Operating the Meter Using the Computer Interface

5

Computer Interface Command Set

Command

DB

DBCLR

DBPOWER

DBREF <value>

Table 5-12. Function Modifier Commands and Queries

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

1

2

3

4

5

6

7

8

9

10

11

Ref Impedance

2

4

8

16

50

75

93

110

124

125

135

Value

12

13

14

15

16

17

18

19

20

21

Ref Impedance

150

250

300

500

600

800

900

1000

1200

8000

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.

5-23

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Fluke 45 user manual Function Modifier Commands and Queries Description, 12A. Reference Impedance Values Ref Impedance

45 specifications

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