HP 34401A, User Manual

Page: 142 / 236

The Questionable Data Register
The questionable data register provides information about the quality
of the multimeter’s measurement results. Overload conditions and
high/low limit test results are reported. Any or all of these conditions
can be reported in the questionable data summary bit through the
enable register. You must write a decimal value using the
STATus:
QUEStionable:ENABle
command to set the enable register mask.
Note : A reading overload condition is always reported in both the
standard event register (bit 3) and the questionable data event register
(bits 0, 1, or 9). However, no error message is recorded in the
multimeter’s error queue.
Bit Definitions – Questionable Data Register
Bit
0 Voltage Overload
1 Current Overload
2 Not Used
3 Not Used
4 Not Used
5 Not Used
6 Not Used
7 Not Used
8 Not Used
9 Ohms Overload
10 Not Used
11 Limit Fail LO
12 Limit Fail HI
13 Not Used
14 Not Used
15 Not Used
Decimal
Value
1
2
4
8
16
32
64
128
256
512
1024
2048
4096
8192
16384
32768
Definition
Range overload on dc volts, ac volts,
frequency, period, diode, or ratio function.
Range overload on dc or ac current function.
Always set to 0.
Always set to 0.
Always set to 0.
Always set to 0.
Always set to 0.
Always set to 0.
Always set to 0.
Range overload on 2-wire or 4-wire ohms.
Always set to 0.
Reading is less than lower limit in limit test.
Reading exceeds upper limit in limit test.
Always set to 0.
Always set to 0.
Always set to 0.
Chapter 4 Remote Interface Reference
The SCPI Status Model
142