18-27SM5 Signal MixerSM5 Signal MixerSM5 OverviewThe SM5 is a three-channel signal mixer. The relative contribution of the threeinputs to the final output can be adjusted using a variable gain for two of the inputs.In addition, the signal on the two adjustable channels can be inverted beforeaddition. The input signal range is ± 10 V for each channel, with the additionalcaveat that the amplified signal for each channel may not exceed ± 10 V withoutclipping. The range for the summed output is ± 10 V.PowerThe SM5 Signal Mixer is powered via the System 3 zBus (ZB1PS). No PCinterface is required.SM5 FeaturesThe SM5 Signal Mixer is a three-channel weighted summer with variable inputweighting and channel inverting. The SM5 is a zBus rack mounted device, throughwhich it receives power.InputsThree signals input channels (A, B, and C), with a range up to ±10 V peak, areaccessed through front panel BNC connectors. Input channels A and B are multipliedby a weighted, signed constant, K, before being added to the final output. Theweighting range for these two channels is adjustable from -20 dB to +20 dB (i.e.|K| = 0.1 to 10) using a GAIN knob on the front panel. The sign of K forchannels A and B can also be selected using front panel toggle switches, labeledINV-A and INV-B.If an input is not being used, it should be grounded by attaching a shorted BNCcable. This will prevent unwanted noise from being added to the output.
