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The Questionable
Signal Status Group
The Condition Register
15
14
The Transition Filter
Chapter 9
The Questionable Signal Status Group monitors the quality of various
aspects of the output signal. In the AFG, the Questionable Signal Status
Group monitors the frequency accuracy of the divide-by-n subsystem, and
also error conditions in non-volatile calibration memory.
Divide-by-n frequency accuracy and non-volatile calibration memory errors
are monitored with the following bits in the Condition Register. All other
bits are unused.
13
12
11
10
unused
FREQuency: Bit 5 is set (1) when the frequency generated by the
–
divide-by-n (
programmed frequency by greater than 1%. Otherwise, the bit
remains cleared (0).
CALibration: Bit 8 is set (1) when an error is detected in
–
non-volatile calibration memory.
Reading the Condition Register
The settings of bits 5 and 8 can be determined by reading the Condition
Register with the command:
STATus:QUEStionable:CONDition?
Bit 5 has a corresponding decimal value of 32 and bit 8 has a decimal value
of 256. Reading the Condition Register does not affect the bit settings. The
bits are cleared following a reset (
however, if the error condition persists.
The Transition Filter specifies which type of bit transition in the Condition
Register will set corresponding bits in the Event Register. Transition filter bits
may be set for positive transitions ( 0 to 1), or negative transitions (1 to 0).
The commands used to set the transitions are:
STATus:QUEStionable:NTRansition <
STATus:QUEStionable:PTRansition <
sets the negative transition. For each bit unmasked, a 1 to 0
NTRansition
transition of that bit in the Condition Register sets the associated bit in the
Event Register.
sets the positive transition. For each bit unmasked, a 0 to 1
PTRansition
transition of that bit in the Condition Register sets the associated bit in the
Event Register.
9
8
7
6
CAL
unused
FREQ
[SOURce:]FREQuency2
*RST
). Bit 8 calibration will remain set,
5
4
3
2
unused
) subsystem differs from the
unmask
>
unmask
>
AFG Status
1
0
431
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