User`s guide

Operating the Power System 4

Series N6700 User’s Guide 91

External Data Logging

NOTE

The external data log function is only available on mainframes with firmware

revision D.01.09 and up. It cannot be programmed from the front panel.

The power system has an external data logger (ELOG) function that

lets you log voltage and current measurements from all four outputs

directly to an internal FIFO (first-in, first-out) buffer. Note that this

buffer is only large enough to hold about 20 seconds of accumulated

measurements. The following table lists this, along with some other

restrictions that apply to the external data logger.

Function

External Data Logger

Data viewing No front panel view or front panel control. Data must be exported to a

spreadsheet.

Data storage Buffers measurements for about 20 seconds and requires that the computer

periodically reads measurements to prevent the internal buffer from

overflowing. The computer needs to provide the data storage function.

Measurement

resources

Run independently on each output. Some outputs can be running an external

data log, while the remaining outputs can be used in front panel control or

used for other SCPI functions.

Measurement

functions

If a power module has only one measurement converter, then either voltage

or current, but not both, can be logged.

Logging rate Up to 102.4 microseconds for one parameter with data format set to real.

Briefly, to make external data log measurements:

 Select the measurement functions and ranges.

 Specify the measurement integration period.

 Select the trigger source.

 Trigger the data logger.

 Retrieve the data log measurement.

The external data logger function cannot be programmed from the

front panel.

Select the Measurement Functions and Ranges

The following commands select a measurement function:

Front Panel: SCPI Command:

Not Available To enable voltage or current measurements:

SENS:ELOG:FUNC:VOLT ON,(@1)

SENS:ELOG:FUNC:CURR ON,(@1)

To enable min/max measurements:

SENS:ELOG:FUNC:VOLT:MINM ON,(@1)

SENS:ELOG:FUNC:CURR:MINM ON,(@1)