IET Labs, Inc. RLC Digibridge 1693, Руководство пользователя и обслуживания, Страница: 55 / 171

31
1693 RLC Digibridge
Operation
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.
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.
0 1
2
3
4
5
67
8
9
10
0 1
2
3
4
5
67
8
9
10
0 1
2
3
4
5
67
8
9
10
0 1
2
3
4
5
67
8
9
10
0 1
2
3
4
5
67
8
9
10
0 1
2
3
4
5
67
8
9
10
0 1
2
3
4
5
67
8
9
10
formerly made by GenRad 1433-33 10 MΩ DECADE RESISTOR
1 Ω STEPS 10 Ω STEPS 100 Ω STEPS 1 kΩ STEPS 10 kΩ STEPS 100 kΩ STEPS 1 MΩ STEPS
1693 RLC DigiBridge
TM
20.000 .0002
POWER
uF
I
L
P
H
P
L
I
H
mH pF nF H k S DEG
NOT 1kHz
RANGE HELD
CONST V.
PPM
START
NO GO
GO
BIAS
ON
EXTERNAL
BIAS
REMOTE
CONTROL
On
Off
SER
On
Off
CONST I.
RATIO
mS uS
R C L Y Z G R D Q ANG B X
R/Q C/R C/D L/Q
PAR
IH PH
IL
PL
IL
PL
PH IH
Figure 3-26: Connection to 1433 via 7000-04 cable