Frequency Response

TM 11-6625-2781-14&P-2

Section IV

PERFORMANCE TESTS (cont'd)

4-26. Frequency Response

SPECIFICATION:

Flatness (Input attenuation ,20 dB); Log: ±0.5 dB; Linear: ±5.8%.

DESCRIPTION:

A flat signal source is connected to the analyzer RF INPUT. The CRT display is observed for frequency response as the

input signal is tuned. The HP Model 661B is used as a signal source between 1 kHz and 10 MHz and the HP Model

608E/F (output monitored by the HP 8405A) is used between 10 MHz and 110 MHz.

Figure 4-9. Frequency Response Test: 10 MHz to 110 MHz

EQUIPMENT:

Test Oscillator................................ ................................ ................................ ................................ ............. HP 651B

Signal Generator................................ ................................ ................................ ................................ ...... HP 608E/F

RF Voltmeter ................................ ................................ ................................ ................................ ............ HP 8405A

50-ohm Feedthrough Tee................................ ................................ ................................ ........................ HP 11536A

BNC Cable Assembly (2) ................................ ................................ ................................ ........................ HP 10503A

Type N to BNC Adapter (2) ................................ ................................ ................................ ..................... UG 201A/U

1. To check the analyzer frequency response from 10 MHz to 110 MHz, connect the test setup as shown in Figure 4-9

Make the following control settings

ANALYZER:

RANGE MHz ................................ ................................ ................................ ................................ ................... 0-110

FREQUENCY ................................ ................................ ................................ ................................ ............... 60 MHz

BANDWIDTH ................................ ................................ ................................ ................................ ............... 100 kHz

SCAN WIDTH ................................ ................................ ................................ ................................ ....PER DIVISION

SCAN WIDTH PER DIVISION ................................ ................................ ................................ ...................... 10 MHz

INPUT ATTENUATION................................ ................................ ................................ ................................ .... 30 dB

SCAN TIME PER DIVISION ................................ ................................ ................................ ........ 5 MILLISECONDS

LOG/LINEAR ................................ ................................ ................................ ................................ ................ LINEAR

4-13