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Measurement Configuration
AC Signal Filter
DC Input
Resistance
Chapter 2
This section contains information to help you configure the multimeter for
making measurements. The parameters discussed in this section give you
measurement flexibility when using the
The E1412A Multimeter has three different ac filters which enable you to
either optimize low frequency accuracy or achieve faster ac settling times for
ac voltage or ac current measurements. Only these functions use the ac filter.
Table 2-4. AC Signal Filters
AC Voltage or Current
Input Frequency
3 Hz to 300 kHz
20 Hz to 300 kHz
200 Hz to 300 kHz
NOTE: These reading rates account for only the AC filters behavior.
36
See Page
for the effect of DC blocking circuitry.
•
The ac filter selection is stored in volatile memory. Default is the
medium filter (20Hz - 300kHz) at power-on or after a module reset.
•
The
CONFigure
and
select the medium (20Hz) filter.
•
Use the
[SENSe:]DETector:BANDwidth 3 | 20 | 200 | MIN | MAX
command to change the ac filter selection following a
command. The
MIN
parameter will select the 200Hz filter.
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
to the dc voltage function only.
Table 2-5. DC Voltage Input Resistance
INP:IMP:AUTO OFF
(DEFAULT)
INP:IMP:AUTO ON
•
The input resistance setting is stored in volatile memory.
INPut:IMPedance:AUTO OFF
reset.
•
The
command and the
CONFigure
automatically turn
after a
CONFigure
Agilent E1412A Multimeter Application Information
CONFigure
AC Filter
Selected
Slow filter
Medium filter
Fast filter
function
MEASure:<
>?
parameter will select the 3Hz filter and the
DC Input Resistance
100mV, 1V, 10V Ranges
10M
>10G
is set at power-on and after a module
MEASure:<
. Use
AUTO OFF
INPut:IMPedance:AUTO ON
command to set it
ON
.
command.
Max Reading Rate for
Adequate Settling
1 reading/7 seconds
1 reading/second
10 readings/second
commands automatically
CONFigure
MAX
command and this applies
DC Input Resistance
100V and 300V Ranges
10M
10MW
function
command
>?
37
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