ADL F700 Details

The Model F700 is a high accuracy resistance bridge designed specifically for resistance thermometry. Its unique AC bridge circuitry eliminates thermal EMF effects to provide you with fast, reliable measurements under a wide range of real operating conditions.

A special input guard circuit maintains accuracy by minimising the effect of probe or cable leakage to ground. The effect of cable and probe reactance is eliminated by an on-board quadrature servo allowing you typically to make measurements up to 100 metres from the PRT.

The differential capability allows the resistance of one PRT to be measured against another directly and provides the most accurate comparison calibration technique.

Features
		Accuracy: <±0.5ppm (±0.5 micro K over full range)
		Resolution: 0.25ppm (0.25 micro K over full range)
		Linearity: <±1 LSD (0.25 micro K over full range)
		Warm up time: < 30 seconds

Accuracy

F700A:	±1ppm of reading or 1 digit, whichever is the greater. Equivalent to 0.25mK @ unity ratio (0.01C) or 1mK over the full range
F700B:	±0.5ppm of reading or 1 digit, whichever is the greater. Equivalent to 0.25mK @ unity ratio (0.01C) or 0.5mK over the full range
	Temperature equivalents for 25.5ohm SPRT against a 25ohm standard @ 1mA
F700A:	±5ppm @ unity ratio, equivalent to 6mK up to 1064C
F700B:	±2.5ppm @ unity ratio, equivalent to 3mK up to 1064°C.
	Temperature equivalents for 0.25Ohm HTSPRT against a 1 Ohm standard @ 10mA.