TM 11-6625-2781-14&P-2
Section IV
PERFORMANCE TESTS (cont'd)
4-29. Residual Responses (cont'd)
2. Terminate the RF INPUT jack in 50 ohms.
3. Observe the display as the analyzer scans from 10
to 110 MHz. The average noise level should be less
than -110 dBm and no residual responses should
occur. Figure 4-13 represents a scan with no
residual response, and with the average noise level
indicated.
Residual Responses 10-110 MHz:
<-110 dBm
4. To check the analyzer from 1 MHz to 10 MHz, make
the following control settings:
FREQUENCY ................................ ............. 5 MHz
Figure 4-13. Residual Response Test:
SCAN WIDTH PER DIVISION .................... 1 MHz
10 to 110 MHz CRT Display
SCAN TIME PER DIVISION ............. 2 SECONDS
5. Observe the display for residual responses:
Residual Responses 1-10 MHz:
<-110 dBm
6. To check the analyzer from 200 kHz to 1 MHz, make the following control settings:
FREQUENCY ................................ ................................ ................................ ........ Local Oscillator signal appears at
left hand edge of graticule
SCAN WIDTH PER DIVISION ................................ ................................ ................................ ..................... 0 1 MHz
BANDWIDTH ................................ ................................ ................................ ................................ ................ 0 3 kHz
SCAN TIME PER DIVISION ................................ ................................ ................................ ................. 5 SECONDS
7. Observe the display for residual responses over the last 8 horizontal divisions:
Residual Responses 1-10 MHz:
<-110 dBm
8. To check the analyzer from 20 to 200 kHz, make the following control settings:
RANGE - MHz ................................ ................................ ................................ ................................ ........... 0-11 MHz
FREQUENCY ................................ ................................ ....... Local Oscillator signal appears at left hand of graticule
SCAN WIDTH PER DIVISION ................................ ................................ ................................ ....................... 20 kHz
BANDWIDTH 0 ................................ ................................ ................................ ................................ .............. 01 kHz
BANDWIDTH ................................ ................................ ................................ ................................ ................ 0 1 kHz
SCAN TIME PER DIVISION ................................ ................................ ................................ ................. 5 SECONDS
LOG REF LEVEL ................................ ................................ ................................ ................................ ......... -50 dBm
9. Observe the display for residual responses over the last nine horizontal divisions:
Residual Responses 1-10 MHz:
<-95 dBm
4-19
