AC voltage offset
The Model 2000, at 5½ digits resolution, will typically display 100 counts of offset on AC
volts with the input shorted. This offset is caused by the offset of the TRMS converter. This
offset will not affect reading accuracy and should not be zeroed out using the REL feature. The
following equation expresses how this offset (V
OFFSET
) is added to the signal input (V
IN
):
Example: Range = 1VAC
Offset = 100 counts (1.0mV)
Input = 100mV RMS
The offset is seen as the last digit, which is not displayed. Therefore, the offset is negligible.
If the REL feature were used to zero the display, the 100 counts of offset would be subtracted
from V
IN
, resulting in an error of 100 counts in the displayed reading.
See Section 3 — Measurement Options for information that explain the configuration options
for DC and AC voltage measurements.
Displayed reading V
IN
()
2
V
OFFSET
()
2
+=
Displayed reading 100mV()
2
1.0mV()
2
+=
Displayed reading 0.01V()110
6–
V×()+=
Displayed reading 0.100005 =
Basic Measurements 2-21
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