Keithley 2701 User Manual

6-10 Buffer Model 2701 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 10, 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> — Use 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 2701 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 (450,000 readings) or the storage process is
stopped. Disabling auto-clear automatically sets the buffer size to 450,000.
e. TRACe:FREE? Query status of storage memory
Returns two values separated by commas. The first value indicates, in bytes, memory
available for storage, while the second value indicates the number of bytes being used
for stored readings.

Keithley 2701 Specifications

General

Max Voltage	300 V
Max Current	3 A
Frequency Range	3 Hz to 500 kHz
Frequency Accuracy	0.01%
Weight	3.6 kg
Measurement Functions	Frequency, Temperature
Interface	IEEE-488 (GPIB), RS-232
DC Voltage Range	300 V
DC Current Range	3 A
AC Voltage Range	300V
AC Current Range	1 μA to 3 A
Resistance Accuracy	0.01%
Channels	10
Dimensions	213mm x 88mm x 370mm