Keysight Technologies B1505A

Keysight B1505A User’s Guide, Edition 12 3-99
Accessories
N1274A On-Wafer Gate Charge Measurement
Adapter/Selector for 20 A/3 kV
The N1274A is an adapter to enable on-wafer gate charge measurements using the
HCSMU (max. 20 A) and HVSMU (max. 3 kV). This equips an internal selector to
automatically switch signal paths of I-V measurement and gate charge
measurement. The N1274A is used with the N1258A module selector.
To perform the gate charge measurement, a current control device or a load resistor
must be mounted on this adapter.
The current control device must be a 3-pin inline package device which is expected
to have the same characteristics as DUT. If the device is not available, use a load
resistor. The resistor must satisfy the following specifications.
Resistance = Vr/Ir (Vr: rated voltage, Ir: rated current)
Peak power  Vr × Ir × 1 ms
WARNING Install the N1274A in the shielding box equipped with the interlock circuit.
Installer le N1274A dans la boîte de protection équipée d'un circuit de
verrouillage.
Front Panel
1. Input from N1258A
a. Low Force and Sense input connectors
BNC connectors. For connecting two BNC cables (B1512-61741) from the
Low Force and Sense connectors of the N1258A. These BNC cables are
supplied with the N1274A.
1
a
b
c
2
a
b
c
d
e
High Sense
Low Sense
Gate Sense Force Sense
High
Input From N1258A
Low
Force
Relay Control Input
Low ForceHigh Force
Signal
Guard
Circuit
Common
Output
±3 k V Max
±3 k V Max±10 V Max
Signal
Circuit
Common
N1274A
On-Wafer Gate Charge Measurement Adapter / Selector