Model 8310
IM-289A
Aeroflex / Weinschel
26
6. GENERAL CIRCUIT DESCRIPTION:
This section contains general descriptions and systematic explanation of the Model 8310’s design and
internal circuitry. Standard 8310 Series Programmable Attenuator Units contain internal circuitry to control a variety of
Aeroflex / Weinschel programmable attenuators (3200T, 150T, and 4200 Series) via front panel controls or standard
communications interfaces including GPIB (IEEE-488) and RS-232/RS-422 /RS485. Figure 5 provides a simplified
block diagram of the 8310’s internal circuitry.
Figure 5. 8310 Series Simplified Block Diagram
6-1. POWER SUPPLY ASSEMBLY:
The Model 8310 contains a high-efficiency switching type Power Supply
Assembly (A3) which will operate with a 100 to 240 Vac input power source. The input power source is routed thru the
Power Entry Module Assembly (XF1) before being applied to the Power Supply Assembly. The Power Entry Module
Assembly allows the user to select between the two operational voltage ranges that can be accepted by the Power
Supply Assembly. This Switching Power Supply provides the Model 8310 with +15 ±0.25 V @ 3.3 A outputs. These
outputs are then routed to the Programmable Interface Assembly for distribution to the other assemblies located in the
Model 8310. Drawing 193-8040 & 193-8087 shows the actual power distribution for all assemblies and modules
located in the 8310.
6-2. STATUS DISPLAYS AND SWITCH CONTROL ASSEMBLY
. This assembly located behind the front panel
contains a group of LED’s that indicates the status of bus operation and channel/port selection . The Switch/LED
Status PCB Assembly contains control switches which are used to set the GPIB address information, selected desired
port/channel, select the mode of operation (Local or Remote) and manually control and enter parameters for devices
installed in the Model 8310. These control switches operate in a toggle fashion, i.e., push for ON and push for OFF.
Refer to Section 5 for an operational description of each LED and switch located on the front panel.
6-3. DIGITAL INTERFACE ASSEMBLY
: This assembly is responsible for programming and control of the Driver PCB
Assembly, GPIB bus operation, and front panel Switch/LED control. The Digital Interface Assembly provides a high-
level interface from a standard communications interface including GPIB (IEEE-488) and RS-232/RS-422/RS485, to
the 8310’s serial Driver Interface Bus. The Device Interface Bus (DIB) is a system for connecting a number of
relatively low-speed I/O devices to a host, providing a simple, uniform, and inexpensive way to control a variety of
devices via a single port. The DIB is based on the two-wire I
2
C serial bus and several software protocol layers that
allow the
Programmable
Interface Assembly to address the internal devices, with serial data rates of up to 100 KHz.
The DIB may also be used to supply DC power to other devices that may be installed in custom applications, resulting
in a simple, low-cost interconnection system.
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