5 appendix, 1 technical data – Metrohm 791 VA Detector User Manual
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5.1 Technical data
5 Appendix
5.1 Technical
data
Measuring instrument
Measuring technique
Direct current amperometry
Polarization voltage U
pol
Range:
–1990
… 0 … +1990 mV
Resolution: 10
mV
Deviation:
± 1 % ± 1 mV
Current measurement
Measurement:
direct, not integrated
Sensitivity:
0.1, 0.5, 1, 5, 10, 50 nA
0.1, 0.5, 1, 5, 100, 10'000 μA
Deviation:
± 15 % for 0.1 nA … 5 nA
± 1.5 % for 10 nA … 0.1 μA
± 1.0 % for 0.5 … 100 μA
± 4.0 % for 10'000 μA
Time constants: ≈ 5.0 s for < 0.1 nA
≈ 0.6 s for 0.1 ... 0.5 nA
≈ 0.3 s for 0.5 ... 1 nA
≈ 0.1 s for 1 ... 5 nA
Damping Switchable
Time constant:
1.7 s
Compensation current I
comp
absolute
relative
Basic range:
–20 … 0 … +20 nA
Resolution: 0.02
nA
Multiplication: 5
Ч, 50 Ч
Range: –5.00
… 0 … +5.00· I
Resolution: 0.01· I
Potentiostat Input
resistance:
10
12
Ω (typ. value)
Input current:
< 5 pA (typ. value)
Zero-point drift:
20 μV/K (typ. value)
Output voltage:
± 10 V
Output current:
≤ 10 mA
Analog output
Signal U = f ( I )
1 V or 10 mV DC for the full current range I
Polarity Switchable
Max. load
< 5 mA
Input resistance at
connected instrument
> 2 kΩ
791 VA Detector
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