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Nominal Traits
1–12
TDS 684A, TDS 744A, & TDS 784A Service Manual
Table 1–7: Nominal Traits — GPIB Interface, Output Ports, and Power Fuse
Name Description
Interface, GPIB GPIB interface complies with IEEE Std 488-1987
Interface, RS-232 RS-232 interface complies with EIA/TIA 574 (talk only)
Interface, Centronics Centronics interface complies with Centronics interface standard C332-44 Feb 1977,
REV A
Interface, Video VGA video output with levels that comply with EIA RS 343A standard. DB-15 connector
Logic Polarity for Main- and Delayed-
Trigger Outputs
Negative TRUE. High to low transition indicates the trigger occurred.
Fuse Rating Either of two fuses
1
may be used: a 0.25I × 1.25I (UL 198.6, 3AG): 6 A FAST, 250 V or
a 5 mm × 20 mm (IEC 127): 5 A (T), 250 V.
1
Each fuse type requires its own fuse cap.
Table 1–8: Nominal Traits — Data Handling and Reliability
Name Description
Time, Data-Retention, Nonvolatile
Memory
1
,
2
Battery life ≥ 5 years
Floppy disk 3.5 inch, 720 K or 1.44 Mbyte, DOS 3.3-or-later compatible
1
The times that reference waveforms, stored setups, and calibration constants are retained.
2
Data is maintained by small lithium-thionyl-chloride batteries internal to the memory ICs. The amount of lithium is so
small in these ICs that they can typically be safely disposed of with ordinary garbage in a sanitary landfill.