7451A/7461A/7461P Digital Multimeter Operation Manual
5.4 Auto-Zero Operation
5-13
5.4 Auto-Zero Operation
Auto-zero function eliminates the offset error in the measurement system of this instrument.
Set Auto-zero in ‘A.Zero’ in in .
If Auto-zero is set to ON, the internal offset is measured and the offset error is eliminated because the offset
is subtracted from the input measurement value. However, the measurement time is doubled.
Auto-zero is performed at the current measurement range in the measurement function and range shown in
the following table.
While no measurement is performed, Auto-zero is performed under the following conditions.
• The power is turned on.
• The setting is changed to a function in which Auto-zero is performed.
If the high-speed or high-throughput measurement is required, Auto zero can be performed only once accord-
ing to the measurement condition or measurement timing.
Table 5-3 Performing Auto-Zero
Function Range Auto-zero Indicator
DCV All Performed ON
ACV
ACV(AC+DC)
All Not performed OFF
2W
LP-2W
1 M to100 M
300 k to300 M
Not performed *1 ON
2W
LP-2W
100 to100 k
300 to30 k
Performed ON
4W
LP-4W
All Not performed OFF
DCI All Performed ON
ACI
ACI(AC+DC)
All Not performed OFF
FREQ All Not performed OFF
Diode 1000 mV
3000 mV
Performed ON
Continuity 1000
3000
Performed ON
TEMP-2W - Performed ON
TEMP-3W
TEMP-4W
- Not performed OFF
*1 Auto zero is not performed in the high resistance ranges in 2W and LP-2W mea-
surement even if Auto zero is set to ON.
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