Internal Reference
Oscillators
Adjustment of the different timebase oscillators is described
under Calibration earlier in this chapter.
RF Input 3 GHz
Note: The 8 GHz prescaler can not be adjusted.
n
Setup
–
Do as described under Preparations above.
–
Select default settings by keying in
USER OPT ®
Save/Recall ® Recall Setup ® Default
–
Select measurement function FREQUENCY C.
–
Set the signal generator to 1000 ± 25 MHz with ampli
-
tude 5.9 ± 0.5 mV
rms
(-31.5 ± 0.5 dBm)
n
Adjustment
–
Connect the signal to Input C on the timer/counter.
NOTE: Before beginning any adjustments, the RF input
must have been in operation for at least a few minutes
to let it reach normal operating temperature.
– Turn the potentiometer on the prescaler board fully
counterclockwise. See Figure 7-6.
– Check that the timer/counter stops measuring.
– Turn the potentiometer slowly clockwise until the
timer/counter starts measuring.
– Check the display of the timer/counter, it shall show
1000 ± 25 MHz.
7-14 Internal Reference Oscillators
AC/DC BOARD
MAIN INPUT
AMPLIFIERS
3 GHz PRESCALER
INITIAL SETTING:
FULLY CCW
Figure 7-6 Adjusting the 3 GHz RF prescaler.
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