Dual Channel Differential Electrometer (HiZ-223)

Dual Channel Differential Electrometer (HiZ-223)

The HiZ-223 is a very high input impedance, dual channel electrometer designed for measurements with high resistance ion-selective microelectrodes.

  • 1015Ω Input Resistance
  • Designed for measurements with ion-selective microelectrodes
  • Probe Test Port
  • Standby mode protects input amplifiers
  • Driven Guard Shield reduces stray capacity and noise

Item# Description U.S. List Price Quantity
64-1650 (HiZ-223) Differential electrometer, dual
64-1651 (HiZP) Replacement probe
64-1658 (DG-1) Driven guard shield, 2 pack
64-0980 E Series Straight Body Electrode Holder; Pellet with 2 mm Jack, 1.0 mm Glass ID
64-0981 E Series Straight Body Electrode Holder; Pellet with 2 mm Jack, 1.2 mm Glass ID
64-0982 E Series Straight Body Electrode Holder; Pellet with 2 mm Jack, 1.5 mm Glass ID
64-0983 E Series Straight Body Electrode Holder; Pellet with 2 mm Jack, 2.0 mm Glass ID
460-7013 (BNC-6) BNC to BNC cable, 6 feet (Pomona)
460-7032 (BNC-2) BNC to BNC cable, 2 feet (Pomona)
64-0455 (PV-830) Power Line Conditioner
1000 VA, 120 VAC 60HZ
64-0456 (PV-830CE) Power Line Conditioner 1000 VA, 220 VAC 50/60HZ
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The amplifier features two small active headstages, allowing the first stage of amplification to take place at the electrode site. Shunt capacity is reduced and electrical interference, such as electrostatic noise and motion artifact common to this type of recording, are greatly minimized.Electrode holder

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.

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.


Input Resistance 1015 ohms
Input Capacitance 1.0 pF nominal
Input Leakage Current 75 fA max
Voltage Gain 1.000 ± 0.1%
Output Resistance 50 ohms
Input Voltage Swing ±10 V
Risetime 5 microseconds (10-90%, small signal)
Output Noise (input shorted) 100 microvolts peak-to-peak
(DC to 10kHz bandwidth)
Baseline Stability ±0.1 mV/day
Position Control Range ±600 mV
Power Requirements 90 to 265 VAC, 50/60 Hz, 10 VA
Physical Dimensions:
Case Size 8.8 x 21 x 17.5 cm (H x W x D)
Probe 12.7 mm x 6.5 cm (D x L) with 1.8 m cable length
Probe Handle 6.5 mm x 6.5 cm (D x L)
Shipping Weight 2.5 kg
Warranty Two years, parts & labor
HiZ-223 (121212).pdfHiZ-223 Manual