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Operation
Model 8902A
7. RF Frequency Resolution. Use this special fiinction to manually set the display resolution during
frequency measurements (including RF, IF, and LO frequencies). Note that with finer resolution,
measurement time increases
.
7.0 Automatic selection.
7.1 Resolution of 10 Hz.
7.2 Resolution
of
100
Hz. (When using an external LO value greater than 20 GHz. 7. I
SPCL
7.3 Resolution of 1 kHz.
7.4
selects 100 Hz resolution.)
(Applies to R F Frequency measurements only; other measurements treat 7.4 as 7.1.)
Resolution of 0.1
H z
for input signals less than 10.1 MHz; resolution of
1
Hz for signals
from 10.1 MHz through 1300 MHz. (When measuring frequencies as high as 1300 MHz,
measurement time with this resolution is approximately 20 seconds.)
8.Error Message Disable Control. Most combinations of Errors 01 through 04 can be disabled
o r
enabled to customize the behaviour of the instrument to meet a particular set of measurement
requirements. When the Measuring Receiver uses automatic selection of error messages, these
messages are selectively enabled, depending on the measurement being made, to assure the broadest
range of calibrated measurements. Error Mcssagc Disahk Confro/ on page 3-267 has a table that lists
the
errors
that are automatically disabled during each measurement.
8.0
Automatic selection of disabled error messages.
8.1 Disables Error
0 1.
8.2 Disables Errors 02 and 03.
8.3 Disables Errors 01, 02, and 03.
8.4 Disables Error 04.
8.5 Disables Errors 01 and 04.
8.6
Disables Errors 02, 03, and 04.
8.7 Disables
Errors 01, 02,03, and 04. Performs the same function as DISABLE
ERROR
(Blue
Key, RANGE
HOLD).
8.8 Enables Errors 01, 02, 03, and 04. This ensures that the output from MODULATION
OUTPUT
is safeguarded for most measurements. Some tuned, non-modulation measure-
ment modes (such as frequency) d o not completely safeguard the signal fidelity at this
output since accurate demodulation is not the primary goal of that measurement mode.
9. IF Gain. Use this special function to insert gain into the Measuring Receiver's circuitry. The
amplifier used has precise
10
dB gain steps ranging from 0 t o 60 dB. (Refer to IF Gain on page 3-263
for more information about this function.)
9.0 Automatic Selection of gain for Tuned RF Level measurements.
9.1 Gain of 0 dB inserted.
9.2 Gain of 10 dB inserted.
9.3
Gain of 20 dB inserted.
9.4 Gain of 30 dB inserted.
9.5 Gain
9:'
40 dB inserted.
9.6 Gain of 50 dB inserted.
9.7 Gain of 60 dB inserted.
-
This special function is not available with firmwarc date codcs 234.1985 and below. (To display the firmwarc datc codc. sclcct
42.0 SPCL.) To ordcr a ROM sct that contains this special function. contact the ncarcst HP salcs oficc.
3-277
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