MP12

Measurements

Typical values measured with an HP8903A Audio Analyser and a Fluke 187 multimeter. Configuration : - Cinemag CMMI-8-PCA input transformer, 1:8 ratio - Cinemag CMOQ-2S output transformer, 1:2 ratio - SK99A DOA - Direct coupling with servo - Board supply ±27V, DOA supply ±24V
Measurement	Conditions	Value
Iddle supply current	No input signal	V+ : +50mA V- : -50mA
Input impedance	Input pad Off f=1kHz	1.2kΩ
Input impedance	Input pad On f=1kHz	1.2kΩ
Maximum input level	Input pad Off f=1kHz	+1.2dBu
Maximum input level	Input pad On f=1kHz	+20dBu
Maximum output level before clip	Output pad Off f=1kHz	+29dBu
Minimum gain	Input pad Off	+28dB
Minimum gain	Input pad On	+8.5dB
Maximum gain		+69.3dB
Maximum output pad attenuation		-18dB
EIN	Zin=150Ω Bandwidth=0-30kHz	-127dBu
EIN	Zin=0Ω Bandwidth=0-30kHz	-130dBu
Frequency response	Gain=+40dB Zin=150Ω Deviation=-1dB	7Hz-46kHz
THD	f=1kHz Gain=+40dB Vout=+24dBu	< 0.003%
CMRR	f=100Hz	-110dB
CMRR	f=10kHz	-71dB

Signal injected into input XLR, scope on output XLR, going through both transformers.


Small amplitude square wave output f = 1kHz gain = minimum (+28dB) scale = 0.2V/div	Large amplitude square wave output f = 1kHz gain = +40dB scale = 5V/div	Large amplitude square wave output f = 10kHz gain = +40dB scale = 5V/div