Keithley 2701, User Manual

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Model 2701 User’s Manual Range, Digits, Rate, Bandwidth, and Filter 4-7
Setting digits
Even though the parameters for the DIGits command are expressed as integers (4 to 7),
you can specify resolution using a real number. For example, to select 3½ digit resolution,
let <n> = 3.5. Internally the instrument rounds the entered parameter value to the nearest
integer.
As implied by the commands in Table 4-3, each mainframe input function can have its
own unique digits setting.
Digits programming examples
NOTE The following examples can be run from the KE2700 Instrument Driver using
the example named “Digits” in Table G-1 of Appendix G.
Example #1 — The following commands set digits for DCV and ACI:
VOLT:DIG 5.5 ' Set DCV to 5
½
digits.
CURR:AC:DIG 4 ' Set ACI to 3
½
digits.
Example #2 — The following command sequence configures channels 101 through 110 of
the Model 7700 to select 4½ digits when they are scanned.
FUNC 'RES', (@101:110) ' Select
Ω
2 function.
RES:DIG 4.5,(@101:110) ' Set scan channels to 4
½
digits.
Table 4-3
Digits commands
Commands* Description Default
[SENSe[1]] Optional root command.
:VOLTage[:DC]:DIGits <n> [, <clist>] Set # of digits for DCV; <n> = 4 to 7. 7
:VOLTage:AC:DIGits <n> [, <clist>] Set # of digits for ACV; <n> = 4 to 7. 6
:CURRent[:DC]:DIGits <n> [, <clist>] Set # of digits for DC1; <n> = 4 to 7. 7
:CURRent:AC:DIGits <n> [, <clist>] Set # of digits for ACI; <n> = 4 to 7. 6
:RESistance:DIGits <n> [, <clist>] Set # of digits for
Ω
2; <n> = 4 to 7. 7
:FRESistance:DIGits <n> [, <clist>] Set # of digits for
Ω
4; <n> = 4 to 7. 7
:TEMPerature:DIGits <n> [, <clist>] Set # of digits for TEMP; <n> = 4 to 7. 6
:FREQuency:DIGits <n> [, <clist>] Set # of digits for FREQ; <n> = 4 to 7. 7
:PERiod:DIGits <n> [, <clist>] Set # of digits for PERIOD; <n> = 4 to 7. 7
Channel list parameter:
<clist> = (@SCH)
where: S = Mainframe slot number (1 or 2)
CH = Switching module channel number (must be 2 digits)
Examples: (@101) = Slot 1, Channel 1
(@101, 203) = Slot 1, Channel 1 and Slot 2, Channel 3
(@101:110) = Slot 1, Channels 1 through 10
* The <clist> parameter is used to configure one or more channels for a scan. Each channel in the <clist> must be set to the function
specified by the digits command. If not, a conflict error (-221) will occur. For example, VOLTage:AC:DIGits 4.5, (@101) is only
valid if scan channel 101 is set for the ACV function.
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