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Dual Channel Differential Electrometer
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- High input impedance (10^15 ohm)
- Differential (A-B) output
- Low noise and wide bandwidth
- Electrode resistance test circuitry
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| Description |
Details
The FD223a is a dual differential, high impedance amplifier/electrometer designed specifically for electrochemical measurements using ion specific (K+, Na+, C1-, etc.) or pH electrodes. The instrument is very stable, drift free, and features a built in provision for measuring and adjusting input leakage current. DC levels may be independently adjusted for each probe channel.
Overcoming noise
The ability to locate the sensing probes directly at the measurement site overcomes the noise introduced by the long cables usually needed to bring the measured potential to the instrument. Signal-driven guards at the probe input maintains the specified high resistance and reduces the stray capacitance of the probes. Careful design, coupled with quality component selection, particularly in the headstage, results in an excellent amplifier with low noise and wide bandwidth. The FD223a will faithfully reproduce the measured signal. To reduce the noise and stray capacity even farther the probe housing includes a signal driven guard. A portion of this inner driven shell is exposed at the probe tip allowing a spring shield to be extended over the electrode holder and microelectrode.
Probe test port
The amplifier features a probe test port that permits testing of the electrode test feature and setting of the probe leakage current, (IG). A standby mode is included and should be used when attaching glass microelectrodes or electrode holders to the probe input. While in the standby mode the voltage at the probe input is clamped near zero volts thus protecting the input. |
| Specifications |
| Input Impedance |
> 1015 MΩ, shunted by 0.5 pF |
| Input Capacitance |
1 pF, nominal |
| Leakage Current |
75 fA max |
| Gain |
1.000 ± 0.1% |
| Output Resistance |
50 MΩ |
| Input Swing Voltage |
±10 V |
| Rise Time (10 to 90%) |
5 ?s, small signal |
| Noise (0.1 Hz to 10 kHz) |
<100 ?V p-p, input shorted |
| Baseline Stability |
±0.1 mV/day |
| Position Controls Range |
±600 mV |
| Physical Dimensions |
Case:8.8 x 21.0 x 17.5 cm (H x W x D) Probe:12.7 x 65 mm (D x L), 1.8 m cable |
| Power |
90-265 VAC, 50/60 Hz, 10 VA |
| Probe Handle |
6.5 x 65 mm (D x L) |
| Shipping Weight |
2.5 kg |
| Operating Conditions |
Equipment is intended to be operated in a controlled laboratory environment. Temperature: 0-40 °C; altitude:sea level to 2000 m; relative humidity: 0-95%. |
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| Manuals and Resources |
Additional information not available |
| References |
Have you seen a reference to this product in a published paper? If so, email your contact information and the citation and we will send you a free gift! |
| Ordering Information |
To place an order for this product, please contact the appropriate WPI office or distributor.
Customers can order direct from our China office:
WPI China
Address: Rm.20A, No.8 Dong Fang Rd, Liang Feng Building, Lu Jia Zui Financial District, Shanghai PRC
Phone:+86 21 68885517
Fax:+86 21 68885537
Code:200120
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| Accessories |
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| Application Notes |
Application Notes
No Application Notes available for this product at this time. |
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