Description
Retiring a legacy test system raises one question for each module: what replaces it? For the Keysight 60507B load module, Keysight names the N3305A. Until that move happens, the 60507B can stay in a 6050A or 6051A mainframe, and Lost in HCM lists it for rental and sale.

Reading the 60507B limits
The module accepts up to 150 V and 60 A, and it sinks up to 500 W. It occupies two slots in the mainframe. Because Keysight lists the model as obsolete, supply follows used inventory and a parts review. Therefore, ask early about condition and timing.
Control and protection on the Keysight 60507B load module
A test program can drive the load from the mainframe and read measurements back. In constant-current mode, an analog voltage input sets the current from outside. Five protections then watch the load. They cover overcurrent, overvoltage, overpower, overtemperature and reverse polarity.
Planning a program migration
A move to the N3305A touches more than hardware. Compare voltage, current, power and slot use first. Then check how your test code calls the load, because a new platform may need changes. Finally, confirm parts availability for any module you keep. As a result, you avoid surprises late in the project. Ask Lost in HCM what it can supply for each route.
Typical users
Maintenance teams keep legacy automated test equipment running with modules like this one. Engineers also use it to verify DC power supplies and converters, because the load can be programmed and read back. Meanwhile, labs use it to characterize batteries and power components. Each group usually asks for the same thing: a module that behaves like the one it replaces.
Rent now, decide later
A short rental of the Keysight 60507B load module lets you keep a rack alive while you plan the migration. Buying makes sense when the rack will run for years. In both cases, request a quote from Lost in HCM and state your mainframe, delivery site and schedule. You can also compare DC electronic loads, read the Keysight website, or contact SMK Vietnam.
60507B questions
What replaces the 60507B?
Keysight names the N3305A as the recommended replacement.
Can it run without a mainframe?
No. It is a module for 6050A and 6051A mainframes and takes two slots.
Which modes can I program?
Constant current, constant voltage and constant resistance.
















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