General Radio 1658 RLC Digibridge

General Radio 1658
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The GenRad 1658 Automatic RLC Digibridge gives you a level of flexibility and ease of use that make it ideal at incoming inspection, where you need to test a wide range of components quickly.

Instrument features include a simple but sophisticated programming keyboard for setting component test limits, enabling the operator to perform high throughput testing, sorting, and evaluation; a choice of continuous, average, or triggered measurement modes to meet all measurement applications; and simple GO/NO GO indicators, plus an easy readout of value or bin number results at the touch of a button.



  • 0.1% accuracy for R, L, and C
  • Automatic limit comparison and binning
  • Two test frequencies (1 kHz and 120 Hz)
  • IEEE bus/handler option
  • External DC bias capability
  • Full-digit, dual displays
  • Built-in Kelvin test fixture



Measurement Parameters and Modes:Series or parallel R and Q, series or parallel L and Q, series or parallel C and D.  Continuous-repetitive, single, or averaged (set of 10) measurements; start button initiates single or averaged measurements.   Keyboard selection of these and all measurement conditions.

Main Displays (3 selections):Value display is LED-type numerical readout with automatically positioned decimal points and illumination of units; five digits for RLC (99999) and simultaneously four digits for DQ (9999). Limits display shows comparator bin limits and nominal values.  Bin No. display shows the bin assignment of the measured device.

Measurement Rates:Approximately 2, 3, and 7 measurements/second.  Keyboard selections are: "slow, medium, fast."

Test Frequencies:Keyboard selection between 2.  Actual frequencies: 120.00 Hz and 1020.0 Hz.

Ranges:Automatic ranging for best accuracy; autorange can be inhibited by keyboard selection.  Three basic ranges of 2 decades each, for each parameter.  Automatic extensions to min and max, as tabulated.

RLC Range:
Parameter Minimum Low Extension Basic Ranges Maximum High Extension
R: 1 kHz 0.0001 ohms 2 ohms to 2MW 9.9999 M ohms
R: 120 Hz 0.0001 ohms 2 ohms to 2MW 99.999 M ohms
L: 1 kHz .00001 mH 0.2 mH to 200 H 999.99 H
L: 120 Hz 0.0001 mH 2 mH to 2000 H 9999.9 H
C: 1 kHz .00001 nF 0.2 nF to 200 µF 999.99 µF
C: 120 Hz 0.0001 nF 2 nF to 2000 µF 99999 µF
Q (with R)   .0001 to 9.999  
Q (with L)   00.01 to 999.9  
D (with C)   .0001 to 9.999  

Bias:Connector for external voltage source, on-off switch, and indicator for light.  Limit, 60 V (max).  External source requirements: ripple < 1 mV pk-pk, dynamic Z < 1W with currents of ± 50 mA pk (source and sink); external discharge circuit recommended.

Supplementary Display:Parameters, modes, over range and under range conditions, range held, bias on, and remote control.

Sorting:Limit comparator sorts vs a DQ limit and up to 8 pairs of RLC limits into 10 bins, conveniently defined by keyboard entries.  GO/NO GO is indicated, whether bin number of measured value is selected as main display.