Metrohm 746 VA Trace Analyzer - Manual (Page 567)

8 Technical data
746 VA Trace Analyzer / 747 VA Stand
8-6
8.2 747 VA Stand
Brief characterisation
Measuring stand for the 746 VA Trace Analyzer with potentiostat and measuring
amplifier.
With multi-mode electrode, rotating disk electrode (RDE) as option.
Tilt-back measuring arm, integrated drip pan.
Potentiostat
Output voltage (AE) ± 12 V
Output current (AE) mode ”fast”: ± 12 mA
mode ”slow”: ± 1.5 mA
Input impedance (RE) R ≥ 5·10 11 Ω
Input Offset Voltage (RE) ± 1 mV
Input Bias Current (RE) ± 2 pA
Noise mode ”fast”: typ. 500 pA
mode ”slow”: typ. 200 pA
Circuit for measurement of the noise:
82 nF 82 Ω
AE RE WE
Sweep voltage range ± 3 V
Voltage steps 2, 4, 6, 8, 10, 12 mV
(cyclic voltammetry: 1 ... 12 mV)
Sweep rate cyclic voltammetry: 0.1 mV/s ... 100 V/s
other meas. modes: 0.2 ... 240 mV/s
Pulse amplitudes AC1, AC2: 1 ... 35 mV
DP: –100 ... 100 mV
SQW: 1 ... 50 mV
Current measurement
Minimum current I
min
2.4 pA
Maximum current I
max
DC, CV: 1.5 mA
DP: 1.2 mA
SQW: 1.4 mA
AC1, AC2: 0.6 mA
Current drift I
drift
0.03 %/K
Integration times DC: 1 ... 64 ms
DP, SQW: 1 ... 32 ms
Measurement interval 0.05 ... 9.9 s