The TERA ohmmeter TOM 374 uses the voltage measuring method, whereas a a electro field meter is used as a measuring amplifier due to its high input resistance. Therefor high resistors up to 1014Ω can be measured with a measuring voltage of 100V and an accuracy of 5% directly against earth. Besides the connecting sockets are additional ground jacks to connect earthed measuring lines to eliminate measuring inaccuracies due to parasitary effects. To comply to standards (IEC, EN, DIN, VDE u.a.) the demanded measuring time can be adjusted by an internal timer.
The input impedancy of the device is > 1016Ω
Specifications:
Dimensions: 150mm x 150mm x 88mm (L x W x H)
Weight: Approx. 990g
Display:
Double spaced alphanumeric two digit display, display 100mm x 24mm
Serial pc interface:
Serial interface for device controlling and data output (9-pol. SUB-D connector)
Power supply:
Internal with storage battery 7,2V / 1300mAh (permanently supervised), operation time approx. 4h permanent operation with fully charged battery
external with mains adapter 12V DC / 500mA
Charge time: Max. 14h
Charging rate: Approx. 100 mA in battery operation
Self power-off:
Approx. 5min after end of measuring if no button pressed