廠家: 德國羅德與施瓦茨 ROHDE&SCHWARZ
stereo multiplex input(balanced or unbalanced,selected with shorting link)
Frequency range: 30Hz-75KHz
input impedance(balanced): ≥40KΩ
Common-mode suppression:
at f<150Hz:≥58dB
at 150Hz<f<15KHz:≥46dB
at 15KHz<f<100KHz:≥36dB
input impedance(unbalanced):≥20KΩ
nominal input level(settable in 6-dB steps):-12 to +12dBm(0dBm=0.775v into 600Ω)
continuous input-level adjustment:±3dB
overdrive limit:≥6.5dB
AF OUTPUTS
R,L,M outputs(floating,balanced)
nominal output level:+6dBm
output impedance:≤20Ω
Load impedance:≥200Ω
Level difference between L and R channels:≤0.1dB
S output(not floating,unbalanced)
nominal output level:+6dBm
output impedance:≤500Ω
Linear distortions
frequency response variations of L,R,M or S output
signal over the frequency range 30Hz to 15KHz
relative to 500Hz:≤±0.15dB
Switchable deemphasis:
50μs±2%
alternatively(slide switch on printed circuit board):75μs±2%
Linear crosstalk
crosstalk between M and S channels:≥46dB(typ.50dB)
crosstalk between L and R channels:
at 100Hz to 5KHz:≥60dB(typ.64dB)
at 30Hz to 15KHz:≥58dB(typ.60dB)
Nonlinear distortions(L,R,M and S outputs)
Harmonic distortion at 6 and 12.5dBm:≤±0.1%
Difference-frequency intermodulation distortion according to DIN 45 403 at 12.5dBm:
d2:≤±0.05%
d3:≤±0.1%
weighted and unweighted noise(with 50-μs deemphasis)
unweighted signal-to-noise ratio relative to +6dBm
at 1000Hz,frequency range 30Hz to 100KHz,rms measurement:≥80dB
weighted signal-to-noise ratio relative to +6dBm,
peak-value measurement according to CCIR Recommendation 468-1:≥78dB
peak-value measurement according to DIN 45 405:≥80dB
Pilot-tone suppression relative to +6dBm:≥90dB
SCA suppression relative to +6dBm in frequency range 56 to 96KHz(SCA level-16dB relative tomultiplex signal):≥76dB
Indication on front-panel instrument
indication of L,R,M,S or pilot-tone level via selector switch
indicating error:≤0.2dB plus 1.5% of full scale value
pilot-tone indication:-7.5 to -17dB
AF indication(6 ranges in 10dB steps):+18 to -66dBm
