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General Information
Safety Symbols and Terms
1
1-3
CAUTION
The heading used in this manual explains hazards that could damage the instrument.
Such damage may invalidate the warranty.
1.5 Manual Addenda
Any improvements or changes concerning the instrument or manual will be explained in an addendum
included with the manual. Be sure to note these changes and incorporate them into the manual.
1.6 Specifications
Charge Measurements
Range, Resolution and Repeatability:
Full Scale Range Display Resolution
Repeatability (±
counts)
200.00 pC 0.01 pC 5
2.0000 nC 0.0001 nC 1.5
20.000 nC 0.001 nC 2.5
200.00 nC 0.01 nC 1
2.0000 μC 0.0001 μC
1
20.000 μC 0.001 μC
1
200.00 μC 0.01 μC
1
2.0000 mC 0.0001 mC 1
20.000 mC 0.001 mC 1
Measurement Method: Charge flowing into the input is integrated using a capacitive feedback
electrometer whose output is measured by means of a 20 bit bipolar A-D converter. A high-speed reset
circuit removes the integrated charge on the feedback capacitor each time it reaches a level of 2 nC in
either polarity. By monitoring both the number of 2 nC resets and the charge on the feedback capacitor,
the total charge flowing into the input is determined.
Factory Calibration: Basic factory charge calibration is performed by injecting -1.90 nC and
± 19.0 nC via
a precision standard air capacitor. This method is believed to provide a calibration accuracy of
±
0.05%rdg (± 0.05% of reading) as detailed in the table below:
Factory Calibration Error Source ± (%rdg)
Charge Source Accuracy (Capacitor) 0.01
Charge Source Accuracy (Voltage Change) 0.01
Temperature Effects (21°C – 25°C) 0.02
Other 0.01
Maximum Error 0.05
The field adjustable current and charge scale factors are set to their nominal value of 1.000 during factory
recalibration.