2. Record the Frequency Counter reading on the
Test Record. The Frequency Counter reading
must be within
±
100 Hz of the displayed 690XXB/
691XXB frequency to accurately complete this
test.
3. On the 690XXB/691XXB, use the cursor control
key (diamond-shaped key) to increment F1 to the
next test frequency on the Test Record. Record
the Frequency Counter reading on the Test Re-
cord.
4. Repeat step 3 until all frequencies listed on the
Test Record have been recorded.
Fine Loop Test
Procedure
The following procedure tests the fine loop by step-
ping the instrument through ten 1 kHz steps (ten
100 Hz steps for instruments with Option 11) and
measuring the RF output at each step.
1. Set up the 690XXB/691XXB as follows:
a. Reset the instrument by pressing
SYSTEM
,
then
Reset
. Upon reset, the CW Menu is dis-
played.
b. Press
Edit F1
to open the current frequency
parameter for editing.
c. Set F1 to the first test frequency indicated on
the Test Record.
2. Record the Frequency Counter reading on the
Test Record. The Frequency Counter reading
must be within
±
100 Hz of the displayed
690XXB/691XXB frequency (
±
10 Hz for instru-
ments with Option 11) to accurately complete this
test.
3. On the 690XXB/691XXB, use the cursor control
key (diamond-shaped key) to increment F1 to the
next test frequency on the Test Record. Record
the Frequency Counter reading on the Test Re-
cord.
4. Repeat step 3 until all frequencies listed on the
Test Record have been recorded.
690XXB/691XXB MM
3-11
PERFORMANCE
FREQUENCY
VERIFICATION
SYNTHESIS TESTS
NOTE
The Frequency Counter reading is
typically within
±
1 Hz because the
instruments use a common time
base. Differences of a few Hertz can
be caused by noise or counter limita-
tions. Differences of
³±
100 Hz indi-
cate a frequency synthesis problem.
Summary of Contents for 680 C Series
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