ACCEPTANCE TESTING
7-17
Internal FM
Specification
Deviation range:
0 to 100 kHz
Resolution:
3 digits or 1 Hz
Bandwidth (1 dB):
DC to 100 kHz (DC coupled)
10 Hz to 100 kHz (AC coupled)
20 Hz to 100 kHz (AC coupled with ALC)
Accuracy:
±
5% at 1 kHz modulation rate.
Carrier error:
Less than 1% of the set frequency deviation when DC coupled
Distortion:
Less than 1% at 1 kHz rate for deviations up to 100 kHz.
(Less than 3% for carrier frequencies less than 50 MHz.)
Typically not greater than 0.3% at 1 kHz rate for deviations up to
10 kHz.
External modulation input:
1 V RMS for set deviation
Modulation ALC:
Levels the applied external modulation over the range 0.75 to 1.25 V
RMS.
FSK:
Accepts logic level inputs (1 or 2) to produce an unfiltered FSK
modulated output
Test equipment
Description Minimum
specification Example
Modulation meter
FM accuracy
±
1% at 1 kHz modulation frequency
IFR 2305 with
Distortion Option
DVM
DC voltage measurement
Solartron 7150+
50
Ω
load
(termination)
1 W, 50
Ω
nominal impedance, DC to 2.4 GHz
Lucas Weinschel
M1404N
Audio analyzer
Capable of measuring THD of 0.01% from 100 Hz
to 20 kHz
Rhode &
Schwarz UPA3
Function
generator
DC to 100 kHz sine,
±
0.6 dB flatness
HP 3325B
