Source-Measure Concepts
5-25
The guard test lead IR drop is compensated for by connecting GUARD SENSE as shown in
Figure 5-14B. Sensing allows the guard voltage to be sensed (measured) at the resistor network
for better guard voltage regulation. If the remotely sensed guard voltage is less than the output
voltage of the SourceMeter, the guard voltage will be increased until the sensed guard voltage
equals the output HI voltage.
Note that in order to ensure that ohms guard current (I
G
) in Figure 5-14 does not exceed
50mA, output voltage from the SourceMeter must not exceed 5V (50mA
×
100
Ω
= 5V).
NOTE
For 6-wire ohms guard measurements, configure the output-off state to the GUARD
mode. For details on the GUARD output-off state, see Section 12, “Output
configuration.”
6430
x1
I-Source V-Meter
In/Out LO
In/Out HI
REMOTE
PreAmp
V,
Ω
GUARD
(Ohms Guard)
Guard
Ohms Guard Selected
I
G
I
L
HI (In/Out)
Guard (Cable)
LO (In/Out)
R
TL
Test Lead Resistance
1
Ω
10k
Ω
100k
Ω
20k
Ω
20k
Ω
10k
Ω
100k
Ω
I
G
I
L
R
TL
1
Ω
V,
Ω
GUARD
(Ohms Guard)
HI (In/Out)
Guard (Cable)
LO (In/Out)
6430
x1
I-Source V-Meter
In/Out LO
In/Out HI
REMOTE
PreAmp
Guard
Ohms Guard Selected
GUARD SENSE
-
+
A. Local Guard Sense
B. Remote Guard Sense
IN/OUT HIGH
IN/OUT HIGH
R
2
R
3
R
1
R
2
R
3
R
1
Figure 5-14
In-circuit ohms
measurements
using guard sense
Содержание 6430
Страница 26: ......
Страница 32: ......
Страница 78: ...2 14 Connections ...
Страница 98: ...3 20 Basic Source Measure Operation ...
Страница 138: ...5 30 Source Measure Concepts ...
Страница 156: ...6 18 Range Digits Speed and Filters ...
Страница 168: ...7 12 Relative and Math ...
Страница 176: ...8 8 Data Store ...
Страница 202: ...9 26 Sweep Operation ...
Страница 248: ...11 22 Limit Testing ...
Страница 310: ...16 6 SCPI Signal Oriented Measurement Commands ...
Страница 418: ...17 108 SCPI Command Reference ...
Страница 450: ...18 32 Performance Verification ...
Страница 477: ...A Specifications ...
Страница 489: ...B StatusandErrorMessages ...
Страница 498: ...B 10 Status and Error Messages ...
Страница 499: ...C DataFlow ...
Страница 503: ...D IEEE 488BusOverview ...
Страница 518: ...D 16 IEEE 488 Bus Overview ...
Страница 519: ...E IEEE 488andSCPI ConformanceInformation ...
Страница 523: ...F MeasurementConsiderations ...
Страница 539: ...G GPIB488 1Protocol ...
Страница 557: ......