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 contains test re-
cords that you can copy and use to record test results for this test. Test
records for standard 681XXA models are contained in Table 5-2A ; test
records for 681XXA models with Option 11 are contained in Table 5-2B.
Test Setup
Connect the equipment, shown in Figure 5-1, as fol-
lows:
1. Connect the 681XXA rear panel
10 MHz REF OUT
to the Frequency Counter 10 MHz External Refer-
ence input. If the Frequency Counter has an
INT/EXT toggle switch, ensure the switch is set to
EXT.
2. Connect the 681XXA
RF OUTPUT
to the Fre-
quency 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
Connection B
RF OUT
Connection A
(0.01 to 26.5 GHz)
(26.5 to 40 GHz)
10 MHz
EXT IN
RF IN
10 MHz
REF OUT
681XXA SWEEP GENERATOR
FREQUENCY COUNTER
Mixer
Band 3
Input
Band 2
Input
Band 4
Input
Figure 5-1.
Equipment Setup for CW Frequency Accuracy Test
681XXA OM
5-5
