Sweep Comparator

TB 9-6625-2072-24

22. Sweep Comparator

a. Performance Check

(1) Position controls as listed in (a) through (d) below:

(a) TIME/DIV sweep display switch to MAIN.

(b) MAIN TIME/DIV switch to 1 ms.

(d) Set DELAYED INT/AUTO/ EXT/EXT + 10 switch to AUTO.

(2) Set oscilloscope calibrator for a 1 ms MARKER output. If intensified portion of

sweep displayed on oscilloscope does not start on 2d time marker, perform b (1) below.

(3) Adjust DELAY (DIV) control to 9.00. If intensified portion of sweep does not

start on 10th time marker, perform b (2) below.

(4) Set TIME/DIV sweep display switch to DELAYED. Adjust DIV DELAY

control to 1.00 and continue adjusting control until the leading edge of the displayed trace

is one division from the start of the sweep. If the indication on the DIV DELAY control is

not 1.00 1 minor dial division, perform b (3) below.

(5) Adjust DIV DELAY control to 9.00 and continue adjusting the control until the

leading edge of the displayed trace is one division from the beginning of the trace. If the

DIV DELAY control is not 9.00 8 minor divisions, perform b (4) and (5) below.

b. Adjustments

(1) Adjust R473 (fig. 4) until intensified portion of trace starts on 2d time mark on

2d vertical graticule line (R).

(2) Adjust R469 (fig. 4) until intensified portion of trace starts on 10th time mark on

10th vertical graticule line (R).

NOTE

Interaction exists between R473 (fig. 4) and R469 (fig. 4).

(3) Adjust DIV DELAY control to 1.00 and adjust R473 (fig. 4) to align leading

edge of first marker one division from start of sweep (R).

(4) Set DIV DELAY control to 9.00. Adjust R469 (fig. 4) to align leading edge of

10th marker one division from start of sweep (R).

(5) Repeat a (1) through (4) above.