HINTS AND TIPS

Q. How can I make high current or voltage measurements using HP4155/56 and UTMOST?

A. The HP4155/56 DC Analyzer can be configured with SMU and Pulse Generator expander box frame called HP41501A. The expander box can have different measurement unit options. The option unit for the expander box include GNDU (GrouND Unit), PGU (Pulse Generator Unit), MPSMU (Mid Power Source Monitoring Unit) and HPSMU (High Power Source Monitoring Unit).

Figure 1. UTMOST SMU configuration screen for
high current Bipolar device measurement.

In order to measure a device with currents higher than 100mA, the expander box with HPSMU and GNDU unit is required. The Power limit of the HPSMU is 20W (up to 200V or 1A) The Mid Power SMUs which are part of the main 4155/56 frame have power limit of 2W (up to 100V or 100mA). The HPSMU and GNDU units have both force and sense terminals. The GNDU unit can sink currents up to 1A and must be used with HPSMU for high current measurements.

In order to measure a bipolar device with collector current greater than 100mA the following hardware configuration is needed:

HPSMU Force connect to COLLECTOR

HPSMU Sense connect to COLLECTOR (optional)

MPSMU connect to BASE

GNDU Force connect to EMITTER

GNDU Sense connect to EMITTER

UTMOST SMU configuration screen supports the expander box unit configurations. The HP4155/56 main frame contains 4 MPSMUs therefore the 5th SMU is the HPSMU. The selection of "0" in the SMU configuration screen corresponds to "unused SMU". Figure 1 demonstrates the UTMOST SMU configuration for the high current bipolar device measurement.

Q. How can I make high current or voltage measurements using HP4155/56 and UTMOST?

A. The HP4155/56 DC Analyzer can be configured with SMU and Pulse Generator expander box frame called HP41501A. The expander box can have different measurement unit options. The option unit for the expander box include GNDU (GrouND Unit), PGU (Pulse Generator Unit), MPSMU (Mid Power Source Monitoring Unit) and HPSMU (High Power Source Monitoring Unit).

Figure 1. UTMOST SMU configuration screen for
high current Bipolar device measurement.

 

In order to measure a device with currents higher than 100mA, the expander box with HPSMU and GNDU unit is required. The Power limit of the HPSMU is 20W (up to 200V or 1A) The Mid Power SMUs which are part of the main 4155/56 frame have power limit of 2W (up to 100V or 100mA). The HPSMU and GNDU units have both force and sense terminals. The GNDU unit can sink currents up to 1A and must be used with HPSMU for high current measurements.

In order to measure a bipolar device with collector current greater than 100mA the following hardware configuration is needed:

HPSMU Force connect to COLLECTOR

HPSMU Sense connect to COLLECTOR (optional)

MPSMU connect to BASE

GNDU Force connect to EMITTER

GNDU Sense connect to EMITTER

UTMOST SMU configuration screen supports the expander box unit configurations. The HP4155/56 main frame contains 4 MPSMUs therefore the 5th SMU is the HPSMU. The selection of "0" in the SMU configuration screen corresponds to "unused SMU". Figure 1 demonstrates the UTMOST SMU configuration for the high current bipolar device measurement.

Q. Is it possible to make pulsed measurements using HP4155/56 and UTMOST?

A. Yes, each SMU in 4155/56 can be used as Voltage or Current pulse source. (MPSMUs and HPSMUs). There can be only one SMU pulsed for a given configuration. In order to pulse a SMU the Stimulus Mode of HP4155/56 in the Hardware Configuration screen should be set to "Pulse 1". The selection of which SMU to pulse and type of pulsing (VPULSE or IPULSE) is made in the "Pulse Setup" screen for each routine (Figure 1) The "Pulse Setup" button is located in the Measurement Setup Screen of each routine.


Figure 1. Pulse Setup Screen for HP4155/56.