ACCEPTANCE TESTING
6-32
(6) Reset the UUT to
[Carrier Freq.]
10 MHz and set the spectrum analyzer as follows:-
Reference frequency
10 MHz
Reference
level
10
dBm
Span/div
1
kHz
(7) Using the peak find facility on the spectrum analyzer, record the level at each of the
frequencies. Record this figure in Table 6-20, column
3
.
(8) Subtract the figures recorded in step (7) above from the figures recorded in step (5) and record
this difference in Table 6-20, column
4
.
Steps (9) to (15) which follow correlate the RF level accuracy in digital mode to the RF
level accuracy in vector mode.
(10) Enable an IQ self cal as follows:-
[UTIL]
[Mod'n Mode][Vector]
[SIG GEN]
[Carrier Freq.]
10 MHz
[IQ Selfcal]
(10) Connect the test equipment as shown in Fig. 6-19.
C1666
UUT
RF
OUTPUT
INPUT
OUTPUT
➤
➤
2383/2380
Spectrum Analyzer and Display
Function Generator
I IN/OUT
Fig. 6-19 Level accuracy test set-up
(10) Set the function generator to give 0.5 V DC (into 50 W).
(11) Record the level measured on the spectrum analyzer.
(12) Disconnect the DC voltage from the I IN/OUT socket of the UUT.
(13) Set the UUT to Digital Modulation Mode with Test Tones selected and the I, Q amplitude set
to 0 mV and DC offset to 500 mV as follows:-
[UTIL]
[Digital]
[SIG GEN]
[Mod'n System][Select Mod. Type][Test
Tones][EXIT]
[I Ampli.]
0 mV
[Q Ampli.]
0 mV
[I DC Offset]
500 mV
(10) Measure the level of the signal on the spectrum analyzer and compare this figure with that
recorded in step (12) above. The difference must not be greater than 0.1 dB.
(11) Having correlated the RF level accuracies in both digital and vector modes, the remainder of
the RF level accuracy test is performed in digital mode only.
(12) Set the UUT to [SIG GEN] and record the RF level values on the spectrum analyzer at each
of the frequencies given in Table 6-20 . Record these figures in column
5
.
(13) Add the figures recorded in column
5
with the difference figures recorded in column
4
, and
record the result in column
6
.