Remote Operation
Optimizing System Speed for I/O Operation
3
Note
The remote interface port and settings can be changed only through the
Meter’s front-panel controls.
Enabling or selecting a port for remote operation is a separate process from setting the
various parameters associated with a remote interface. An interface does not have to be
selected to set its parameters; for example, the baud rate of the RS-232 port can be set
while the Meter has the LAN port enabled as the remote control port.
Optimizing System Speed for I/O Operation
Several factors affect the remote system speed of the 8845A/46A. To make the fastest
measurements, it is best to store the measurements in internal memory before transferring
across the I/O bus. This is particularly true if you want to collect a large number of
samples per measurement. Set up all of the parameters (i.e. function, range, filters, etc...)
prior to taking the measurements. Use the internal trigger. Set the trigger delay to zero.
Turn off the display. If operating with RS-232, use the fastest baud rate available.
One example of taking fast voltage readings is:
*cls # This clears all error prior to initiating readings
conf:volt:dc 0.1 # Set the DC range to manual and 100 mV.
volt:dc:nplc 0.02 # Set the NPLC to faster reading rate 4 1/2 digits.
zero:auto 0 # Turn Autozero off.
trig:sour imm # Set immediate trigger.
trig:del 0 # Set trigger delay to zero.
trig:coun 1 # Set trigger count to one or specify a larger number.
disp off # Turn display off. This may slightly improve reading rate.
syst:rem # Put the 8846A in remote. Only needed for RS-232 or Ethernet
#(required for READ? or MEAS?)
samp:coun 100 # Set the sample count from 1 to 5000.
:INIT; *OPC? # "*OPC?" returns 1 indicating that the measurements have been
taken and are ready to be transferred to the computer using the
FETCH? command.
:FETCH?
Note
For any sample count greater than 1, measurements are returned comma
separated.
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