Setting Filter Cutoff Frequency - HP E1419A User Manual

Setting Filter
Cutoff Frequency
Setting the HP E1505
and HP E1518 Current
Source SCPs
58 Programming the HP E1419A
The commands for programmable filters are:
INPut:FILTer[:LPASs]:FREQuency <cutoff_freq>,(@<ch_list>) to select
cutoff frequency
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 40, 44, 46, and 48 through 51 send:
INP:FILT:FREQ 10,(@140,144,146,148:151)
To set 10 Hz cutoff for channels 56 through 59, and 100 Hz cutoff for
channels 60 through 633 send:
INP:FILT:FREQ 10,(@156:159)
INP:FILT:FREQ 100,(@160:163)
By default (after *RST or at power-on) the filters are enabled (ON). To
disable or re-enable individual (or all) channels, use the INP:FILT ON |
OFF, (@<ch_list>) command. For example, to program filters for channels
56 and 57 off, send:
INP:FILT:STAT Off,(@156:157)
The Current Source SCP supplies excitation current for resistance type
measurements. These include resistance, and temperature measurements
using resistance temperature sensors. The commands to control the
HP E1505 Current Source and HP E1518 Resistance Measurement 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 Amps DC and can take on the values 30e-6 (or MIN), and
488e-6 (or MAX). Select 488µA for measuring resistances of less
than 8,000 Ohms. Select 30µA for resistances of 8,000 Ohms and
above.
•
The ch_list parameter specifies the Current Source SCP channels that
will be set.
To set channels 40 and 41 to output 30 µA and channels 42 and 43 to output
488 µA:
Chapter 3