HP 3336A - Page 141

Model 3336A/B/C Adjustments
2
g.
Monitor
A3
TP4
with
the
oscilloscope
and
a
10:1
scope
probe.
;
h.
Press
AM
ON
(press
blue
button,
then
STORE
0-9
button).
i. Adjust A3R69 for minimum modulation.
j.
Disconnect
the
+
5Vdc
source
from
the
3336
AMPTD
MOD
input.
k.
Disconnect
the
3312A
from
A3J23
and
connect
it
to
the
AMPTP
MOD
input
on
the
3336.
I.
Connect
the
50
ohm
feedthru
termination
to
A3J23.
m. Adjust A3R33 for minimum modulation and adjust A3R68 for 0Vdc.
n.
Disconnect
the
3312A
and
the
50
ohm
termination
from
the
3336
and
reconnect
cable
W23
5-19. 2:1 Mixer Spur Adjustment.
5-20.
This
procedure
minimizes
the
2:1
intermodulation
products
of
the
mixer.
The
2:1
spur
is
a product
of
the
second harmonic
of
the
VCO
and
the
reference
fundamental.
Required Equipment:
impedance matching pad -hp- Model 85428B
spectrum analyzer -hp- Model 141T/8553B/8552B
@ a. Set the 3336 as follows:
Frequency ............ Perehdeeieas 10 MHz
Amplitude :s2.05.64.4vese040cseatecwees —2.99 dBm
Out PUP ia ene koe caw Sere 75 ohm
b. Set the 141T/3583B/8582B as follows:
Ranges. bccn sects towaiuewed 0 - 11 MHz
Center frequency ................... 10 MHz
Scan time ....... 2. cece ccs c cee seeens 1 msec/div
Bandwidth ................ 000 ee eee 30 kHz
Scan width.............. 0.000 ceca 0.05 MHz
Input attenuation ................... 0 dB
Log ref level .................0 00 eee -—10dB_ 10 dB/div
Video filter: <3su ae oad ee ae Saks 10 kHz
c. Connect the impedance matching pad between the 75 ohm output on the 3336 and the
spectrum analyzer’s input.
d. Adjust the center frequency of the spectrum analyzer to center the signal and adjust
the log ref vernier to achieve a 0 dB signal.
,
ae