IET Labs, Inc. RLC Digibridge 1693, User And Service Manual, Page: 161 / 171

137
1693 RLC Digibridge
Service and Maintenance
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.
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+ : stack on P+
RED & WHITE,
P+
: resistor H
BLACK, I- : stack on P
-
BLACK & WHITE, P- : capacitor L , center
BLACK&GREEN, G : resistor G , capacitor H
side post, and capacitor
L side post
Also connect with a short jumper from resistor L to
capacitor H , center post.
7. Confirm or select measurement conditions
on the Digibridge thus:
DISPLAY VALUE
MEASURE RATE SLOW
EQUIVALENT CIRCUIT SERIES
FREQUENCY 100 Hz
MEASURE MODE CONT
HOLD RANGE AUTORANGE
PARAMETER C/D
EXIT BIAS OFF