Wavetek 3000 - Percent AM Accuracy Test

METHOD
4 . Set the
Signal Generator
MODULATION FREQ control to
1 kHz .
5 .

The counter
should read between
950
and
1050
Hz .

Record
the counter reading on
line 28 of the PTR .
4 .11 PERCENT
AMACCURACY TEST
SPECIFICATION
Accuracy

±(5% of reading +5I)
at a frequency of 1 kHz
This specificationapplies for output limits
:S-+3 dBm .

AM
is possible above +3 dBm if the peak of the modulated output
does not exceed +13 dBm .
The%AM accuracy is measuredwith a modulation meter after the
front-panel modulation FM/AM control error, which is t4%,
is subtracted out . The FM/AM control accuracy, which consists
of the controllinearity andthe modulation
scale
errors
is measured in terms of the DC voltage at the rear panel
modulation test point .

The calibration of
the voltage across
the
control
at
maximum
position is checkedinitially .
The remaining %AM accuracy, which
is ±(57 of the reading
+
1%
of
full scale), is
measured
by the modulation meter with
accurately measured
voltage applied
to the Signal Generator
modulation
system
. The
measurement uncertainty
is
2%
of
the reading +17 of full scale .
EQUIPMENT
Modulation Meter

Radiometer AFM2
Digital Multimeter Dana 4300
PROCEDURE

1 .
Set the
Signal
Generator controls as follows :
FREQUENCY selector

520 .000 MHz
MODULATION MODE

CW
MODULATION FREQ

VERNIER
MODULATION FM/AM

0% AM
OUTPUT VERNIER

-3
dBm reading
on OUTPUT
meter
OUTPUT step attenuator

0
dBm
2 .
Connect the equipment as shown in Figure 4-3 .
PFRFORMAMCF
TESTS
NOTE :

Provide
aground connection between the SignalGener-
ator andthe digital multimeter .