HP 5328B Universal Counter: Mini Repair
The HP 5328 series counters are a range of 0 to 100 MHz Universal counter from the 70’s. While fairly similar on the outside, internally the updated B model differs from the A model significantly. The HP 5328B’s build quality impresses still today - even for the front panel they didn’t use plastic back then. Its specs however don’t. The direct count measurement provides a resolution of up to 8 digits/s, far less than modern but much more expensive reciprocal counters (with an interpolator) achieve. In my configuration the counter features an 8 digit LED display. In contrast to most newer counters the HP 5328B has dedicated marker outputs (trigger outputs) for each channel on the front panel. ...