TAS 200 Series Adjustment Procedures
36
Bench Test Instruments and Handheld Oscilloscopes Basic Service
9.
Connect the probe to the square wave generator and confirm that the output
is a 1 kHz square wave. Adjust the generator output to produce a waveform
five divisions in amplitude on the display. Adjust the probe compensation to
flatten and optimize the waveform.
10.
Set the CH 1 (CH 2) VOLTS/DIV control to 0.1 V.
11.
Readjust the generator output to produce a waveform five divisions in
amplitude.
12.
Adjust VC101 (VC201) to flatten the waveform. See Figure 10 for the
adjustment locations.
13.
Set the CH 1 (CH 2) VOLTS/DIV control to 1 V.
14.
Readjust the generator output to produce a waveform five divisions in
amplitude.
15.
Adjust VC103 (VC203) to flatten the waveform. See Figure 10 for the
adjustment locations.
16.
For each setting of the CH 1 (CH 2) VOLTS/DIV control, adjust the
generator output to produce a waveform five divisions in amplitude.
Evaluate the waveform for optimum symmetry and flatness at each setting.
17.
Set the VERTICAL MODE to CH2 and repeat steps 2 through 16 for CH 2.
Use the following procedure to adjust the channel 1 output DC offset.
1.
Set up the oscilloscope as follows:
VERTICAL MODE
BOTH
CH 1 (CH 2) VOLTS/DIV
10 mV
CH 1 (CH 2) VARIABLE
CAL
CH 1 (CH 2) GND
In
TRIGGER SOURCE
CH 1
2.
Position the CH 1 and CH 2 traces to the center horizontal graticule line with
the VERTICAL POSITION controls.
3.
Connect the rear panel CH 1 OUTPUT to the front panel CH 2 input with a
50
Ω
coaxial cable.
4.
Set the CH 2 GND push switch to the out position.
5.
On the Main board, adjust VR112 to position the CH 2 trace to the center
horizontal graticule line. See Figure 8 for the adjustment location.
Channel 1 Output
DC Offset
