artisan 8640B - Peak Incidental Phase Modulation Test

Model 8640B TM 9-4935-601-14-7&P
PERFORMANCE TESTS
4-35. PEAK INCIDENTAL PHASE MODULATION TEST (Cont'd)
WARNING
This test is performed with power supplied to the instrument while protective covers are
removed. Be careful when performing this test. Line voltage is always present on terminals
including the power input connector, fuse holder, power switch, etc. In addition, when the
instrument is on, energy available at many points may result in personal injury or death when
contacted.
Capacitors inside the instrument may still be charged even if the instrument has been
disconnected from its line power source.
PROCEDURE:
1. Disconnect instrument from the line power source. Remove bottom cover from Signal Generator. Remove semi-rigid
coaxial cable W7 from jack A26W3 labeled RF IN (FROM DIV). Connect one test cable from the tee to A26W3,
connect other test cable, with adapter, from the tee to W7. Connect instrument to line power source. Allow one hour
warm-up time before continuing with this test.
NOTE
See the last foldout sheet in this manual for component identification.
2. Finish connecting equipment as shown in Figure 4-21 after setting Signal Generator's controls as follows:
Meter Function............................................................................................................. .AM
COUNTER MODE: EXPAND...................................................................................... Off
LOCK ........................................................................................................ Off
Source........................................................................................................ INT
AM............................................................................................................................... DC
FM............................................................................................................................... OFF
RANGE .......................................................................................................................256 - 512 MHz
FREQUENCY TUNE ................................................................................................... 512 MHz
OUTPUT LEVEL..................................................................................... -7 dBm (Vernier full cw)
RF ON/OFF................................................................................................................. ON
3. Set function generator for 1 kHz at approximately 500 mVrms and adjust Signal Generator's MODULATION control
for 30% AM as read on Signal Generator's panel meter. Set function generator for 0.1 Hz. (The % AM remains the
same. The low rate is necessary for the vector voltmeter's metering circuitry.)
4. Set Signal Generator's AM switch to OFF. Set vector voltmeter's frequency range to 300 600 MHz. Zero the
voltmeter's phase meter.
5. Set Signal Generator's AM switch to DC. The vector voltmeter's phase meter should indicate less than ±17.2° of
deviation (maximum).
-----------17.2
0
4-55
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