TB 9-6625-2274-50
Table 5. Markers Mode 1 s/D to 0.5 ns/D (con't)
Test instrument
Frequency counter
UNITS/DIV dial
indications
display indications
Min
Max
2
ns/D3
497.488
MHz
502.538
MHz
1
ns/D
0.99005 GHz
1.01015 GHz
.5 ns/D
1.96069 GHz
2.04092 GHz
1Set
frequency counter for period measurement.
2Set
frequency counter for frequency measurement.
3Move counter input connection from A to C.
(6) Press OUTPUT ON pushbutton off and disconnect frequency counter. Connect
TI OUTPUT to oscilloscope CH 1 input using 50 Ω feedthrough termination. Connect
TRIGGER OUTPUT to oscilloscope CH 2 input using 50 Ω feedthrough termination.
(7) Position controls as listed in (a) through (c) below:
(a) TIMING MODE MARKERS pushbutton.
(b) Adjust UNITS/DIV dial to display 5 ms/D.
(c) Press OUTPUT ON pushbutton on.
(8) Acquire signals using oscilloscope and adjust CH 1 and CH 2 amplitude to
500 mV/D.
(9) Oscilloscope will display a marker and trigger amplitude of ≥ l V. Verify
markers (.5 s/D to 5 ns/D only) and triggers (.5 s/D to 100 ns/D only) fall approximately on
oscilloscope vertical graticule lines.
NOTE
Trigger rate checked from 5 s to 100 ns and remains at 100 ns
for faster rates.
(10) Repeat technique of (13) above for UNITS/DIV dial settings from 5 s/D to
5 ns/D.
(11) Press OUTPUT ON pushbutton off. Disconnect setup from oscilloscope and
connect OUTPUT to digitizing oscilloscope INPUT/TDR OUTPUT using XI0 attenuator.
Connect TRIGGER OUTPUT to digitizing oscilloscope TRIG.
(12) Adjust UNITS/DIV dial to display 2 ns/D and press TRIGGER ON and
OUTPUT ON pushbuttons on.
(13) Set digitizing oscilloscope channel 1 probe attenuation to 10. Acquire signal
using digitizing oscilloscope. Adjust digitizing oscilloscope channel 1 sensitivity to
500 mV/D and sweep speed to 2 ns/D. Digitizing oscilloscope will display a marker
amplitude of ≥1 V and falling approximately on vertical graticule lines.
(14) Adjust UNITS/DIV dial to display 1 ns/D.
(15) Acquire signal using digitizing oscilloscope and adjust sensitivity to 350 mV/D
and sweep speed to 1 ns/D.
(16) Digitizing oscilloscope will display a marker amplitude of 1 division or greater
and markers will fall on vertical graticule lines. (Adjust delay if necessary.)
(17) Adjust UNITS/DIV dial to display 5 ns/DIV.
12
