Clipper Test Probe Operating Instructions
P/N CLP1500V15 1 V1.3 Page 2
Connect & Disconnect Properly:
The Clipper Test Pro e has an “IN” and an “OUT” connection. The “IN” is to
e connected across the Vds or the Vce of the DUT (Device Under Test).
The “OUT” terminal is to e connected to an Oscilloscope using a 10X
Pro e. Connections must only e made when the DUT is switched off, and
it is certain that no residual charge (eg in capacitors) remains. Further
instructions follow.
High Voltage Warning:
The Clipper Test Pro e is designed to measure max continuous voltages of
1500V DC. Do not apply any voltage to the pro e greater than the A solute
Maximum Rating (1700V). Before switching on the device under test, make
sure there is no part of the ody within 30cm of the test area. Do not leave
the test area switched on and left unattended, switch off immediately after
making the tests.
Negative Voltage Warning:
The Clipper Test Pro e is designed to “clip” positive voltages only. It can
withstand negative voltages not exceeding -5V. Any DC Voltage less than
this could permanently damage the device. Therefore it is essential to take
care when connecting the inner “Positive” terminal to the “Drain” or
“Collector” of the DUT.
Grounding and Isolation:
The Clipper is a passive test pro e, with no isolation etween IN and OUT.
Under normal conditions, no voltages a ove 15VDC appear on the output
terminals, ut e aware that under fault conditions it may e possi le to
have the IN voltages present on the OUT and the Pro e must e handled
with this consideration. ALWAYS keep a safe distance etween the DUT and
the IN / OUT terminals efore powering on the DUT. Under NO
circumstances touch the Clipper OUT terminal when the Test is live.
Clipper Test Probe Operating Instructions
P/N CLP1500V15 1 V1.3 Page 3
Environment:
The Clipper is designed for La oratory use only. Do not use in wet or
explosive atmosphere.
Cleaning:
Do not immerse the unit in water. Use a soft moist cloth to clean surfaces.
The pro e must e completely dry efore use
OPERATION
Functional Description:
The Clipper Test Pro e allows the measurement of low voltage signals
( elow 12V) in the presence of high voltages (up to 1500VDC). Without the
Clipper, the Oscilloscope must either ut switched into a high-range (say
100V/Div) with corresponding low resolution, or can e put into a low-
range (say 2V/DIv) with input uffer overload effects and offsets eing
generated y the overdriven Oscilloscope input amplifiers.
The Transfer function can e written as:
If Vin >= 2V (LO Range)
V(out) = 2V
Else
V(out) = V(in)
If Vin >= 12V (HI Range)
V(out) = 12V
Else
V(out) = V(in)
No signal conditioning of the input signal is performed. Measurement
accuracy of the input signal is >98%. Settling time is around 100nS.
