Demonstration instrument for lossless measurement of DC and AC voltages. Due to the high insulation resistance (approx. 1014 ©), the instrument loads the voltage source insignificantly. At the same time, the voltage drop becomes negligible. The measuring systems are protected against disturbing fields and placed in plastic apparatus housings. The measurement can be studied from the back through a window. The large and clear scale and the design of the pointer make the instrument very easy to read even at longer distances. The scaling of the scale enables precision reading. Scale is also available on the back. The pointer is visible through a slit in the scale. Mechanical zero adjustment with thumbwheel. Protected against overload by flashing over spark gap. Connection with banana connectors to high voltage insulator and two sockets for ground connection on the top of the instrument. Used in electrostatic tests, often together with power supplies 765-1325 or eg for examination of the charge density on Faraday cages, conductors etc.

• Made of soft wood. 35 × 10 cm

Model 765-1296: DC voltage, kV 1-7.5; Alternating voltage, kV 1-7.5; Inaccuracy class 1.5; Limit frequency 1 MHz ( 3.5 kV) 100 kHz ( 3.5 kV); Insulation resistance, ohm 1014; Time constant, hour 1; My flash voltage, kV 12; Capacitance pF 30

Model 765-1297: DC voltage, kV 3-26; Alternating voltage, kV 3-18; Inaccuracy class 1.5; Cut-off frequency 100 MHz; Insulation resistance, ohm 1014; Time constant, hour 1; My flash voltage, kV 30; Capacitance pF 26