HP 8642A Operating Manual page 207

Model 8 6 4 2 A / B Operation
Operating Messages (cont'd)
NO RELATIVE FREQ SWP E 3 2 4032
Relative values for frequency sweep are not possible. Select only rFREQ~l or HAMPTD J (HP-IB: FR or
AP) before attempting relative settings.
ONLY F R E Q / A M P T D R E L .E33 4 0 3 3
No relative units are possible with the requested setting. Select only fFREQ I or fAMPTDl (HP-IB: FR or
AP) before attempting relative settings.
AP.REF DISALLOWS DBUV E 3 4 4034
An amplitude reference cannot be set in dBuV. Set amplitude to the desired value in dBuV, then select
I REL ZERO 1 (HP-IB: APRZ).
AP.SWP DISALLOWS DBUV ,E35 4035
An amplitude sweep cannot be directly set in dBuV. Convert the desired dBuV setting value to absolute
units, then set the amplitude sweep in absolute units. (Refer to page 3 - 2 0 5 for amplitude units
conversion information.)
FM COUPLED FUNC LIMIT .E38 4038
FM is coupled with an attempted setting. You are either attempting a setting that is impossible or
attempting to set functions in an incorrect order. This message could also have been caused by executing
Special Function 0 or 100 when one special function was coupled to other instrument settings. Possibly
refer to the Sequence Dependency discussion that begins on page 3-12 in the HP-IB portion of this
Section III.
INT+EXT.FM P R E V E N T SP6 ,E39 4039
Special Function 6 (FM Pre-Emphasis) cannot be selected when an internal source is summed with an
external source. Select a single FM source ( I INT 1. 1 EXT AC 1. I EXT DC ), or Special Function 5; HP-IB:
FMNT, FMXA, FMXD, or SP5) before selecting FM Pre-Emphasis, or refer to the Sequence Dependency
discussion that begins on page 3 - 12 in the HP-IB portion of this Section III.
PM LIMITS MIN FREQ E40 4040
The 4>M setting limits the minimum RF frequency value that can be selected. Either reduce $ M
deviation, or select an RF frequency that allows the $M deviation, or refer to the Sequence Dependency
discussion that begins on page 3 - 1 2 in the HP-IB portion of this Section III.
PM LIMITS MAX FREQ E 4 1 4041
The $M setting limits the maximum RF frequency value that can be selected. Either reduce <I>M
deviation, or select an RF frequency that allows the $ M deviation, or refer to the Sequence Dependency
discussion that begins on page 3-12 in the HP-IB portion of this Section III.
FREQ LIMITS MAX PM E42 4042
The RF frequency setting limits the maximum value of $M deviation that can be selected. Set the RF
frequency to a value in a band that allows the desired value of $ M deviation, or select a •I'M deviation
that is allowed ot the current RF frequency, or refer to the Sequence Dependency discussion that begins
on page 3-12 in the HP-IB portion of this Section III.
FR.SWP+AUTO LIMITATION E45 4045
Stepped Frequency Sweep cannot sweep in the Auto sweep mode under the following conditions:
Setting start and stop end-points if one end-point is less than 4.130860 MHz with a second end-point
greater than 132.187 500 MHz.
Setting a Stepped Frequency Sweep across 1057.500000 MHz (in the 8642B).
If neither of these restrictions apply to the attempted setting, refer to the Sequence Dependency discussion
that begins on page 3 - 12 in the HP-IB portion of this Section III.
3-1S7