Function Modifier Commands And Queries - Fluke 8845A Programmer's Manual

8845A/8846A
Programmers Manual

Function Modifier Commands and Queries

The commands in Table 22 relate to the function modifiers. A function modifier causes
the Meter to modify the normal operation of a measurement function (or perform an
action on a measurement) before displaying a reading.
Command
AFILT (on/off)
AFILT?
DB
DBCLR
DBPOWER
DBREF <value>
DBREF?
DFILT (on/off)
70
Table 22. Function Modifier Commands and Queries
Activates or deactivates the 3-pole analog filter to improve noise immunity for dc
functions. This filter is only available in DCV, DCI, 2-Wire and 4-Wire resistance. The
default setting is OFF. If an attempt is made to enable the filter in a mode not
permitted, the request is ignored.
Returns the state of the analog filter.
Meter enters decibels modifier. Any reading shown in the primary display is in
decibels.
An Execution Error is generated if the meter is not in a volts ac and/or dc function.
Meter exits the decibels modifier and displays readings in normal units. Also clears
dB and Power modifiers.
Meter enters dB Power modifier if the reference impedance is set to 2, 4, 8, or 16
ohms and a voltage function has been selected. Otherwise, an Execution Error is
generated. In dB Power, readings shown in the primary display are in watts.
Set dB reference impedance to a <value> shown in Table 22A. This value
corresponds to the reference impedance (ohms) indicated.
If <value> is not a value shown in Table 22A, an Execution Error is generated.
Table 22A. Reference Impedance Values
Value Ref Impedance
1 2
2 4
3 8
4 16
5 50
6 75
7 93
8 110
9 124
10 125
11 135
Meter returns a <value> shown in Table 22A. This value corresponds to the
reference impedance indicated.
Activates or deactivates the digital averaging filter to reduce noise for dc functions.
This filter is only available in DCV, DCI, 2-Wire and 4-Wire resistance. The default
setting is ON. If an attempt is made to enable the filter in a mode not permitted, the
request is ignored.
Description
Value Ref Impedance
12 150
13 250
14 300
15 500
16 600
17 800
18 900
19 1000
20 1200
21 8000