TB 9-6625-2293-24
(7) Adjust DAC REF R2127 (fig 2) to add the (signed) number obtained in (6) above
to the reading in (4) above.
(8) Repeat (3) through (7) above as necessary to obtain a total DAC range of 2.500 V.
(10) Press Δt pushbuttons to off (no cursor on display).
(11) Connect oscilloscope calibrator SOURCE/MEASURE CHAN 1 to TI CH 1
using a 5-80 pF standardizer.
(12) Set oscilloscope calibrator for a CHAN 1, EDGE mode output of 600 mV at
(13) Rotate oscilloscope calibrator knob below EDIT field pushbutton to adjust
waveform to 6 divisions of vertical deflection on TI.
(14) Adjust 5-80 pF standardizer for a square front corner over the first 40 μs
(0.4 division) of the positive portion of waveform. Note waveform front corner for use in (17)
below.
(15) Change oscilloscope calibrator EDGE mode output to 300 mV at 1 kHz.
(16) Set VOLTS/DIV switch to 50 mV and rotate oscilloscope calibrator knob below
EDIT field pushbutton to adjust waveform to 6 divisions of vertical deflection on TI.
(17) Adjust CH1 50 mV C ADJ (C105) and CH2 50 mV C ADJ (C205) for CH 2 (fig 1)
for same waveform front corner as noted in (14) above.
(18) Set VOLTS/DIV switch to 100 mV.
(19) Repeat (13) through (18) above until no change is observed in the waveform
front corner.
(20) Press VERTICAL MODE CH 1 to off and CH 2 to on.
(21) Repeat technique of (11) through (19) above for CH 2.
a. Performance Check
(1) Simultaneously press and hold Δt and ΔV pushbuttons; then press and hold
TRIGGER SLOPE pushbutton. Hold in all three pushbuttons for approximately 1 second
and then release. Top of display will indicate: DIAGNOSTIC. PUSH A/B TRIG TO EXIT.
(2) Push TRIGGER MODE switch up to step to CAL 01 (lower left corner of display).
CAUTION
Upon entering CAL 01, the input coupling is automatically set
to 50 Ω DC and 50 Ω overload protection is disabled. Before
starting procedure, make sure any 50 Ω overload condition has
been cleared.