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Installation and Configuration
Internal PCB Jumper Selections
Release 3.1 29
Control Mode Selection” shows a table of jumper settings and OVP programming
selection. Refer to “Basic Setup Procedure” on page 23 for the positions of the
jumpers on the GPIB PCB.
Table 2.6 OVP Control Mode Selection
TTL
Shutdown
You can use the Shutdown function to disable or enable the supply's output.
Disabling the supply using TTL shutdown allows you to make adjustments to the
load or to the power supply without shutting down the power supply. With the
GPIB interface installed, TTL shutdown is activated by a TTL signal to Pin 1 of the
J7 connector on the interface subplate. The shutdown user line uses a 0-5Vdc TTL
input with a high signal range of 2.2-5.0Vdc. The current range of the shutdown
line is 1-10mA. See Figure 2.5, “J7 User Signal Connector Circuit Block Diagram”
on page 31 for a schematic of the J7 connector containing the shutdown user line.
You can select the logic level of the TTL input by changing the J93 connector on
the GPIB PCB. Table 2.7 shows the TTL signal levels for the J93 jumper settings.
See Figure 2.2-3 for the location of the J93 jumper on the printed circuit board.
Table 2.7 Switch Settings for TTL Shutdown Circuit Logic
PCB Jumper
J65 Position
PCB Jumper
J103 Position
OVP Programming Selection
Closed (default) Closed (default) Software or Front Panel OVP control
(dependent on the power supply operating state)
Closed Open Software OVP control only
Open Closed Front Panel OVP control only
Open Open Front Panel OVP control only
PCB Jumper J93 Position TTL Signal Level Supply Output Condition
Pin 2 to Pin 3 (default) HIGH
LOW
OFF
ON
Pin 1 to Pin 2 HIGH
LOW
ON
OFF