Model 89 3/4 inch rectangular multiturn Cermet trimming potentiometer
This document details the Model 89 series of rectangular multiturn cermet trimming potentiometers. It lists the standard resistance ranges, tolerances, power rating, and electrical limits such as maximum input voltage and slider current.
Additional sections cover environmental ratings (temperature range, thermal shock, moisture resistance, shock and vibration), mechanical characteristics (torque, weight, mechanical stops), dimensions, pin layout, and ordering information for the various model variants (89P, 89W, 89X, etc.).
| Resistance Range | 10 Ω to 2 MΩ |
|---|---|
| Resistance Tolerance | +10 % (‑100 Ω = +20 %) |
| Maximum Input Voltage | 200 VDC or RMS (not to exceed power rating) |
| Maximum Slider Current | 100 mA (or within rated power, whichever is less) |
| Power Rating | 0.75 W at 85 °C, derating to 0 W at 125 °C |
| Operating Temperature Range | ‑55 °C to +125 °C |
| Temperature Coefficient (max) | +100 ppm/°C |
The maximum input voltage is 200 VDC or RMS, provided it does not exceed the power rating.
The standard resistance tolerance is +10 %, and for values below 100 Ω it is +20 %.
It can operate from –55 °C up to +125 °C.
The power rating is 0.75 W at 85 °C, derating to zero at 125 °C.