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Model 8902A
Operation
HP-IB PROGRAM CODES
When operating the Measuring Receiver via HP-IB, the units for the frequency steps can be either
Hz or kHz.
AUTO TUNING
=
AT
AUTOMATIC OPERATION
=
AU
Display Frequency
=
FR
Display Increment
=
FN
Hz, Input Frequency Entry
=
HZ
MHz, Input Frequency Entry
=
MZ
Ranging Automatic
=
GO
RANGE
HOLD
=
G1
Step U p
(Hz)
=
HU
Step Down (Hz)
=
H D
Step U p (kHz)
=
KU
Step Down (kHz)
=
K D
TRACK MODE off
=
KO
TRACK MODE on
=
K1
COMMENTS
RF
Frequency Stepping.
Using the kHz
fi
and kHz
4
keys, the tuning of the Measuring Receiver can be changed by
a
selectable
frequency step (in kHz). This feature is most often used in conjunction with the frequency error
function. The kHz keys can be used regardless of tune mode, but when pressed, the tuning mode
reverts to manual tuning. If these keys are pressed in an automatic tuning mode, the instrument
will tune tuning to the last successfully tuned frequency plus or minus the frequency step. Once a
frequency step is entered on the keyboard (refer to "PROCEDURE"), pressing either of the kHz
keys alone will change tuning by that step size until a new step frequency is defined. At power-up,
the step size is zero.
HP-I8
R F frequencies can be changed in fundamental-units (Hz) steps via the
HP-IB.
These steps are not
possible from the front panel:
H z
Step U p
=
HU
Hz Step Down
=
H D
Tuning to Signals with Low-Rate, High-Deviation FM.
The instrument will not automatically tune to a signal that has low-rate, high-deviation FM. Use a
manual tune mode to measure such signals.
Tuning to Signals with Narrow-Band FM and
+M.
The automatic tuning, low-noise LO mode is adequate for most common measurements. It should
always be used for measuring narrow-band FM and iPM.
Measuring Flatness as a Function of Carrier Frequency.
Automatic tuning, track mode is usefbl for measuring modulation or peak tuned RF level flatness as
a function of carrier frequency. (Select Peak Tuned RF Level with Special Function 36.)
3-143
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