Table of Contents
Advertisement
Model 5344S
Operation and Programming
8. Using the 5344A Numeric Entry keys press;
0
The 5344A should display:
10.000000 MHz
9. Press the MANUAL LOCK key.
The LOCKED annunciator should light.
10.
If the FREQ LO annunciator lights, manually raise the frequency of the 8350A until the 5344A locks.
11.
If the FREQ HI annunciator lights, manually lower the frequency of the 8350A until the 5344A locks.
12.
Notice that the counter is now displaying the actual output frequency of the plug-in although it's
counting the rear panel AUXOUT. The counter display is offset by the Cavity Oscillator value so the
true output and the counter's display are the same. When the 5344S is not locked, or either
MANUAL LOCK or AUTO LOCK are off, the counter will always display the true frequency it is
counting. When Lock is achieved, the counter display will be offset so it displays the actual front
panel output frequency.
13.
Above 2.4 GHz, the 83592A plug-in does not use the Cavity Oscillator, so frequency Offset Locking is
limited to the range where the output of the plug-in is generated by mixing it with a fixed frequency
oscillator.
14.
If AUTO LOCK was being used, the 8350A would have been automatically programmed to 10 MHz.
NOTE
When performing Frequency Offset Locking procedures, if you know the
true frequency of the Cavity Oscillator in the plug-in, enter that value. In
this procedure, you entered 3.8 GHz as the offset. If the Cavity Oscillator is
really at 3.7995xxxx GHz and this value is entered, the true output of the
plug-in when Locked will be closer to the selected value. To determine the
true frequency of the Cavity Oscillator, apply the locked signal to the input
of another counter. If the sweeper is locked at 10 MHz the second counter
probably isn't displaying exactly 10 MHz. This error is the amount the
Cavity Oscillator is off from the value entered into the 5344S system's
counter. As an offset into the second counter, enter the frequency to
which the sweeper is locked. In this example, you would enter an offset of
-10 MHz. Now the second counter is displaying the amount the Cavity
Oscillator is off frequency. If the result is positive, lower the offset
frequency by that amount. If the result is negative, increase the offset by
that amount.
On the second counter, note the least significant digit that is stable. For
example, the 1 KHz position is stable, but the 100 Hz position and below
are not. When entering the true offset in the 5344S system's counter, limit
the offset to the LSD that is stable.
Figure 3-18. Frequency Offset Locking (Continued)
/•—"\
MHz
ms
\
_
/
3-55
Advertisement
Table of Contents
