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
If <value> is not a value in Table
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
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.
