TB 9-4931-506-24
(7) Press and release stepper circuit switch until multimeter indicates
approximately 0.00 mV (millivolt) dc. Adjust POSITION control until multimeter
indicates 0.00 within 0.05 mV dc.
(8) Press and release stepper circuit switch until TI mV dc ranges listed in table 6
are checked. Multimeter will indicate within specified limits.
Table 6. Gain Accuracy
Test instrument
Digital voltmeter indications (mV dc)
millivolt range
Min
Max
+50.00
+49.85
+50.15
+100.00
+99.70
+100.30
+150.00
+149.55
+150.45
+200.00
+199.40
+200.60
+250.00
+249.25
+250.75
-50.00
-49.85
-50.15
-100.00
-99.70
-100.30
-150.00
-149.55
-150.45
-200.00
-199.40
-200.60
-250.00
-249.25
-250.75
(9) Set oscilloscope POWER switch to off.
(10) Remove stepper circuit switch and reinstall U180 (fig. 1).
b. Adjustments. No adjustments can be made.
12. Step Response Aberrations and Rise-time
a. Performance Check
(1) Remove extender and install test extender between TI and oscilloscope
left compartment.
(2) Remove time base unit and install sampling unit in oscilloscope center and right
compartments. Pull oscilloscope POWER switch to on.
(3) Position TI controls as listed in (a) through (c) below:
(a) TEST switch to VERT OR HORIZ + STEP RESP.
(b) 1 MHz REP RATE pushbutton pressed.
(c) POSITION control to midrange.
(4) Connect TRIG OUT to sampling unit EXT INPUT.
(5) Connect sampling unit CH1 input to + PELTOLA CONNECTOR (fig. 1).
(6) Position sampling unit controls as listed in (a) through (j) below:
(a) CH1 VOLTS/DIV switch to 50 mV.
(b) DELAYING SWP and DELAYED SWP SEC/DIV switches to 0.2 s.
(c) All CAL controls fully ccw.
(d) DELAY ZERO (1st DOT) control fully ccw.