Chapter 6 Command Reference 157
ACAL
ACAL
Autocal. Instructs the multimeter to perform one or all of its self calibrations.
Syntax ACAL [type][,security_code]
type The type parameter choices are:
Power-on type = none.
Default type = ALL.
security_code When autocal is secured, you must enter the correct security code to perform an
autocal. When autocal is not secured, no security code is required. Refer to the
SECURE command for more information on the security code and how to secure
or unsecure autocal.
Remarks • Since the DCV autocal applies to all measurement functions, you should
perform it before performing the AC or OHMS autocal. When ACAL ALL is
specified, the DCV autocal is performed prior to the other autocals
• The multimeter should be in a thermally stable environment with its power
turned on for at least 2 hours before performing any autocal. For maximum
accuracy, you should perform ACAL ALL once every 24 hours or when the
multimeter's temperature changes by ± 1°C from when it was last externally
calibrated or from the last autocal.
• The AC autocal performs specific enhancements for ACV or ACDCV (all
measurement methods), ACI or ACDCI, DSAC, DSDC, SSAC, SSDC, FREQ,
and PER measurements.
• The OHMS autocal performs specific enhancements for 2- or 4-wire ohms, DCI,
and ACI measurements.
• Always disconnect any AC input signals before you perform an autocal. If you
leave an input signal connected to the multimeter, it may adversely affect the
autocal.
• The autocal constants are stored in continuous memory (they remain intact when
power is removed). You do not necessarily need to perform autocal simply
because power has been cycled.
type
Parameter
Numeric
Query
Equiv. Description
ALL 0 Performs the DCV, OHMS, and AC autocals
DCV 1 DC voltage gain and offset (see first Remark)
AC 2 ACV flatness, gain, and offset (see second Remark)
OHMS 4 OHMS gain and offset (see third Remark)
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