User Manual
18-22 SCPI Command Reference 2400 Series SourceMeter
®
 User’s Manual 
:SYSTem
:AZERo Control auto zero and NPLC caching. ✓
[:STATe] <name> Control auto zero (OFF = disabled; 
ON = enabled; ONCE = force immediate 
update of auto zero.)
ON ✓
[:STATe]? Query auto zero state. ✓
:CACHing Control NPLC caching.
[:STATe]<b> Enable (ON or 1) or disable (OFF or 0) 
NPLC caching.
OFF
[:STATe]? Query NPLC caching state.
:REFResh Force an immediate update for all NPLC 
values in cache.
:RESet Clear the cache of all NPLC values.
:NPLCycles? Return a list of NPLC values in the 
cache from oldest to newest.
:LFRequency <freq> Select line frequency: 50 or 60 (Hz):
:AUTO <b> Enable or disable auto frequency.  (Note 1)
:AUTO?  Query state of auto frequency.
:LFRequency? Query line frequency.
:TIME Timestamp: 
:RESet Reset timestamp to zero seconds.
:AUTO <b> Enable/disable timestamp reset when 
exiting idle.
OFF
:TIME? Query timestamp.
:MEMory Initialize memory:
:INITialize Initialize battery backed RAM.
✓
:LOCal Take unit out of remote (RS-232 only). ✓
:RWLock <b> Enable or disable local lockout (RS-232 
only).
:RCMode <name> Set auto range on compliance mode 
(SINGle or MULTiple).
SINGle
:RCMode? Query auto range on compliance mode.
:MEP Path to 488.1 protocol (Appendix G).
[:STATe]? Query protocol (1 = SCPI, 0 = 488.1).
:HOLDoff <b> Enable/disable NDAC hold-off. OFF
1. The auto line frequency setting is not affected by *RST and :SYSTem:PRESet.
Table 18-9 (continued)
SYSTem command summary
Command Description
Default 
parameter SCPI
Source 
memory










