Connection To The 1433 Decade Resistor - IET Labs, Inc. RLC Digibridge 1693 User And Service Manual

3.2.15 Connection to the 1433
Decade Resistor
Note: The procedure for connecting the HARS-X
High-Accuracy Resistance Substituter is exactly the
same.
Connection to the 1433 or HARS Decade Resistors
can be accomplished using the 1657-9600 Extender
cables or 7000-04 Alligator Clip Leads.
The connection via the 7000-04 cable is shown in
Figure 3-26. When using 7000-04 Alligator Clip
Leads the alligator clips should be removed. The
simplest connection is a two-terminal measurement
on the 1433/HARS with ground strap connected be-
tween LOW and GND. But to minimize the noise
from the resistor decade, a three-terminal connection
might be preferable. The three-terminal connection
may be implemented by removing the ground strap
and attaching a separate lead between GND and
Digibridge chassis ground.
R L C
20.000
uF nF pF
I P
L L
IH PH
IL
PL
Operation
1693 RLC DigiBridge
G Z Y Q D R X B
.0002
mH H uS mS S DEG PPM
k
P I
H H
formerly made by GenRad
0 0
1 MΩ STEPS 100 kΩ STEPS
Figure 3-26: Connection to 1433 via 7000-04 cable
The connection via the 1657-9600 Extender Cable is
shown in Figure 3-27. It is for a three-terminal mea-
surement on the 1433/HARS with ground strap not
connected between LOW and GND. The green guard
lead is used in this measurement to minimize noise.
Open and Short compensation should be performed
as described. Set the Digibridge to the required fre-
quency. Open compensation should be performed
as normal with the red pair and black pair separated
by at least 6 inches. Short compensation should be
performed as follows:
1. Connect the cables to the 1433/HARS as
shown.
2. Set the 1433/HARS to zero ohms.
3. Perform short on the Digibridge.
TM
ANG
CONST I.
CONST V.
RANGE HELD
NOT 1kHz
RATIO
On
R/Q L/Q
POWER
Off
1433-33 10 MΩ DECADE RESISTOR
0 0
10 kΩ STEPS 1 kΩ STEPS
1693 RLC Digibridge
EXTERNAL
BIAS
BIAS
On
ON
Off
GO
NO GO
START
REMOTE
C/D C/R CONTROL
SER PAR
0 0
100 Ω STEPS 10 Ω STEPS
0
1 Ω STEPS
31