The 11A32 and 11A34 amplifier plug-in units are virtually identical to one another except for the number of channels. The 11A32 is a dual-trace unit, and the 11A34 is a four-trace unit. The bandwidth of the 11A32 is slightly higher than that of the 11A34 in each of the four 11000 Series mainframes. Two built-in four-pole bandwidth limit filters (100 MHz and 20 MHz) may be activated to reduce unwanted high frequency noise at 24 dB/octave for each channel. Both coarse and fine deflection factors steps are fully calibrated. At 1 mV/div, the high resolution calibrated dc offset has a setability of 25 μν and a range of ± 1 V (equivalent to 16 bits), giving an effective screen height of 2000 div and permitting absolute dc measurement accuracies to ±0.4%.