KEPCO BIT 4886 Operator Manual - Manual (Page 43)

BIT 4886 120413
4-9
4.3.3 BOP TEST
The DIAG:TST? Command performs a test of the BOP instrument. The test includes the BIT
4886 internal tests of the DAC (Digital to Analog Converter), Limit and Op Amp circuits. If suc-
cessful it programs the BOP in voltage mode to the positive and negative limits of the device. It
also verifies the Limit operation of the unit in current mode by setting the unit for the rated maxi-
mum current delivery and verifies that the voltage limit set at one volt operates correctly. It also
tests the readback voltages in both high and low scales.
CAUTION: TO AVOID DAMAGE TO THE LOAD, DISCONNECT THE LOAD BEFORE ISSU-
ING THIS COMMAND. (DURING THE SELF-TEST, THE BOP IS PRO-
GRAMMED TO FULL SCALE POSITIVE AND FULL SCALE NEGATIVE
OUTPUT.)
This command returns a 0 for pass, or a number from 1 through 1023 to indicate the cause of
the error. The test executes each of the subtests even when any one fails. If any test fails, a bit
is set in the error code which is returned to the user. The error codes returned are listed in Table
4-1.
4.4 IEEE 488 (GPIB) BUS PROTOCOL
Table 4-2 defines the interface capabilities of the Interface Card (Talker/Listener) relative to the
IEEE 488 (GPIB) bus (reference document ANSI/IEEE Std 488: IEEE Standard Digital Interface for
Programmable Instrumentation) communicating with a Host Computer–Controller (Talker/Lis-
tener).
Tables 4-3 and 4-4 define the messages sent to the Interface Card, or received by the Interface
Card, via the IEEE 488 bus in IEEE 488 command mode and IEEE 488 data mode, respectively.
TABLE 4-2. IEEE 488 (GPIB) BUS INTERFACE FUNCTIONS
FUNCTION
SUBSET
SYMBOL
COMMENTS
Source Handshake SH1 Complete Capability (Interface can receive multiline messages).
Acceptor Handshake AH1 Complete Capability (Interface can receive multiline messages).
Talker T6
Basic talker, serial poll, unaddress if MLA (My Listen Address) (one-byte
address).
Listener L4 Basic listener, unaddress if MTA (My Talk Address) (one-byte address).
Service Request SR1
Complete Capability. The interface sets the SRQ line true if there is an
enabled service request condition.
Remote/Local RL2 No Local lock-out.
Parallel Poll PP0 No Capability.
Device Clear DC1
Complete Capability. Controller sends DCL (Device Clear) and SDC
(Selected Device Clear) to selected power supply.
Device Trigger DT1 Complete Capability.
Controller C0 No Capability.