Operating instructions

OPERATING MANUAL 2945A
46882-311D 5-41
Results table 5-28 Oscilloscope
LF generator
frequency
UUT
timebase
DVM
lower limit
DVM
upper limit
Result
10 Hz 50 ms/div 2.015 V 2.227 V _______
10 kHz
50 µs/div
2.015 V 2.227 V _______
20 kHz
50 µs/div
2.015 V 2.227 V _______
Results table 5-29 Distortion & SINAD meter
Distortion/SINAD
set
Lower
limit
Upper
limit
Result
2% 1.4% 2.6 % _______
25% 23.2% 26.8 % _______
12 dB 11.0 dB 13 0 dB _______
Results table 5-30 FM measurement versus carrier frequency (1 kHz rate)
Carrier
frequency
(MHz)
Deviation
(kHz)
IF filter
(kHz)
AF filter Lower
limit (kHz) †
Upper
limit (kHz) †
Result
5.5 20 30 0.3 to 3.4 18.8 21.2 _______
500 20 30 0.3 to 3.4 18.8 21.2 _______
1000 20 30 0.3 to 3.4 18.8 21.2 _______
Results table 5-31 FM measurement versus modulation rate
Modulation
rate
AF filter Deviation
(kHz)
Lower
limit (kHz) †
Upper
limit (kHz) †
Result
50 Hz 300 Hz LP 20 18.4 21.6 _______
5 kHz 15 kHz LP 20 18.4 21.6 _______
10 kHz 50 kHz LP 20 18.4 21.6 _______
Results table 5-32 FM measurement versus deviation level (1 kHz rate)
Deviation
level
IF bandwidth Lower
limit (kHz) †
Upper
limit (kHz) †
Result
250 Hz ‡ 3 kHz 0.2275 0.2725 _______
10 kHz 30 kHz 9.4 10.6 _______
50 kHz 300 kHz 47 53 _______
75 kHz 300 kHz 70.5 79.5 _______
† The upper and lower limits in Results table 5-30, Results table 5-31, and Results table 5-32 are
calculated on the assumption that it was possible to set the exact level on the external Modulation
meter. If it is not possible to achieve this, the limits will need to be calculated for the readings
obtained.
‡ For the lower deviation in Results table 5-32, subtract the residual FM reading from the measured
result.