QuadTech 1657 RLC Digibridge, Instruction Manual

Page: 7 / 57

1.1 PURPOSE 1-1
1.2 GENERAL DESCRIPTION 1-1
1.3 CONTROLS, INDICATORS, AND CONNECTORS 1-1
1.4 ACCESSORIES 1-1
1.1 PURPOSE. in keeping with the long-life circuitry inside. Glass-epoxy
The 1657 Digibridge digital impedance meter embodies circuit boards interconnect and support high-quality com
use of a microprocessor and other LSI circuitry to ponents to assure years of dependability.
provide excellent performance at low cost. Adaptability to any common ac power line is assured by
A few clearly labeled pushbuttons and the versatile the removable power cord and the convenient line-voltage
built-in test fixture make this instrument a model for con- switch. Safety is enhanced by the fused, isolating power
venience. Measurement results are clearly shown with dec- transformer and the 3-wire power connection. A compre
imal points and units, which are automatically presented to hensive functional description is given in Theory, Section 4
assure correctness. Display resolution is 5 digits for R, C, Electrical and physical characteristics are listed in Specifi
and L (4 for D or Q) and the basic accuracy is 0.2%. cations at the front of this manual, dimensions in Installa
Long-term accuracy and reliability are assured by the tion, Section 2. Controls are described below, and their use
measurement system. It makes these accurate analog in Operation, Section 3.
measurements over many decades of impedance without a
single calibration or "trimming" adjustment (not even in 1.3 CONTROLS, INDICATORS, AND CONNECTORS.
original manufacture). .
The built-in test fixture, with a pair of plug-in adaptors, Figure :-1 shows the front panel conrols and indicators.
receives any common component part (axial-lead or radial- Table 1-1 identifies them with descriptions and functions.
lead) so easily that insertion of the DUT is a one-hand Similarily, Figure 1-2 shows the rear panel and Table 1-2 identifies
t
.
.
I
.
Identifies and describes the rear panel controls and connec
operation. True 4-terminal connections are made automat
.
ically. Extender cables and other accessories are available
and describes the rear panel controls and connectors.
for measurements at a distance from the Digibridge.
1.4 ACCESSORIES.
Gen Rad makes several accessories that enhance the use
1.2 GENERAL DESCRIPTION. fulness of this instrument. Two extender cables facilitate
Convenience is enhanced by the arrangement of test making connections to those devices and impedance stan
fixture on the front ledge, with push buttons farther for- dards that do not readily fit the built-in test fixture. A
ward and display behind. The display panel is inclined and remote test fixture (used with BNC adaptor and cable
recessed to enhance visbility of digital readouts and mode assembly) provides convenience and relatively easy main
indicators. These indicators serve to inform and guide the tenance, and saves wear on the built-in test fixture. All of
operator as he operates the simple controls. these test-fixture accessories provide for true 4-terminal
The instrument stands on a table or bench top. The connections (and guard) to the device being measured,
sturdy metal cabinet is attractively and durably finished, without appreciable reduction in measurement accuracy.
Other useful accessories are offered, such as standards for
checking the performance of the Digibridge. Refer to
Table 1 -3 and Section 5.
INTRODUCTION 1-1