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SECTION 4
IEEE-488 Reference
CALIBRATION - Set when calibration results in a cal constant value that is not within allow-
able limits. Repeated failure may indicate that the Model 486/487 is defective. See service infor-
mation in this manual.
E2PROM DEFAULTS-Set
when power-up checksum test on defaults fail.
E2pROM CAL CONSTANTS-Set
when power-up checksum test on cal constants fail.
V-SOURCE CONFLICT-
Set when tryins to send a voltage source value to the Mode1487 that
exceeds the maxim um limit of the currently selected voltage sauce range. On the Model 486,
this bit is always reset to "0".
V-SOURCE-On
the Model 487, this bit is set when trying to place the voltage source in oper-
ate while the enabled interlock is open. On the Model 486, this bit is always reset to "0".
U2 Model Number and Firmware Revision
By sending the UZ command and addressing the instrument to talk, the instrument model
number and software revision level can be obtained. For example, if the software revision level
of a Model 486 is A03, the following ASCII string will be obtained using the UZ conunandz
486AO3
Note: There are two trailing blanks in this response message.
U3 Calibration Value
By sending the U3 comman d and addressing the instrument to talk, the last calibration vatue
sent can be obtainad. For example, if no calibration value has been sent, the following ASCII
string will be obtained using the U3 command:
U4 Trigger Interval
BysendingtheU4comman
d and addressing the instrument to talk, the currently programmed
Irigger interval (Q, can be obtained. For example, if the currently programmed trigger interval
is 1.236 seconds, the following ASCII string will be obtained using the U4 command:
TI=GUl.Z36E+COS
U5 Trigger Delay
By sending the U5 command and addressing the instrument to talk, the currently programmed
trigger delay 0
can be obtained. For example, if the currently programmed trigger delay is
two seconds, the following ASCII string will be obtained using the U5 command:
TD=002.DLXE+COS
4-35
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