Specifications
Setting Filter
Cutoff Frequency
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)
Setting the VT1505A
and VT1518A Current
Source SCPs
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 VT1505A Current
Source and VT1518A 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 488 µA for measuring resistances of less than 8,000 W. Select
30 µA for resistances of 8,000 W 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:
OUTP:CURR 30e-6,(@140,141)
OUTP:CURR 488e-6,(@142,143) separate command per output
level
Programming the VT1419A Multifunction
Plus
Setting Up Analog Input and Output Channels
Chapter 3 57
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