UREI 1176 Calibration_Calibration Procedures_Analytical Balances-Useful Scales

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UREI 1176 Calibration

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gearmaster 2005-06-29 01:08:25 Publish:

Note: There are no user serviceable parts inside the Universal Audio 1176LN. Unit calibration as well as repair should only be performed only by qualified service personnel. These calibration procedures are provided only for use by qualified service technicians.

Q Bias
The compression threshold is set using R59. Under normal circumstances, this control doesnot need to be adjusted. The threshold is dependent upon the specific characteristics of the VVR FET (Q1), and it will be necessary to re-adjust it if Q1 is changed.

The following procedure is used to set Q bias:

-Select either +4 or +8 output metering

-Adjust R59 fully counterclockwise (CCW)

-Apply a sine wave signal to the limiter

-Use the Input and Output Controls for 0dB output Slowly adjust R59 CW until the output decreases 1.0 dB

Meter Driver Null
A multimeter is needed to perform this calibration procedure.

-Disconnect any input and output connection on the 1176LN

-Set multimeter to measure dc volts

-Depress the Meter GR pushbutton Adjust 0 set potentiometer, R71 (located on the front panel) so that the meter reads near 0 dB

-Connect the multimeter across R74 ! Adjust R75 for a minimum voltage reading ! Disconnect the multimeter

-Readjust 0 set potentiometer, R71 so that the meter reads 0 dB

Urei 1176

posted by GearMaster @ 9:32 AM

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