Figure 2. Test instrument

Calibration Procedure For Function/Pulse Generator, Model 145 Page Navigation
6

TB 9-6625-2088-24

(9) Measure symmetry of square wave. If T1 is not within 0.5 percent of T2 (fig. 1),

perform b (5) below.

b. Adjustments

(1) Adjust R12 (fig. 2) for minimum shift.

(2) Adjust R13 (fig. 2) for greater than 5 ms.

(3) Adjust R16 (fig. 2) for best symmetry 0.5 percent. (R)

(4) Repeat a (6) and (7) above due to interaction.

(5) Adjust R35 (fig. 2) for best symmetry 0.5 percent. (R)

10. Risetime

a. Performance Check

(1) Adjust ATTENUATION VERNIER control fully ccw and set FREQ/PERIOD

MULTI (Hz/s) switch to 1 M.

(2) Connect oscilloscope to FUNCTION OUT, using X10 attenuator.

(3) Adjust ATTENUATION VERNIER control fully cw.

Figure 2. Test instrument - bottom view.

(4) Measure risetime and falltime. Risetime and falltime will be less than 20 ns.

b. Adjustments. No adjustments can be made.