Setting Up Analog Input And Output Channels; Configuring Programmable Analog Scp Parameters; Configuring Programmable Scp Parameters - HP E1419A User Manual

Setting up Analog Input and Output Channels

Configuring
Programmable
Analog SCP
Parameters
Note
Setting SCP Gains
Chapter 3
This section covers configuring input and output channels to provide the
measurement values and output characteristics that your algorithms need to
operate.
This step applies only to programmable Signal Conditioning Plug-ons such
as the HP E1503 Programmable Amplifier/Filter SCP, the HP E1505
Current Source SCP, the HP E1518 Resistance Measurement SCP, the HP
E1510 Sample and Hold SCP, and the HP E1511 Transient Strain SCP. See
the particular SCP's User's manual to determine the gain, filter cutoff
frequency, or excitation amplitude selections that it may provide.
The HP E1419A only supports these programmable analog SCPs on SCP
positions 4 through 7.
An important thing to understand about input amplifier SCPs is that given a
fixed input value at a channel, changes in channel gain do not change the
value your algorithm will receive from that channel. The DSP chip (Digital
Signal Processor) keeps track of SCP gain and Range Amplifier settings,
and "calculates" a value that reflects the signal level at the input terminal.
The only time this in not true is when the SCP gain chosen would cause the
output of the SCP amplifier to be too great for the selected A/D range. As an
example; with SCP gain set to 64, an input signal greater than ±0.25 volts
would cause an over-range reading even with the A/D set to its 16 volt
range.
The gain command for SCPs with programmable amplifiers is:
INPut:GAIN <gain>,(@<ch_list>) to select SCP channel gain.
The gain selections provided by the SCP can be assigned to any channel
individually or in groups. Send a separate command for each gain selection.
An example for the HP E1503 programmable Amp&Filter SCP:
To set the SCP gain to 8 for channels 40, 44, 46, and 48 through 51 send:
INP:GAIN 8,(@140,144,146,148:151)
To set the SCP gain to 16 for channels 56 through 59, and to 64 for channels
60 through 63 send:
INP:GAIN 16,(@156:159)
INP:GAIN 64,(@160:163)
Programming the HP E1419A 57