01483 302 700


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The unit combines in one compact assembly the insulation resistance and low current measurement functions. Its use has been simplified by the use of a liquid crystal graphic display (LCD) and a keypad.

The M1501P unit is fully programmable by IEEE 488 bus .

The M1501M model is identical to the M1501P except for the IEEE488 bus.

The M1501U model is showing reduced specifications.

The insulation resistance measurement is made with DC voltages from 1 volt to 1500 volts. (from 10 to 1500 VDC for the M1501U) The measurement range goes from 100 (resolution ) to 2020 TΩ 

( 5 kΩ to 20TΩ for the M1501U) .

The low current measurement is made either by using the internal DC voltage or by using an external source.

The current measurement range goes from 0.01 pA (resolution ) to 20 mA. (50pA to 20 mA for the M1501U).

The test parameters can be stored in 10 memories in Teraohmmeter mode as well as in Picoammeter mode .

Model Resistance range DC voltage Picoammeter  Interface 
Megohmmeter M1501P   
100Ω -2000TΩ

1-1500 (1V steps)

option up to
70 kV DC

0,01pA-20mA  GPIB included RS232, PLC,
0-10V analog output
in option
Megohmmeter M1501M 1kΩ -2000TΩ

1-1500 (1V steps)

option up to 
70 kV DC

0,01pA-20mA RS232 in option
Megohmmeter M1501U 5kΩ -20TΩ 10-1500 (10V steps) 50pA-3mA  No


Caltest Instruments Ltd

4 Riverside Business Centre

Walnut Tree Close


Surrey GU1 4UG

United Kingdom

Tel: +44 (0) 1483 302 700

Fax: +44 (0) 1483 300 562

Email: sales@caltest.co.uk

Caltest have been providing power sources and test instrumentation solutions for over 17 years and are proud to represent a number of industry leading manufacturers.