1-10. DESCRIPTION OF ELECTRONIC STATION (cont)
b.1 TEMPERATURE CONTROL UNIT 1A1
The temperature control unit is an electronic assembly containing front and
rear panel controls, indicators, electrical connectors, and an ac power cable. The
front panel has a seven-segment temperature display, thumbwheel switches to set the
source A and source temperatures, a joystick connector, and several switches and
On the rear panel are connectors for the source A, B, and C inputs and
a power input connector.
Also on the rear panel are a GPIB interface bus connector
and a GPIB address switch.
The GPIB address switch is used to set the unique
address of the temperature control unit to allow for the interchange of electronic
data between the control unit and other electronic equipment. A ground lead
connects to system ground.
The temperature control unit is mounted to drawer slides
so that it can be pulled out from the electronic station cabinet for maintenance
The front panel will swing open for access to internal components. A
master power switch on the rear panel is normally left in the ON position and the
unit is powered up when EO bench power is applied.
+/- 0.003°C short term
+/- O.O1°C long term
O.O1°C, all sources
Length 18.88 in
Weight 30 lb
115v 60 Hz
c. CONTROL UNIT ASSEMBLY 1A1 (ALTERNATE)
The control unit assembly 1A1 consists of a temperature controller (DBA Model
220) and drawer slides.
The temperature controller is an electronic assembly
containing front and rear panel controls, indicators, electrical connections and ac
A ground lead is installed on the rear panel and connects to an
electronic station ground terminal.
On the front panel are thumbwheel temperature
setting controls, temperature meter, switches, and LED indicators DS1 thru DS13.
The front panel is hinge-mounted and will swing open after loosening two panel
CCAs, sensitive board mounted adjustable resistors, LED indicators, and
other electronic devices are located inside the temperature controller. Four LED
indicators, visible when-the front panel is open, are used to determine if the
IEEE-488 bus is functioning.
Each LED identity is placarded on the appropriate CCA.
The following table identifies the LED placard and function.