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Keysight E1412A Digital Multimeter User Guide
Keysight E1412A Multimeter Application Information
Measurement Configuration
DC Input Resistance
The E1412 Multimeter's input resistance is normally fixed at 10M
for all dc
voltage ranges to minimize noise pickup. You can set the input resistance to
greater than 10G
for the 100mVdc, 1Vdc and 10Vdc ranges to reduce the
effects of measurement loading errors. You select increased input resistance
using the
INPut:IMPedance:AUTO ON
command and this applies to the dc
voltage function only.
–
The input resistance setting is stored in volatile memory.
INPut:IMPedance:AUTO OFF
is set at power-on and after a module reset.
–
The
CONFigure
command and the
MEASure:<
function
>?
command
automatically turn
AUTO OFF
. Use
INPut:IMPedance:AUTO ON
after a
CONFigure
command to set it
ON
.
Resolution
Resolution is expressed in terms of number of digits the multimeter can measure.
You can set the resolution to 4½, 5½ or 6½-digits by specifying the integration
time (PLCs or aperture time), which is the period the multimeter's
analog-to-digital (A/D) converter samples the input signal for a measurement.
To increase measurement accuracy and improve noise rejection, specify more
PLCs (longer integration time). To increase measurement speed, specify fewer
PLCs (shorter integration time). This applies to all measurement functions.
The resolution for math operations is the same resolution for the measurement
function being measured. Table 7 illustrates the correlation between Number of
Power Line Cycles and Resolution. See the tables for detailed cross-reference of
function ranges to resolution as a function of NPLCs or Aperture Time.
Table 2-5
DC Voltage Input Resistance
DC Input Resistance
100mV, 1V, 10V Ranges
DC Input Resistance
100V and 300V Ranges
INP:IMP:AUTO OFF
(DEFAULT)
10M
10M
INP:IMP:AUTO ON
>10G
10MW
Table 2-6
Resolution of Power Line Cycles
Number of Power Line Cycles
(NPLC)
Resolution
0.02
0.0001 X Full-Scale
0.2
0.00001 X Full-Scale
1
0.000003 X Full-Scale
Summary of Contents for E1412A
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