TEXES is a high resolution mid-infrared spectrograph acting as a visiting instrument at the NASA IRTF and Gemini
North telescopes. Switching from high (R=100,000) to medium resolution (R=15,000), the noise becomes detector
dominated due to charge cascades in the low-background detector. This is remedied by lowering the bias voltage across
the detector, a problem during observing runs as it requires manual adjustment within the electronics. To save telescope
time, a bias selector has been created to allow the bias voltage to be switched from the control room between four
options. The options were chosen based upon signal to noise vs. bias voltage testing.