Keithley 2750, User Manual

Page: 150 / 452

Model 2750 Multimeter/Switch System User’s Manual Range, Digits, Rate, Bandwidth, and Filter 4-5
Manual ranging
The range is selected by specifying the expected reading as an absolute value using the
<n> parameter for the appropriate :RANGe command. The Model 2750 will then go to the
most sensitive range for that expected reading. For example, if you expect a reading of
approximately 3V, let the parameter (<n>) equal 3 to select the 10V range.
Auto ranging
The :RANGe:AUTO command is coupled to the command to select range manually
(:RANGe <n>). When auto range is enabled, the parameter value for :RANGe <n>
changes to the automatically selected range value. When auto range is disabled, the instru-
ment remains at the selected range. When a valid :RANGe <n> command is sent, auto
ranging disables.
Range programming examples
Example #1
— The following commands select range for DCV,
Ω
2, and DCI:
VOLT:RANG 0.5 ' Select 1V range for DCV.
RES:RANG 2e3 ' Select 10k
Ω
range for
Ω
2.
CURR:RANG 0.1 ' Select 100mA range for DCI.
Example #2
— The following command sequence configures channel 101 of the
Model 7700 to select the 10VDC range when it is scanned.
FUNC 'VOLT',(@101) ' Set 101 for DCV function.
VOLT:RANG 1.5,(@101) ' Set 101 for 10V range.
Digits
The DIGITS key sets display resolution for the Model 2750 from 3
H
to 6
H
digits. From the
front panel, setting digits for one function affects all the other functions. For example if
you set DCV for 3
H
digits, the other functions will also set to 3
H
digits. For remote pro-
gramming, each mainframe input function can have its own unique digits setting.
Digits has no effect on the remote reading format. The number of displayed digits does not
affect accuracy or speed. Speed is set by the RATE key.
Setting display resolution
— To set display resolution, press the DIGITS key until the
desired number of digits is displayed.
Scanning
When a simple scan is configured, the present digits setting will apply to all channels in
the scan. When an advanced scan is configured, each channel can have its own unique dig-
its setting. Details to configure and run a scan are provided in
Section 7 .
For remote programming, the <clist> parameter is used to configure channels for a scan.
2750-900-01.book Page 5 Wednesday, August 3, 2011 7:56 AM