
Adjustments 8712ET/ES and 8714ET/ES
Frequency Accuracy Adjustment RF Network Analyzers
2-6 Service Guide
2.Set the frequency counter input switches to the “10 Hz – 500 MHz” and 50Ω positions.
3.On the analyzer, press (seecaution on page 2-2)
. If the frequency counter reading is 500 MHz±2500 Hz, you
do not need to make this adjustment. However, you can still make this adjustment to
improve the frequency accuracy.
4.To proceed with the adjustment, disconnect the frequency counter and adapter(s) from
the analyzer’s RF OUT/ PORT 1 port (seeFigure 2-1on page2-5).
5.Remove the handles and front panel by following these steps and referring to
Figure2-2.
a.Remove the trim strip from the handles.
b.Remove the screws attaching each handle to the analyzer.
c.Pull the analyzer toward you until it extends about two inches over the edge of the
table top.
d.Grasp and pull the front panel with two hands: one on the top-middle of the panel,
and the other on the bottom-middle of the panel.
Figure 2-2 Removing the Handles and Front Panel
6.Reconnect the frequency counter and adapter(s) to the RF OUT/PORT 1 port (see
Figure 2-1on page2-5).
7.To obtain a counter reading of 500 MHz±2500 Hz or better, adjust R204 on the
fractional-N/reference assembly (A3) (accessible through a hole in shield of the A3
assembly).
8.Reassemble the analyzer.
PRESET FREQ
CW
500
MHz
MENU
Trigger Hold
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