5" Dual Trace Oscilloscope 539D

BWD 539D 25MHz dual trace oscilloscope 

"Vertical deflection sensitivity is variable in 12 ranges from 5mV/cm to 20V/m. In addition, the vertical amplifiers can be cascaded to give a sensitivity of 0.5mV/cm at a bandwidth of 12Hz to 100kHz (-3dB). 

Twenty-one ranges (the manual says 19) in a 1-2-5 sequence are provided for the timebase, giving sweep rates from 0.5uS to 2sec/cm. A 5 to 1 vernier extends the sweep down to 10sec/cm. In addition, the horizontal trace position can be pulled out to provide five times magnification of the sweep signal. 

Vertical inputs can be either AC or DC coupled, or grounded. Input impedance is 1M shunted by 35pF. AC bandwidth is 2Hz to 25MHz -3dB points) referred to 4cm deflection at 50kHz, with useful response to 30MHz or beyond. These figures make the 539D suitable for service work on CB transceivers and amateur equipment working up to 30MHz. 

Front panel layout of the 539D is conventional and straightforward. All controls are legibly marked, and the unit is easy to drive. A well written manual accompanies the unit, and outlines a number of useful measurement techniques. 

Also included in the instruction manual are a frequency response chart and a nomograph for estimating the true rise time of waveforms as observed on the 539D. Another useful nomograph is shown for measuring phase angle using a Lissajous display. The frequency response chart gives approximate calibration correction to beyond 40MHz, thus extending the useful measuring range of the instrument. 

A range of accessories is available for the 539D. BWD list such items as probes, cameras, dust covers and a carrying case." (EA New Products, Dec. 1977, abridged)

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