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
65.0 GHz, connect to the Band 4 input
as shown in Connection B using the ap-
propriate waveguide mixer; Option 91
(26.5 to 40 GHz) Option 92 (40 to
60 GHz), or Option 93 (60 to 90 GHz).
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 65 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
5-5
