Service manual

68P81076C25-C July 1, 2002
Troubleshooting Waveforms: ASTRO Spectra Waveforms 6-3
Waveform W4: ABACUS Programming at Mode Change
Waveform W5: ABACUS/ADSIC Interface
T
13 Acquisitions
Tek stopped:
T
1
Ch1
M 10.0us Ch1 2.2 V
W4: ABACUS programming
captured during mode change.
Trace 1 - (ADSIC) SBI
MAEPF-24379-O
Ch1 Freq
74.610kHz
2.00V
34513 Acquisitions
Tek stopped:
T
3
Ch3
1
2
Ch1 Ch2
M 5.00us Ch1 2.2 V
Note 2: Since these signals are a differential
current loop these voltages are very low.
MAEPF-24380-O
2
W5: ABACUS/ADSIC Interface.
Receiving 1KHz tone @ 3KHz deviation,
-60dbm.
Trace 1 -IDC (2.4MHz)
Trace 2 - DOUT
TRACE 3 - DOUT*
Ch1 Freq
2.251920 MHz
Low resolution
2.00V
500mV
500mV
T