Model 8640B TM 9-4935-601-14-7&P
PERFORMANCE TESTS
4-29. OUTPUT LEAKAGE TEST (Cont'd)
EQUIPMENT:
RF ON/OFF ....................................................................................................ON
One-Inch Loop Antenna .............................................................HP 08640-60501
20 dB Amplifier (0.5 - 400 MHz)...........................................................HP 8447A
20 dB Amplifier (400 - 1200 MHz) ........................................................HP 8447B
Spectrum Analyzer...................................................... . HP 141T/8552B/8554B
50 Ohm Load (6 required)..................................................................HP 11593A
PROCEDURE:
1. Connect equipment as shown in Figure 4-15 (with Signal Generator connected to spectrum analyzer through 0.5
- 400 MHz amplifier) after setting Signal Generator's controls as follows:
Meter Function..........................................................................................LEVEL
COUNTER MODE: EXPAND ..........................................................................Off
LOCK...............................................................................Off
Source............................................................................ INT
AM................................................................................................................OFF
FM ................................................................................................................OFF
RANGE ...........................................................................................64 -128 MHz
FREQUENCY TUNE..............................................................................100 MHz
OUTPUT LEVEL...................................................................................-107 dBm
RF ON/OFF ....................................................................................................ON
2. Set spectrum analyzer's resolution bandwidth to 10 kHz, input attenuation to 0 dB, frequency span per division
(scan width) to 20 MHz, scale to log (10 dB per division), scale reference level controls to -50 dBm, and scale
center frequency controls to 100 MHz. Calibrate the analyzer by using the scale reference level controls to set
the -107 dBm signal from the generator to the -37 dB graticule line on the display. Disconnect generator from
analyzer and connect 50 ohm terminations to generator's output ports (including the Auxiliary RF Output on rear
panel).
3. Connect one-inch loop antenna to analyzer through 0.5 400 MHz amplifier. Hold end of loop antenna cylinder in
contact with all surfaces of Signal Generator; set analyzer's center frequency controls to 300 MHz and repeat.
All signals and noise should be below the -27 dB graticule line on analyzer's display (below -97 dBm) from 0.5 to
400 MHz.
-97 dBm____________
4. Replace 0.5 400 MHz amplifier with 400 1200 MHz amplifier. Set analyzer's center frequency controls to 500
MHz; set generator's RANGE control to 256 512 MHz and FREQUENCY TUNE control to 500 MHz, and connect
generator to analyzer and calibrate analyzer as specified in step 2. Then reterminate RF OUTPUT, reconnect
loop antenna to analyzer and hold end of loop antenna cylinder in contact with all surfaces of generator. All
signals and noise should be below the -27 dB graticule line on analyzer's display (below -97 dBm) from 400 MHz
to 600 MHz.
-97 dBm____________
4-43
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