HP 3336A - Page 136

Adjustments of
Model 3336A/B/C
; ; 2
Required Equipment: iv ©
dc Voltmeter -hp- Model 3466A
a. Measure the dc voltage at the — 15V test point on the A2 Power Supply printed circuit
board.
b. Adjust A2R22 until the voltage is —15V, +0.03V.
c. Measure the dc voltage at the +5V and + 15V test points. These voltages should be
+5V, +0.05V and +0.03V, respectively.
d. If necessary, readjust A2R22 until all three voltages are within tolerance.
5-7. 30 MHz Reference Oscillator Frequency Adjustment.
5-8. This procedure sets the frequency accuracy of the 30 MHz Reference Oscillator to
within 5 parts per million.
Required Equipment:
Electronic Counter -hp- Model 5328A
with Option 010
75 ohm Feedthru Termination -hp- Model 11094B
NOTE
@
The
-hp-
3336
must
be
ON
for
at
least
30
minutes
before
making
this
adjustment.
a.
If
the
-hp-
3336
is
equipped
with
Option
004,
disconnect
the
special
BNC
to
BNC
adapter
from
the
10
MHz Oven Output
and
the
Ext
Ref Input.
b.
Connect
the
3336’s
75
ohm
output
to
the
electronic
counter
using
the
75
ohm
Feedthru
Termination
at
the
electronic
counter’s
Hi
Z
input.
c.
Set
the
3336
output
amplitude
to
+
7.00
dBm
(maximum)
and
frequency
to
20
MHz.
d.
Adjust
A3R30
until
the
counter
reads
20
MHz
as
accurately
as
possible.
The
specifica-
tion
is
20
MHz,
+100
Hz.
e. If necessary, reconnect the special adapter removed in Step a.
5-9. Option 004, High Stability Reference Frequency Accuracy.
5-10. This procedure sets the frequency accuracy of the High Stability Frequency
Reference, Option 004, to within 1 part in 10 million.
Required Equipment:
Electronic Counter -hp- Model 5328A &
with Option 010
75 ohm Feedthru Termination -hp- Model 11094B