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Instrument Changes
Model 8901B
Change
1
adds a few function settings not stored by the Store/Recall feature. Previously, when
the settings were recalled, the functions were set to their current settings instead of the stored
settings. The unstored functions were: (1) manually selected Tuned RF Level filtering (Special
Function 4), (2) power sensor calibration factor table entry when entry is in progress, (3) the last
calibrated power sensor type, (4) the HP-IB SRQ mask, and (5) the HP-Il3 Status Byte.
Change
4
increases RF Power measurement resolution by a factor of 10 to allow the instrument's
power meter to be similar to other power meters. 1 mW now reads 1000.0 pW instead of 1.000
mW.
Change 5 adds Special Functions 23 and 24 which are used with Option Series 030, Selective Power
measurements. New hardware and firmware Change 17 (below) must also be added to implement
this feature. Compatibility with all other measurements is maintained.
4. Software date code: 304.1985 (25514
only)
ROM part numbers:
ROM 1, 08901-80081
ROM 2,08901-80082
ROM 3,08901-80083
Change 7 increases digital averaging to reduce display bounce during noisy SINAD measurements
(Special hnction 5.1).
Change I1 adds Special Function 31 which corrects for the noise floor when using the average
detector in k e d RF Level on the lowest range. Special Function 31.0 disables the noise floor
correction. Special Function 31.1 enables the noise floor correction. Special F'unction 31.2 displays
the noise-floor correction status.
Change 13 adds Special Function 7.4 to increase the display resolution of RF frequency to 0.1 Hz
below 10 MHz and 1
H z
above 10 MHz.
Change 14 improves the repeatability of the Set Reference feature in Tuned RF Level by averaging
several readings when computing the calibration reference.
Change 15 extends the frequency offset mode range to 200 GHz.
Change 16 adds Special Function 47 which displays certain instrument configuration details for
troubleshooting purposes. After keying in 47.0 SPCL the display will be of the form
<New Opt. Series 030><01d Opt. Series 030>
where 1 is yes and 0 is no. The new Option Series 030 refers to instruments with serial prefix
2642A and above; old refers to older versions of the HP 8901B Modulation Analyzer (which shares
the firmware).
Change
1
7 adds hardware identification of certain instrument configuration details needed for
Option Series 030 measurements. (Refer also to Change 16 above.)
Change 18 adds Special F'unctions 49.C to read the Option Series 030 IF RMS Detector.
Change
19
increases the averaging time in Tuned RF Level for instruments when Special Function
32.1 is in effect. (See also Change 12.)
7-2
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