Table of Contents
Advertisement
Clamp Circuit Module
When to use the PD1000-66505 Clamp Circuit Module
The Clamp Circuit Module limits the voltage applied to the oscilloscope probe
while the DUT is turned off. It also allows for greater accuracy when measuring
R
Using the Clamp Circuit Module
Remove the N2819A Differential Probe from the Gate Drive module and
Channel1 of the oscilloscope. Connect the N2873A Clamp Circuit Probe to the
Clamp Circuit Module and Channel 1 of the oscilloscope.
How the Clamp Circuit Works
Figure 10 below shows a simplified example clamp circuit. This circuit is placed in
parallel to the device being tested (the DUT is on the left-hand side of the clamp
circuit).
For example, assume the voltage threshold (V
Voltage to 8 V, then this circuit accurately measures up to 6 V. When the V
the DUT is below 6 V, the system accurately measures the voltage V
However, when V
V
OUT
V
= 8 V
CLAMP
8 V
Figure 10 Simplified Example Clamp Circuit Schematic
Keysight Double-Pulse Test Fixture Installation and Use Guide
(on).
DS
The maximum test voltage that may be applied to the Clamp
Circuit Module is 400 V. This for both IGBT and FET devices.
is above 6 V, then the system measures no more than 6 V.
DS
DUT
Threshold Voltage
V
TH
V
IN
) of Q1 is 2 volts. If the Clamp
TH
V+
I
L
Example Clamp Circuit
C1
V-
V
CLAMP
Double-Pulse Test Preparation
of
DS
.
CLAMP
Q1
Clamp Voltage
set by Software
33
Advertisement
Table of Contents
