Setting Filter Cutoff
The commands for programmable filters are:
INPut:FILTer[:LPASs]:FREQuency <
cutoff_freq
>,(@<
ch_list
>)
to select cutoff frequency.
and
INPut:FILTer[:LPASs][:STATe] ON | OFF,(@<
ch_list
>)
to enable or disable input filtering.
The cutoff frequency selections provided by the SCP can be assigned to any
channel individually or in groups. Send a separate command for each
frequency selection. For example:
To set 10 Hz cutoff for channels 0, 4, 6, and 10 through 19 send:
INP:FILT:LPAS:FREQ 10,(@100,104,106,110:119)
To set 10 Hz cutoff for channels 0 through 15, and 100 Hz cutoff for
channels 16 through 23 send:
INP:FILT:LPAS:FREQ 10,(@100:115)
INP:FILT:LPAS:FREQ 100,(@116:123)
or to combine into a single command message
INP:FILT:LPAS:FREQ 10,(@100:115);FREQ 100,(@116:123)
By default (after
*RST
or at power-on) the filters are enabled. To disable or re-
enable individual (or all) channels, use the
INPut:FILTer[:LPASs][:STATe] ON
command. For example, to program all but a few filters on, send:
INP:FILT:LPAS:STAT ON,(@100:163)
All channel’s filters on (same as at
*RST).
INP:FILT:LPAS:STAT OFF,(@100,123,146,163)
Only channels 0, 23, 46, and 63
OFF.
Setting Current
Sources
Current Source SCPs supply excitation current for all resistance type
measurements. These include resistance, and temperature measurements
using resistance temperature sensors. The commands to control Current
Source SCPs are
OUTPut:CURRent:AMPLitude <
amplitude
>,(@<
ch_list
>)
and
OUTPut:CURRent[:STATe] <
enable
>
.
•
The
<
amplitude
>
parameter sets the current output level. It is
specified in units of ADC and for the HP E1505 Current Source SCP
can take on the values
30e-6
(or
MIN
), and
488e-6
(or
MAX
). Select
488
µ
A
for measuring resistances of less than 8,000 Ohms. Select
30
µ
A
for resistances of 8,000 Ohms and above.
•
The
<
ch_list
>
parameter specifies the Current Source SCP channels
that will be set.
Chapter 3
Using the HP E1313/E1413 71
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