Programming For Math Operations - Fluke 8845A Manual

INPut:IMPedance:AUTO(?) <n>
Description Activates or deactivates (default) the automatic input impedance mode for
dc voltage measurements. With AUTO OFF, the input impedance is fixed
at 10 MΩ for all ranges. With AUTO ON, the input impedance is set to
>10 GΩ for the 100 mV, 1 V, and 10 V ranges. This setting is stored in
volatile memory.
Parameters <n>
Examples IMP:AUTO ON
Query IMP:AUTO?
ROUTe:TERMinals?
Description A query that returns the state of the front or rear panel input terminals
switch.
Examples ROUT:TERM?

Programming for Math Operations

Of the five possible Meter math functions, only one can be enabled at a time. Once a
math function is selected, it stays selected until the Meter is powered down, or another
math function is set. A reset command received through the remote interface will also
disable the math function. Presetting some math registers are possible.
Table 19 is a matrix indicating which math functions work with each Meter function.
Selecting a math function that is not allowed with a Meter function causes math to be
disabled. Selecting a math function that is not allowed after selecting an allowed math
function will result in a "Setting Conflict" error.
Math must be enabled before writing to the zero (null) or dB measurement
registers.
Table 19. Allowed Math/Measurement Function Combinations
DCV ACV
Null Yes Yes
Average Yes Yes
dB No Yes
dBm No Yes
Limit Yes Yes
= OFF or 0
ON or 1
Note
DCI ACI 2W 4W
Yes Yes Yes Yes
Yes Yes Yes Yes
No No No No
No No No No
Yes Yes Yes Yes
Turns off automatic input impedance.
Turns on automatic input impedance.
Turns on automatic input impedance.
Returns the state of the input impedance mode.
(0 = OFF and 1 = ON)
Returns "FRON" or "REAR".
Freq Period Cont
Yes Yes No
Yes Yes No
No No No
No No No
Yes Yes No
Remote Operation
Supported SCPI Commands
Diode Temp Cap
No Yes Yes
No Yes Yes
No No No
No No No
No Yes Yes
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