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8-7
SR850 Service
Press
[AUTO PHASE]
The bottom display should read 0.0°.
7. Press
[INPUT/FILTERS]
<Line Notches> to select Line
[GAIN/TC]
<Sensitivity>
Rotate the knob to select 50 mV full scale
Adjust the Line Notch Depth pot until R (top display) is between 20.0 and 25.0 mV.
Then adjust the Line Notch Freq pot to minimize the reading of R AND until θ (bottom display) is
EITHER 0° or 180° (within 1°).
8. Now adjust the Line Notch Depth pot until R is less than 1.0 mV
9. Press
[INPUT/FILTERS]
<Line Notches> three times to select Out
[GAIN/TC]
<Sensitivity>
Rotate the knob to select 1V full scale
[REF/PHASE]
<Ref. Frequency> Select Reference Frequency
[1] [2] [0] [ENTER] Enter 120 Hz OR
[1] [0] [0] [ENTER] Enter 100 Hz
After the readings are stable, the top display should read 1.00 V (±2%).
Press
[AUTO PHASE]
The bottom display should read 0.0°.
10. Press
[INPUT/FILTERS]
<Line Notches> twice to select 2xLine
[GAIN/TC]
<Sensitivity>
Rotate the knob to select 50 mV full scale
Adjust the 2xLine Notch Depth pot until R (top display) is between 20.0 and 25.0 mV.
Then adjust the 2xLine Notch Freq pot to minimize the reading of R AND until θ (bottom display)
is EITHER 0° or 180° (within 1°).
11. Now adjust the 2xLine Notch Depth pot until R is less than 1.0 mV
12. This completes the notch filter adjustment procedure.
13. Turn the unit OFF. Replace the top lid. The lid slides forward and down to engage the clip at the
center front. Replace the four black screws to secure the lid.