IET Labs, Inc. RLC Digibridge 1693, User And Service Manual, Page: 22 / 171

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1693 RLC Digibridge
Abbreviated Specifications
Condensed operating instructions
1. General Information
The 1693 RLC Digibridge is a microprocessor-
controlled, automatic RLC meter.
Measurement parameters: R/Q, L/Q, C/D (series
or parallel), R/X (series), G/B (parallel), Z/Angle or
Y/Angle
Ranges:
Parameter Direct Reading Range Ratio and DQ in PPM
R and [Z]
0.00001 Ω to 99999 kΩ 0.00010 Ω to 9999.9
GΩ
L
0.00001 mH to 99999 H 0.00010 nH to 9999.9
MH
C 0.00001 pF to 99999 µF 0.00010 aF to 9999.9 F
Test frequencies: Over 500 selectable test
frequencies ranging from 12 Hz to 200 kHz
Applied voltage: 5 mV to 1.275 V (programmable
in 5 mV steps)
Measurement speed: Up to 19 measurements per
second
Bias: Internal: 2.0 Vdc; External: 60 Vdc max
Accuracy: Basic RLCGZY:
±0.02%
Sense + Sense -
Drive + Drive -
Match spacing of
DUT terminals
DUT
+ -
Sense +
Sense -
Drive +
Drive -
Open
Connection
Short
Connection
2. Starting-up
a. If the Digibridge includes an optional IEEE-488 interface,
set [ TALK] switch (rear panel) to TALK ONLY (unless
instructions are to be received through the IEEE-488 bus).
b. Make sure the [ EXTERNAL BIAS] is in the OFF posi-
tion.
c. Press the [ POWER] button.
The unit runs a brief self-check on start-up.
d. Wait until keyboard lights indicate
MEASURE
,
VALUE
,
SLOW , TRIGGERED , SERIES .
If a fault is detected, measurements are blocked and an er-
ror code remains displayed. See manual, paragraph 3.13.
If keyboard lights remain dark, keyboard is locked. To
unlock it, see manual paragraph 3.9.
To switch power off, press the [
POWER]
button.
3. Obtaining optimal accuracy by zeroing
Before making measurements, zero the Digibridge as fol-
lows: (Note: For best accuracy, repeat this procedure every
day, after each change of frequency, and after any change
of test-fixture adaptors.)
a. Attach extender cables or whichever test fixture/adapter is
appropriate.
b. Create an open circuit by having the spacing b
and - cable ends match the spacing of the DUT terminals.
See the figure.
If the spacing of DUT terminals is unknown, make sure
that the + and – ends of the cable are at least 0.75” (19
mm) apart.
c. Confirm that MEASURE keyboard light is lit.
d. Press [ MEASURE MODE] key to select TRIGGERED
mode
e. Press the following keys: [1] [6] [9] [3] [=] [SHIFT]
[OPEN] .
f. Press [START] and wait for the green GO light.
g. Create a short circuit across test terminals by connecting all
cable ends together as shown in the figure.
h. Press the following keys:
[1] [6] [9] [3] [=] [SHIFT]
[SHORT] .
i. Press
[START]
and wait for the green
GO
light.
At this point, the unit should be ready for taking measure-
ments. If something goes wrong during the zeroing process,
the procedure should be repeated.