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measures the input signal. The “reference” and “reference zero” phases are associated with a
precision voltage reference inside the SourceMeter. By measuring all three phases, zero drift
for the reading is reduced. A/D conversion time is programmable with 0.01 power line cycle
resolution.
When Auto-Zero is enabled, all three phases are measured each time the SourceMeter is
triggered. With Auto-Zero disabled, only the “signal” is measured. Hence, speed is increased at
the expense of long term drift.
Firmware overhead
This is the time associated with A/D communication, reading calibration, and other opera-
tions necessary to perform the SDM cycle. This time is not illustrated in the following timing
diagrams.
Timing diagrams
Case I: Auto-Zero enabled and measuring a single function
Trigger Latency:
225µsec max
Source Configuration:
50µsec max
A/D Conversion:
[NPLC Setting
×
(1/power line frequency)] + 185
Firmware Overhead:
1.8msec for Source V
2.15msec for Source I
Source On Time
≅
Source Configu Source Delay + (3
×
A/D Conversion) + Firm-
ware Overhead
Example:
Source Delay = 0µsec
NPLC Setting = 0.01 PLC
Power Line Frequency = 60Hz
Source On Time
≅
50µsec + 0 + [(3
×
0.01
×
1/60) + 185µsec] + 1.6msec
≅
2.9msec for Source V
≅
3.25msec for Source I
Trigger
Latency
Trigger
Delay
Trigger
Event
Source
On
Source On Time
Source
Off
Source
Configuration
Source
Delay
A/D
Conversion
(current signal
phase)
A/D
Conversion
(ref phase)
A/D
Conversion
(ref zero phase)
F
i
g
u
r
e A
-
1
Case I timing
diagram
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: ......