Solid State Logic XLOGIC SUPERANALOGUE X-RACK Owner's Manual page 69

H.4.4 Output Balance
Equipment Required:
Test Signal:
Input and Output:
Unit Setup:
Adjustment:
H.4.5 'Balance' Adaptor
For the output balance adjustment, a 'balance'
adaptor such as that illustrated here will be
required. This adaptor consists of a pair of close
tolerance resistors in an in-line cable and is
used to sum together a balanced output in
order to correctly adjust the level balance of the
measured output; perfect balance should result
in complete signal cancellation.
Calibrated audio oscillator, audio level meter and a 'balance' adaptor (see
below)
1kHz sine wave at +24dBu
Oscillator to Line Input and Output to the audio level meter via the
'balance' adaptor
Set the Line Trim to indent (0dB) and select 'LINE'
Adjust VR10 for minimum level (< 55dBr)
From unit
under test
Note
X-Rack VHD Mic Amp Module
1
0V
1
5K01**
2
+
1
5K01**
3
–
1. Resistor tolerance should ideally be 0.01%
2. Absolute level measured will depend upon the input
impedence of the measuring equipment.
3
–
2
To measuring
2
+
equipment
1
0V
Page H-5