- Selectable ratio
- Very low noise
- Single-ended inputs and outputs
- Matching devices with low source impedances to measuring instruments with medium to high input impedances
- High T superconductor impedance measurements
- Increasing sensitivity of Model 5113 Preamplifier
The model 1900 low-noise impedance matching transformer is a versatile device for matching sources with impedances in the range from less than 50 Ω to greater than 500 Ω to measuring instuments with high input impedance and offers two turns ratios of 1:100 or 1:1000. The frequency response depends on both the turns ratio and the source impedance, but under optimum conditions will be essentially flat from below 0.1 Hz to above 2 kHz.
The unit is supplied with a special low-noise double-screened coaxial cable fitted with two BNC plugs to connect its output to the following instrument.