ACCEPTANCE TESTING
6-43
IF output
Specification
Output level
Nominally -10 dBm
Test equipment
Description Minimum
specification Example
Spectrum analyzer
200 MHz frequency coverage
Aeroflex 2383
(1) Connect the test equipment as shown in Fig. 6-27.
C1670
UUT
IF
OUTPUT
(rear panel)
INPUT
2383/2380
Spectrum Analyzer and Display
Fig. 6-27 IF output level test set-up
(2) Set the UUT to Digital Modulation Mode and Test Tones selected with I and Q amplitude of
0 mV and DC offset of 500 mV. Select external mixer to enable the IF OUTPUT as follows:
[RF Level]
0 dBm [UTIL]
[Mod'n. Mode][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
[SIG GEN]
[Config. Select][Int/Ext Mixer]
(3) Set the spectrum analyzer as follows:
Reference frequency
132 MHz
Reference level
0 dBm
Span/div 5
kHz
(4) Select Peak Find on the spectrum analyzer. The marker 1 level should read nominally -
10 dBm.
(5) Set the UUT to IFs of 120, 160 and 176 MHz in turn (using
[IF Freq. Select])
, resetting the
reference frequency of the spectrum analyzer accordingly, ensuring that the marker 1 level is
nominally -10 dBm on each occasion.
Last complete check date
On completion of the adjustment routine or of a calibration check, the date can be recorded. To do
this, unlock the instrument to level 2, select the Calibration Utilities Menu, then press the
[Checks
Complete]
key. This will result in the
Last Complete Check
date being updated to the current date.