Fluke 6080A - DCFM Test 6-28.

TROUBLESHOOTING AND REPAIR
Table 6-5. FM Tests
Table 6-6. Phase Modulation Test Conditions
DCFM Test 6-28.
The DCFM Test (see Table 6-7) verifies the operation of the DCFM status indicator.
This low indicator reports the relative position of the DCFM DAC setting to the
corresponding ACFM control voltage. When the DCFM DAC is set to zero, the
indicator should report that it is too low.
Table 6-7. DC FM Tests
6-10
CODE
310
311
312
313
314
315
FM DEV
100 kHz
4 MHz
4 MHz
20 kHz
10 kHz
10 kHz
MOD FREQ
1 kHz
30 Hz
63 Hz
1 kHz
1 kHz
1 kHz
LOW-RATE FM
Off
Off
Off
Off
Off
On
EXPECTED STATE
OF FM LOOP
Locked
Unlocked
Locked
Locked
Locked
Locked
RF Frequency = 640 MHz
RF Amplitude = 0 dBm
Mod Frequency = 1 kHz
Internal FM = On
CODE
316
317
PM DEV
100 rad
10 rad
MOD FREQ
1 kHz
20 kHz
HIGH-RATE ØM
Off
On
EXPECTED STATE
OF FM LOOP
Locked
Locked
RF Frequency = 640 MHz
RF Amplitude = 0 dBm
Mod Frequency = 1 kHz
Internal ØM = On
CODE
318
DCFM DAC
0
EXPECTED STATE OF
DCFM HI/LO INDICATOR
Low
RF Frequency = 640 MHz
RF Amplitude = 0 dBm