PERFORMANCE TESTS
FREQUENCY ACCURACY TEST 4-4.
The internal time base is compared to that of a Frequency Standard.
REQUIREMENTS:
The frequency of the UUT time base is within the specified limits.
TEST EQUIPMENT:
• Frequency standard
• Frequency counter
PROCEDURE:
1. Connect the frequency standard output to the 10 MHZ REF IN connector on the
frequency counter and switch the counter to EXT REF.
2. Switch the UUT to internal reference.
3. Connect the UUT REF OUT connector to the frequency counter CHANNEL A
input connector.
4. Verify that the counter display is 10 MHz ±100 Hz.
5. Monitor the frequency for one hour to verify its stability within ±0.5 Hz.
(Operating temperature within ±5°C).
SYNTHESIS TEST 4-5.
The signal generator output frequency is measured at several programmed frequencies
using a frequency counter operating on a common reference with the signal generator.
REQUIREMENT:
The signal generator's measured and programmed frequencies agree within ±1 count.
TEST EQUIPMENT:
• Frequency counter
REMARKS:
If the UUT fails this test, the frequency synthesis circuitry is probably at fault. See
Section 6C.
PROCEDURE:
1. Connect the UUT 10 MHz OUT to the frequency counter 10-MHz reference input,
and connect the UUT RF OUTPUT to the frequency counter input.
2. Set the UUT REF INT/EXT switch to INT.
3. Program the UUT to SPCL 909.
4-5
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