Anritsu MS2665C - Page 190

SECTION 6 PERFORMANCE TESTS
6-59
(b) Time span
Step Procedure
1 Press the spectrum analyzer [Preset] key.
2 Operate All Cal.
3 Connect the MG3633A signal generator with the spectrum analyzer shown in the setup
diagram.
4 Set the spectrum analyzer as shown below:
CENTER FREQ ....................................100 MHz
SPAN.........................................................0 MHz
SWEEP TIME ............................................ 20 ms
RBW..........................................................1 MHz
VBW .........................................................1 MHz
5 Set the MG3633A as shown below:
OUTPUT FREQ....................................100 MHz
OUTPUT LEVEL ................................. –16 dBm
MODULATION......................... AM (INT) 90 %
MODULATION FREQ ............................. 1 kHz
6 Press the [→ RLV] key.
7 Set the scale to Linear.
8 Press the [Single] key, then wait until a single sweep execution is completed.
9 Move the marker to the left of the screen using the knob and set the marker on the left most
peak of the sine wave.
10 Setting the marker mode to ∆ (delta), move the current marker to the right using the knob.
Then set the marker to the 18th peak from the left most sine wave peak on the screen.
11 Read the time difference of the ∆ marker, which corresponds to 90 % of the Time Span.
12 Measure at each setting shown in the table below according to step 4 to 11.
Spectrum analyzer Signal Generator AM
∆Marker readout
90 % of specification
time span modulation frequency min/max
20 ms 1 kHz 17.82 ms/18.18 ms
200 ms 100 Hz 178.2 ms/181.8 ms
2 s 10 Hz 1.782 s/1.818 s
20 s 1 Hz 17.82 s/18.18 s
200 s 0.1 Hz 178.2 s/181.1 s