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Digital Impedance Meter 1685

Digital Impedance Meter 1685; General Radio (ID = 1715215) Equipment Digital Impedance Meter 1685; General Radio (ID = 1715217) Equipment
Digital Impedance Meter 1685; General Radio (ID = 1715218) Equipment Digital Impedance Meter 1685; General Radio (ID = 1715219) Equipment
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Digital Impedance Meter 1685; General Radio (ID = 1715215) Equipment
General Radio: Digital Impedance Meter 1685 [Equipment] ID = 1715215 933x294
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For model Digital Impedance Meter 1685, General Radio Company; Cambridge (MA)
Country:  United States of America (USA)
Manufacturer / Brand:  General Radio Company; Cambridge (MA)
alternative name
Year: 1975 ? Category: Service- or Lab Equipment
Semiconductors (the count is only for transistors) Semiconductors present.
Wave bands - without
Power type and voltage Alternating Current supply (AC) / 90-127;180-253 at 48-440Hz Volt
Loudspeaker - - No sound reproduction output.
Power out
from Model: Digital Impedance Meter 1685 - General Radio Company;
Material Metal case
Shape Tablemodel, low profile (big size).
Dimensions (WHD) 432 x 142 x 413 mm / 17 x 5.6 x 16.3 inch

The 1685 Digital Impedance Meter is an all solid-state instrument that automatically measures series capacitance and inductance at two frequencies, 120Hz and 1 kHz, and measures resistance at DC. These measurements can be made on command or repetitively, with measurement time variable between 0.25 s and 10 s , with results furnished by means of a digital readout display.

The basic accuracy is 0.1% +2 counts for DC and 1 kHz measurements and 0.5% + 1 count for 120 Hz measurements. For DC and 1 kHz measurements, the full-scale digital readout indication is 19999; for 120 Hz operation it is 1999.

The decimal points and units are also displayed; the units are displayed on the RANGE switch dial. The range is manually set.

The meter measures capacitance from .01 pF (one digit) to 20,000 µF, inductance from .01 µH to 2,000 H and resistance from 0.1 mΩ to 20 MΩ.

For ac measurements, the dissipation factor, D, or quality factor, Q, is also indicated. The value of D or Q is obtained by a manual dial adjustment. However, if this dial is set to the desired D or Q limit, there is an automatic indication if their value is exceeded. An optional limit Comparator (High/Low) can be added to the instrument.

Net weight (2.2 lb = 1 kg) 10.2 kg / 22 lb 7.5 oz (22.467 lb)
Mentioned in - - Manufacturers Literature

Model page created by Antonio Marra. See "Data change" for further contributors.

All listed radios etc. from General Radio Company; Cambridge (MA)
Here you find 216 models, 197 with images and 84 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.