User`s manual

The Questionable
Signal Status Group
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.
The Condition Register 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.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
unused CAL unused FREQ unused
– FREQuency: Bit 5 is set (1) when the frequency generated by the
divide-by-n (
[SOURce:]FREQuency2) subsystem differs from the
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 (
*RST). Bit 8 calibration will remain set,
however, if the error condition persists.
The Transition Filter 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 <unmask>
STATus:QUEStionable:PTRansition <
unmask>
NTRansition
sets the negative transition. For each bit unmasked, a 1 to 0
transition of that bit in the Condition Register sets the associated bit in the
Event Register.
PTRansition sets the positive transition. For each bit unmasked, a 0 to 1
transition of that bit in the Condition Register sets the associated bit in the
Event Register.
Chapter 9 AFG Status 431