Model 2750 Multimeter/Switch System User’s Manual Range, Digits, Rate, Bandwidth, and Filter 4-13
To set bandwidth, simply specify (approximately) the frequency of the input signal. The
instrument will automatically set the bandwidth as follows:
<NRf> = 3 to 29 3Hz to 300kHz
= 30 to 299 30Hz to 300kHz
= 300 to 300e3 300Hz to 300kHz
NOTE A rate command (:NPLCycles or :APERture) for ACV and ACI is only valid if
the bandwidth for that AC function is set to 300 (300Hz to 300kHz). See “Rate
and bandwidth conflict error” for details.
Rate and bandwidth conflict error
For bandwidth settings of 3 and 30, the normal A/D conversion method is not used for
ACV and ACI measurements. Therefore, integration rate commands (:NPLCycles and
:APERture) for these bandwidth settings will cause a settings conflict error (-221) and not
be executed.
For a bandwidth setting of 300, the normal A/D conversion method is used, therefore the
integration rate commands can be used.
The default bandwidth setting is 30 for both ACV and ACI. If you want to set an integra-
tion rate for an AC function, you will have to first set the bandwidth to 300.
Rate and bandwidth programming examples
Example #1 — The following command sequence sets ACV rate to 5 PLC. In order to set
rate for an AC function, bandwidth must first be set to 300:
VOLT:AC:DET:BAND 300 ' Set ACV bandwidth to 300.
VOLT:AC:NPLC 5 ' Set ACV rate to 5 PLC.
NOTE VOLT:AC:DET:BAND must be set to 300 before the VOLT:AC:NPLC command
can be sent.
Example #2 — The following command sequence configures channels 101 and 103 of the
Model 7700 to set integration rate to 6 PLC when they are scanned.
FUNC 'VOLT' (@101, 103) ' Select DCV function.
VOLT:NPLC 6,(@101, 103) ' Set rate to 6 PLC.
2750-900-01.book Page 13 Wednesday, August 3, 2011 7:56 AM
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