Oscilloscope Probe Setup

Attach the probe connector to the appropriate oscilloscope channel.
Connect the probe to the appropriate DPT Test Module.

Oscilloscope Channel	Color	Measures	Oscilloscope Probe
1	Yellow	Low-Side Gate Voltage: V_GS,L/V_GE,L (LOW-SIDE V_GS/V_CE on Interface Module)	DP0031A Differential Probe¹ (requires banana to BNC adapter)
2	Green	Low-Side Output Current: I_D,L / I_C,L (LOW-SIDE ID/IC on Interface Module)²	PD1000-60002 Protection Probe and cable to Coaxial Shunt³
3	Blue	Low-Side Output Voltage: V_DS,L / V_CE,L (LOW-SIDE V_DS/V_CE on Interface Module)	DP0031A Differential Probe¹ (requires banana to BNC adapter)
4	Red	Low-Side Gate Current, I_G,L (I_G on Interface Module)	DP0001A High Voltage Differential Probe
5	Lt Blue	Optional. High-Side Output Voltage,V_DS,H / V_CE,H (Interface Module HIGH_SIDE V_DS/V_CE)	DP0001A High Voltage Differential Probe
6	Dark Red	Do not connect oscilloscope probe. See “Connect Probe for High-Side DUT Measurements” below and PD1550A Software User Guide.	Reserved for V_GS,H/V_GE,H from Isolated Probe Unit.
7	Purple	Do not connect oscilloscope probe. See “Connect Probe for High-Side DUT Measurements” below and PD1550A Software User Guide.	Reserved for I_D,H/I_C,H. See below and PD1550A Software USer Guide.
8	Orange	Not used. Reserved for future use.	Not used. Reserved for future use.

1. Your system may have been provided with PMK PD1802A Differential Probes instead of the Keysight DP0031 probes. These probes are identical in performance.

2. Replace this cable with only the same Keysight part number. The length and type of this cable is assumed for correct Deskew.

3. Use the 0.56 N-m (5 lb-in) 5/16 in. SMA Break-over torque wrench (provided with the PD1550A system) to tighten the SMA cable connector to the PD1000-60002 Protection Probe. Failure
to do so might cause extensive ringing in the DPT measurements. See appendix for details.

The oscilloscope channels and colors shown above are recommended. You may choose different channels. All examples and screen captures shown in the DPT documentation use this configuration. The colors on the PD1000A Control Software screen match the DSOS104 Oscilloscope probe channel number colors: i.e., Channel 1 - V_GS,L/V_GE,L for Low-Side Gate Current is yellow, Channel 2 - I_d,L/I_C,L for Low-Side Output Current is green, etc.

Do not use a different cable for I_DS,L or True Pulse oscilloscope probes. The cables and oscilloscope probes supplied with your PD1550A provide correct probe deskew.

-- Do not exceed maximum input voltage rating on oscilloscope.
-- The maximum input voltage for 50 W input impedance is ±5 V.
-- The maximum input voltage for 1 MW input impedance setting is 30 V_rms or ±40 V_max (DC + V_peak).
-- Probing technology allows for testing of higher voltages. No transient over voltage allowed.

When a probe, adapter, or cable is attached to the oscilloscope, the channel input circuits can be damaged by ESD. Avoid applying static discharges to anything connected to the oscilloscope. Ensure the oscilloscope is properly earth-grounded to prevent buildup of static charge. Wear a wrist strap or heel strap.

Loose cables can hold electrostatic charges. The free end of a cable touching a charged surface can cause oscilloscope input damage. Before connecting any cable to an oscilloscope input, short the center and outer conductors of the cable together to ground momentarily. Alternately, connect to a 50 W termination adapter to discharge the cables.

Connect Oscilloscope Probes to DUT Interface Module

Important: This section and the following photographs apply only to the standard 62 mm Interface Module supplied with the PD1550A system. Your custom Interface Module will be different and require different connections.

Oscilloscope probes connect to the Test Interface Module as follows:

Connect Probes for High-Side DUT Measurements

High-Side Gate Voltage

Keysight’s Isolated Probe Unit is used for High-Side Gate Voltage, V_GS,H / V_GE,H, measurements only. Only Channel A is used at this time, the remaining channels are reserved for future use. A standard 10:1 oscilloscope probe connects the Channel 1 to the Keysight Interface Module.

Make certain that both Gate Voltage V_GS,H/V_CE,H and Use Isolated Probe Unit for V_GS,H/V_CE,H are selected in the Settings > Hardware Configuration > Oscilloscope tab are checked. Default condition is that these two are not checked.

High-Side Drain/Collector Current

For High-Side Drain or Collector current, ID,H/IC,H, measurements, a current shunt is not available for the Keysight 62 mm Interface Modules. However, for your custom Interface Modules you may design a place to install a small Rogowski coil current probe. This should be connected to Channel 7 on the PD1550A oscilloscope.

Make certain that Output Current I_D,H/I_C,H is selected in the Settings > Hardware Configuration > Oscilloscope tab are checked. Default condition is that this is not checked.

The Link Port on the Keysight Isolated Probe Unit is not used. All LEDs next to individual channels should be green. There is also a green power LED and a red LED that indicates a trigger has occurred.