5-22 Rel, Math, Ratio, Channel Average, dB Model 2750 Multimeter/Switch System User’s Manual
Programming examples — dB
Example #1 — The following command sequence configures the Model 2750 to perform
DCV dB measurements. A 1V input will be measured as 0dB.
FUNC 'VOLT' ' Select DCV function.
UNIT:VOLT DB ' Select DCV dB.
UNIT:VOLT:DB:REF 1 ' Set dB reference to 1V.
Example #2 — The following command sequence configures channels 101 and 105 of the
Model 7700 to perform ACV dB measurements when they are scanned. A 10V input will
be measured as 0dB.
FUNC 'VOLT:AC' ' Set 101 and 105 for ACV.
UNIT:VOLT:AC DB ' Set 101 and 105 for dB.
UNIT:VOLT:AC:DB:REF 1 ' Set 101 and 105 for 10VAC dB
' reference.
Table 5-4
dB commands
Commands
*
Description Def
DCV dB commands
UNITs:VOLTage[:DC] <name> Select DCV measurements; <name> = V or
DB.
V
UNITs:VOLTage[:DC]:DB:REFerence <n> Set reference in volts; <n> = 1e-7 to 1000. 1
ACV dB commands
UNITs:VOLTage:AC <name> Select ACV measurements; <name> = V or
DB.
V
UNITs:VOLTage:AC:DB:REFerence <n> Set reference in volts; <n> = 1e-7 to 1000. 1
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
*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 rel (reference) command. If not, a conflict error (-221) will occur. For example, UNITs:VOLTage:AC dB, (@101)
is only valid if scan channel 101 is set for the ACV function.
2750-900-01.book Page 22 Wednesday, August 3, 2011 7:56 AM
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