13-6
DISPlay, FORMat, and SYSTem
Model 6485 Picoammeter Instruction Manual
B) FORMat:ELEMents <item list>
Parameters
READing = Current reading
UNITs
=
Units (always Amps)
TIME
= Timestamp
STATus
=
Status information
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, STATus” to include
all elements in the data string. The elements for the ASCii format are shown in
An overflow or overvoltage reading is returned as +9.9E37. When a specified data element
has invalid data associated with it, NAN (Not A Number) will be the response. NAN is
returned as +9.91E37.
Units
— Units reference the returned readings units of measure. This will always be in
amps with the current reading in scientific notation.
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 6485 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.
Bit 2
(Math) — Set to 1 when measurement performed with CALC1 enabled.
Bit 3
(Null) — Set to 1 if null for CALC2 is enabled.
Bit 4
(Limits) — Set to 1 if a limit test (CALC2) is enabled.
Bits 5 and 6
(Limit Results) — Provides limit test results:
Summary of Contents for 6485
Page 20: ......
Page 24: ......
Page 44: ...1 20 Getting Started Model 6485 Picoammeter Instruction Manual ...
Page 66: ...3 6 Measurements Model 6485 Picoammeter Instruction Manual ...
Page 138: ...9 20 Remote Operation Model 6485 Picoammeter Instruction Manual ...
Page 159: ...11 CommonCommands ...
Page 164: ...11 6 Common Commands Model 6485 Picoammeter Instruction Manual ...
Page 165: ...12 SCPISignalOriented MeasurementCommands ...
Page 190: ...14 12 SCPI Reference Tables Model 6485 Picoammeter Instruction Manual ...
Page 214: ...16 14 Calibration Model 6485 Instruction Manual ...
Page 219: ...A Specifications ...
Page 221: ...B StatusandErrorMessages ...
Page 227: ...C GeneralMeasurement Considerations ...
Page 233: ...D DDCEmulationCommands ...
Page 247: ...E ExamplePrograms ...
Page 250: ...E 4 Example Programs Model 6485 Picoammeter Instruction Manual ...
Page 251: ...F IEEE 488BusOverview ...
Page 266: ...F 16 IEEE 488 Bus Overview Model 6485 Picoammeter Instruction Manual ...
Page 267: ...G IEEE 488andSCPI ConformanceInformation ...
Page 311: ......