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CW503 Probe Power Supply

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The CW503 provides a handy power supply for both the differential probe and the LNA. Multiple probes can be connected to a single power supply. The following shows the internal block diagram of the CW503 probe power supply:


The use of isolated DC-DC converters allows you to use connected probes without worry about ground loops. Note the probe is not designed for use at high isolation voltages (>30V).

The power supply uses a micro-USB jack, allowing you to power the probe from front-pane USB ports on some instruments (be careful of current limits if using this method):


Alternatively the probe comes with a high-quality 5.0V wall-wart adapter, which has been selected for minimum noise input to the CW503.

Front-Panel Connections

The following can be found on the front panel of the device:

  • Power Good LEDs:

    The probe PSU monitors the +7.8V, -7.8V, and +3.3V outputs. If these outputs fall below the required setpoints the LEDs extinguish. This is normally due to excessive current draw or a short on one of the output lines.

  • 6-Pin Probe PSU Connectors:

    This probe supply connectors use the same pinout as our Low Noise Amplifier (CW502) and Differential Probe (CW501). The pinout is as follows:

    Pin Name
    1 +7.8V Out
    2 GND
    3 Aux Out
    4 +3.3V Out
    5 -7.8V Out
    6 GND
  • PROBE-GND Pin Header:

    This pin header connects to the GND pins on the 6-pin connector.

  • AUX-IN Pin Header:

    This pin header connects to the "Aux Out" pin on the 6-pin connector.

  • USB-GND Pin Header:

    This pin header connects to the USB negative (ground). You can connect this to the PROBE-GND to remove the isolation, or use a resistor if you want to reduce voltage differential without directly connecting them.