Tektronix THM565 Technical Reference

TAS 200 Series Adjustment Procedures
30
Handheld and Benchtop Instruments Basic Service
Use the following procedure to adjust the DC balance.
1. Set up the oscilloscope as follows:
VERTICAL MODE CH1 (CH2)
CH 1 (CH 2) VERTICAL VARIABLE CAL
CH 1 (CH 2) GND In
2. On the oscilloscope Main board, adjust VR101 (VR201) for a minimal trace
shift when switching the front panel CH 1 (CH 2) VOLTS/DIV control
between 5 mV and 10 mV. See Figure 10 for the adjustment locations.
3. Verify that the trace shift is less than ±0.5 divisions for each CH 1 (CH 2)
VOLTS/DIV step between 5 mV and 5 V.
4. On the Main board, adjust VR104 (VR204) for minimal trace shift when
switching the CH 1 (CH 2) VOLTS/DIV control between 2 mV and 10 mV.
See Figure 8 for the adjustment locations.
5. Verify that the trace shift is less than two divisions when switching the
VOLTS/DIV control between 1 mV and 2 mV.
6. Set the VERTICAL MODE to CH2 and repeat steps 2 through 5 for CH 2.
Use the following procedure to adjust the variable DC balance.
1. Set up the oscilloscope as follows:
VERTICAL MODE CH1 (CH2)
CH 1 (CH 2) VOLTS/DIV 10 mV
CH 1 (CH 2) VARIABLE CAL
CH 1 (CH 2) GND In
2. On the Main board, adjust VR106 (VR206) for a minimal trace shift while
rotating the front panel CH 1 (CH 2) VARIABLE control between the
fully clockwise and the fully counterclockwise positions. See Figure 8 for
the adjustment locations.
3. Set the VERTICAL MODE to CH2 and repeat step 2 for CH 2.
Use the following procedure to adjust the channel 2 inverted balance and
position center.
1. Set up the oscilloscope as follows:
VERTICAL MODE CH2
CH 2 GND In
2. Position the trace on the center horizontal graticule line using the CH 2
VERTICAL POSITION control.
DC Balance
Variable DC Balance
Channel 2 Inverted
Balance and Position
Center

Tektronix THM565 Specifications

General

Brand	Tektronix
Model	THM565
Category	Multimeter
Language	English