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1685: Difference between revisions
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The {{Title|General Radio 1685 Digital Impedance Meter}} was available in {{Catalog 1978}} only. | The {{Title|General Radio 1685 Digital Impedance Meter}} was available in {{Catalog 1978}} only. | ||
The Type 1685 is a combination digital and analog impedance measuring device. The CRL values are displayed by a five digit LED display while D and Q use an analog system. Capacitance and inductance are measured at two selectable frequencies, 120 Hz and 1 kHz while resistance is measured using | The Type 1685 is a combination digital and analog impedance measuring device. The CRL values are displayed by a five-digit LED display, while D and Q use an analog system. | ||
Capacitance and inductance are measured at two selectable frequencies, 120 Hz and 1 kHz, while resistance is measured using DC voltages. The 1685 uses an eight-position range switch for capacitance and inductance measurements and a ninth position for high resistance measurements. | |||
Above the range switch are illuminated arrows pointing to the range of greatest resolution. The analog DQ dial uses similar illuminated arrows guiding the user towards the null. | |||
The 1685 has a comparator for Go/No Go testing of components. Limits are set with five decade switches for low and high values and indicator lamps for the results. Also provided is an indicator for high D or low Q if these values exceed the DQ dial setting. The four connections to the unknown are provided a special connector at the rear of the instrument, a test fixture or special cable are required. The Type [[1685-P1]] is the recommended test fixture. | The 1685 has a comparator for Go/No Go testing of components. Limits are set with five decade switches for low and high values and indicator lamps for the results. Also provided is an indicator for high D or low Q if these values exceed the DQ dial setting. The four connections to the unknown are provided a special connector at the rear of the instrument, a test fixture or special cable are required. The Type [[1685-P1]] is the recommended test fixture. | ||