Instructions

11. Differential’, Common Mode’ and ‘Absolut max.’ Voltage
Range limit is the lesser of the ‘DC+Peak AC’ and RMS values.
Input voltage at positive input lead = V(+) / Input voltage at negative input lead = V(-)
- Differential Range= V(+) –V(-)
- Common Mode Range= [V(+) +V(-) ] /2
The input-specification of differential range and common mode range has to be meet
at the same time so that output specification could be meet. Absolute Max. Voltage is
defined for when the input condition do not meet specification of differential range and
common mode range. Under this condition, the output of probe could not be guaranteed
within specification. When larger then this condition, the probe maybe broken.
12. Derating Curve
The derating curve of the absolute maximum input voltage in common mode is shown as
follows.
13. Inspection Procedure
a. Connect the BNC output connector to the vertical input of a general purposed
oscilloscope.
b. Install four AA cells or connect an appropriate mains adaptor or power lead to the correct
line voltage.
c. Set the oscilloscope input coupling to DC and the 1V/div. Center the trace on the display.
d. Connect the inputs of the probe to power lines.
e. Set the range of the probe to 1/100.
f. Then, a 50Hz/60Hz sine-wave of proper amplitude will be displayed on the screen of the
oscilloscope and this means the probe is working properly.