HP 8340B Manual page 17

4-2. FREQUENCY RANGE AND CW MODE ACCURACY (Cont'd)
Pressing [SHIFT][Ml] 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.
Press [CW]
a.
[SHIFT][CF] [1] [0] [MHz]. Press [SHIFT][Ml]
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 [ENTRYDISPLAY].
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
of the counter at each step.
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 6900.000000 MHz. Check the counter indication at each step.
The counter should indicate the HP 8340B/41B frequency
counter.
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] [ Ml] to enter the diagnostic display mode. Press [CF] to display the
center frequency in the [ENTRYDISPLAY]. The center frequency should be 2.310S00 GHz.
HP 8340B/41B
key and enter [2] [4] [9]
NOTE
[01[MHz].Select a step size of 10 MHz by pressing
to display, from left to right, the M divide
NOTE
±
NOTE
1 Hz z the resolution
±
1 Hz
the resolution of the
±
Performance Tests 4-15