TB 9-6625-2182-24
(3) Press TI pushbuttons as listed in (a) through (h) below:
INSTR PRESET.
(a)
ENTRY - FREQ.
(b)
DATA - 1 GHz.
(c)
ENTRY - AMPTD.
(d)
DATA - (+10 dBm).
(e)
SHIFT.
(f)
ENTRY - PULSE.
(g)
MODULATION SOURCE - EXT DC.
(h)
(4) Press spectrum analyzer pushbuttons as listed in (a) through (d) below:
Preset.
(a)
AMPLITUDE, Ref Level, 1, 0, dBm.
(b)
FREQUENCY, Center Freq, 1, GHz.
(c)
SPAN, 1, ., 5, MHz.
(d)
(5) Press ENTRY - OFF/ON pushbutton to pulse ON.
(6) Press spectrum analyzer pushbuttons as listed in (a) through (i) below:
BW/Avg, Res BW, 1, 0, 0, kHz.
(a)
Video BW, 1, kHz.
(b)
MARKER.
(c)
SPAN, 0, Hz.
(d)
Sweep, Sweep Time, 3, 0, ms.
(e)
TRIG, Video, 1, 0, dBm.
(f)
(g)
Adjust marker to top of squarewave.
Marker, Delta.
(h)
(i)
Adjust delta marker to bottom of squarewave.
(7) Using spectrum analyzer, measure top to bottom of square wave in dB.
Pulse
envelope on/off ratio will indicate within limits specified in table 11.
Table 11. Pulse Modulation On/Off Ratio
Spectrum analyzer
> dB
40
(8) Press RF OFF/ON to OFF pushbutton.
(9) Disconnect TI EXT REF INPUT (rear panel) from spectrum analyzer.
(10) Disconnect TI OUTPUT RF from spectrum analyzer.
(11) Connect oscilloscope Vertical 1 input to TI OUTPUT RF, using crystal detector.
(12) Adjust pulse generator output for a period of 20 ms and a width of 6 ms.
(13) Press RF OFF/ON to ON pushbutton.
(14) Using oscilloscope measurement techniques, verify that the risetime of displayed
envelope is within limits listed in table 12.
12
