HP 8901B Operation And Calibration Manual page 165

Model 8901B Operation
3-12. BASIC FUNCTIONAL CHECKS OF THE MODULATION ANALYZER
Description
Using a signal generator, an oscilloscope, and a sensor module, the overall operation of the Modulation
Analyzer is verified.
Equipment
Oscilloscope
......................................................................
HP 1740A
Sensor Module
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HP 11722A
Signal Generator..
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HP 8640B Option 001 and 002
The H P 8656B, HP 8662A, HP 8663A, HP 8654A or H P 8654B can also be used if an HP 8640B
Option 001 and 002 is not available. However, with these other signal generators you will need to modify
some tests.
Procedure
Preliminary Check
1. Connect the multi-conductor cable of the sensor module to the SENSOR input connector.
Connect the RF coaxial cable of the sensor module to the INPUT 50R connector (see Figure
3-6). Select INSTR PRESET (Blue Key, AUTOMATIC OPERATION). Observe the front-panel
LED annunciators, display segments and decimal points, and key lights.
A l l
LEDs should light
for approximately 10 seconds at turn on and then all should momentarily turn off.
2. After the turn-on sequence, the instrument should display
"--".
The MHz annunciator, the
FM annunciator under MODULATION OUTPUT, the AUTO TUNING annunciator (under the
TRACK MODE key), and the FREQ key should be lighted.
RF Power Calibration Check
Connect the sensor module input to the RF POWER CALIBRATION OUTPUT connector. (See
Figure 3-6.)
Press the RF POWER key. If the instrument does not display Error 15, proceed with step 6.
If the instrument displays Error 15 (indicating the RF power calibration factors have not been
entered), proceed with step 5.
If
the instrument displays Error 15, enter the RF power calibration factors that are given on the
cover of the sensor module. (Note that a software driven alternative is available. See R F Power
for a program list in BASIC for the HP Series 200 computers.):
a. Enter the reference calibration factor by keying in 37.3 and pressing the SPCL key. Then,
key in the value of the reference calibration factor and press the Blue key then the
%
CAL
FACTOR key (the MHz key).
b. Enter each frequency/calibration factor pair by first keying in 37.3 and pressing the SPCL
key. Next, key in the frequency (in MHz) and press the MHz key. Then, key in the value of
the calibration factor and press the Blue key then the 9% CAL FACTOR key.
NOTE
Error 15 will continue to be displayed until the Modulation Analyzer is
able to interpolate between a frequencylcalibration factor pair from those
pairs entered. (For more information, refer to RF Power Calibration and
RF Power Calibration Factors in the Detailed Operating Instructions in
this section.)
reu.1 OJUL87 3-47