Model 8640B TM 9-4935-601-14-7&P
OPERATOR'S CHECKS
Counter and RF Oscillator
c. Use a Type N to BNC adapter and a BNC to BNC cable to connect RF OUTPUT 9 to COUNTER INPUT 14
d. Adjust FREQUENCY TUNE 12 and FINE TUNE 11 until FREQUENCY 6 reads 0.75000 MHz. Set COUNTER
MODE EXPAND 5 to X10; FREQUENCY should read about .750000 MHz (the reading should shift one place to the
left). Set COUNTER MODE EXPAND to X100; FREQUENCY should read about 500000 MHz (the reading should
shift one additional place to the left with the decimal point and the seven no longer displayed; the OVERFLOW
annunciator lamp should light).
e. Set COUNTER MODE EXPAND 5 to OFF (buttons out). With RANGE 13 set as follows, FREQUENCY 6 should
read approximately as shown:
Figure 3-4. Operator's Checks (2 of 5)
3-8
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