D Measurement Accuracy - IET Labs, Inc. RLC Digibridge 1693 User And Service Manual

5.8.6 D Measurement Accuracy

Verify D-measurement accuracy with the following
procedure. Dissipation-factor checks will be made
using series equivalent circuit, with corresponding
connections of resistance and capacitance standards.
This procedure follows after paragraph 5.8.5. (Thus,
test frequency = 1 kHz, test voltage = 1 V, measure
rate = SLOW, range held indicator is NOT lit, and
parameter L/Q is specified.)
1. Connect the 1657-9600 extender cable to
the Digibridge remote test fixture. Hand
tighten the screws, to provide ground (guard)
connection.
2. Connect the "high" leads (red and red/white)
together and separately connect the "low"
leads (black and black/white) together.
3. Press [FUNCTION] key to select ENTER
function.
4. To select 100 Hz, press [.][1][=][SHIFT]
[FREQUENCY].
5. Before measurement, zero the Digibridge
as follows:
A. Keep the "high" banana-plug stack sepa-
rated from the "LOW" stack.
B. Press [FUNCTION) key (if necessary) to
select MEASURE function .
C. Press [MEASURE MODE) key (if neces-
sary) to select TRIGGERED mode.
D. Press the following keys: [1][6][9][3][=]
[SHIFT][OPEN].
E. Confirm that the GO indicator is lit.
F. Keep hands and objects at least 10 cm
(4 in.) from test fixture.
G. Press the START button.
H. Wait for the GO indicator to be lit again.
The RLC display should be .00000 pF.
I. Connect the 2 banana-plug stacks together,
leave the guard (black/green) open.
J. Press the following keys: [1][6][9][3][=]
[SHIFT][SHORT].
K. Confirm that the GO indicator is lit.
L. Press the START button.
M. Wait for the GO indicator to be lit again.
The RLC display should be .00000 ohms.
N. Press the [MEASURE MODE] key to
select CONT.
Service and Maintenance
6. Using the extender cable and plain bus wire,
connect the decade Rand C standards in se-
ries, as DUT to the Digibridge, as shown in
Figure 5-13 and tabulated below.
Figure 5-13: Series connections of standards
for D accuracy checks
RED, I+:
RED & WHITE, P+:
BLACK, I- :
BLACK & WHITE, P- : capacitor L, center
BLACK&GREEN, G:
Also connect with a short jumper from resistor L to
capacitor H, center post.
7. Confirm or select measurement conditions
DISPLAY
on the Digibridge thus:
MEASURE RATE
EQUIVALENT CIRCUIT
FREQUENCY
MEASURE MODE
HOLD RANGE
PARAMETER
EXIT BIAS
1693 RLC Digibridge
stack on P+
resistor H
stack on P
-
resistor G, capacitor H
side post, and capacitor
L side post
VALUE
SLOW
SERIES
100 Hz
CONT
AUTORANGE
C/D
OFF
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