Model 6487 Reference Manual DISPlay, FORMat, and SYSTem 13-7
B) FORMat:ELEMents <item list>
Parameters READing = Current or ohms reading
UNITs = Units
TIME = Timestamp
STATus = Status information
VSOurce = Voltage source value
ALL = All data elements
DEFault = All except VSOurce
The specified elements are included in the data string in response to :FETCh?, :READ?,
:MEASure?, and :TRACe:DATA?. Note that each element in the item list must be sepa-
rated by a comma (i.e. send “:ELEMents READing, UNITs, TIME”) to include the read-
ing with units and the time elements in the data string. The elements for the ASCii, ALL
format in the order sent are shown in Figure 13-1. Note that elements are delimited with
commas.
Reading — Returns the current reading for the current function or the ohms readings if
ohms is enabled. An overflow reading is returned as +9.9E37. When a specified data ele-
ment has invalid data associated with it, NAN (Not A Number) will be the response. NAN
is returned as +9.91E37. -9.9e+36 will be returned for any ohms reading taken when the
voltage source was in compliance.
Units — Units reference the returned readings units of measure. For the current function,
“A” will be returned. For the ohms function, “OHMS” will be returned.
Voltage source — This element returns the programmed voltage source value in volts
when the voltage source is in operate. Zero will be returned when the voltage source out-
put is off. -999 will be returned if the voltage source was in compliance.
Timestamp — Timestamp references the returned data string to a point in time. The
timestamp operates as a timer that starts at zero seconds when the instrument is turned on
or when the timestamp is reset (SYSTem:TIME:RESet). After 99,999.99 seconds, the
timer resets to zero and starts over.
For buffer readings, timestamp can be referenced to the first reading stored in the buffer
(absolute format) which is timestamped at 0 seconds or to the time between each stored
reading (delta format). The TRACe:TSTamp:FORMat command is used to select the
timestamp format.
Status — The status word provides information about Model 6487 operation. The 16-bit
status word is sent in decimal form. The decimal value has to be converted to the binary
equivalent to determine the state of each bit in the word. For example, if the returned status
value is 9, the binary equivalent is 00000001001. Bits 0 and 3 are set. The bits are
explained as follows:
Bit 0 (OFLO) — Set to 1 if measurement performed while in over-range (overflowed
reading).
Bit 1 (Filter) — Set to 1 when measurement performed with the averaging filter enabled.
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