HP 8901B Operation And Calibration Manual

Model 8901B Operation
NOTE
Pre-Display is not turned off if the Audio RMS Detector (08) is on when PO
is selected. In this case, FM De-emphasis will be turned off, but Pre-display
will be left
on. Pre-display is required by the Audio RMS hardware.
0 T2 and T3 (Trigger Immediate and Trigger With Settling). Trigger codes should always appear
at the end of a program string, and the triggered measurement results must be read before any
additional program codes are sent to ensure an accurate measurement. When either of the trigger
codes
T2 or T3 is received by the Modulation Analyzer, a measurement cycle is immediately
initiated.
Programming Examples
Code String Example. Function codes may be sent to the instrument in a continuous string as
shown below. The code string shown will program the instrument
to determine the positive peak
de-emphasized
(75 ps) FM deviation of an input signal at 104.5 MHz. The measurement is triggered
with
T3, Trigger with Settling.
OUTPUT 714;” AU 104.5 MZ M2 D1 P1 P4 T3
Automatic Operation
Frequency (Manual
Tuning)
Units
FM
Peak+ Detector
FM De-emphasis and Pre-display
75 ps FM De-emphasis
Trigger w/Settling
Example Measurement Program. The following example provides you with a sample of how the
previous information might be used to program the
HP 8901B to make a particular measurement. This
example demonstrates measuring AM in the
50 Hz to 15 KHz bandwidth of a 100 MHz carrier using
Trigger Hold and Trigger with Settling.
10 OUTPUT 714; ”IP
Instrument Preset to configure instrument
to a known state.
20 OUTPUT 714; “M1 100 MZ H1 L2 T1”
30 OUTPUT 714; 73
Send code to configure instrument for measurement.
Trigger settled measurement.
40 ENTER 714;A
50 PRINT A
60 END
Read data into variable A.
Print variable A
Reference Tables
Table 3-11, “Modulation Analyzer Function to Code Summary”.
This table lists the instrument-
specific function code for each Modulation Analyzer function described in the
Detailed Operating
Instructions
of this manual.
Table 3-12, “Code to Modulation Analyzer Function Summary”. This table has the same
information as Table
3-11, “Modulation Analyzer Function to Code” but is organized alpha-numerically
by code.
3-17

HP 8901B Specifications

General

Brand	HP
Model	8901B
Category	Measuring Instruments
Language	English