Keithley 2750, User Manual

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6-10 Buffer Model 2750 Multimeter/Switch System User’s Manual
a. SYSTem:TIME <hr, min, sec> Set clock time
Use to set the clock time in the 24-hour format (hr/min/sec). Seconds can be set to 0.01 sec
resolution. Examples:
SYST:TIME 13, 23, 36 ' Set time to 1:23:36 PM.
SYST:TIME 3, 25, 28.5 ' Set time to 3:25:28.5 AM.
The SYSTem:TIME? command can be used to read the time. Note that it returns the actual
clock time and not the time parameter specified by the TIME command.
b. SYSTem:DATE <yr, mo, day> Set clock date
Use to set the clock date in the year/month/day format. When setting the year, a 4-digit value
must be used. Example:
SYSTem:DATE 1999, 11, 10 ' Set clock date to November 11, 1999.
c. SYSTem:TSTamp:TYPE RELative | RTClock Select timestamp
SYSTem:TSTamp:TYPE? Query timestamp type; next storage
TRACe:TSTamp:TYPE? Query timestamp type; readings in
buffer
SYSTem:TSTamp:TYPE <name> — Used to select the relative timestamp or the real-time
timestamp. Note that changing the timestamp will clear the buffer if a storage is in process.
If no storage is in process, changing the timestamp will not clear the buffer.
SYSTem:TSTamp:TYPE? and TRACe:TSTamp:TYPE? — Both of these commands query
the timestamp type. However, SYSTem:TSTamp:TYPE? queries the timestamp that will be
used for the next storage operation, while TRACe:TSTamp:TYPE? queries the timestamp
for readings that are presently stored in the buffer.
d. TRACe:CLEar Clear the buffer
TRACe:CLEar:AUTO ON | OFF Control (on/off) buffer auto-clear
TRACe:CLEar — Used to clear the buffer. Buffer readings are not lost (cleared) when the
Model 2750 is turned off.
When TRAC:CLE is sent while displaying stored readings, the message “BUF CLEARED”
is briefly displayed, and the instrument returns to the normal measurement state.
TRACe:CLEar:AUTO — With auto-clear enabled, the buffer will automatically clear when
the storage process starts. When disabled, readings will append to old readings in the buffer
until the buffer becomes full (110,000 readings) or the storage process is stopped. Disabling
auto-clear automatically sets the buffer size to 110,000.
e. TRACe:FREE? Query status of storage memory
Returns two values separated by commas. The first value indicates, in bytes, memory avail-
able for storage, while the second value indicates the number of bytes being used for stored
readings.
2750-900-01.book Page 10 Wednesday, August 3, 2011 7:56 AM