HP 8340B Manual page 20

4-2.
FREQUENCY RANGE AND CW MODE ACCURACY (Cont'd)
NOTE
Pressing [SHIFT] [M1] displays, from left to
right, the:
M
divide number,
N
divide number,
M/N
Loop output frequency,
20/30
Loop output frequency.
Press [SHIFT]
[M5]
to exit this diagnostic mode.
The instrument
con¬
tinues to operate normally while in the diagnostic mode.
a.
Press
[CW]
key and enter
[2] [4] [9] [0] [MHz]. Select
a
step size of
10
MHz by pressing
[SHIFT] [CF] [1] [0] [MHz],
Press
[SHIFT] [M1] to
display, from left to right, the
M
divide
number, the
N
divide number, the
M/N
Loop output frequency,
and the
20/30
Loop output
frequency. Press
the
[CW] key to display the
CW
frequency
in the
[ENTRY DISPLAY].
b.
Using the
down arrow
key, step down to
2
300.000000 MHz. Check the counter indication at
each step.
The
counter should indicate the HP 8340B/41
B
frequency ±
1
Hz
±
the resolution
of the counter
at each
step.
NOTE
The above
step sets
and holds the
N
Divider
to 13
and programs the
M
Divider through its full range of
8
to 27. Any
frequency error as a
result of
a
problem in the
M Divider will probably be
a
multiple of
10
MHz.
c.
If
a
significant frequency error
is evident, note the conditions under which the error occurred
and continue this
procedure to determine
if
any other conditions produce an error.
5.
Check the
M/N N
Divider frequencies as follows:
a.
Select
a
step size of 200
MHz by pressing
[SHIFT] [CF] [2] [0] [0] [MHz].
Press
[CW]
to
display the CW frequency
in the
[ENTRY DISPLAY]. The CW frequency should be 2
300.000000 MHz.
b.
Using the up
arrow key, step to
6
900.000000 MHz. Check the counter indication at each step.
The counter
should indicate the HP 8340B/41 B
frequency ±
1
Hz ±
the resolution of the
counter.
NOTE
The above step sets and
holds the
M
Divider to 27 and programs the
N
Divider through its full
range
of
13
to 36. Any frequency error as
a
result
of
a
problem
in the
M
Divider will probably be
a
multiple of
10
MHz.
c.
If
a
significant frequency error
is
evident, note the conditions under which the error occurred
and continue this
procedure to determine
if
any other conditions produce an error.
6.
Check the
20/30 MHz N2 loop frequencies as follows:
a.
Press [INSTR
PRESET]. Press[CF]
key and enter
[2] [3] [1] [0] [.] [5] [MHz].
Press the
[AF]
key and enter [1]
[MHz]. Select
a
step size of
1 kHz by pressing
[SHIFT] [CF] [1] [kHz].
b.
Press
[SINGLE] sweep key
to set the
DUT
to be phase-locked at the start of sweep (2.310
GHz]. Press
[SHIFT] [M1]
to enter the diagnostic display mode. Press
[CF]
to display the
center frequency
in
the
[ENTRY DISPLAY]. The center
frequency should be 2.310500 GHz.
HP 8340B/41B
Performance Tests
4.15