Manual - 8500A Series Peak Power Meter - Giga-tronics

Series 8500A Peak Power Meters
4.2.2 GPIB/CAL Control PC board (A3)
See Figure 4-2 and schematic diagram #21015 in Chapter 8.
Figure 4-2. GPIB/Cal Control (A3) Block Diagram
The GPIB/Cal Control PC board circuitry performs a number of functions. The board is the interface to
the detector PROMs. It contains the sound generator for clicks and beeps as described in Chapter 3, and
it also has the GPIB interface and calibrator control circuitry.
With reference to Sheet 1 of DWG# 21015, the GPIB interface is through U1, buffered by U2 and U4.
U1 performs the proper interfacing between the GPIB and the data and address lines, and the chip select
4-4 Manual No. 20790, Rev C, November 1998
Superceded by Revision D, March 2009