Hardware Reference
In-Depth Information
Figure 12.2
Simplified block schematic of the GT200 digital frequency meter
Hardware
The Guide Technology GT200 Universal Counter was chosen to provide the
frequency measuring facility in conjunction with a Samsung AT-compatible
microcomputer which already resides in the client's RF laboratory. The GT200
takes the form of a full-size PC-compatible expansion card which is supplied
together with a device driver (GT200.SYS) and virtual front panel software
(VIRT.EXE) on a floppy disk. The simplified block schematic of the GT200 is
shown in Figure 12.2.
The GT200 is supplied together with a device driver (GT200.STS) and virtual
front panel software (VIRT.EXE) on floppy disk. The disk also contains software
which assists with setting the base address switch and includes a program which
allows users to test the GT200's programming commands.
The GT200 offers a variety of measuring facilities including frequency
measurement (from DC to 100 MHz, with automatic pre-scaling above about
1 MHz),
fast frequency measurement (a special mode for high-speed data
