Keithley 2601 Reference Manual

6-6 Return to Section Topics 2600S-901-01 Rev. C / January 2008
Section 6: Range, Digits, Speed, Rel, and Filters Series 2600 System SourceMeter® Instruments Reference Manual
Digits
The display resolution of the measured reading depends on the DIGITS setting. This setting is
global, which means the digits setting selects display resolution for all measurement functions.
The DIGITS setting has no effect on the remote reading format. The number of displayed digits
does not affect accuracy or speed. Those parameters are controlled by the SPEED setting (see
“
"Speed"” later in this section).
Setting display resolution
To set display resolution, press the DIGITS key until the desired number of digits is displayed. The
display resolution will cycle through 4.5, 5.5, and 6.5 digits.
NOTE For the Model 2602/2612/2636 dual-channel display mode, the
maximum display resolution is 4.5 digits. For the Model 2602/2612/
2636 single-channel display mode, pressing the DIGITS key for the
channel not being displayed will have no effect, but the unit will
display a message advising you to change to the indicated channel.
Remote digits programming
Digits commands
Table 6-3 summarizes digits commands. See Section 12 for more information.
Table 6-3
Digits commands
Command
1
Description
display.smuX.digits = display.DIGITS_4_5
display.smuX.digits = display.DIGITS_5_5
display.smuX.digits = display.DIGITS_6_5
Set display to 4.5 digits.
Set display to 5.5 digits.
Set display to 6.5 digits.
1. smuX = smua for the Model 2601/2611/2635; smuX = smua (Channel A) or smub (Channel
B) for the Model 2602/2612/2636.
Digits programming example
smua.reset()
--Restore Series 2600 defaults.
display.smua.digits = display.DIGITS_5_5
--Select 5.5 digits.
Speed
The SPEED key is used to set the integration time, or measurement aperture, of the A/D converter
(period of time the input signal is measured). The integration time affects the usable digits, the
amount of reading noise, and the ultimate reading rate of the instrument. The integration time is
specified in parameters based on the Number of Power Line Cycles (NPLC), where 1 PLC for
60Hz is 16.67msec (1/60) and 1 PLC for 50Hz is 20msec (1/50).

Keithley 2601 Specifications

General

Brand	Keithley
Model	2601
Category	Measuring Instruments
Language	English