Keithley 2750, User Manual

Page: 194 / 452

Model 2750 Multimeter/Switch System User’s Manual Buffer 6-5
Selecting timestamp
Perform the following steps to select either the real-time clock timestamp or the relative
timestamp:
NOTE
Changing the timestamp will clear the buffer if a storage is in process. The mes-
sage “BUF CLEARED” will be displayed to indicate the buffer readings were
lost. If no storage is in process, changing the timestamp will not clear the buffer.
1. Press SHIFT and then SETUP.
2. Use the
Δ
and
∇
keys to display “TSTAMP.”
3. Press the key to place the cursor on the presently selected timestamp: REL or
RTCL.
4. Use the
Δ
or
∇
key to display the relative (REL) or real-time clock (RTCL), and
press ENTER.
Storing readings
Perform the following steps to store readings:
1. Set up the Model 2750 for the desired configuration.
2. Press the STORE key.
3. Use the , ,
Δ
, and
∇
keys to specify the number of readings to store in the
buffer (2 to 110000). Pressing the AUTO key sets the readings count to 000000.
NOTE With buffer auto clear disabled, the only valid buffer size values are 110000 and
000000 (which clears the buffer). Any other buffer size value is ignored.
4. Press ENTER. The asterisk (*) annunciator turns on to indicate the buffer is
enabled. It will turn off when the storage is finished.
5. The buffer can be stopped at any time by pressing EXIT.
NOTE Stored readings are not lost when the instrument is turned off. To clear the
buffer, set the reading value to “000000” and press ENTER.
For remote programming, the continuous storage mode can be selected. After
the buffer fills, operation wraps around to the beginning of the buffer (location
#0) and starts to overwrite old reading data (see TRACe:FEED:CONTrol com-
mand in
Table 6-1 ).
2750-900-01.book Page 5 Wednesday, August 3, 2011 7:56 AM