Fluke 45 - Manual (Page 82)

Operating the Meter Using the Computer Interface
Computer Interface Command Set
5
5-23
Table 5-12. Function Modifier Commands and Queries
Command Description
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
Power, REL, and MN MX 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 5-10A. This value
corresponds to the reference impedance (ohms) indicated.
If <value> is not a value in Table 5-10A, an Execution Error is generated.
Table 5-12A. Reference Impedance Values
Value Ref Impedance Value Ref Impedance
1
2
3
4
5
6
7
8
9
10
11
2
4
8
16
50
75
93
110
124
125
135
12
13
14
15
16
17
18
19
20
21 150
250
300
500
600
800
900
1000
1200
8000
DB
DBCLR
DBPOWER
DBREF <value>
DBREF?
HOLD
HOLDCLR
HOLDTHRESH
<threshold>
HOLDTHRESH?
MAX
Meter returns a <value> shown in Table 5-11A. This value corresponds to the
reference impedance indicated.
Meter enters Touch Hold modifier. (See "HOLD Modifier" in Chapter 3 for more on
Touch Hold.) If HOLD is sent when the meter is already in Touch Hold, a reading is
forced and shown on the display.
Meter exits Touch Hold and restores display to normal operation.
Set HOLD measurement threshold to <threshold>. <threshold> must be "1" (very
stable), "2" (stable), or "3" (noisy). Any other value generates an Execution Error. See
"HOLD Modifier" in Chapter 3.
Meter returns Touch Hold <threshold> (i.e., "1", "2", or "3"). See "HOLD Modifier" in
Chapter 3 for a description of Touch Hold thresholds.
Meter enters MN MX modifier with present reading as maximum value. If already in
MN MX modifier, meter displays maximum value. In MN MX modifier, autoranging is
disabled. See "MN MX Modifier" in Chapter 3.