These electrocardiographs were developed by a team led by Dr. C. Levkov. They are light and portable, and can be powered by either mains power supply or batteries. They have safety class II, CF type, according to IEC 601/1. The 3xx series can ensure real-time continuous recording. In standard mode, the 12 lead ECG is memorized for up to 7 seconds, analyzed, and then printed out in groups of 3 (limb) or 2 (precordial) leads. A full parameter table of all P, Q, R, S, T and ST parameters in all 12 leads is printed. Vectorcardiographic features available. Detection and clipping of pacemaker pulses is possible. Automatic recording of date/hour using a built-in electronic clock circuit. Tremor filter (30 Hz lowpass) available.
Specifications
| Parameter | Value |
| Sensitivity | 1 or 2 cm/mV |
| Bandwidth | 0.05 Hz - 100 Hz |
| Time constant | 3.2 s |
| A-D conversion | 400 Hz, 10 bit |
| Recorder | Thermal dot printer, 8 pts/mm vertical and 16 pts/mmm horizontal resolution |
| Paper | Thermosensitive, non-waxed, 60 mm ( ECG 322) or 110 mm (331) width |
| Dimensions | 340(W) x 310 (D) x 100 (H) mm |
| Weight | 5.7 kg |
