Keithley 3700 series Reference Manual page 242

Section 9: Instrument Control Library (ICL)
dmm.linesync
Remarks
Example
dmm.makebuffer
Function
Usage
Remarks
Details
9-98
This attribute is only valid when dmm.func = ―dcvolts‖, ―dccurrent‖, ―twowireohms‖,
―fourwireohms‖, ―temperature‖, ―continuity‖, and ―commonsideohms.‖ All other
functions generate an error and return nil when queried.
Changing functions with
The factory default and dmm.reset function value is dmm.OFF.
Enabling this attribute will synchronize a trigger to the main power line crossings.
To enable line sync on ―fourwireohms‖
dmm.func = "fourwireohms"
dmm.linesync = dmm.ON
Creates a user buffer for storing reading.
mybuffer = dmm.makebuffer(buffersize)
buffersize: Maximum number of readings that can be stored.
These reading buffers can be allocated dynamically. These are created and allocated
with the dmm.makebuffer(buffersize) function, where buffersize is the number of
readings the buffer can store.
These buffers can be deleted by setting buffersize to nil.
Once a buffer is created, the attributes are:

mybuffer.appendmode = 1(ON) or 0(OFF) – default 0

mybuffer.basetimeseconds returns the seconds for reading buffer entry 1
(read-only attribute).

mybuffer.basetimefractional returns the seconds and fractional seconds for
reading buffer entry 1 (read-only attribute).

mybuffer.capacity for overall buffer size

mybuffer.collecttimestamps = 1(ON) or 0(OFF) – default 1

mybuffer.collectchannels = 1(ON) or 0(OFF) – default 1

mybuffer.collectunits = 1(ON) or 0(OFF) – default 1

mybuffer.n for number of readings stored in buffer currently

mybuffer.timestampresolution returns the resolution of the timestamping (read-only
attribute).
The following buffer bits indicate buffer statuses:
dmm.buffer.LIMIT1_LOW_BIT or 1
dmm.buffer.LIMIT1_HIGH_BIT or 2
dmm.buffer.LIMIT2_LOW_BIT or 4
dmm.buffer.LIMIT2_HIGH_BIT or 8
dmm.buffer.MEAS_OVERFLOW_BIT or 64
dmm.buffer.MEAS_CONNECT_QUESTION_BIT or 128
Series 3700 System Switch/Multimeter Reference Manual
dmm.func (on page 9-91) has no effect on this setting.
Document Number: 3700S-901-01 Rev. A / August 2007