SPH-VM-TEST and SPH-CM TEST Detector Evaluation Test Box.

Handy, versatile & plug-and-play simple.

Our SPH-VM-TEST and SPH-CM-TEST products make it incredibly easy to plug in a Pyro detector, drop in a filter or optic and begin making measurements ... like now!

The SPH-VM-TEST is designed for our SPH-10 and SPH-20 series Voltage Mode Detectors (and Molectron P1-50, 60 and 70 series). The SPH-CM-TEST is designed for our SPH-30 and SPH-40 series Current Mode Detectors (and Molectron P1-30 and P1-40 series).

Both products include 6 decades of selectable load and feedback resistors, which give you the ability to adjust the Voltage Responsivity (Rv) and Bandwidth (BW) of the detector. Our Test Boxes are 9V battery powered, enclosed in an EMI immune housing and include a standard ThorLabs SM1 (1.035-40) threaded front bezel which makes it easy to add windows, ND filters and Optical lenses.

What’s in the Test Box?

The basic schematic at the left shows both the SPH-40 Hybrid Detector (circled) and some of the Test Box circuit. As you can see the Test Box inlcudes batteries, 6 decades of chip resistors (Rext) and a feedback capacitor (Cf) for the SPH-CM version. In addition it includes an on/off switch, green power light and BNC output connector all in an shielded EMI enclosure.

If you buy our test box with one of our SPH series Pyroelectric Detectors, we’ll go ahead and plug the device into the PC board (with Pin 2 out). You simply have to mount the box and push the power button. If you selected a window we will have likely dropped it into the front bezel. So you’ll be ready to measure your source.

To select a different Rf or RL, simply move the blue jumper and place it across the desired resistor value. You will have changed both the Rv and BW of the circuit. For more detailed set up guidance see our Application Note 1003.