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STATUS BYTE (#1)
BIT#
7
6
5
4
3
2
1
0
DECIMAL
VALUE
128
64
32
16
8
4
2
1
FUNCTION
SRQ on
New fre¬
quencies
or Sweep
Time in
Effect
REQUEST
SERVICE
(RQS)
SRQ on
HP-IB
Syntax
Error
SRQ on
End of
Sweep
SRQ on RF
Settled
SRQ on
Changed in
Extended
Status
Byte
SRQ on
Numeric
Entry
Completed
(HP-IB or
Front
Panel)
SRQ on
Any Front
Panel Key
Pressed
EXTENDED STATUS BYTE (#2)
BIT#
7
6
5
4
3
2
1
0
DECIMAL
VALUE
128
64
16
8
4
2
1
FUNCTION
Fault
Indicator
On
RF
Unleveled
Power
Failure
RF
Unlocked
External
Freq. Ref.
Selected
Oven Cold
Over
Modulation
Self Test
Failed
Status Byte 1
Bit 0: SRQ caused by a key closure on the front panel of the HP 8340B/41B (use the OM code
to determine the front panel status).
Bit 1: SRQ caused by the completion of a numeric entry (use the OA code to determine the
value of the numerical entry).
Bit 2: SRQ caused by a change in the extended status byte (status byte 2) affected by the RE-
coded mask (see the RE code for an explanation of this masking).
Bit 3: SRQ caused by the completion of phase locking and the settling of the RF source (use
the OK code to determine the last lock frequency).
Bit 4: SRQ on end-of-sweep or mid-sweep update in NA (network analyzer code) mode.
Bit 5: SRQ caused by HP-IB syntax error.
Bit 6: SERVICE REQUEST; by IEEE-488 convention, the instrument needs service from the
controller when this bit is set true.
Bit 7: SRQ caused by a change in the coupled parameters (start frequency, center frequency,
and sweep time). Use the OC code to determine the new values of the coupled parameters.
Status Byte 2 (Extended Status Byte)
Bit 0: Self test failed at power on or at Instrument Preset. This bit remains latched until this
status byte has been read, or until cleared by the CS or CLEAR 719 commands.
Bit 1: Excessive amplitude modulation input.
Bit 2: Oven for the reference crystal oscillator is not at operating temperature.
Bit 3: External reference frequency was selected by the rear-panel FREQUENCY STANDARD
switch.
3-76
Operating Information
HP 8340B/41B
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