Introduction 8
CG635 Synthesized Clock Generator
Rear-Panel Overview
The rear panel provides connectors for AC power, GPIB/RS-232 computer interfaces,
chassis ground, external timing references, clock edge timing modulation, additional
clock outputs, and an optional, pseudo-random binary sequence generator (see Figure 2).
Figure 2: The CG635 Rear Panel
AC Power
The Power Entry Module is used to connect the CG635 to a power source through the
power cord provided with the instrument. The center pin is connected to the CG635
chassis so that the entire box is grounded.
The source voltage requirements are: 90 to 132 VAC or 175 to 264 VAC, 47 to 63 Hz (80
VA total).
Connect the CG635 to a properly grounded outlet. Consult an electrician if necessary.
GPIB
The CG635 comes standard with a GPIB (IEEE-488) communications port for
communications over a GPIB bus. The CG635 supports the IEEE-488.1 (1978) interface
standard. It also supports the required common commands of the IEEE-488.2 (1987)
standard.
Before attempting to communicate with the CG635 over the GPIB interface, the port
must be enabled via the front panel. Do this by sequentially pressing the following keys
located in the ENTRY section: ‘SHIFT’, ‘GPIB’, ‘Hz’. The GPIB address can be
changed by pressing the keys ‘SHIFT’, ‘ADDRS’. Use the MODIFY ‘UP’ and ‘DOWN’
keys to select the desired address. Press ‘Hz’ to complete change.
