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1693 RLC Digibridge
5.4 Performance Verification
5.4.1 Overview
This procedure is recommended for verifying that
the Digibridge is performing normally. No other
check is generally necessary because this procedure
checks operation of nearly all of the circuitry. If the
Digibridge passes this performance verification, it
is safe to assume that the instrument is functional.
(However, to insure accuracy, refer to section 5.8,
Accuracy Verification.)
All tests are done at 1 kHz, 1 volt NOT CONSTANT,
and at SLOW measure rate so that basic bridge ac-
curacy is realized. The accuracy of each verification
is therefore ±0.02% plus the tolerance of the verifying
DUT, which is discussed below. Table 5-1 lists the
necessary resistors, capacitors, and inductors. The
most accurate ones available should be used; toler-
ances listed are the "best" commonly catalogued.
There are no calibrations and only one adjustment
that may be required; and the internal standards are
very stable. This procedure checks at least one point
on each of the four measurement ranges.
Value
Component
Resistance
Metal Film
49.9 Ω
Resistors
499 Ω
4.99 kΩ
49.9 kΩ
499 kΩ
Capacitance
10 µF
Metalized
Polyester
0.33 µF
Polystyrene
Capacitors
0.033 µF
0.0033 µF
Inductance
1 mH
Ferrite core
100 mH
Inductors
Table 5-1: Components needed for
performance verification
112
Suggested
Accuracy
IET Product
±0.1%
RS-201
±5%
CS-C-6-100pF-WC
±0.5%
±0.5%
±0.5%
±2%
LS-400A
5.4.2 Performance Verification
Procedure
1. After the line voltage switch has been set to
correspond to the input line voltage, connect
the line cord and switch the POWER ON.
The Digibridge then enters an automatic self-cheek
routine and displays a sequence of codes. If one of
these displays persists, a check failure has occurred
and further checks or measurements are inhibited.
(See paragraph 3.13.)
Normally, upon completion of the power-up self
cheek, the following preset or default conditions
are established, lighting a vertical line of indicators.
(However, if the keyboard is locked, the locked-in
conditions are re-established and most of the keyboard
indicators are dark.) Normal:
[FUNCTION] - MEASURE
[DISPLAY] - VALUE
IMEASURE RATE} - SLOW
IMEASURE MODE] - CONT*
[EQUIVALENT CIRCUIT] - SERIES
* NOTE: If interface option is installed, MEASURE
MODE will indicate TRIGGERED and display blank.
The main panel displays and indicators (RLC and
QDR) will normally come up with random, meaning-
less readings; ignore them.
2. If the keyboard is locked, and the MEASURE
indicator is lit, to unlock it, press [1][6][9][3]
[=][LOCK].
If you have the interface option, it is possible that
the FUNCTION is locked at ENTER. Then the use of
remote control signals is required either to unlock the
keyboard or to select the MEASURE function, which is a
prerequisite for unlocking from the keyboard.
Service and Maintenance
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