5-5
CW FREQUENCY
ACCURACY TEST
The following test verifies that the CW frequency output of the sweep
generator is within accuracy specifications. Table 5-2, beginning on
page 5-7, contains test records that you can copy and use to record test
results for this test. Test records for standard 681XXB models are con-
tained in Table 5-2A ; test records for 681XXB models with Option 11
are contained in Table 5-2B.
Test Setup
Connect the equipment, shown in Figure 5-1, as fol-
lows:
Step 1
Connect the 681XXB rear panel
10 MHz
REF OUT
to the Frequency Counter 10
MHz External Reference input. If the Fre-
quency Counter has an INT/EXT toggle
switch, ensure the switch is set to EXT.
Step 2
Connect the 681XXB
RF OUTPUT
to the
Frequency Counter RF Input as follows:
a. For measuring frequencies of 0.01 to
1.0 GHz, connect to the Band 2 input
(Connection A).
b. For measuring frequencies of 1.0 to
26.5 GHz, connect to the Band 3 input
(Connection A).
c. For measuring frequencies of 26.5 to
40.0 GHz, connect to the Band 4 input
via the Option 91 waveguide mixer
(Connection B).
OPERATION
CW FREQUENCY
VERIFICATION
ACCURACY TEST
681XXB SWEEP GENERATOR
FREQUENCY COUNTER
RF IN
Band 2
Input
Band 3
Input
Connection A
(0.01 to 26.5 GHz)
Connection B
(26.5 to 40 GHz)
10 MHz
EXT IN
Band 4
Input
Mixer
10 MHz
REF OUT
RF OUT
Figure 5-1.
Equipment Setup for CW Frequency Accuracy Test
681XXB OM
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