5-4
Relative, mX+b, m/X+b (reciprocal), and log
Model 6485 Picoammeter Instruction Manual
SCPI programming — relative
A) :FEED <name>
Specify reading to Rel
With SENSe[1] selected, the Rel operation will be performed on the input signal. With
CALCulate[1] selected, the Rel operation will be performed on the result of the mX+b or
m/X+b calculation.
B) :STATe <b>
Toggle state of Rel
This command toggles the state of Rel without acquiring new values. This operation is dif-
ferent than the REL key from front panel (which toggles the Rel state) — the front panel
key acquires new values when pressed (unless CONFIG is pressed first). If a NULL value
has not been acquired before enabling Rel, 0.00 will be used.
C) :DATA? and :DATA:LATest?
With Rel enabled, these commands will return one or more Rel’ed readings. They will not
trigger fresh (new) readings. Use the INITiate command to trigger new readings (see
for details on INITiate).
If the instrument is programmed to perform a finite number of measurements, the :DATA?
command will return all the Rel’ed readings after the last reading is taken. The
:DATA:LATest? command will only return the last (latest) Rel’ed reading.
Table 5-2
SCPI commands — relative (null)
Commands
Description
Default
Ref
DDC
CALCulate2
Path to configure and control limit testing (CALC2):
:FEED <name>
Specify reading to Rel; SENSe[1] or CALCulate[1].
SENS
A
:NULL
Configure and control Relative.
:ACQuire
Use input signal as Rel value.
Z1
:OFFSet <NRf>
Specify Rel value; -9.999999e20 to 9.999999e20.
0.0
:STATe <b>
Enable or disable Rel.
OFF
B
Z0 (Off)
:DATA?
Return Rel’ed readings triggered by INITiate.
C
:LATest?
Return only the latest Rel’ed reading.
C
INITiate
Trigger one or more readings.
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