Modules are removable cassettes that are placed in the slots of the rack. The SPI-rack has 12 (almost) identical slots (to be specific: they are divided in 4 supply/breakout groups of 3). Each module contains a specific function identified by the code. The modules are identified by a letter-number(-letter) code on the front.

The modules function can be determined by the first letter in the code: source (S–), measure (M–), controller (C–) etc. The second digit in the module code is a digit denoting a module category, and the third position (-) denotes a specific type within that category, usually a letter. For example: the S4g. The ’S’ denotes a source module, the ‘4’ indicates a current source and the ‘g’ a specific module type.

The tables below contain the modules that have been developed specifically for the SPI Rack. For the IVVI rack modules, see: The IVVI modules are compatible with the SPI Rack, provided that the B1 module is used. For more information, see IVVI Compatibility.


Module Info
C1 - Non-Isolated Controller PC directly connected to the SPI Rack.
C1b/C2 - Isolated controller PC connected to C2 which has a galvanically isolated connection with the C1b.

Current Source

Module Output Range Info
S4g - 4 Channel, 18-bit current source ±50 mA, ±25 mA, +50 mA Span adjustable in software.

Voltage Source

Module Output Range Info
D5a - 16 Channel, 18-bit DAC ±4V, ±2V, +4V, (±8V, +8V) Span adjustable in software. ±8V and 8V possible with extra power supply. Slow ramp down switch for emergencies.
S5k - 16 Channel AWG

Voltage Measurement

Voltage Measurement Input Range Info
D4 - 2 Channel, 24-bit ADC ±4V High resolution ADC module. Can be used as an alternative to a Keithley DMM.


Module Frequency Output Info
S5i - RF Generator 40 MHz - 4 GHz -14 to 20 dbm Outputs square wave, needs external filtering
F1d - IQ Demodulator RF/LO from 40 MHz to 1.4 GHz Adjustable 1/3/10 MHz IF output Adjustable output gain
F1e - IQ Demodulator RF/LO from 40 MHz to 1.4 GHz Adjustable 200 MHz / 500 MHz IF Output In development
M2j - Low Noise Amplifier 40 MHz to 4 GHz Variable gain from 40 to 70 dB Noise Figure of 1.3dB at maximum gain


Module Info
S5t - 10MHz Sync Trigger
B1a - IVVI Module Adapter Required for backwards compatibility with the IVVI Rack modules