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166 Agilent N518xA, E8663B, E44x8C, and E82x7D Signal Generators Programming Guide
Programming the Status Register System
Status Groups
Data Questionable Condition Register
The Data Questionable Condition Register continuously monitors the hardware and firmware status of
the signal generator. Condition registers are read only.
Table 4-7 Data Questionable Condition Register Bits
Bit Description
0, 1, 2 Unused. These bits are always set to 0.
3 Power (summary). This is a summary bit taken from the QUEStionable:POWer register. A 1 in this bit position
indicates that one of the following may have happened: The ALC (Automatic Leveling Control) is unable to
maintain a leveled RF output power (i.e., ALC is UNLEVELED), the reverse power protection circuit has been
tripped. See the “Data Questionable Power Status Group” on page 168 for more information.
4 N5181A/82A/83A: ALC Heater Detector (COLD). A 1 in this bit position indicates that the ALC detector is
cold.
E4428C/38C, E8257D/67D, and E8663B: Temperature (OVEN COLD). A 1 in this bit position indicates that
the internal reference oscillator (reference oven) is cold.
5
Frequency (summary). This is a summary bit taken from the QUEStionable:FREQuency register. A 1 in this bit
position indicates that one of the following may have happened: synthesizer PLL unlocked, 10 MHz reference
VCO PLL unlocked, 1 GHz reference unlocked, sampler, YO loop unlocked or baseband 1 unlocked. For more
information, see the “Data Questionable Frequency Status Group” on page 171.
6 Unused. This bit is always set to 0.
7 Modulation (summary). This is a summary bit taken from the QUEStionable:MODulation register. A 1 in this
bit position indicates that one of the following may have happened: modulation source 1 underrange,
modulation source 1 overrange, modulation source 2 underrange, modulation source 2 overrange, or modulation
uncalibrated. See the “Data Questionable Modulation Status Group” on page 174 for more information.
8
ab
a.In the N5182A, this bit applies only to the I/Q calibration. In the N5181A/83A, this bit is unused and always set to 0.
b.In the E8257D, and the E8663B this bit applies only to the DCFM/DCΦM calibration.
Calibration (summary). This is a summary bit taken from the QUEStionable:CALibration register. A 1 in this
bit position indicates that one of the following may have happened: an error has occurred in the DCFM/DCΦM
zero calibration, or an error has occurred in the I/Q calibration. See the “Data Questionable Calibration Status
Group” on page 177 for more information.
9 Self Test. A 1 in this bit position indicates that a self-test has failed during power-up. Reset this bit by cycling
the signal generator’s line power. *CLS will not clear this bit.
10, 11 Unused. These bits are always set to 0.
12
c
c.In the N5181A, N5182A, N5183A, E4428C, E8257D, E8267D, and the E8663B this bit is always set to 0.
BERT (summary). This is a summary bit taken from the QUEStionable:BERT register. A 1 in this bit position
indicates that one of the following occurred: no BCH/TCH synchronization, no data change, no clock input,
PRBS not synchronized, demod/DSP unlocked, or demod unleveled. See the “Data Questionable BERT Status
Group” on page 180 for more information.
13, 14 Unused. These bits are always set to 0.
15 Always 0.
Query: STATus:QUEStionable:CONDition?