MEATEST, s.r.o.
M-142 Multifunction Calibrator
User Manual v54
107
Basic connection of a powermeter to the calibrator
Possible methods of grounding of the measurement circuit
To prevent the creation of ground loops and to ensure the guaranteed precision of the calibrator, the powermeter
to be calibrated as well as the calibrator must be properly grounded.
Depending on the nature of the measurement instrument to be calibrated, the following situations can occur:
Device under test
GND U
GND I
U input floating
I input floating
U and I inputs galvanically
disconnected, not grounded
ON
ON
U input floating
I input floating
galvanically connected terminals L
both U and I inputs, not grounded
ON
(OFF)
OFF
(ON)
voltage input grounded
current input floating
OFF
ON
voltage input floating
current input grounded
ON
OFF
both voltage and current inputs
grounded
OFF
OFF
Tab. 18 Recommended way of signal terminal grounding
ATTENTION
The voltage between calibrator’s –I and Lo outputs must not exceed 10 V.
HU LU HI LI
LI-I
