Keithley 2750 User Manual

6-4 Buffer Model 2750 Multimeter/Switch System User’s Manual
NOTE With auto clear disabled and the relative timestamp selected, every stored read-
ing is referenced to the first reading (#0), even if the buffer is stopped and
started again. For example, assume you stored 10 readings in the buffer, and one
hour later, you store 10 more readings. The timestamps for all 20 readings are
referenced to the first reading. Therefore, the timestamp for the 11th reading
(#10) is one hour (3600 seconds).
When the Model 2750 is turned off, the relative timestamp resets to 0sec when
the instrument is turned back on. If you have readings stored in the buffer and
auto clear is disabled when the unit is turned off, subsequent stored readings
will be appended to the old group of readings. However, the relative timestamps
for the new readings will be referenced to 0sec.
When recalling stored readings from the front panel, both absolute and delta
time-stamps are provided. For remote operation, the absolute or delta timestamp
is returned with each buffer reading. The TRACe:TSTamp:FORMat command
selects the relative timestamp type (Table 6-1).
Real-time clock timestamp — With the real-time clock selected, each stored reading is
timestamped with the time and date. For the time, the seconds reading has 0.01 sec
resolution.
Configuring timestamp
Setting time and date
For the real-time clock, the time and date is set at the factory. However, you can check and
correct the time and date as follows:
Perform the following steps to set the time:
1. Press SHIFT and then SETUP.
2. Use the
Δ and ∇ keys to display SET TIME and press ENTER. The displayed
clock will be running in the hour/minute/second AM/PM format.
3. Use the edit keys (, ,
Δ , and ∇) to set the hour, minute, and AM/PM (seconds
cannot be set), and press ENTER.
Perform the following steps to set the date:
1. Press SHIFT and then SETUP.
2. Use the
Δ and ∇ keys to display SET DATE and press ENTER to display the date
in the month/day/year format.
3. Use the edit keys (, ,
Δ , and ∇) to set the date (month/day/year), and press
ENTER.
2750-900-01.book Page 4 Wednesday, August 3, 2011 7:56 AM

Keithley 2750 Specifications

General

Interface	GPIB, RS-232, Ethernet
Switching Speed	Up to 500 channels/second
Maximum Voltage	300V
Operating Temperature	0°C to 50°C
Measurement Functions	DCV, ACV, DCI, ACI, 2-wire Resistance, 4-wire Resistance, Frequency, Temperature
Resolution	6.5 digits
Current	1A
Maximum Current	1A