Fluke 45 User Manual page 82

Table 5-12. Function Modifier Commands and Queries
Command
DB 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.
DBCLR Meter exits the decibels modifier and displays readings in normal units. Also clears dB
Power, REL, and MN MX modifiers.
DBPOWER 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
DBREF <value>
corresponds to the reference impedance (ohms) indicated.
If <value> is not a value in Table 5-10A, an Execution Error is generated.
DBREF? Meter returns a <value> shown in Table 5-11A. This value corresponds to the
reference impedance indicated.
HOLD 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.
HOLDCLR Meter exits Touch Hold and restores display to normal operation.
Set HOLD measurement threshold to <threshold>. <threshold> must be "1" (very
HOLDTHRESH
stable), "2" (stable), or "3" (noisy). Any other value generates an Execution Error. See
<threshold>
"HOLD Modifier" in Chapter 3.
Meter returns Touch Hold <threshold> (i.e., "1", "2", or "3"). See "HOLD Modifier" in
HOLDTHRESH?
Chapter 3 for a description of Touch Hold thresholds.
MAX 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.
Operating the Meter Using the Computer Interface
Description
Table 5-12A. 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
Computer Interface Command Set
Value Ref Impedance
12 150
13 250
14 300
15 500
16 600
17 800
18 900
19 1000
20 1200
21 8000
5
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