4-12 Range, Digits, Rate, Bandwidth, and Filter Model 2750 Multimeter/Switch System User’s Manual
Aperture
Aperture is a different way to specify the integration rate. As previously explained, 1 PLC
sets the integration rate to 16.67msec (assuming 60Hz line power). You can instead use an
APERture command as follows to set the same integration rate:
:APERture 16.67e-3
Bandwidth
There are three bandwidth settings for ACV and ACI measurements: 3 (3Hz to 300kHz),
30 (30Hz to 300kHz), and 300 (300Hz to 300kHz). To achieve the best accuracy for ACV
and ACI measurements, use the bandwidth setting that best reflects the frequency of the
input signal. For example, if the input signal is 40Hz, then a bandwidth setting of 30
should be used.
Commands
1, 7
Description Default
Bandwidth commands
[SENSe[1]] Optional root command.
:VOLTage:AC:DETector:BANDwidth
<NRf> [, <clist>]
Set AC bandwidth for ACV in Hertz; <NRf> =
3 to 3e5.
6
30
:CURRent:AC:DETector:BANDwidth
<NRf> [, <clist>]
Set AC bandwidth for ACI in Hertz;
<NRf> = 3to 3e5.
6
30
Channel list parameter:
<clist> = (@SCH)
where: S = Mainframe slot number (1, 2, 3, 4 or 5)
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
Notes:
1. 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 command. If not, a conflict error (-221) will occur. For example, RESistance:NPLCycles 1, (@101) is only valid if
scan channel 101 is set for the
Ω2 function.
2. For 60Hz line power, x = 60. For 50Hz line power, x = 50.
3. For 60Hz line power, x = 1.67e-4. For 50Hz line power, x = 2e-4.
4. For 60Hz line power, the default is 16.67msec. For 50Hz line power, the default is 20msec.
5. Commands to set rate for ACV and ACI are only valid if bandwidth is set to 300 (300Hz to 300kHz). See “Rate and bandwidth
conflict error,” page 4-13, for details.
6. The instrument will actually accept a parameter value up to 10e6, but it will default to 3e5.
7. [:DC] is optional for the commands to set DCV and DCI integration rate.
Table 4-5 (continued)
Rate and bandwidth commands
2750-900-01.book Page 12 Wednesday, August 3, 2011 7:56 AM
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