the RF
signal that could fall within
the 22 to 26.5
GHz range. Press
[SHIFT] [M2] to display
from
left to right;
the band
number
(in POWER dBm
display) and the YO frequency. Determine
all
possible YO harmonic frequencies that could
fall
within the
22 to 26.5 GHz range.
4. Press the
LO [CW]
key and enter
a frequency
50 MHz
below the harmonic
frequency to be tested.
Press the
[POWER LEVEL]
key and, using the rotary knob, increase the power level
until
the
UNLEVELED indicator light
comes ON.
Slowly
decrease the power level until the
UNLEVELED
light just
goes OFF.
5.
Press
[SAVE] [1]
on the
DUT
to save the current instrument state. Press
[CW]
and enter the
harmonic frequency to be tested. Set the Spectrum Analyzer
to
view the 50 MHz IF signal with the
peak of the
signal
at the top graticule
line.
6.
Press [RECALL] [1] on the DUT
to recall the original instrument state. The
amplitude of the
harmonic displayed on the Spectrum Analyzer should be at or below the specified test.
7.
Repeat steps
4
through
6
for each harmonic frequency determined
in
step
3.
8.
Set
the
DUT
to
another CW frequency and repeat steps 3
through 7.
1 The
waveguide portions of these
adapters pass
high
frequencies and attenuate low frequencies
HP 8340B/41B
Performance Tests
4-43/4-44