Model 8640B TM 9-4935-601-14-7&P
PERFORMANCE TESTS
4-43. INTERNAL REFERENCE ACCURACY TEST (Cont'd)
EQUIPMENT:
Frequency Counter............................................................... HP 5327C OPT H49
Temperature Controlled Chamber......................................... Statham Model 325
PROCEDURE:
1. Connect equipment as shown in Figure 4-29. Check that TIME BASE REF INT/EXT switch on the rear panel is set to
INT.
2. Set chamber for various temperatures between 150 and 350C. At each temperature, allow generator to stabilize for
two hours, then measure the frequency. It should be 5 MHz ± 5 Hz.
4,999,995 5,000,005 Hz
3. Set the chamber for various temperatures between 0° and 55°C. Again, allow the generator to stabilize for two hours
at each temperature and measure the frequency. It should be 5 MHz ±15 Hz.
4,999,985 5,000,015 Hz
4-44. INTERNAL REFERENCE DRIFT RATE (STABILITY) TEST
SPECIFICATION:
Drift Rate: (after 2-hour warm-up)
Time: <0.05 ppm per hr., <2 ppm per yr.
Temperature: <2 ppm total variation for room ambient 150 to 350C.
Line Voltage: <0.1 ppm.
NOTE
Because the phase lock mode references the generator's RF oscillator to the counter's frequency
reference, the following frequency specifications are also checked in this test.
Frequency Stability (phase lock mode):
Time: <0.05 ppm/hr.
Temperature: <2 ppm total variation (room ambient 150 to 35°C).
Line Voltage (+5% to -10% change): <0.1 ppm.
Load (with any passive load change): None measurable.
Level Change (10 dB on output level vernier): None measurable.
Mode Change (CW to FM): None measurable.
4-72
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