User Manual

2400 Series SourceMeter
®
User’s Manual Specifications A-5
Source On Time ≅ Source Configuration + Source Delay + (3 × A/D Conversion)
+ Firmware 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
Case II: Auto Zero enabled and measuring two functions
Figure A-2
Case II Timing Diagram
Trigger Latency: 225µsec max
Source Configuration: 50µsec max
A/D Conversion: [NPLC Setting × (1 / power line frequency)] + 185µsec
Firmware Overhead: 2.3msec for Source V
2.65msec for Source I
Source On Time ≅ Source Configuration + Source Delay + (4 × A/D Conversion)
+ Firmware Overhead
Example: Source Delay = 0µsec
NPLC Setting = 0.06 PLC
Power Line Frequency = 60Hz
Source On Time≅ 50µsec + 0 + [(4 × 0.06 × 1/60) + 185µsec] + 2.6msec
≅ 7.1msec for Source V
≅ 7.45msec for Source I
Trigger
Event
Source
On
Source On Time
Source
Off
Trigger
Delay
Trigger
Latency
Source
Configuration
Source
Delay
A/D
Conversion
(current signal
phase)
A/D
Conversion
(ref phase)
A/D
Conversion
(ref zero phase)
A/D
Conversion
(voltage signal
phase)