厂家: 德国罗德与施瓦茨 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

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