Keithley 2750 User Manual page 158

Model 2750 Multimeter/Switch System User's Manual
To set bandwidth, simply specify (approximately) the frequency of the input signal. The
instrument will automatically set the bandwidth as follows:
<NRf>
NOTE
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
VOLT:AC:NPLC 5
NOTE
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)
VOLT:NPLC 6,(@101, 103)
= 3 to 29
= 30 to 299
= 300 to 300e3
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
and bandwidth conflict
VOLT:AC:DET:BAND must be set to 300 before the VOLT:AC:NPLC command
can be sent.
Range, Digits, Rate, Bandwidth, and Filter
3Hz to 300kHz
30Hz to 300kHz
300Hz to 300kHz
error" for details.
' Set ACV bandwidth to 300.
' Set ACV rate to 5 PLC.
' Select DCV function.
' Set rate to 6 PLC.
4-13
"Rate